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Träfflista för sökning "WFRF:(Seamark C) "

Search: WFRF:(Seamark C)

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  • Rydell, Jens, et al. (author)
  • Bat selfies : photographic surveys of flying bats
  • 2022
  • In: Mammalian Biology. - : Springer Science and Business Media LLC. - 1616-5047 .- 1618-1476. ; 102:3, s. 793-809
  • Journal article (peer-reviewed)abstract
    • The recent pandemic and other environmental concerns have resulted in restrictions on research and surveys involving capture and handling bats. While acoustic surveys have been widely used as an alternative survey method, in this study, we show how photographic surveys can offer an important contribution to study and survey bats. We outline approaches, using high speed flash and automated trip beams to obtain photos of flying bats of sufficient quality for reliable identification of species. We show, through a series of examples of setups and photographs, that photography is effective for surveying bats at a variety of sites, where bats roost, drink, and forage. We note, however, that photographic surveys cannot replace capture in all situations. In addition, although photographing bats is less invasive than capturing them, it can involve disturbance, so we stress the importance of minimizing the impact of such operations on bats.
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3.
  • Rydell, J., et al. (author)
  • White and clear wings in bats (Chiroptera)
  • 2020
  • In: Canadian Journal of Zoology. - : Canadian Science Publishing. - 0008-4301 .- 1480-3283. ; 98:2, s. 149-156
  • Journal article (peer-reviewed)abstract
    • White or clear (“whitish”) wings are a distinct feature in about 30 species of tropical insectivorous bats (Mammalia: Chiroptera) belonging to three families (Emballonuridae, Molossidae, and Vespertilionidae). Such wings may provide camouflage against the sky at dusk and dawn, when bats commute to and from the roost and are vulnerable to aerial predation from birds. We tested this hypothesis by comparing the contrast of black, white, and transparent plastic models against the evening sky. Compared with normally dark wings, white and particularly transparent wings indeed reduce the contrast against the sky and may also prevent overheating in bats flying in daylight. Whitish wings could facilitate earlier evening emergence and later morning return, increasing access to crepuscular or diurnal insects as food. But whitish wings become maladaptive near artificial lights, where they are highly visible when illuminated against the dark sky. Pale but colored (not whitish) wings and reticulated patterns on translucent wings in some African and south Asian bats may be variations on the same theme, functional as camouflage against a lit background of vegetation and shades.
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