Category: Nature Conservation

Do squirrels teach bears to cross the railroad? Grizzlies dig squirrel middens for grains

Grains have been reported to regularly trickle from hopper cars travelling via the railway located within the Canadian Banff and Yoho National Parks, attracting the local red squirrels.

As a result, the rodents have grown used to foraging on the spilled seeds, which they collect in underground storage areas where they can be discovered and dug up by grizzly bears. Grain-conditioned bears may frequent the railway more often than usual, resulting in increased mortality by trains strikes.

Furthermore, the dispersal, following caching and digestion of such seeds by both squirrels and bears, could lead to the spread and establishment of those agricultural plants in the area.

The case is investigated and discussed by members of the University of Alberta‘s research team of Julia Elizabeth Put, Laurens Put and Dr. Colleen Cassady St. Clair. Their study is published in the open access journal Nature Conservation.

It all began when members of the team found a grain-filled midden that was visited by a bear near where the same bear had bluff-charged Parks Canada employees. At the time, the researchers were investigating possible explanations for causes of grizzly bear mortality on the adjacent railway. Thus, an unexpected opportunity to document interactions between species and how those can lead to human-wildlife conflicts presented itself to the scientists.

The three basic questions brought up by Julia and her team were whether spilled grain could increase the number of squirrels near the rail; if other middens contained grain; and if other bears accessed grain in middens. Eventually, their data provided a resounding ‘yes’ to all of them.

In some mountain parks in North America, including Banff, grizzly bears are known to excavate squirrel middens to access whitebark pine seeds. The tree, however, is only found at high elevations far from the valley bottom where the railway is located. Nevertheless, this behaviour may easily translate to targeting other food items in middens, such as grain, speculate the researchers.

Once a bear consumes grain from a squirrel midden, it could initiate or reinforce a tendency to seek grain on the rail, where it is generally less concentrated. Such conditioning of food rewards could lead to grizzly bears spending more time in the area around or on the rails, where they would be at risk of being struck by trains.

“The only feasible mitigation for these effects is to reduce spillage from hopper cars via careful attention to loading and gate maintenance,” conclude the authors.

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Original source:

Put JE, Put L, St. Clair CC (2017) Caching behaviour by red squirrels may contribute to food conditioning of grizzly bears. Nature Conservation 21: 1-14. https://doi.org/10.3897/natureconservation.21.12429

Claims that declines of pollinator species richness are slowing down in Europe revisited

Having conducted a thorough interpretation of the results of a recent study that inferred decrease in the biodiversity loss among pollinators across Europe, Dr Tom J. M. Van Dooren reveals that this conclusion cannot in fact be drawn. It is only supported for the bee fauna in the Netherlands. His study is published in the open access journal Nature Conservation.

Changes in pollinator abundances and diversity are of major concern. Pollinator diversity is quantified by their species richness: the number of species from a specific taxonomic group of pollinating animals present at a given time in a given area. A recent study, adopted in the recent UN IPBES Pollination Report draft summary, inferred that pollinator species richnesses are decreasing more slowly in recent decades in several taxonomic groups and European countries.

However, Dr Tom J. M. Van Dooren, affiliated with both Naturalis Biodiversity Center, the Netherlands, and the Institute of Ecology and Environmental Sciences of Paris, France, has now published his own study to show in detail the inaccuracies that the earlier conclusion has been based on.

Among other points, the scientist notes that the earlier study contained no explicit statistical comparisons between species richness changes in different periods. The earlier study also treated richness changes at country level and small spatial resolution as equivalent, while they probably represent different processes.

“Plants in Great Britain at the smallest spatial scales suggest a reduced rate of changes, but the results for larger spatial scales are not significant,” he illustrates. “The same holds for butterflies in the Netherlands.”

Dr Tom J. M. Van Dooren only finds support in the results of the earlier publication for a decelerating decline in bumblebees and other wild bees in the Netherlands. “This is in fact one taxon, the bees Anthophila, in a single country, the Netherlands”, he notes.

“The lack of robustness points again to the possibility that results found in the data can be due to changes in the shapes of species accumulation curves,” Dr Tom J. M. Van Dooren summarises. “Therefore the status of the statement on decelerating declines in the Pollination Report should be adjusted accordingly.”

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Original source:

Van Dooren TJM (2016) Pollinator species richness: Are the declines slowing down? Nature Conservation 15: 11-22. doi: 10.3897/natureconservation.15.9616

Photo credit:

Aiwok, Wikimedia Commons, CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)

Online sales of threatened cacti point to the Internet as an open door for illegal trade

International trade of wildlife on the Internet is highly unregulated and has become a threat for species survival. Threatened cacti are available on websites and shipped across countries without any legal documents to certify their trade is not a menace to population viability in the wild. Is this ignorance or unwillingness to comply with regulations? Study published in the open access journal Nature Conservation reports on the activity and discusses assessment methods and solutions.

In present days, trade of species is possible without any real human interaction, and distance is no longer an obstacle. Although conventional trade routes are maintained through shipping of goods, the widespread use and the unregulated nature of the Internet make e-commerce a great concern to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

This convention regulates international trade through issuing and control of permits, which aim to guarantee that the trade of individuals is not a threat to the survival of a species in the wild. Due to the magnitude of the international trade, the entire cacti family is under CITES.

In their study, scientists Vania Olmos-Lau and Dr María C. Mandujano, both affiliated with the Universidad Nacional Autónoma de México (UNAM), México, present a quick and easy method to assess the online availability of a highly collectible Mexican threatened cactus, commonly known as disc cactus. The method can be readily used to assess other species.

Because of its threatened status, no commercial trade of wild specimens is allowed and a collection permit is needed for harvest of seeds and individuals. Plants and seeds were found available in major online markets like eBay and Amazon, and were also offered via online stores based in the USA, France, Germany, Australia, the Czech Republic, the UK, and others. Researchers point out that the Asian market was underestimated due to language constraints.

Only a minority of these online stores openly stated that they would provide CITES documentation, or that plants were obtained from nurseries that grew cacti themselves. Results also indicate that the country home to this species, Mexico, plays no important role in the legal international trade of the species.

“This method is easily transferable to estimate the illegal market for any species and offers an understanding of the real magnitude and main targets of this new form of threat,” note the authors. “Compliance or other regulation mechanisms are needed in order to promote species conservation.”

For major online stores like eBay, Mercado Libre and Amazon, the researchers propose a policy based on filtering the publications which contain the name of CITES species.

For example, there could be downloadable forms for the sellers to sign and prove that they assume responsibility for the legal origin of the product. Also, a pop up window could let buyers know what a CITES species is and what its acquisition involves. After all, most times the lack of compliance with regulations for wildlife trade is a matter of ignorance rather than disobedience.

“We need to open our eyes to the demand for wildlife and how it can be satisfied through fair trade schemes that benefit local landowners,” point out the researchers.

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Original source:

Olmos-Lau VR, Mandujano MC (2016) An open door for illegal trade: online sale of Strombocactus disciformis (Cactaceae). Nature Conservation 15: 1-9. doi: 10.3897/natureconservation.15.8259

Thousands of illegally traded wild animals at risk due to gaps in data

The fate of over 64,000 live wild animals officially reported to have been confiscated by CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) enforcement agencies between 2010 and 2014 remains untraceable, according to a new report released by the University of Oxford Wildlife Conservation Research Unit (WildCRU) and World Animal Protection.

In their publication in the open access journal Nature Conservation, the researchers document merely one in three partnering to CITES countries providing any data on seizures, and also highlight the importance of having this changed.

Although the reported number of confiscated animals is staggering, the researchers warn that these are likely to be only a fraction of the actual seizures. The study found two out of three countries did not report any live wildlife seizures, despite poaching of endangered species and supplying the illicit global wildlife trade being estimated to be worth between $8-10 billion per year.

The figures have prompted calls for better reporting of seizures and what happens to confiscated live wild animals.

The ultimate fate of seized live wild animals is unknown, the researchers found. Once animals have been confiscated, national authorities must decide whether to: keep them in captivity, return them to the wild or euthanize them. CITES provides guidelines to aid this decision-making based on the conservation status and welfare needs of the animals.

However, information about the fate of these wild animals is not a formal CITES requirement and as a result, there are no official numbers on just how many were euthanized, placed in captivity or returned to the wild.

Researchers are concerned this lack of data is placing the well-being and survival of seized wildlife at risk – many wild animals could be re-entering the wildlife trafficking industry as they simply can’t be accounted for.

University of Oxford‘s Professor David Macdonald, senior researcher for the study, said:

“We fear this staggering number is just the tip of the iceberg. Only a relatively small proportion of wild animals involved with illegal trade are thought to be intercepted by enforcement agencies – confiscation records were completely missing for 70% of countries Party to CITES. Given the rapidly growing global trends in illegal wildlife trade activity, it is highly unlikely that no live wildlife seizures were made on their borders.

“The records that were provided show that around 20% of all live wild animals reported as seized are currently considered to be threatened by extinction. We strongly recommend that the CITES trade database should include information on the fate of all live wild animal seizures, so we know what happens to these animals, and we can reduce the risk of them re-entering the illegal wildlife trade.”

World Animal Protection’s Dr Neil D’Cruze, lead researcher for the study, said:

“The illegal wildlife trade is a big, complex and dirty business. National authorities play a key role, facing some tough choices when they seize animals – whether they release them in the wild, place them in care in captivity or euthanize them.

“Improved data recording is critical to knowing what happens to each animal, and can help in looking at the challenges and issues enforcement agencies face in managing animals after seizure. Without this transparency, there’s a real possibility that endangered species may be put back into the hands of the same criminals whom they were taken from. We need to be able to account for these wild animals.

“If we’re really serious about protecting wildlife, action needs to be taken at all levels. It’s unfathomable that 70% of countries recorded no seizures when we know a global, multi-billion wildlife trafficking industry is flourishing.”

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The findings and recommendations of this research were presented at the 17th meeting of the Conference of the Parties (CoP) in Johannesburg, South Africa on 27 September 2016 during a side event focused on the confiscation of live wild animals organised by the Species Survival Network (SSN).

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Original source:

Citation: D’Cruze N, Macdonald DW (2016) A review of global trends in CITES live wildlife confiscations. Nature Conservation 15: 47-63. doi: 10.3897/natureconservation.15.10005

Being systematic about the unknown: Grid-based schemes could improve butterfly monitoring

Butterfly monitoring schemes are at the heart of citizen science, with the general public and researchers collaborating to discover how butterfly populations change over time. To develop the concept further, a new paper in the journal Nature Conservation shows how systematically placed, grid-based transects can help schemes by reducing habitat bias.

Rapidly increasing in number and popularity, Butterfly Monitoring Schemes have proved to be a method generating important, high-resolution data. Reliant on enthusiastic volunteers, who record butterflies along freely chosen transects, the collected observations are then used to explore and understand trends in butterfly numbers and distributions.

However, there is a risk associated with free site selection: some habitats can become underrepresented and monitoring results therefore less general than intended.

Butterfly hot-spots, such as semi-natural grasslands, tend to be favoured over less well-known environments. This means that butterflies living in other ‘less popular’ habitats, such as forests and wetlands, are covered less thoroughly and population declines of these species risk going undetected.

A team of Swedish researchers have now investigated the potential of a new, complimentary grid-based design, where butterfly recorders are to walk systematically placed transects across the country.

The results of testing the new method showed that butterflies were abundant in traditionally overlooked habitats such as coniferous forests, bogs, and clear-cuts. Additionally, the systematic transects also performed well in avoiding habitat bias.

“Butterfly Monitoring Schemes are likely to benefit from adding grid-based butterfly transects as a complement to free site choice designs,” explains Dr. Lars B. Pettersson from Lund University. “Free and systematic site selection should not be seen as mutually exclusive, instead they can be used together to ensure high quality and inclusiveness of data for better assessing of future biodiversity trends.”

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Additional information:

This work has been carried out within the EU project STEP (FP7 grant 244090-STEP-CP-FP) and the Swedish Butterfly Monitoring Scheme (Swedish EPA contract 2227-13-003). It is part of the strategic research area Biodiversity and Ecosystems in a Changing Climate, BECC.