Diel density variation of amphipods associated with Sargassum beds from two shores of Ubatuba, Southeastern, Brazil

Iheringia. Série Zoologia

Fosca P. P. Leite²  Marcel O. Tanaka¹  Daniela B. Sudatti²  Raquel S. Gebara² 

[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de ZoologiaCampinas SP ,Brazil

关键词: Diel variation;    amphipods;    Sargassum;    Variação temporal;    anfípodos;    Sargassum;   

DOI  :  10.1590/S0073-47212007000400007

来源: SciELO

【 摘 要 】

Densities of mobile epifaunal assemblages associated with macrophytes are very variable during the day and the activity of visually-oriented predators is thought to have an important influence on this pattern. Here we compared densities of amphipods associated with a common brown alga, Sargassum stenophyllum (Phaeophyceae), at sites contrasting in water turbidity. We expected that diel variation of amphipods would occur in a shore with clear waters (Perequê), whereas no variation was expected in a shore with turbid waters (Lamberto). Amphipod density varied during the day at both shores, with no indication of a larger variation at Perequê. Most species showed two density peaks, one at night and the other in the afternoon. These peaks occurred close the times of high tide, suggesting that tidal rhythms could influence more amphipod densities than the activity of predators. Thus, more studies are necessary to understand factors that influence short-term variation of epifaunal assemblages.

【 授权许可】

CC BY   
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