Influência do método de amostragem nas estimativas de detecção e ocupação de peixes elétricos (Gymnotiformes) em igarapés da Reserva Ducke, Amazônia Central
Recording species occurrence is not always a simple task, because it is subject to flaws in the detection. Fishes of the Gymnotiformes can be difficult to detect, since they have nocturnal and cryptobiotic habits. On the other hand, gymnotiforms can send electrical signals, which can be detected...
| Autor principal: | Andrade, André Luiz Ramos Holanda de |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12040 http://lattes.cnpq.br/5689464953486506 |
| Resumo: |
|---|
|
Recording species occurrence is not always a simple task, because it is subject to flaws
in the detection. Fishes of the Gymnotiformes can be difficult to detect, since they have
nocturnal and cryptobiotic habits. On the other hand, gymnotiforms can send electrical signals,
which can be detected using electrical signal detectors. However, fish sampling rarely includes
the use of such detectors, which may underestimate its abundance and diversity. This study
compares probabilities of detection and habitat occupancy of Gymnotiformes in streams of
Ducke Reserve, Brazilian Amazon, from samplings with and without the use of electrical
detectors, and evaluates the influence of environmental variables on such probabilities. Single
species, single season models were employed, with model selection based on Akaike
Information Criterion. Samplings were done in 31 streams in 2005, 2006 (twice), 2011, and
2015 (twice). Electrical signal detector increased the probability of finding a gymnotiform by
nearly 10 times, which may strongly affect conclusions about species richness and species
composition in streams. The main factors interfering with gymnotiform detection were
substrate type and current velocity. We conclude that the use of electrical signal detector is of
foremost importance to generating accurate estimates of abundance of Gymnotiformes in
streams. |