Seasonal variations in the diversity, abundance, and composition of species in an estuarine fish community in the Tropical Eastern Pacific, Mexico
Seasonal variations in the diversity, abundance, and composition of species in an estuarine fish community in the Tropical Eastern Pacific, Mexico
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DOI：
10.1007/s10228-009-0102-5
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发表时间：
2009-03
影响因子：
1.2
通讯作者：
E. Mendoza;M. Castillo-Rivera;Rocío Zárate-Hernández;Selene Ortiz-Burgos
中科院分区：
文献类型：
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作者：
E. Mendoza;M. Castillo-Rivera;Rocío Zárate-Hernández;Selene Ortiz-Burgos
在墨西哥西部瓦哈卡墨西哥州的查卡瓦泻湖的鱼类区系每2个月取样一次，使用拖网超过7个采样周期。河口在1月下旬关闭，在系统中产生高盐条件。共记录到33种，隶属于20个科;其中大多数是海洋物种，显示出热带和亚热带的亲缘关系。最丰富的种类是秘鲁镖鲈、刺鲷、大鳞鳀、小鲈和新带笛鲷。总的鱼类丰度和物种丰富度没有显着影响的口关闭，这是一个永久开放的入口通道与相邻的泻湖，这使得这两个系统之间的鱼容易交换的存在。典范对应分析（CCA）显示，盐度和溶解氧是最重要的环境变量，在确定所观察到的鱼类群落组成的变化。有两种鱼很明显：低盐度期（开口期）的鱼类组合，主要为Currani真口鱼、瓜地雅鱼、棘棘口鱼、黄脊棘鱼和犬鲹;高盐度期（闭口期）的鱼类组合，主要为大鳞鲀、滑鳍鲑和青鳞鱼。多变量分析表明，这两个时期之间的鱼类群落的组成的差异。其他物种，如永久居民D. peruvianusandC. robalito，表现出最大的环境盐度耐受范围，在这两个时期都被捕获。鱼类种群的季节性演替可能与适应生态条件的物种在生活史和环境耐受性方面的差异有关。
The ichthyofauna of the Chacahua Lagoon in the western Oaxaca State of Mexico was sampled every 2 months, using a trawl net over seven sampling cycles. The estuary mouth closed in late January, generating hypersaline conditions in the system. A total of 33 species belonging to 20 families were recorded; most of them marine species, showing tropical and subtropical affinities. The most abundant species wereDiapterus peruvianus,Centropomus robalito,Anchovia macrolepidota,Lile stolifera, andLutjanus novemfasciatus. Total fish abundance and species richness were not significantly affected by the mouth closing, and this was related to the presence of a permanently open entrance channel with an adjacent lagoon, which allowed easy exchange of fish between these two systems. Canonical correspondence analysis (CCA) revealed that salinity and dissolved oxygen were the most important environmental variables in determining the observed variability in fish community composition. Two fish groups were evident: the fish assemblage of the low-salinity period (open-mouth phase), in whichEucinostomus currani,Sciades guatemalensis,Centropomus armatus,Citharichthys stigmaeus, andCaranx caninusconstituted the majority of the catch; and the fish assemblage of the high-salinity period (closed-mouth phase), withA. macrolepidota,L. stolifera, andHarengula thrissinaas the most abundant species. Multivariate analyses showed differences in the composition of the fish community between both periods. Other species, such as the permanent residentsD. peruvianusandC. robalito, which showed the widest range in tolerance of ambient salinity, were caught during both periods. Seasonal succession of fish populations may be related to differences in life cycle and tolerance of the environment among those species adapting to ecological conditions.