Eurasian eagle owl diet plan exposes brand-new records of threatened huge bush-crickets


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IMAGE: Male specimen of the Big-Bellied Glandular Bush-Cricket (Bradyporus macrogaster).
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Credit: Dragan Chobanov

Bird diet plans supply a genuine treasure for research study into the circulation and preservation of their victim, such as neglected and uncommon bush-cricket types, explain researchers after studying the diet plan of the Eurasian Eagle Owl (Bubo bubo) in southeastern Bulgaria.

In their paper, released in the open-access, peer-reviewed journal Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa”, Dr Dragan Chobanov (Institute of Biodiversity and Ecosystem Research, Bulgaria) and Dr Boyan Milchev (University of Forestry, Bulgaria) report the regular existence of the threatened with termination Big-Bellied Glandular Bush-Cricket (Bradyporus macrogaster) in the diet plan of Eurasian Eagle Owls, and conclude that the predatory bird might be utilized to determine biodiversity-rich locations in requirement of security.

While the Balkan Peninsula has actually currently been identified as the location with the greatest variety of orthopterans (insects, crickets and bush-crickets) in Europe and among the usually many biologically varied locations in the entire Palearctic world, it is likewise house to a stressing variety of threatened types. Furthermore, a comprehensive and upgraded nation evaluation of the preservation status of the orthopterans discovered in Bulgaria is presently doing not have. This is why the Bulgarian group carried out a research study on the biodiversity of these bugs by evaluating food stays from pellets of Eurasian Eagle Owls, gathered from 53 reproducing websites in southeastern Bulgaria.

As an outcome, the researchers reported 3 types of bush crickets that have actually ended up being a substantial part of the diet plan of the studied predatory birds. Oddly enough, all 3 types are uncommon or threatened in Bulgaria. The case of the Big-Bellied Glandular Bush-Cricket is of unique issue, as it is a types threatened by termination. On the other hand, the regional decrease in mammals and birds that weigh in between 0.2 and 1.9 kg, which remain in truth the favored victim for the Eurasian Eagle Owl, has actually led the extremely opportunistic predator to progressively look for big bugs for food. The scientists even think that there may be more neglected types drawing in the owls.

Taking into consideration the thus reported interconnected reasonings of preservation issue, along with the vulnerability of the Big-Bellied Glandular Bush-Cricket, a types with an important function in the food cycle, the researchers require the freshly offered information to trigger the classification of a brand-new Natura 2000 website. Furthermore, due to the types’ requirements for environments of low disruption and high plant life variety, and its plus size and simple area through singing males, they explain that it makes an ideal sign for environment quality and types neighborhood health.

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Initial source:

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Chobanov D, Milchev B (2020) Orthopterans (Insecta: Orthoptera) of preservation worth in the Eurasian Eagle Owl Bubo bubo food in Bulgaria. Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 63( 2 ): 161-167. https://doi.org/10.3897/travaux.63.e53867 .

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