Iheringia. Série Zoologia | |
Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil | |
Luciano P. Das Neves1  Pedro De S. R. Da Silva1  Carlos E. Bemvenuti1  | |
[1] ,Fundação Universidade Federal do Rio GrandeRio Grande RS ,Brasil | |
关键词: Sandy beaches; benthic macrofauna; temporal variation; Cassino beach; Praias arenosas; macrofauna bentônica; variabilidade temporal; praia do Cassino; | |
DOI : 10.1590/S0073-47212008000100005 | |
来源: SciELO | |
【 摘 要 】
The temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil, was studied for a period of one year (June 2004 to May 2005) based on monthly sampling. Three sites were selected distant 50m from each other. At each site, 3 transects were established, 2m equidistant from one another. Each transect extended from the base of the primary dunes to the inner surf zone at approximately 1m in depth, with 7 or 8 sampling levels. Within transects, the distance between the levels was 20m until the upper swash zone, from which distance was 10m until the 1-meter isobath. The temporal variation in the abundance of benthic macrofauna observed in the present study can be attributed to (1) the positive effects of the recruitment peaks and migration of particular species to the swash zone and (2) negative effects of the migration of some species to deeper waters, as well (3) as mortality through natural causes (stranding and action of predators) and (4) human causes (harvesting and vehicle transit). We attribute the expressive abundance increase of benthic macrofauna to recruitment. The stranding, that is, the trapping of the organisms on the upper parts of the beach, is likely the main cause of abrupt drops in benthic macrofauna abundance.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
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