Local patterns of distribution and resource utilization of four bat species (Myotis brandti, Eptesicus nilssoni, Plecotus auritusandPipistrellus pipistrellus) in patchy and continuous environments

Journal of Zoology - Tập 238 Số 3 - Trang 571-580 - 1996
Martin Ekman1, Johnny de Jong1
1Department of Wildlife Ecology, Box 7002, 750 07 Uppsala, Sweden

Tóm tắt

The local patterns of distribution and resource utilization of four bat species (Myotis brandti, Eptesicus nilssoni, Plecotus auritusandPipistrellus pipistrellus) were examined in patchy and continuous environments, using bat detectors. The effects of two different kinds of open matrix habitats (crop‐fields and water) on species occurrence were compared in the patchy areas. A crop‐field matrix seemed to have a greater negative influence on species occurrence than a water matrix. Presence and absence of species in the patchy areas were analysed against island area, area of some habitats, and isolation. All species were positively affected by one or more forest habitat parameters. Two species (M. brandtiandP. auritus) were negatively affected by isolation, which suggests that they may be particularly vulnerable to increased forest patchiness. These species occurred mainly on large islands. Two hypotheses that might explain the habit of open area avoidance inM. brandtiandP. aurituswere tested: 1. Insect abundance hypothesis; 2. Foraging behaviour hypothesis. Both failed to explain why these two species avoid open habitats and as a consequence are negatively affected by isolation.

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Journal of Zoology

Tập 238 Số 3

571-580

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