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首页> 外文期刊>Brazilian Journal of Oceanography >Temporal variation of sandy beach macrofauna at two sites with distinct environmental conditions on Cassino Beach, extreme southern Brazil
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Temporal variation of sandy beach macrofauna at two sites with distinct environmental conditions on Cassino Beach, extreme southern Brazil

机译：在巴西极端南部的卡西诺海滩，两个环境条件不同的地点的沙滩大型动物的时间变化

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摘要

Temporal variations of the macrofauna of sandy beaches have been related to variations in the beach morphodynamics and also to the population dynamics of dominant species. The aim of this article is to describe the temporal variation of the intertidal macrofauna at two sites with distinct environmental condition on Cassino Beach, extreme southern Brazil. At each site three transect lines 50 m apart were defined perpendicular to the shore line, from which samples were collected monthly in triplicate at 4 intertidal levels (10 m apart) from June 2004 to May 2005. During winter a generally low density was observed, due to the absence of recruitments and to the mud deposition, which occurred just before sampling (in April 2004), and to low intensity stranding events. Spring witnessed a population explosion of Scolelepis gaucha, a migration of Mesodesma mactroides adults from the subtidal zone, and a strong stranding event. In the summer, recruitment of M. mactroides, Donax hanleyanus and Emerita brasiliensis was observed. Fall was characterized by low densities, except for D. hanleyanus recruitment. The macrofauna at both sites showed a striking seasonal variation in density and diversity, perhaps attributable to the recruitment of numerically dominant species and physical disturbances (stranding and mud deposition).
机译：沙滩大型动物的时间变化与沙滩形态动力学的变化以及优势物种的种群动态有关。本文的目的是描述巴西南部极端的卡西诺海滩上两个环境条件不同的潮间带大型动物的时间变化。从2004年6月至2005年5月，在每个站点垂直于海岸线定义了三个相距50 m的横断面线，每个月三次以4个潮间水平（相距10 m）一式三份收集样本。冬季，密度通常较低，由于在采样之前（2004年4月）就没有招募人员和泥浆淤积，以及低强度的搁浅事件。春季目睹了Scolelepis gaucha的种群爆炸，潮间带的食蝇中线成虫的迁徙以及强烈的搁浅事件。在夏季，观察到了M. mactroides，Donax hanleyanus和Emerita brasiliensis的募集。秋季的特点是密度低，除了汉氏D虫的募集。两个地点的大型动物都表现出密度和多样性的明显季节性变化，这可能归因于数量优势物种的募集和物理干扰（搁浅和泥沙沉积）。

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