Habitat selection of the barbastelle bat (Barbastella barbastellus) during lactation in Sweden – preliminary results [P]
Tomasz Kokurewicz , Grzegorz Apoznański , Stefan Pettersson , Sonia Sánchez-Navarro , Jens Rydell
AbstractThe province of Halland in southwestern Sweden is a stronghold for the barbastelle bat in northern Europe. Bats (2 males and 8 females) were captured in mist nets, measured, weighed and checked for sex and reproductive status. LB-2X transmitters (0.32 g; Holohil Systems) were attached to them by using bonding adhesive (Torbot). Tagged bats were subsequently followed by three tracking teams during 13 consecutive nights (25 July - 7 August 2016) using three Australis 26k receivers with Y-3 antennae (Titley Electronics). We identified 47 feeding sites used by the bats, most of them located in or near pockets of mature deciduous woodland or wooded wetland including bogs and mires and, in a few cases, in stands of mature spruce trees. Many regularly used feeding sites were located 10-14 km west of the maternity roost, about 3 km on either side of the boundary between forest and open farmland to the west, and included several small isolated patches of woodland on open farmland. The bats freely crossed quite extensive (1-2 km) open areas, including crop fields, young spruce plantations and lakes on their commuting flights. Minimum convex polygons encompassing all fix points of the eight females and two males separately, showed that the females used an area of 64 km2 , while each of the two males used 11 km2 . Current practices for the conservation of barbastelles in Sweden and elsewhere in Europe are based on establishment of a protected zone around each known maternity colony. The suggested areas of the zones are based on radio-telemetry studies and vary from 2 km radius in Sweden to 7 km in England. In our case, this approach would be inefficient, regardless of chosen zone size, because most of the area used by the females and all of that used by the males would fall outside of the protected circle. We suggest that the conservation efforts should instead focus on the preservation and restoration of the remaining woodland patches maintaining a diverse tree species and age structure.
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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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