Population dynamics of Trichodactylus borellianus (Crustacea Decapoda Brachyura) and interactions with the aquatic vegetation of the Parana River (South America, Argentina)
Population dynamics of Trichodactylus borellianus (Crustacea Decapoda Brachyura) and interactions with the aquatic vegetation of the Parana River (South America, Argentina)
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DOI：
10.1051/limn/2006001
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发表时间：
2006-01-01
影响因子：
1
通讯作者：
Williner, V
中科院分区：
文献类型：
--
作者：
Collins, PA;Giri, F;Williner, V
动物种群的波动与环境因素具有一定的同步性，对密度、性别比和补充有直接影响。 Trichodactylus borellianus 是一种常见的淡水蟹，属于木蹄科，原产于南美洲。这种螃蟹是杂食性的，以沿海群落为食。本研究首次分析了拉普拉塔盆地（阿根廷）淡水蟹的自然分布和种群动态及其与某些非生物和生物参数的关系。它是在巴拉那河漫滩的三个环境（溪流和河流的河流区域）中进行的。 2001 年 8 月至 2002 年 10 月期间每月对螃蟹种群进行采样。研究地点之间的平均螃蟹丰度存在显着差异。巴拉那河主河道周围环境的样本含量较低。螃蟹密度呈现两个高峰：冬末春初最高，夏末最低。雄性在冬末和春季的数量更为丰富。春季、夏季和秋季。人口呈现出传染性分布。冬季种群数量呈现规律性分布。仲春至中秋之前，幼虫非常常见，而成虫则在一年中的其余时间占主导地位。距离主河道最近的溪流中螃蟹的总数根据河流的水位和温度而变化。在位于巴拉那河主河道更前方的其他地点，螃蟹数量和植被生物量表现出更相似的排列，具有更高的相关性。
Animal population have a certain synchronization between their fluctuations and the environmental factors which have a direct influence on density, sex ratio and recruitment. Trichodactylus borellianus is a common freshwater crab of the Trichodactylidae family, originary front South America. This crab is omnivorous and grazes Upon the littoral communities. The present study is the first analysis of the natural distribution and population dynamics of freshwater crabs in La Plata Basin (Argentina) and their relationship with certain abiotic and biotic parameters. It was carried out in three environments (riverine zone of streams and river) of the Parana River floodplain. Crab populations were sampled monthly front August 2001 to October 2002. The mean crab abundance among the study sites Was significantly different. being lower in samples from the environment surrounding the principal channel of the Parana River. Crab density showed two peaks: the highest occurred during late winter and early spring, and the lowest during late summer. Males were only more abundant ill late winter and spring. In spring, summer and autumn. the population showed a contagious distribution. The population displayed a regular arrangement in winter. Front mid-spring to mid-autumn juveniles, were very frequent whereas adults predominated the rest of the year. Total crab number in the stream nearest to the main channel varied according to the level and temperature of the river. In the other sites, located further front the main channel of the Parana River, crab numbers and vegetation biomass showed a more similar arrangement with a higher correlation.