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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effects of salinity on fish assemblage structure: An evaluation based on taxonomic and functional approaches in the Casamance estuary (Senegal, West Africa)
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Effects of salinity on fish assemblage structure: An evaluation based on taxonomic and functional approaches in the Casamance estuary (Senegal, West Africa)

机译：盐度对鱼群结构的影响：基于生物分类和功能方法的卡萨芒斯河口（塞内加尔，西非）评估

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摘要

The utility of taxonomic and functional approaches in assessing the structure of fish communities is tested in the hypersaline estuary of the Casamance river using data from surveys of commercial fisheries conducted between April and July of 2005. Both taxonomic and functional diversity decrease from downstream to upstream regions of the estuary. In terms of species composition, marine-estuarine species (33.3-46.3%, depending on the site) and estuarine species of marine origin (29.3-41.7%) dominate the exploited population in the Casamance estuary. In contrast, the proportion of strictly estuarine species observed upstream is twice that observed downstream. Quantitative analysis based on biomass landed distinguishes two groups in the population: (1) a group of species that is dominant downstream, containing primarily terminal predators and secondary consumers categorised as marine species that are occasional or accessory in estuaries, estuarine marine species, and estuarine species of marine origin; and (2) a group of species characteristic of the upstream region, dominated by a few species (Sarotherodon melanotheron, Tilapia guineensis, and Mugil cephalus) mainly of strictly estuarine and/or herbivorous categories and Elops lacerta, a carnivore fish. The outcomes of the two approaches are similar, and both indicate that the fish community in this estuary is under the influence of strong environmental disturbance. However, the scales at which the specific and functional approaches most reliably reflect environmental conditions are different. The taxonomic approach, i.e., the use of specific biomass is more appropriate at the ecosystem scale and therefore more accessible to local human communities, whereas the functional approach is better suited to regional and sub-regional studies because of the change in species composition from one environment to another.
机译：使用2005年4月至7月进行的商业性渔业调查数据，在卡萨芒斯河的高盐河口中测试了分类学和功能方法在评估鱼类群落结构中的效用。分类学和功能多样性均从下游到上游地区减少的河口。就物种组成而言，海洋河口物种（占站点的33.3-46.3％）和海洋起源的河口物种（占29.3-41.7％）在卡萨芒斯河口的被开发种群中占主导地位。相反，在上游观察到的严格河口物种的比例是下游观察到的两倍。基于登陆的生物量进行的定量分析将种群中的两类物种进行了区分：（1）下游占优势的一组物种，主要包含归类于河口，河口海洋物种和河口的海洋物种的终端掠食者和次要消费者。海洋起源的物种； （2）上游地区的一组特征物种，主要为严格河口和/或草食类的少数物种（Sarotherodon melanotheron，罗非鱼和Mugil cephalus）以及食肉动物Elops lacerta。两种方法的结果相似，均表明该河口的鱼类群落受到强烈环境干扰的影响。但是，特定方法和功能方法最可靠地反映环境条件的尺度不同。分类方法，即在生态系统范围内使用特定生物量更合适，因此更易于当地人类社区使用，而功能方法则更适合于区域和次区域研究，因为物种组成从一种改变。环境到另一个。

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