Atividade de morcegos insetívoros aéreos em relação a diferentes escalas temporais de luminosidade lunar
It is commonly assumed that aerial insectivorous bats might respond to moonlight intensity by decreasing their foraging activity during bright nights due to the inherent predation risk increase of due to the lower insect availability. The effect of moonlight can be measured among nights and withi...
| Autor principal: | Appel, Giulliana |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12038 http://lattes.cnpq.br/5838492459298259 |
| Resumo: |
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It is commonly assumed that aerial insectivorous bats might respond to moonlight
intensity by decreasing their foraging activity during bright nights due to the inherent
predation risk increase of due to the lower insect availability. The effect of moonlight
can be measured among nights and within a night. However, only few studies
synchronously involve both approaches and most authors essentially compare bat
activity with lunar phases. Our main aim was to evaluate how the moonlight influences
aerial insectivorous bat activity at different time scales: between nights (bright and dark
nights and wide range of moonlight intensity) and within the same night. Bat activity
from five species was calculated using autonomous ultrasound recording stations and
moonlight intensity percentages retrieved from Moontool program. Bat activity was
calculated per species per night during a 53-day sampling period. Bat activity was also
assessed hourly in a gradient of different moonlight intensity nights. Only one species
(Myotis riparius) positively responded to moonlight, while two species (Pteronotus
parnellii e Saccopteryx leptura) increased their foraging activity and other two did not
respond (Cormura brevirostris and S. bilineata). Bat activity was for all the species
greater at the beginning of the night independently of the moon presence, indicating that
foraging just after the sunset is essential. The response of bats to the effects of
moonlight intensity is more apparent between nights than within a single night and
might depend on particular traits of each species such as flight speed, flexibility in
habitat use and body size. |