Morphological variation of freshwater crabs Zilchiopsiscollastinensis and Trichodactylusborellianus (Decapoda, Trichodactylidae) among localities from the middle Paraná River basin during different hydrological periods.
Morphological variation of freshwater crabs Zilchiopsiscollastinensis and Trichodactylusborellianus (Decapoda, Trichodactylidae) among localities from the middle Paraná River basin during different hydrological periods.
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DOI：
10.3897/zookeys.457.6726
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发表时间：
2014
期刊：
影响因子：
1.3
通讯作者：
Giri F
中科院分区：
文献类型：
--
作者：
Torres MV;Collins PA;Giri F
水文连通性已被广泛用于描述河流景观的空间联系。水文波动是调节其他环境变量的重要宏观因素，可以解释生物的分布和丰度。我们分析了两种淡水蟹（Zilchiopsis collastinensis和Trichodactylus borellianus）在当地水文制度的两个阶段在帕拉纳河流域中部地区的个体形态变化。在帕拉纳<e:1>河、萨拉迪略河、萨拉多河和科罗纳河的水位升降时采集标本。在每个地点记录电导率、pH值、温度和地理坐标。每只蟹的头胸背部分别用16个和14个标记来表示。典型变量分析显示，在两个水文阶段，从帕拉纳<e:1>和萨拉多河收集的螃蟹（两个物种）在形状上存在差异。我们没有发现蟹的形状在各个地方的一般分布格局。落水时，Zilchiopsis collastinensis的形状与经纬度梯度无关（即形状重叠较大），而升水时，形状则根据地理位置沿分布梯度排列。相反，在落水期间，borelliantrichodactylus的形状与经纬度有关，而在上升期间与分布梯度无关。总的来说，两种物种的头胸形状与环境变量没有统计学上显著的协变。这些结果表明，来自帕拉纳河中游不同地点的淡水蟹种之间保持着联系；然而，这些联系在洪泛平原系统的整个水文制度中都在变化。该研究有助于揭示不同地区蟹类形态在不同水文状态下的变化关系，并有助于估计河漫滩系统的联系和地理格局。
Measures of hydrologic connectivity have been used extensively to describe spatial connections in riverine landscapes. Hydrologic fluctuations constitute an important macrofactor that regulates other environmental variables and can explain the distribution and abundance of organisms. We analysed morphological variations among individuals of two freshwater crab species, Zilchiopsis collastinensis and Trichodactylus borellianus, from localities of the middle Paraná River basin during two phases of the local hydrological regime. Specimens were sampled at sites (localities) of Paraná River, Saladillo Stream, Salado River and Coronda River when water levels were falling and rising. The conductivity, pH, temperature and geographical coordinates were recorded at each site. The dorsal cephalothorax of each crab was represented using 16 landmarks for Zilchiopsis collastinensis and 14 landmarks for Trichodactylus borellianus. The Canonical Variate Analyses showed differences in shape (for both species) among the crabs collected from the Paraná and Salado Rivers during the two hydrologic phases. We did not find a general distribution pattern for shape among the crab localities. During falling water, the shapes of Zilchiopsis collastinensis were not related to latitude-longitude gradient (i.e., showing greater overlap in shape), while during rising water the shapes were ordered along a distributional gradient according to geographical location. Contrary, shapes of Trichodactylus borellianus were related to latitude-longitude during falling water and were not related to distributional gradient during rising water. The cephalothorax shape showed, in general, no statistically significant covariations with environmental variables for either species. These results show that each freshwater crab species, from different localities of the middle Paraná River, remain connected; however, these connections change throughout the hydrologic regime of the floodplain system. This study was useful for delineating how the relation among shapes of crabs of localities varies during two phases of the hydrological regime and for estimating the connections and geographical patterns in the floodplain system.
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影响因子：
2.5
作者：
Alibert, P;Moureau, B;David, B
通讯作者：
David, B
DOI：
10.1051/limn/2006001
发表时间：
2006-01-01
影响因子：
1
作者：
Collins, PA;Giri, F;Williner, V
通讯作者：
Williner, V
影响因子：
1.1
作者：
Giri, Federico;Loy, Anna
通讯作者：
Loy, Anna
影响因子：
1.1
作者：
Barria, Erwin M.;Sepulveda, Roger D.;Jara, Carlos G.
通讯作者：
Jara, Carlos G.
影响因子：
2.6
作者：
Gomes, L. C.;Bulla, C. K.;Miranda, L. E.
通讯作者：
Miranda, L. E.