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Food of the otter ( Lutra lutra ) on the Somerset levels

Food of the otter ( Lutra lutra ) on the Somerset levels the Kestrel (Fulco tinnunculus) and the Sparrow-hawk (Accipiter nisus); elsewhere both are known to take bats occasionally. The Sparrow-hawk appears to be much less common than it was in Madeira (Bannerman & Bannerman, 1965)-we did not see it there at all in 1971. Its recent decline may well be due to the use of organochlorine insecticides on agricultural land as in Britain. The Kestrel is a much commoner species on the island; we saw it in six different localities between March 13 and 19 1971. The differences between the avifaunas of Madeira and the Azores suggests that the diurnal behaviour of the Azorean bat may be due to the absence of avian competitors or predators in the Azores. The Common swift (Apus upus), the Swallow, the House martin (Delichon urbicu), and the Kestrel have all been recorded from the Azores as stragglers. If any of them or other swifts, hirundines, hawks or falcons should colonize the island in the future it would be most interesting to see if this resulted in the Azorean bat becoming nocturnal. Meanwhile observations on the flight times of Leisler’s bat in relation to avifaunas elsewhere might throw light on the problem. My thanks http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Zoology Wiley

Food of the otter ( Lutra lutra ) on the Somerset levels

Webb, Jean B.
Journal of Zoology , Volume 177 (4) – Dec 1, 1975
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References (7)

Publisher
Wiley
Copyright
Copyright © 1975 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0952-8369
eISSN
1469-7998
DOI
10.1111/j.1469-7998.1975.tb02249.x
Publisher site
See Article on Publisher Site

Abstract

the Kestrel (Fulco tinnunculus) and the Sparrow-hawk (Accipiter nisus); elsewhere both are known to take bats occasionally. The Sparrow-hawk appears to be much less common than it was in Madeira (Bannerman & Bannerman, 1965)-we did not see it there at all in 1971. Its recent decline may well be due to the use of organochlorine insecticides on agricultural land as in Britain. The Kestrel is a much commoner species on the island; we saw it in six different localities between March 13 and 19 1971. The differences between the avifaunas of Madeira and the Azores suggests that the diurnal behaviour of the Azorean bat may be due to the absence of avian competitors or predators in the Azores. The Common swift (Apus upus), the Swallow, the House martin (Delichon urbicu), and the Kestrel have all been recorded from the Azores as stragglers. If any of them or other swifts, hirundines, hawks or falcons should colonize the island in the future it would be most interesting to see if this resulted in the Azorean bat becoming nocturnal. Meanwhile observations on the flight times of Leisler’s bat in relation to avifaunas elsewhere might throw light on the problem. My thanks

Journal

Journal of Zoology – Wiley

Published: Dec 1, 1975

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