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首页> 外文期刊>Estuarine Coastal and Shelf Science >Composition, structural characteristics and temporal patterns of fish assemblages in non-tidal Mediterranean lagoons: A case study
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Composition, structural characteristics and temporal patterns of fish assemblages in non-tidal Mediterranean lagoons: A case study

机译：地中海非潮汐泻湖鱼群的组成，结构特征和时间格局：一个案例研究

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摘要

The importance of transitional water ecosystems as nursery habitats and feeding grounds for fish species is well-known. Detailed studies of colonization patterns of fish guilds in response to biotic and abiotic drivers are however unevenly distributed among ecosystem types. We address here the temporal variability of fish assemblages in small non-tidal lagoons in the Mediterranean basin. The study was carried out at the Acquatina lagoon (Lecce, Italy) where four stations, situated in two habitat types along a confinement gradient, were sampled twice per month for one year with fyke nets. Forty-five taxa ranging across 20 families were collected, with the most abundant species, Atherina boyeri, accounting for more than 95% of total abundance. Pooling all species together (excluding sand smelt), the structural features of the assemblage, relative abundance of families, and abundance of individual species all showed significant temporal patterns. Mean abundance peaked in Summer and Autumn and fell in Winter, whereas taxonomic richness and diversity were highest in Summer and lowest in Spring. Within the fish assemblage, multivariate ordination showed temporal segregation of species belonging to the same family or genus and expected to be functionally similar, suggesting that they avoid competition for space and resources by timing inward migration and peak occurrence differently. Of the environmental driving forces, which also showed temporal patterns of variation, salinity was the main factor affecting the distribution of individuals and species. The catch of young individuals of several marine species confirmed the role of this small lagoon as a nursery and feeding area, and emphasized the need for further studies.
机译：众所周知，过渡水生态系统作为鱼类栖息地和鱼类觅食场的重要性。但是，鱼类种群对生物和非生物驱动因素的定殖模式的详细研究在生态系统类型之间分布不均。我们在这里讨论地中海盆地小型非潮汐泻湖中鱼类种群的时间变化。这项研究是在Acquatina泻湖（意大利莱切）上进行的，其中四个站位于两个生境类型中，沿着一个限制梯度，每月用Fyke网采样两次，为期一年。收集了20个科的45个分类单元，其中最丰富的物种是Atherina boyeri，占总丰度的95％以上。将所有物种聚集在一起（不包括沙土融化），组合的结构特征，家族的相对丰富度以及单个物种的丰富度都显示出明显的时间格局。平均丰度在夏季和秋季达到峰值，在冬季下降，而分类学丰富度和多样性在夏季最高，而在春季最低。在鱼群中，多元排序显示出属于同一科或属的物种在时间上的分隔，并预期在功能上相似，这表明它们通过不同的时间向内迁移和高峰期避免了空间和资源的竞争。在还表现出时间变化的环境驱动力中，盐度是影响个体和物种分布的主要因素。捕获的几种海洋物种的年轻人证实了这个小泻湖作为育苗场和觅食区的作用，并强调需要进一步研究。

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