Temporal variation of amphipod assemblages associated with Sargassum filipendula (Phaeophyta) and its epiphytes in a subtropical shore |
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Authors: | Giuliano Buzá Jacobucci Marcel Okamoto Tanaka and Fosca Pedini Pereira Leite |
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Institution: | (1) Instituto de Biologia, Universidade Federal de Uberl?ndia, Uberl?ndia, MG, 38400-902, Brazil;(2) Departamento de Hidrobiologia, Universidade Federal de S?o Carlos, CP 676, S?o Carlos, SP, 13565-905, Brazil;(3) Departamento de Zoologia, Universidade Estadual de Campinas, CP 6109, Campinas, SP, 13083-970, Brazil |
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Abstract: | The phytal assemblages change in response to variation in biological and environmental conditions. In the present study, we
evaluated the temporal variation of amphipod assemblages associated with a Sargassum filipendula bed in a subtropical shore, in relation to variation of the host alga, its epiphytes and local environmental conditions.
Samples of S. filipendula with associated amphipods, water temperature, water movement and suspended solids were obtained monthly from June 2000 to
May 2001. We recorded 24 species of amphipods associated with S. filipendula. Species richness varied throughout the year, with maximum values in October 2000 and minimum in April 2001. Total amphipod
density gradually increased during the sampling period, with the highest value in March 2001. Amphipod diversity and evenness
were both positively influenced by epiphyte load and negatively by temperature, with higher values during summer months. Total
density and tube-builder density were also positively influenced by temperature, whereas nestler density was influenced by
epiphyte load. Individual amphipod species showed significant density fluctuations over the year. The canonical correspondence
analysis performed explained 88.2% of the variation, with a strong correlation of water movement, temperature and suspended
solids with the first axis, and a strong effect of epiphyte load on both the first and the second axes. The temporal structural
variation of the studied algal bed strongly influenced amphipod diversity and assemblage composition, possibly through direct
and indirect effects. |
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