Padrões de coexistência e utilização do hábitat por duas espécies de Herpsilochmus (Aves: Thamnophilidae)
How ecologically similar species are able to coexist has always generated great interest in the scientific community. Classical niche theory predicts that species coexistence is only possible when they segregate in at least one dimension of the ecological niche, thus leading to ecological differe...
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| Formato: | Dissertação |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/14041 |
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| Resumo: | How ecologically similar species are able to coexist has always generated great interest in the
scientific community. Classical niche theory predicts that species coexistence is only possible
when they segregate in at least one dimension of the ecological niche, thus leading to
ecological differentiation among species. However, recent work has shown that species that
are more similar in some ecological traits are the ones more prone to be able to coexist
(environmental filter). The knowledge of how these forces act shaping ecological
communities can reveal co-existence strategies, providing important information for
management and conservation of the species. This study tested these hypotheses using a pair
of coexisting species of Herpsilochmus, H. pectoralis and H. sellowi. In this study I use high
resolution (50 x 50 m) ecological niche models to Identify which environmental factors best
predict species occurrence. Next, I calculate the overlap in habitat use by species and build
null models to test the hypothesis of spatial niche segregation. In addition, I obtain the
selectivity parameters of habitat use to test whether the species H. pectoralis (larger body
size) is less selective than H. sellowi (smaller body size) as stated in the literature for other
species. The results reject the ecological equivalence among species, revealing that the
species of Herpsilochmus explore the habitat differently, having different environmental
niches. The hypothesis of environmental filter was not observed in my analysis, the observed
overlap in habitat use among species was lower than expected by chance. Evidence that
Herpsilochmus are spatially segregating reinforces the hypothesis of interspecific competition
as the predominant force in the selection of microhabitat of the species. However, more data
and experiments are necessary to state categorically that the observed pattern is a result of
current or past competition |
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