Data/hora: 09/06/2024 01:23:16

Provedor de dados: | 52
País: | Brazil
Título: | Diel Variations and Ecological Aspects in Fish Assemblages of a Sandy Beach in the Semi-Arid Region of Northeast Brazil.
Autores: | Dantas,Natália Carla Fernandes Medeiros; Silva Júnior,Carlos Antônio Beserra; Lippi,Daniel Lino; Feitosa,Caroline Vieira.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Demersal ichthyofauna; Density; Diversity; Total length; Day; Night.
Resumo: | ABSTRACT For the demersal fish that inhabit sandy beaches, the variation between day and night periods represents a determinant factor in their behavior, especially for species that live in shallow waters. This research aims at determining whether there are differences in the fish assemblage structure of the sandy beach of São Cristóvão, RN, Brazil, between diurnal and nocturnal periods. Samplings were carried out in 2011, during spring high tide period, with an otter trawl net. Dissimilarity between diurnal and nocturnal fish assemblages was confirmed by PERMANOVA results. No statistical differences were observed for richness and diversity of fish assemblage between day and night periods. The first and third order carnivores were the significantly more representative trophic categories during night and day periods, respectively. Only four species presented significant differences regarding total length of fish between the periods. The demersal fish assemblage of São Cristóvão beach presented variations in the density of individuals between day and night periods. Dissimilarities were also recorded in trophic categories and in total lengths of individuals; however this occurred as a result of the high density of some species. The low depth of the beach may prevent the establishment of larger size adult fish, thus becoming a favourable environment for juveniles and small-sized fish species.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100347
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/1678-4324-2016160076
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.59 2016
Fonte: | info:eu-repo/semantics/openAccess