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首页> 外文期刊>Reviews in Fish Biology and Fisheries >Exploration of spatial and temporal patterns of fish diversity and composition in a tropical estuarine system of Mexico
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Exploration of spatial and temporal patterns of fish diversity and composition in a tropical estuarine system of Mexico

机译：探索墨西哥热带河口系统鱼类多样性和组成的时空格局

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There are many studies of fish assemblages in temperate systems, but little information exists about tropical estuarine systems, particularly in the Western Atlantic Region including Mexico. We investigated the fish community structure in the Pueblo Viejo lagoon, Veracruz. Biological samples were collected monthly for one year at six sites: three with dense stands of Ruppia maritima and three sites without submerged vegetation. For each sample, temperature, salinity, dissolved oxygen, turbidity and depth were analyzed. The unbiased Simpson diversity index, Canonical Correspondence Analysis (CCA) and Discriminant Analysis (DA) were used to analyze the fish community. Environmental abiotic variables tended to show significant temporal, but not spatial differences. Fish diversity showed only a weak significant correlation with water temperature, and relatively strong diversity peaks, from June to August and April, were related to production peaks in the system. The two first axes of CCA accounted for 65% of the species-environment biplot variance, which suggested that monthly changes of salinity, turbidity and precipitation, and presence or absence of submerged vegetation, were the most important environmental variables in determining the observed variability in fish community composition. Further, fish diversity was significantly different between habitats with and those without the presence of submerged vegetation ( P < 0.02). A DA showed significant differences ( P < 0.03) in fish community composition between both kinds of habitats, with Lagodon rhomboides, Mugil curema and Menidia beryllina ( substantially more abundant in habitat with submerged vegetation) as the most important species in the discrimination of spatial fish composition. Considering both habitats combined, fewer differences were observed in fish diversity and community composition between rainy and dry seasons. Fish community composition showed greater similarity between seasons than between habitats, despite the fact that environmental abiotic variables showed an inverse pattern, suggesting that site factors, such as the presence of submerged vegetation, play a more important role in the maintenance of fish community patterns than those related to temporal influence.
机译：关于温带系统中鱼类组合的研究很多，但是关于热带河口系统的信息很少，特别是在包括墨西哥在内的西大西洋地区。我们调查了韦拉克鲁斯镇Pueblo Viejo泻湖的鱼类群落结构。为期一年，每月在六个地点采集生物样本：三个地点有密实的小榄仁，三个地点没有被淹没的植被。对于每个样品，分析温度，盐度，溶解氧，浊度和深度。使用无偏辛普森多样性指数，规范对应分析（CCA）和判别分析（DA）来分析鱼类群落。环境非生物变量往往显示出明显的时间差异，但没有空间差异。鱼类的多样性与水温之间的相关性很弱，从6月至8月和4月相对较高的多样性高峰与系统的生产高峰有关。 CCA的两个第一轴占物种-环境双图方差的65％，这表明盐度，浑浊度和降水量的月变化以及是否存在淹没植被，是决定观测到的物种多样性最重要的环境变量。鱼群落组成。此外，有和没有淹没植被的生境之间的鱼类多样性差异显着（P <0.02）。 DA显示两种生境之间鱼类群落组成存在显着差异（P <0.03），其中以泻湖菱形，Mugil curma和Menidia beryllina（淹没植被的栖息地中丰富得多）为区分空间鱼类的最重要物种组成。考虑到两个生境的结合，在雨季和旱季之间鱼类多样性和群落组成的差异较小。尽管环境非生物变量显示出相反的模式，但鱼类群落组成在季节之间的相似性比在栖息地之间更高，这表明，诸如淹没植被的存在等场所因素在维持鱼类群落模式方面起着更重要的作用。与时间影响有关的那些。

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