Tag: Bulgaria

New Harvester Ant Species Discovered in Bulgaria’s Eastern Rhodopes Mountains

The new species, which was described based on morphological characteristics and DNA barcoding from worker, gyne and male castes, brings the total number of Messor species known from Bulgaria to nine.

An international team of researchers has announced the discovery of a new species of harvester ant, officially named Messor odrysarum. The discovery was made by researchers Albena Lapeva-Gjonova of Sofia University in Bulgaria and Lech Borowiec of the University of Wrocław in Poland.

The findings were recently published in the scientific journal ZooKeys and bring the total number of recognized Messor ant species in Bulgaria to nine.

A Nod to Ancient History

Messor odrysarum sp. nov., major worker: A. dorsal view; B. lateral view. Scale bar: 2 mm. Credit to L. Borowiec.
Messor odrysarum sp. nov., major worker: A. head and antennae; B. head sculpture Scale bar: 2 mm. Credit to L. Borowiec.

The newly identified ant is part of the Messor genus, a group well-known for their ecological role as grain and seed collectors in arid and semi-arid environments. The researchers chose the specific name “odrysarum” to honor the ancient Thracian state of Odrysia (roughly founded in early 5th century BC), whose historical geographical borders included the region where this new species was found.

Habitat and Behavior

*Messor* *odrysarum* sp. nov.: A. type locality; B. nest construction. Credit to A. Lapeva-Gjonova.

Messor odrysarum is a lowland species that has been documented at elevations up to 647 meters in the Eastern Rhodopes region of Bulgaria. Researchers discovered their nests situated along dirt roads within oak forests and open grasslands. The nest entrances are built at ground level and “in late summer, seed remains were observed near the nest entrances”.

Messor odrysarum sp. nov. is currently only known from the Eastern Rhodopes in Bulgaria, possibly also occurring in the Thracian region of Greece and Türkiye.
explain the researchers in their article.

Distinct Physical Characteristics

Messor odrysarum sp. nov., gyne head. Scale bar: 1 mm. Credit to L. Borowiec.
Messor oertzeni, gyne head Scale bar: 1 mm. Credit to A. Lapeva-Gjonova.

Confirmed through both rigorous morphological analysis and modern COI DNA barcoding, Messor odrysarum belongs to the Messor structor species group. While it is closely related to the known Balkan-Anatolian species Messor oertzeni, there are several distinctive physical traits that make the newly discovered ant stand out.

It has a smaller overall body size compared to its close relatives and it is accented only by reddish hues on the lower genae (the cheek region of the head). It also has a narrowed head behind the eyes, longer and denser hairs (setae) on its head and midsection, and a longer antennal scape.

Scientific Significance

The formal description of Messor odrysarum helps to resolve ongoing taxonomic complexities within the Messor genus, which is known for cryptic diversity and remarkable reproductive strategies like hybridization or even xenoparity, where female gives birth to, or clones, offspring of a completely different species as part of its lifecycle.

In addition to introducing the new species, the researchers’ publication also provides a rare, updated redescription of the queen (gyne) caste of the related M. oertzeni based on newly collected specimens.

Original source:

Lapeva-Gjonova A, Borowiec L (2026) A new species of Messor from Bulgaria and redescription of the gyne of M. oertzeni Forel, 1910 (Hymenoptera, Formicidae). ZooKeys 1275: 145-168. https://doi.org/10.3897/zookeys.1275.181745

Extreme Weather Impacts White Stork Survival in Bulgaria

A comprehensive 15-year study published in the Biodiversity Data Journal details the growing threat of extreme weather on White Storks in Bulgaria.

A comprehensive 15-year study published in the Biodiversity Data Journal details the growing threat of extreme weather on White Storks (Ciconia ciconia) in Bulgaria. Long considered a symbol of good fortune and the arrival of spring, white storks hold a cherished place in Bulgarian folklore – their nesting on rooftops traditionally seen as a blessing upon the household.

The research, which is part of the topical collection “Restoration of species of conservation importance,” analyzes the admissions and treatment outcomes of injured storks at the Wildlife Rescue and Breeding Centre (WRBC) of the Green Balkans NGO between 2010 and 2025.

Led by Rusko Petrov alongside Eva Pastir of Trakia University and Gradimir Gradev of the Agricultural University of Plovdiv, the study examines how extreme weather events, specifically sudden spring frosts and wildfires, affect White Stork survival.

Map of the locations where distressed birds have been found - in blue are the locations where White Storks from the first category were found, in red are the ones from the second category. The green dot is the location of the Wildlife Rehabilitation and Breeding Centre of Green Balkans. — Map of the locations where distressed birds have been found – in blue are the locations where White Storks from the first category were found, in red are the ones from the second category. The green dot is the location of the Wildlife Rehabilitation and Breeding Centre of Green Balkans. Credit to Petrov, Pastir & Gradev, 2026.

Of 3,690 storks admitted to the WRBC over the 15-year period, researchers focused on 158 cases attributable to storms, hailstorms, strong winds, snowfalls with low temperatures, and wildfires.

A Tale of Two Disasters

Piechart showing the percentage of storks admitted due to burnt and collapsed nests between 2010-2025 — Percentage of storks admitted due to burnt and collapsed nests between 2010-2025. Credit to Petrov, Pastir & Gradev, 2026.

The results revealed a stark contrast in survival depending on the type of weather event. Overall, 49% of the extreme weather victims (77 birds) were successfully rehabilitated and released back into the wild, while 51% (81 birds) of the cases were fatal. Only two birds remained permanently disabled and were transferred to other facilities.

Notably, juvenile storks are exceptionally vulnerable to extreme conditions because they are unable to flee the nest. This is particularly tragic during wildfires, which destroy nests and trap the flightless young while adult birds flee. Consequently, survival rates for fire-related incidents were strikingly low at just 33% (32 out of 97 cases). In contrast, storks affected by storms, hailstorms, and sudden snowfalls had a significantly higher rehabilitation success rate of 74% (45 out of 61 cases).

The Climate Change Connection

The researchers identified distinct geographic and climatic patterns linked to these rescues. Wildfires primarily clustered in the warmer Upper Thracian Plain, driven by prolonged summer heatwaves and human factors. Meanwhile, cold-related rescues were prevalent in the Danubian Plain, where cold continental air masses invade during winter and early spring.

These geographic patterns are consistent with global warming trends.

Warmer winters are prompting storks to migrate earlier, exposing the returning adults to sudden, deadly spring frosts and blizzards.
explain the researchers.

Simultaneously, the increasing frequency of summer heatwaves is fueling the nest-destroying wildfires that threaten the juveniles. Petrov also notes broader implications for other species:

Our research is focused on White Storks, but the impact is similar to many other bird species and most sensitive to it are the migratory and endangered ones.
he explains.

To safeguard the White Stork, the authors underscore the urgent need for enhanced nest protection, improved wildlife rescue efforts, and proactive climate adaptation strategies to conserve the species.

Original source:

Petrov R, Pastir E, Gradev G (2026) Impact of extreme weather on White Stork (Ciconia ciconia) rehabilitation: admissions and outcomes (2010-2025). Biodiversity Data Journal 14: e182547. https://doi.org/10.3897/BDJ.14.e182547

Newly established Bulgarian Barcode of Life to support biodiversity conservation in the country

As the latest national node to join the International Barcode of Life Consortium (iBOL), its main task is to coordinate, support, and promote DNA barcoding research in Bulgaria.

On 27 September 2023, during a specialised symposium on DNA barcoding at the Bulgarian Academy of Sciences, the Bulgarian Barcode of Life (BgBOL), a Bulgarian DNA barcoding consortium, was founded.

Logo of the Bulgarian Barcode of Life (BgBOL), a Bulgarian DNA barcoding consortium and the latest national node to join the International Barcode of Life Consortium (iBOL).

By becoming the latest national node to join the International Barcode of Life Consortium (iBOL), the main task before BgBOL will be to coordinate, support, and promote DNA barcoding research in Bulgaria, with a primary focus on the study and preservation of the country’s biodiversity.

“The Bulgarian Barcode of Life opens up new horizons and opportunities to study and understand the biodiversity in Bulgaria,”
says Dr Georgi Bonchev, Institute of Plant Physiology and Genetics at the Bulgarian Academy of Sciences (BAS).

DNA barcoding is a method to identify individual organisms based on nucleotide sequences captured from short, predefined and standardised segments of DNA.

Dr Georgi Bonchev explains the DNA barcoding method at the specialised symposium held on 27 September 2023 at the Bulgarian Academy of Sciences.
*Photo by the Bulgarian Academy of Sciences.*

The formation of the BgBOL consortium is expected to strengthen the network of collaborations, ultimately contributing to the broader dissemination and popularisation of DNA barcoding research in the region.BgBOL was created by seven academic institutions: Institute of Plant Physiology and Genetics (BAS), Institute of Biodiversity and Ecosystem Research, National Museum of Natural History (BAS), Sofia University “St. Kliment Ohridski”, AgroBioInstitute (Agricultural Academy), University of Forestry, and Pensoft in its role of a scientific publisher and tech innovator well-known in the field of biodiversity science.

Prof. Lyubomir Penev joined the symposium with a talk on the publication, dissemination and management of DNA barcoding data. His presentation also touched on the relevant biodiversity data workflows and tools currently in development at Pensoft with the support of the Horizon 2020-funded project BiCIKL.
*Photo by the Bulgarian Academy of Sciences*.

As part of the event, Pensoft’s founder and CEO Prof. Lyubomir Penev led a discussion on the publication, dissemination and management of DNA barcoding data. His presentation also touched on the relevant biodiversity data workflows and tools currently in development at Pensoft with the support of the Horizon 2020-funded project BiCIKL (abbreviation for Biodiversity Community Integrated Knowledge Library).

“I’d like to congratulate everyone involved in the establishment of the Bulgarian Barcode of Life! This is a huge step forward in advancing DNA barcoding research in Bulgaria and, ultimately, the preservation of the country’s amazing biodiversity,”
comments Prof. Lyubomir Penev.

Visit the BgBOL website and follow the network on LinkedIn and Facebook, where you might also want to join the BgBOL Facebook group!

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About the International Barcode of Life:

The International Barcode of Life Consortium is a research alliance undertaking the largest global biodiversity science initiative: create a digital identification system for life that is accessible to everyone.

iBOL is working to establish an Earth observation system that will discover species, reveal their interactions, and establish biodiversity baselines. The consortium is tracking ecosystems across the planet and exploring symbiomes – the distinct fungal, plant, and animal species associated with host organisms. Our goal is to complete this research and establish baseline data for science and society’s benefit.