Variação nictemeral na assembleia de peixes de um trecho de rio na Amazônia ocidental brasileira

Biotemas

Vanessa Martins Rocha²  Julia Myriam de Almeida Pereira²  Igor David Costa²  Wesclen Vilar Nogueira²  Paulo de Tarso Fonseca Albuquerque²  Rinaldo Antônio Ribeiro Ribeiro Filho¹ 

[1] Universidade Estadual Paulista Julio Mesquita Filho, Campus de Registro, Av. Nelson Brihi Badur, 430, Vila Tupy, CEP: 11.900-000, Registro �? SP, Brasil.;Fundação Universidade Federal de Rondônia, Campus Presidente Médici, Departamento de Engenharia de Pesca, Laboratório de Ciências Ambientais, Rua da Paz, 4376, CEP: 76.916-000, Presidente Médici - RO, Brasil.

关键词: Biomassa;    Ictiofauna;    Rio Machado;    Rondônia;    Segregação temporal;   

DOI  :  

学科分类：生物科学（综合）

来源: Universidade Federal de Santa Catarina * Centro de Ciencias Biologicas

【 摘 要 】

http://dx.doi.org/10.5007/2175-7925.2015v28n3p79Circadian activity patterns are among the most obvious and detectable biological rhythms in animals. This article aims to check the effects of nychthemeral variation on abundance, biomass, and composition of the ichthyofauna in the middle Machado River, Rondônia, Brazil. Collection took place at 9 sampling sites in Machado River, by means of fishing nets. We captured 1,320 specimens, belonging to 5 orders, 22 families, and 56 species, and total biomass of 689 kg. Characiformes had higher abundance and biomass in both periods; for nighttime, Siluriformes were the second most representative group in abundance. For nighttime, the biomass of Perciformes, Siluriformes, Clupeiformes, and Gymnotiformes were, in order, the higher. We emphasize the absence of temporal segregation in the biotope under study, but we highlight the contribution to abundance by the orders Perciformes and Siluriformes in using the environment at periods different from those cited in the literature. However, we point out that further sampling in both periods is required due to the occurrence of a small number of rare species unique to daytime (S = 12, 21%) and nighttime (S = 8, 14%). These results are significant to supplement the taxonomic inventories prior to the installation of large enterprises or environmental protection areas. alic'>seedlings.

【 授权许可】

Unknown