Fatores que afetam o padrão de muda de penas em Passeriformes em uma área de restinga no Nordeste do Brasil
Feather molting in birds is a process that occurs naturally every year due to plumage wear. For it to occur, a large amount of energy is required, so it does not usually coincide with other events in the bird's life cycle such as breeding and migration. It is common for the moulting period t...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47602 |
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| Resumo: | Feather molting in birds is a process that occurs naturally every year due to plumage wear.
For it to occur, a large amount of energy is required, so it does not usually coincide with
other events in the bird's life cycle such as breeding and migration. It is common for the
moulting period to occur at a time of year when there is a greater supply of food. Factors
such as primary productivity of the region and rainfall can directly affect resource
availability. The order Passerines is the largest order of the bird group, and several
ornithological studies are carried out with representatives of this group due to its great
diversity. Our study was carried out with passerines from a sandbank area, typical
vegetation of the Atlantic Rainforest, which houses peculiar vegetal formations where
little is known about its avifauna. Based on this, we sought to understand whether there
is overlap between the moulting period and breeding, and whether there are differences
in the moulting patterns due to differences in the diets of these passerines. We used a
database of bird captures in a sandbank area, Parnamirim, RN formed between 2010 and
2014. We counted presence or absence of wing, tail and body molt and simultaneous
wing, tail and body molt. We also counted presence or absence of brood patch. We
separated the species into four diet groups: fruit, invertebrate, invertebrate/fruit, and
omnivorous. We ran GLM models to analyze which variable best explained the variation
in moult frequency, and linear regressions to analyze the relationship between moulting
and the variables studied. Our results showed that the best variable that explained the
variation in moult frequency was NDVI, as a temporal variable, and the moult frequency
was different between flight feathers (rems and retrizes) and body feathers, and these
types of moults configured the most explanatory biological variable. We also saw that the
different diets did not influence the moulting frequency, and that the weak overlap found
between the moulting period and reproduction occurs only at the boundary between the
periods, since the peak of reproduction occurs in February and the peak of the moulting
period occurs in May. |
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