Changes in numbers and reproductive status of bats during swarming in Natura 2000 site PLH080003 "Nietoperek", Poland [O]
Justyna Błesznowska , Ewa Kwasiborska , Tomasz Marszałek , Tomasz Kokurewicz , Anita Glover , John Haddow , Grzegorz Apoznański
AbstractA study of swarming activity at Nietoperek, Poland, was carried out from 6 August to 30 September 2014 and 13 August to 9 October 2015. Altogether 32 nights of mist netting (4 session per year x 4 nights each) was performed for both swarming seasons. To minimise the impact of disturbance on the results the netting was carried out on alternate nights near two entrances to the underground system. The netting period in the second season was changed by a week to ensure the whole swarming period was covered. In total 3265 bats from 13 species were caught, marked by fur clipping, sexed, aged, weighed, forearm length measured, and reproductive status recorded. The number and species composition differed significantly between both netting sites located only 4 km apart. In both netting sites no re-trapped individuals were recorded, indicating near-nightly changes of population at the swarming sites. On average 144 Bechstein's bats, Myotis bechsteinii, were caught per swarming season, while the largest number recorded hibernating underground has been only 48 individuals. This suggests that either "Nietoperek" is a stopover during migration, or there is a significant underestimation of wintering population of the species. Based on the largest number of caught individuals, the highest activity for B. barbastellus and M. bechsteinii was recorded in the first half of September, while for M. nattereri and P. auritus it was later in that month. In Daubenton's bat and mouse-eared bat two separate activity peaks were observed, which could indicate the presence of local and migratory populations swarming at different times. In Daubenton's bat there was significant positive correlation between the number of sexually active males and the average daily temperature, while in Natterer's bat negative correlation was found (rs=0.42 and rs= -0.46, n=32, P<0.05 respectively). Sexually active males aged 2–4 months were found in Daubenton's bat (n=58), Natterer's bat (n=7), Bechstein's bat (n=3), mouse-eared bat (n=29), barbastelle (n=3) and brown long-eared bat (n=1).
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|Book||Alberdi A., Garin I. (eds.), Aihartza J.: 14th European Bat Research Symposium - EBRS 2017 : Abstract book, 2017, ISBN 978-84-697-4575-5, 223 p.|
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