citizen science

Bridging citizen science and expert surveys in urban biodiversity monitoring: Insights from insect diversity in Macao

Using insects as a model group, researchers examined the potential of citizen science to uncover undocumented biodiversity.

Guest blog post by Kaiyun Zheng, Mark K. L. Wong, Toby P. N. Tsang, Chi Man Leong

A photo of a cicada emerging from its shell, clinging to a branch among green leaves at night. — Eclosion of *Cryptotympana* sp. during a nighttime bioblitz activity in Macao. Photo courtesy Dr. Danny Chi Man Leong

During a field trip for an ecology course in a city park, lead author Ms Kaiyun Zheng was fascinated by the incredible insect biodiversity surrounding her. Insects serve as important bioindicators—their diversity and assemblage can reveal ecological processes and environmental health. However, sampling insect diversity is often challenging, requiring extensive equipment and field effort. Despite being one of the most species-rich animal groups, insects are undergoing a global decline due to habitat loss, pollution, and urbanization. Traditional insect surveys typically demand significant time and resources and are limited in scope.

Curious to find a more accessible approach, Kaiyun began exploring insect records from both expert-led field surveys and citizen science platforms such as iNaturalist. Together with her supervisor, Dr. Danny Chi Man Leong from Beijing Normal-Hong Kong Baptist University, and co-authors Dr. Mark Wong from The University of Western Australia and Dr. Toby Tsang from University of Toronto Scarborough, they posed a key question: Can citizen science reveal hidden biodiversity beyond what expert surveys have recorded?

A photo of a woman standing outdoors, wearing a white shirt and brown skirt, holding a phone and a hat, with a backpack slung over one shoulder. — Ms. Kaiyun Zheng

A photo of a man with arms crossed, wearing a dark green sweater over a collared shirt, and a watch, standing against a wooden background. — Ms. Kaiyun Zheng

Citizen science involves participation by people without formal scientific training, who contribute to scientific research by collecting and sharing data. In biodiversity documentation, citizen scientists can use smartphones and digital platforms to record species, helping expand scientific knowledge at scale.

Using insects as a model group, the authors examined the potential of citizen science to uncover undocumented biodiversity and discussed how large-scale citizen-contributed data could enhance ecosystem monitoring. To evaluate the strengths and complementarities of different data sources, they compared an expert dataset with a citizen science dataset.

Four panels depicting insect observation data: a map, trend graphs for observations, observers, and species over time. — Spatial distribution of insect observations in Macao from the citizen science dataset (iNaturalist.org) (A), along with cumulative increases in verified identifiers (B), insect observations (C), and recorded insect species (D).

In total, 1,889 insect species were recorded across both datasets, but only 462 species (24%) overlapped. The expert dataset included 1,339 species, of which 877 (65%) were not found in the citizen science records. Conversely, the citizen science dataset documented 1,012 species, with 550 (54%) unique to it. This substantial non-overlap indicates that the two approaches capture different facets of insect diversity. For example, there was relatively high overlap for insect groups such as butterflies and moths (Lepidoptera), likely due to their conspicuous appearance and popularity among observers. In contrast, groups such as wasps, bees and ants (Hymenoptera) and flies (Diptera) were underrepresented in the citizen science dataset, suggesting challenges in detecting smaller or more cryptic species.

Venn diagram showing species counts: 877 expert recorded, 550 citizen science recorded, and 462 shared species. — Venn diagram of insect diversity between expert and citizen science datasets.

These findings highlight the importance of integrating expert surveys with citizen science efforts to achieve a more comprehensive understanding of insect biodiversity, especially in urban areas which benefit from a high participation from citizen scientists.

Their study also highlights the unique strengths of citizen science for urban biodiversity monitoring. Residents living near parks and green spaces are ideally placed to document insect occurrences in real time across a wide range of locations. Notably, the study includes a citizen-contributed record of Mortonagrion hirosei, a Near Threatened damselfly rarely observed in Macao. This example illustrates how citizen science can detect rare or cryptic species, uncovering important biodiversity records and filling gaps left by traditional surveys, making it an indispensable tool for future biodiversity monitoring.

Research article:

Zheng K, Wong MKL, Tsang TPN, Leong CM (2025) Bridging Citizen Science and Expert Surveys in urban biodiversity monitoring: Insights from insect diversity in Macao. Biodiversity Data Journal 13: e153402. https://doi.org/10.3897/BDJ.13.e153402

High school students replicate insect study from 40 years ago

The goal was to examine how the carrion beetle population has changed over the years.

Over forty years ago, Menno Schilthuizen, while still a high school student, conducted a study on carrion beetles at the Lichtenbeek estate near Arnhem. Using small traps baited with meat and other attractants, he recorded over a thousand beetles in the spring of 1982, meticulously documenting the species and their numbers.

A scan of a handwritten data table listing various species, their pot numbers, and numerical counts, with "Familie Cholevidae" noted at the bottom. — Field notes from 1982.

A scan of a hand-written data table listing various species and corresponding numerical values. — Field notes from 1982.

Four decades on, Schilthuizen (now a professor of evolution and biodiversity at Leiden University) and his team collaborated with high school students from the Thomas a Kempis College in Arnhem to replicate the study with precision: at the same location, using the same methods, on the same dates. The goal was to examine how the carrion beetle population has changed over the years. Their findings have been published in the Biodiversity Data Journal; the article can be viewed online here.

A photo of three people doing research in a lush green forest, with one kneeling on the ground and others examining a device. — Fieldwork.

Key findings: shifts in biodiversity

The high school students analysed the beetles that they collected. Their research revealed that some carrion beetle species have disappeared, while other, new species have appeared. However, the overall number of species and population densities have remained largely the same.

A photo of a teenage boy carefully pinning beetle specimens on a white surface, surrounded by lab equipment and tools. — Sorting and mounting specimens.

A photo of two teenagers working and laughing in a laboratory setting, surrounded by microscopes, glass jars, and various scientific tools on a table. — Sorting and mounting specimens.

One striking discovery was that common species have become even more abundant, while rare species have become even rarer. This widening gap in species commonness suggests a decline in biodiversity, which could signal the potential local extinction of the rarer species.

A citizen science initiative

The research was initiated by the Taxon Foundation, a nonprofit set up and headed by Schilthuizen, in collaboration with biology teacher Leonie Wezendonk of the Thomas a Kempis College. Taxon foundation specializes in biodiversity research conducted by school children, local residents, and other community scientists. The project was made possible through funding from the Netherlands Cultuurfonds and the Suzanne Hovinga Foundation.

Research article:

Schilthuizen M, van der Sterren T, Kersten I, Groenhof M, van der Meulen H, Wezendonk L (2025) Resampling a carrion beetle fauna after 40 years (Coleoptera, Staphylinidae, Silphinae, and Leiodidae, Cholevinae). Biodiversity Data Journal 13: e151206. https://doi.org/10.3897/BDJ.13.e151206

Inspiring a new generation of taxonomists

New species of Australian miracine wasps described with school students as part of the Insect investigators citizen science project

Guest blog post by Mollie Slater-Baker

It is estimated that only around 20% of the world’s insects are formally described. A formal description is the foundational understanding of a species, including a scientific name, information on how to identify the species, its biology, and where it can be found. With such a large proportion of our insects lacking this foundational information, we are left viewing the insect world through a very small window. This has major implications for conservation of insects and the ecosystems in which they play integral roles. It also limits our understanding of our natural resources, with the study of insects being valuable in a variety of fields, from healthcare and biochemistry, to biological pest control, to insect-inspired engineering.

Unfortunately, with a worldwide lack of taxonomic experts, limited funding, and the immense scale of describing the world’s insects, documenting our insect diversity before it’s lost to extinction is a considerable challenge. But this is where community engagement and citizen science can shine.

Experts in insect taxonomy “threatened by extinction” reveals the first European Red List of Taxonomists

The Insect Investigators citizen science project, which ran in Australia in 2022, aimed to involve schools throughout the taxonomic process, to contribute to large-scale collection and documentation of Australian insects, while fostering an appreciation for insect diversity and the role of taxonomy. Fifty rural schools from Queensland, South Australia, and Western Australia participated by setting up Malaise traps (tent-like passive insect traps) to sample local invertebrates near their schools over four weeks. This project resulted in over 60 thousand insect specimens being collected from often under-sampled, more remote parts of Australia. The resulting specimens are preserved and deposited in Australian museums for future research, including taxonomic work.

Malaise traps set up at Kwoorabup Nature School (left) and Beerwah State High School (right) to sample insects as part of the Insect Investigators project.

Through this project, several schools were involved in collecting a rarely collected group of parasitoid wasps belonging to the subfamily Miracinae (aka miracine wasps). These tiny wasps (typically 1-2mm in length) are very difficult to collect using traditional methods, though they appear to be quite diverse in Australia. As parasitoids, miracine wasps require an invertebrate host to complete their lifecycle. For miracine wasps, this host is a leaf-mining caterpillar – the kind that eats small twisting tunnels on the inside of leaves. The wasps lay their eggs inside these caterpillars, and the wasp larvae hatch and eat the caterpillar from the inside out!

‘Insect soup’ – specimens collected via Malaise Trap at Kwoorabup Nature School.

Due to their caterpillar-eating biology, and the fact that they are picky eaters, usually targeting a specific species, these wasps can be used to control pests. For example, the miracine wasp species Mirax insularis in Puerto Rico, and Centistidea striata in Brazil, are known to attack coffee leaf-miners, a major pest of coffee plantations – so you may have one of these wasps to thank for your morning coffee!

As part of this project, we engaged with schools to involve them throughout the process of describing the miracine wasps they had collected. First, we ran in-person and online or hybrid workshops with the students to teach them about the new wasp they had discovered, and the taxonomic process involved in describing and naming it. The students then brainstormed a variety of creative names for the new species, which were collaboratively curated and voted upon to arrive at the final species names.

From Queensland, we have Mirax supremus, meaning ‘highest’ in Latin, named after the Pinnacle program at Beerwah State High School, which the students were a part of.

From South Australia, comes Ceduna Area School’s species, Mirax ceduna, named after the school and town the wasp was collected from (colloquially known as the ‘golden bum wasp’).

And from Kwoorabup Nature School in Western Australia (WA), Mirax kaatijan, meaning knowledge/learning in the Noongar language of the south-west region of WA, to represent the new knowledge the students had learnt about insect diversity, and the importance of knowledge about our insects.

Though the descriptions themselves are a small step towards the immense task of describing Australia’s insects, it was inspiring to see the students and their communities really engage with the process and build a connection with their local insects, and an appreciation for these tiny, often-overlooked wasps. We hope this project plays a role in inspiring the next generation of budding entomologists and taxonomists in Australia.

References

1. Stork, N.E., How Many Species of Insects and Other Terrestrial Arthropods Are There on Earth? Annual Review of Entomology, 2018. 63(1): p. 31-45.

2. Song, C., et al., Bee Sting-Inspired Inflammation-Responsive Microneedles for Periodontal Disease Treatment. Research (Wash D C), 2023. 6: p. 0119.

3. Mika, N., H. Zorn, and M. Rühl, Insect-derived enzymes: a treasure for industrial biotechnology and food biotechnology. Adv Biochem Eng Biotechnol, 2013. 136: p. 1-17.

4. Galli, M., et al., Can biocontrol be the game-changer in integrated pest management? A review of definitions, methods and strategies. Journal of Plant Diseases and Protection, 2024. 131(2): p. 265-291.

5. Gorb, S.N. and E.V. Gorb, Insect-inspired architecture to build sustainable cities. Current Opinion in Insect Science, 2020. 40: p. 62-70.

6. Zhang, Y., A. Reid, and J.F.C. Windmill, Insect-inspired acoustic micro-sensors. Current Opinion in Insect Science, 2018. 30: p. 33-38.

7. Suzuki, K., et al., Development of water surface mobile robot inspired by water striders. Micro & Nano Letters, 2017. 12(8): p. 575-579.

8. Engel, M.S., et al., The taxonomic impediment: a shortage of taxonomists, not the lack of technical approaches. Zoological Journal of the Linnean Society, 2021. 193(2): p. 381-387.

9. Slater‐Baker, M.R., et al., First record of miracine parasitoid wasps (Hymenoptera: Braconidae) from Australia: molecular phylogenetics and morphology reveal multiple new species. Austral Entomology, 2022. 61(1): p. 49-67.

10. Navarro, P. and F. Gallardo, Host instar preference of Mirax insularis (Muesebeck) (Hymenoptera: Braconidae), a koinobiont parasitoid of Leucoptera coffeella Guerin-Meneville (Lepidoptera: Lyonetiidae). Journal of Agriculture- University of Puerto Rico, 2009. 93: p. 139-142.

11. Penteado-Dias, A.M., New species of parasitoids on Perileucoptera coffeella ( Guérin-Menèville) (Lepidoptera, Lyonetiidae) from Brazil. Zoologische Mededelingen, 1999. 73: p. 189-197.

12. Slater-Baker M-R, Guzik M, Rodriguez J, Howe A, Woodward A, Ducker N, Fagan-Jeffries E (2025) Three new species of Australian miracine parasitoid wasps collected by regional schools as part of the Insect Investigators citizen science project (Hymenoptera, Braconidae, Miracinae). Journal of Hymenoptera Research 98: 19-45. https://doi.org/10.3897/jhr.98.137806

Pensoft joins the FORSAID project in the next chapter for forest health

With its extensive experience in science communication and dissemination, Pensoft will help maximise FORSAID’s impact and ensure its long-term legacy.

As the dedicated communication partner of the project, Pensoft will lead efforts to popularise a new early detection paradigm targeting forest pests in Europe

The issue of pest proliferation is felt more acutely than ever in the wake of globalisation and climate change. As pests and pathogens spread across biomes, the threat to forests and the health of the plants within is only increasing. Cognisant of this worrying trend, the European Union has actively pursued mitigation and prevention measures over the last few years. Grassroots efforts are also on the rise as insights from academia and citizen science alike improve monitoring capabilities on the ground.

To address the core of the problem in its entirety, greater coordination and innovation across the board are required.

It is with this tenet in mind that FORSAID: FORest Surveillance with Artificial Intelligence and Digital Technologies – first emerged on the scene as a Horizon Europе-funded project.

The goal of FORSAID is the inception and deployment of a technology-based early detection system for EU-regulated forest pests.

The pursuit of that very goal brought together 17 partner organisations from 10 countries. FORSAID is funded by the European Union’s Horizon Europe research and innovation programme. Having officially started in September 2024, it is set to continue until February 2028.

Within the team, Pensoft has taken the lead in the domains of Communication, Dissemination and Exploitation. Its long-standing expertise vis-a-vis public campaigns for science initiatives will be harnessed in an attempt to show the benefits and solutions that the latest digital innovations can bring to plant health monitoring. Thus, Pensoft is to help maximise FORSAID’s impact and ensure its long-term legacy.

The project will be presented across the public domain by following a tailored communication plan. Examples of its implementation include social media campaigns, regular updates of a dedicated FORSAID website and synergies with various stakeholder groups.

Foresight in FORSAID

The project consortium firmly believes that digital innovation is the key to a truly effective pest detection framework. This signifies the central role of technology at all stages of this paradigm’s development process.

More specifically, the employment of digital tools will proceed on several levels:

Satellite and drone surveillance will be employed to remotely map out forested areas of interest and assess the extent of plant damage caused by pests and pathogens.
Smart traps and DNA barcoding will serve to identify and sort out different species of pests.
Artificial intelligence (AI) models will assist throughout this process as it helps to automate the procedure, thereby increasing efficiency.

Building on the technology-based research and experimentation, insights from a variety of stakeholders will also be gathered to crystalise FORSAID’s approach.

The consortium’s intent here is the consolidation of a network of interested and involved actors who would ensure the long-term application of the project’s results. A special focus is also placed on citizen scientists, whose practical needs will be considered in the design of the digital tools developed within FORSAID. Finally, a detailed economic analysis will assess the early detection framework and its associated technological instruments, in order to ensure its usability in the long run.

The FORSAID project consortium at the project’s kick-off meeting held on 26 September 2024 in Padua, Italy.

Full list of project partners:

The University of Padua (Italy)
The National Research Council of Italy (Italy)
EFOS Information Solutions D.O.O. (Slovenia)
European and Mediterranean Plant Protection Organisation (international)
European Institute of Planted Forest (international)
National Institute of Agricultural and Veterinary Research – INRAE (France)
National Research Institute for Agriculture, Food and Environment (Portugal)
Forest Research Centre (Portugal)
Karlsruhe Institute of Technology (Germany)
Linnaeus University (Sweden)
Museum für Naturkunde – Leibniz Institute for Evolutionand Biodiversity Science (Germany)
Pensoft Publishers (Bulgaria)
Slovenian Forestry Institute (Slovenia)
Telespazio France SAS (France)
University of Copenhagen (Denmark)
Ukrainian National Forestry University (Ukraine)
Swiss Federal Institute for Forest, Snow and Landscape Research WSL (Switzerland)

You can follow the project’s progress and achievements on the dedicated LinkedIn and BlueSky pages and FORSAID’S brand new official website.

Community scientists at the Field Museum have digitized more than a quarter-million items and records

Volunteers and members of the “Collections Club” of the Field Museum provide a blueprint for how community scientists can help researchers around the world.

*Matt von Konrat teaching student volunteers how to digitize museum specimens.*
*Photo by Michelle Kuo (c).*

There are over three billion specimens and cultural objects housed in natural history collections around the world—things like fossils, dried plants, and pinned insects. Close to forty million of them are at the Field Museum in Chicago, mostly behind the scenes in a vast library documenting life on Earth.

These collections are used by scientists at the museum and around the world to explore what lived where and when and how living things have changed over time.

However, much of the information about these collections is hard to access, because there are no digital records of it.

*Specimens from the “behind-the-scenes collections“ at the Field Museum.*
*Photo by John Weinstein*.

Community scientists volunteering at the Field Museum who have formed a Collections Club are helping to solve this problem.

So far, they’ve digitized more than a quarter-million collections items and records.

The Field Museum recently published a scientific paper in the journal Natural History Collections and Museumomics about the work of these community scientists as a record of what they’ve accomplished and as a blueprint for other natural history collections to work with volunteers in their communities.

By the way, the Field Museum prefers to use the term “community scientists” rather than the synonymous “citizen scientists”, in order to emphasize that the work is a community effort. They also wish to be inclusive of all volunteers regardless of their citizenship status. Several community scientists are in fact listed as co-authors of the new.

“What’s remarkable is how the enthusiasm has sustained and grown,” says Matt von Konrat, Head of Botanical Collections at the Field Museum and the lead author of the paper.

“Our surveys show that participants are increasingly motivated by altruistic reasons—they want to contribute to science and support the museum’s mission.

The fact that many of our volunteers are now co-authors on this scientific paper shows how far we’ve come in breaking down traditional barriers between professional scientists and community researchers.”

Since 2015, over 3,800 volunteers have contributed more than 13,500 hours helping to digitize, catalog, and preserve specimens—equivalent to nearly eight years of full-time work. Their efforts have processed over 300,000 scientific specimens, records and objects, making valuable data accessible to researchers worldwide.

“At its core, the Field Museum strives to connect people to the natural world and the human story. The Collections Club reflects this mission by transforming over 300,000 specimens into a digital and physical legacy, providing scientists across the globe with the data they need to understand and protect our biodiversity,”
says von Konrat.

The program’s success has been driven by both in-person and virtual engagement opportunities, particularly through initiatives like WeDigBio (Worldwide Engagement for Digitizing Biocollections) and the Field Museum’s Collections Club. During the height of the COVID-19 pandemic, the program successfully pivoted to virtual participation, maintaining strong community connections when they were needed most.

*Community scientists at the Field Museum’s 2019 WeDigBio event curating lichen specimens – a critical process unlocking scientific information from natural history collections.*
*Photo by Robert Salm.*

“There were so many dynamics working against us during COVID: sporadic closures and re-openings in Chicago of restaurants, parks, museums, and businesses. The ability for me to continue cataloging and repackaging specimens for the Field Museum was the only constant and sane reference for me; days of the week and working hours had no boundaries. I don’t think any other museum in Chicago had volunteers as dedicated as the Field Museum, and I was happy to be part of the experience.”
says Robert Salm, a volunteer in the Field Museum’s botanical collections.

*A Mobile Museum display made by Field Museum Collections Club members Winne and Gwen Blake.*
*Photo by Erryn Blake.*

The impact extends beyond adults to inspire the next generation of scientists. In one touching example highlighted in the paper, two fifth-grade students were so inspired by their participation that they created their own “Mobile Museum” to share natural history with other young people. These young scientists are among the paper’s co-authors, demonstrating the program’s commitment to elevating youth voices in science.

According to the Blake family, whose children Winnie and Gwen created the Mobile Museum, “Collections Club makes science tangible, accessible, and real. It shows students that away from a conventional classroom setting, where science can feel like a chore, this program helps in contributing to a global community benefiting countless research efforts. The Mobile Museum was created as an extension of Collections Club to bring the passion for science to kids of all ages.”

Collections Club members Winne (blue shirt) and Gwen (pink shirt).
Photo by Erryn Blake.

The Field Museum’s model demonstrates how institutions of any size can engage their communities in meaningful scientific work. The paper provides detailed recommendations and checklists for other organizations looking to develop similar programs.

“This success story wouldn’t have been possible without Chicago’s vibrant media landscape helping us reach new audiences,” said von Konrat.

“From local blogs to major television networks, each platform played a vital role in building this community of scientists.

We hope this model inspires other museums and research institutions to build similar programs.

Together, we are fostering a shared legacy that underscores the value of biodiversity and scientific heritage for future generations.”

The full research paper, published in the journal Natural History Collections and Museomics, provides a comprehensive overview of the program’s development and impact over nearly a decade of community engagement, while setting a new standard for inclusive scientific authorship.

For more information about getting involved in community science at the Field Museum, visit https://www.fieldmuseum.org/activity/collections-club—the next event is coming up in January 2025!

Stay up-to-date with publications and news from the Natural History Collections and Museomics (NHCM) journal on social media on BlueSky, X and Facebook.

Research article:

von Konrat M, Rodriguez Y, Bailey C, Gwilliam III GF, Christian C, Aguero B, Ahn J, Albion Z, Allen JR, Bailey C, Blake E, Blake W, Blake G, Briscoe L, Budke JM, Campbell T, Chansler M, Clark D, Delapena R, Denslow M, Dodinval D, Dux E, Ellis S, Ellwood E, Enkhbayer M, Ens B, Evans NM, Fabian A, Ferguson A, Gaswick W, Golembiewski K, Grant S, Hancock L, Hansen K, Janney B, Jones J, Kachian Z, Kawasaki ML, Kellum K, Leek O, Lichamer A, Maier C, Mast A, Martinec JL, Mayer P, Mladek M, Nadhifah A, Neefus C, Nodulman M, Oliver M, Overberg K, Townsend Peterson A, Qazi-Lampert A, Rothfels C, Ryan ZA, Salm R, Schreiner D, Schreiner M, Tepe EJ, Turcatel M, Vega A, Wade H, Webbink K, Weinand D, Widhelm T, Zwingelberg M (2024) From spectators to stewards: Transforming public involvement in natural history collections. Natural History Collections and Museomics 1: 1-33. https://doi.org/10.3897/nhcm.1.138247

News announcement originally published by the Field Museum. Republished with permission.

How can social media users help researchers with ecological or biodiversity studies?

Images and videos on social media platforms like Instagram can help sample species occurrence data. Here’s how

Guest blog post by Melanie Werner

Researchers studying the distribution of species need information about where the plant or animal species in question occurs. This usually requires a field study, which is costly, time-consuming and often CO₂-intensive. In addition, not all locations where species occur are accessible to humans, such as high mountain areas. As a result, the full range of species is often not covered and the availability of species information is a major challenge for ecological research.

Social media and citizen science projects offer a great potential to increase this availability. Citizen science refers to the involvement of non-experts in scientific projects. In the case of ecological studies, for example, this is the sampling of species occurrences. Thanks to smartphones – capable of capturing high-quality photos and recording precise locations – the ability to gather and share species information has grown significantly. It’s quite simple: take a photo, save the coordinates, upload it, and researchers can use this data to map species distributions. User-friendly platforms or Apps like iNaturalist have become invaluable for this purpose, enabling researchers and citizen scientists to share and utilize occurrence data to advance ecological understanding.

*Process of species occurrence data sampling by citizen science projects*.

Although some people are interested in and help with such projects, they do not yet reach a broad mass of people. In our study, we explore the potential of the social media platform Instagram, which is one of the largest social media platforms with 2 billion users worldwide and millions of daily uploads. We hypothesize that even more species occurrence data is being generated on this platform, often without users realising its scientific value.

We searched for Instagram posts from 2021 to 2022 in which the tree species Nothofagus pumilio and the location of the photo can be identified. The deciduous species N. pumilio occurs at the treeline in the southern Andes. The species’ vibrant orange-red autumn colouring, in combination to spectacular landscapes, makes it a popular photo motif for tourists, hikers, and locals alike resulting in numerous Instagram posts. Because treelines are often sensitive to climate change, studying the distribution and dynamics of this species is of particular interest.

*Nothofagus pumilio at Mount Fitz Roy, Patagonia (Marina Zvada, 2024 available at:* *https://unsplash.com/de/fotos/blick-auf-ein-gebirge-in-der-ferne-vMoLf1OrB-k?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash)*

Our study began by searching Instagram for specific hashtags related to the species (#nothofaguspumilio and #lenga), as well as for locations through location tags, hashtags, and descriptions within posts. This approach allowed us to identify as many images with N. pumilio as possible, even if the users were unaware of its presence.

View this post on Instagram

A post shared by Melanie Werner (@nothofagus_pumilio_research)

To select suitable posts, we focused on those where the species could be clearly identified, the location was described, and landscape elements (e.g. mountains, waterbodies, glaciers, urban and tourist area) are visible in the image, that could also be recognised in satellite imagery. For each post, we mapped at least one point at the location where the photo was taken. Additionally, we included occurrences of N. pumilio visible in the background, such as autumn-coloured treelines. This approach ensured a more comprehensive and evenly distributed sampling of the species’ range. The next image illustrates the sampling process of a post captured at Laguna Capri with Mount Fitz Roy in the background.

Suitable Instagram post (fernando.v.fotografia, 2022, left) and four transferred points with landscape elements (red boxes, right) that helped to identify the location, which is also described in the post with location tag and post caption.

In this way, we were able to generate 1238 Instagram ground truthing points. These points can be directly used in ecological studies. However, it is important to note that our Instagram ground truthing points, like most citizen science data, is spatially biased. This means that locations can only be captured where people have access, leaving remote or high-altitude areas unrepresented.

For this reason, we added a remote sensing method to our study. As this deciduous species forms mono-species forests at the treeline, it can also be identified in satellite imagery. The occurrence data obtained through supervised classification was then validated using the Instagram ground truthing points. This approach allows us to generate less-biased occurrence data for the species across its entire 2000 km latitudinal range.

*All 1238 Instagram ground truthing points sampled by our approach (left) and the remote sensing result (right)*.

Participating in citizen science projects is an essential contribution to research. We encourage you to explore citizen science platforms such as iNaturalist, eBird, or naturgucker, and to include hashtags and detailed location descriptions – ideally with coordinates – when posting your holiday or everyday photos on Instagram. Every contribution helps!

Research article:

Werner M, Weidinger J, Böhner J, Schickhoff U, Bobrowski M (2024) Instagram data for validating Nothofagus pumilio distribution mapping in the Southern Andes: A novel ground truthing approach. Frontiers of Biogeography 17: e140606. https://doi.org/10.21425/fob.17.140606

Eyes open and toes out of water: how a giant water bug reached the island of Cyprus

A new visitor was reported on the coast of Cyprus, thanks to the growing power of citizen science.

The island of Cyprus, although considered a hotspot for biodiversity in the Mediterranean, is more famous for its beautiful sunny coasts than for its insect fauna. Nevertheless, some visitors of its highly populated beaches, with their observations and curiosity, have provided important information for a species never recorded before on the island: a giant water bug, also known as a toe biter.

Scientists Michael Hadjiconstantis from the Association for the Protection of Natural Heritage and Biodiversity of Cyprus, Iakovos Tziortzis from the Ministry of Agriculture, Rural Development and Environment of Cyprus, and Kadir Boğaç Kunt from the Cyprus Wildlife Research Institute collected information and specimens from an increasing number of records of the giant water bug on the east coastline of the island in late spring and summer of 2020 and 2021. The species, known for inhabiting ponds and slowly moving freshwaters, had never been recorded on the island before, although established populations are known in adjacent Mediterranean countries such as Greece, Turkey, and Israel.

Locations of the reported Giant water bug sightings in Cyprus.

Also referred to as Electric light bug, this giant water bug is described as a vicious hunter, praying on invertebrates, fish, turtles, and even birds. What is even scarier, as the largest European true bug and the largest European water insect and measuring up to 12 cm, it has a reputation of inflicting very painful bites when handled carelessly.

Its appearance, mainly on the eastern coastal front of the island, was initially recorded by swimmers, who were surprised by the fearsome looks and size of the bug. They either directly contacted the experts or published photos and videos online, mainly on Facebook groups related to biodiversity. The authors collected some of the specimens for further study. They also proceeded with an extensive online search on relevant online observation platforms (i.e. iNaturalist) in order to track any other reports of the species on the island. In addition, they sampled nearby wetlands, but did not spot the bug. End to end, a total of seven sightings were eventually recorded: five from social media and two after direct communication with the author team. Two specimens were obtained and examined morphologically to verify the species. The observations were recorded in a research article in the open-access journal Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa”.

Having in mind that the toe biter is an iconic species accompanied by creepy stories concerning its encounters with humans, the authors assume that it is unlikely that it had gone unnoticed for too long. They consider it possible that several migration events might have been triggered in a short period of time by nearby countries hosting the species, such as Israel, Lebanon, and Syria. The specimens could have been transferred by wind or sea currents, as assumed by other researchers, or could have been driven by a decrease in food resources in their initial area of distribution.

Despite the number of recordings in a short timeframe, no conclusions can be drawn for the moment on the establishment of a population of the species on the island. This is further to be investigated, and as the initial recording of the species, citizen science can have an important role in this. The authors urge the public to be alert: “Naturalists looking for alien-like critters can provide valuable information on the presence and a possible establishment of the species through citizen science.” Until then, they warn: “Cypriots should keep their eyes open and their toes out of the water”.

Research article:

Hadjiconstantis M., Tziortzis I., Kunt KB (2023). On the importance of citizen-science: first records of the Giant water bug Lethocerus patruelis (Hemiptera, Belostomatidae) in Cyprus. Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 66 (2): 291–299. https://travaux.pensoft.net/article/94457/

Forgotten tropical plants rediscovered after 100+ years with the help of community science

Through the collaborative efforts of botanists and citizen scientists, these plants have been rediscovered after decades, some even after more than a century.

Deep in the tropical Andes are hiding plants that were discovered and then forgotten; plants that we knew almost nothing about. Now, thanks to the combined efforts of botanists from Germany, Ecuador, Peru and Costa Rica and amateur plant enthusiasts, these plants have been rediscovered, some of them after more than 100 years. The findings were described in the open-access journal PhytoKeys.

The plants belong to Nasa, a genus from the Blazing Star family (Loasaceae) that has long caused headaches to scientists as its delicate but painfully urticant leaves make it difficult to collect. Most of them are rare, highly endemic, and only around for short periods, which makes them even more unlikely to end up in a herbarium collection.

Luckily, today’s scientists don’t have to rely on herbaria as their sole source of material and clues. Thanks to the advent of global networking and the increasing use of free data repositories, there is a lot more biodiversity data now that is available to use and easily accessible, for example as geo-referenced occurrence records and photos. Citizen science platform iNaturalist, where users can, among others, post photographic occurrence records, has turned into a valuable tool for biodiversity scientists, and plays a significant role in the rediscovery of these Andean plants.

One notable species, Nasa colanii, had only been recorded once, in 1978, until the research team came upon a photograph from 2019. This scarcity in records might have to do with the fact that the plant grows in a highly inaccessible region: in a cloud forest in the buffer zone of Peru’s Cordillera de Colán National Sanctuary, at an elevation of 2605 m.

A flowering branch of Nasa colanii. Photo by A. A. Wong Sato

Another species hadn’t been reported for approximately 130 years when iNaturalist users confirmed its existence in 2022 by uploading photographs. Nasa ferox had been known for centuries, but it didn’t get its scientific description until 2000. “Given the location of the park close to the [Ecuadorian] city of Cuenca, and the fact that the important road 582 goes through the park makes it particularly surprising that the species has not been reported in such a long time, even more so if we consider the numerous botanical expeditions that have been carried out in the general region,” the researchers write in their paper. In fact, only a small population of about ten fertile plants of N. ferox has been found, with the plants always growing in sheltered places such as in rock crevices or at the base of shrubs.

Remarkably, the typical form of Nasa humboldtiana called Nasa humboldtiana subspecies humboldtiana was rediscovered after 162 years, when the research team found a specimen in a conserved remnant of montane Andean forest in the province of Chimborazo, Ecuador.

Flower of Nasa humboldtiana subspecies humboldtiana. Photo by X. Cornejo

But probably the most exciting discoveries happened when the team found species that have been considered extinct in the wild. Two species of Nasa, namely N. hastata and N. solaria, were believed to share this fate, both from the Peruvian Department of Lima, a comparably well sampled area, given the proximity to the national capital. Until very recently, both species “remained unknown (or almost so) in the wild.” Earlier attempts to recollect these species near their type localities where they have been found some 100 years ago failed and it needed the help of iNaturalist to reveal that they are still present in the area.

Nasa hastata was recently rediscovered, after, for the first time, photos of living plants showed up taken by the sister of one of the authors. Only a handful of plants have since been reported from two sites, some 7 km apart. Similarly, a few dozens of plants have been found so far from N. solaria occurring in four small relict populations in remnants of forest that once covered larger areas in this region.

Flower of Nasa hastata. Photo by P. Gonzáles

Observations uploaded to iNaturalist also revealed important information on another species, Nasa ramirezii,providing the first photographs of living plants from Ecuador and the first data on its exact location.

“All these discoveries serve as a reminder that even well-studied regions harbor diversity that can so easily remain overlooked and unexplored, and point to the role of botanists in documenting biodiversity which is an essential prerequisite for any conservation effort.” leading author Tilo Henning from the Leibniz Center for Agricultural Landscape Research (ZALF) says.

“Hopefully, as more scientists and members of the public contribute to the database, and more professionals get involved in the curation, more undescribed or ‘long lost’ taxa will be found. Our examples of the rediscovery of Nasa ferox after 130 years and Nasa hastata after 100 years, both ‘found’ on iNaturalist underscore this point,” the researchers say in their study.

Original source:

Henning T, Acuña-Castillo R, Cornejo X, Gonzáles P, Segovia E, Wong Sato AA, Weigend M (2023) When the absence of evidence is not the evidence of absence: Nasa (Loasaceae) rediscoveries from Peru and Ecuador, and the contribution of community science networks. PhytoKeys 229: 1-19. https://doi.org/10.3897/phytokeys.229.100082

Beetles in a bottle: a message from aliens to schools

A citizen science project in Italy had high school students monitor the activities of ambrosia beetles, catching them with traps made from recycled plastic bottles.

While invasive alien species (IAS) represent a growing threat to global biodiversity and ecosystems, public awareness of them hasn’t seen a significant increase. Many researchers believe informing people about IAS is an essential long-term investment to counter biological invasions; in particular, “learning by doing” is an extremely effective method for involving new audiences, such as students.

Map of the study area (the Veneto Region) indicating the high school locations.

About 500 Italian students aged 11-18 took part in a citizen science project that led to new geographical records of two alien species of ambrosia beetles considered to be quarantine pests by the European Union. Dr. Fernanda Colombari and Prof. Andrea Battisti of the University of Padova have described the results in a paper in the open-access journal NeoBiota.

The project involved schools located in urban areas in north-eastern Italy and aimed to connect environmental education and experiential outdoor learning through lectures, videos, reports, and large-scale surveillance of ambrosia beetles. The students used plastic bottles and hand sanitizer to trap ambrosia beetles in their school grounds. They then assessed their abundance, looking at the different species. Before and after the educational activities, their knowledge and awareness of IAS were tested using simple anonymous questionnaires.

Schematic representation of a plastic bottle trap filled with hand sanitizer as attractant

“Our study aimed to both educate students and collect scientific data at sites such as schools where surveillance for potentially invasive ambrosia beetles is not usually conducted, or where it is sometimes misunderstood,” Dr. Colombari and Prof. Battisti write in their paper.

Identifying the specimens collected by the students, the authors found that IAS amounted to 35% of total catches. Remarkably, two out of the four alien species caught, Cnestus mutilatus and Anisandrus maiche, were recorded for the first time in Europe thanks to this study.

Furthermore, questionnaire results showed that the students acquired greater knowledge and increased their awareness and interest in IAS by more than 50%. After the experiment, most of them were interested in learning more about the negative effects of the introduction of IAS and practices to limit their spread.

Cnestus mutilatus. Photo by Durham Field Office – Forest Health Protection under a CC BY-NC-SA 2.0 license.

This study shows that citizen science can successfully involve school students, giving them an opportunity to contribute in an effective early detection of IAS, as most first records occur in cities or suburban areas. The results also point to the primary role of education, which is as a major driver of change in tackling sustainability challenges. Moreover, as students bring home the message and share it with their relatives, the process supports intergenerational learning and enlarges public collaboration.

A plastic bottle trap filled with hand sanitizer as attractant. Photo by Dr Fernanda Colombari

“People are often unaware of the role they have in the entire invasive process,” the researchers write in their study. Citizen science projects like this one are more than a reliable tool for collecting scientific data; they also help engage the public and spread awareness of biological invasions, eventually contributing to the creation of more efficient management strategies.

The monitoring programme in this study was conducted in the context of the European project HOMED (Holistic management of emerging forest pests and diseases), which has developed a full panel of scientific knowledge and practical solutions for the management of emerging native and non-native pests and pathogens threatening European forests. The main results of HOMED’s research are publically available in a special issue in the open-access scholarly journal NeoBiota.

Original source:

Colombari F, Battisti A (2023) Citizen science at school increases awareness of biological invasions and contributes to the detection of exotic ambrosia beetles. In: Jactel H, Orazio C, Robinet C, Douma JC, Santini A, Battisti A, Branco M, Seehausen L, Kenis M (Eds) Conceptual and technical innovations to better manage invasions of alien pests and pathogens in forests. NeoBiota 84: 211-229. https://doi.org/10.3897/neobiota.84.95177

Citizen scientists discover new ‘snug’ in Brunei forest, name it after retiring field centre manager

Working with the scientific travel agency Taxon Expeditions, citizen scientists studed specimens, and analyse their DNA in a field camp in the heart of the forest.

Semislugs, or ‘snugs’ as they are affectionately known among mollusc researchers, are like the squatters of the snail world: they do carry a home on their back but it is too small to live in. Still, it offers a sort of protection, while not getting in the way of the worm-like physique of the slug. For reasons unknown, on the island of Borneo, which is shared among the countries of Brunei, Malaysia, and Indonesia, most slugs are of the semislug type. The genus Microparmarion there consists of around 10 semislug species, most of which are found in the cooler forests of the mountains. So, when citizen scientists discovered a Microparmarion in the hot lowland forest of Ulu Temburong National Park, Brunei, as part of their expedition, they were surprised.

A team of citizen scientists in the Brunei forest, searching for slugs and snails.

For the past years, the scientific travel agency Taxon Expeditions, in collaboration with Universiti Brunei Darussalam (UBD) has been organising biodiversity discovery trips for scientists, students, and laypersons to this forest. On the first trip, in 2018, during a night walk, participant Simon Berenyi, who runs an ethical pest control company in the UK, reached up to a dead leaf suspended over the trail. Everybody—the other participants, even the resident snail expert—had ducked and passed underneath this dead leaf without so much as giving it a glance. But something on its surface caught Simon’s eye. “Oi, is that a slug?” he exclaimed, and picked a slimy, well-camouflaged mollusc off it.

At the time, the team’s zoologists already suspected it was a new species – nothing like it had ever been found in this corner of the island. But that single specimen was not enough to publish its description as a new species. Over the years, successive expeditions to the same area came up with several more specimens of the same species, which made it clear that it was really a species never seen before.

On the 2022 expedition, a team composed of UBD students Nurilya Ezzwan and Izzah Hamdani and citizen scientist Harrison Wu from Virginia, USA, finished the description. Using the portable lab that Taxon Expeditions always carries with them, the team studied the animals’ shell, reproductive organs, and DNA, and prepared a paper for the open-access Biodiversity Data Journal, where it was published this week.

Citizen scientists from three continents help discover a new, giant slug from Europe

As usual on Taxon Expedition trips, on the last night the team voted on the scientific name for the new species. With an overwhelming majority, the ‘snug’ was named after Mr. Md Salleh Abdullah Bat, the field centre supervisor, who would retire just weeks after the team left. Mr. Salleh himself agrees that it is indeed a very fitting farewell gift.

Research article:

Schilthuizen M, Berenyi S, Ezzwan NSMN, Hamdani NIAA, Wu H, De Antoni L, Vincenzi L, de Gier W, van Peursen ADP, Njunjić I, Delledonne M, Slik F, Grafe U, Cicuzza D (2023) A new semi-slug of the genus Microparmarion from Brunei, discovered, described and DNA-barcoded on citizen-science ‘taxon expeditions’ (Gastropoda, Stylommatophora, Ariophantidae). Biodiversity Data Journal 11: e101579. https://doi.org/10.3897/BDJ.11.e101579

Photos by Pierre Escoubas

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