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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variation of assemblage and feeding guild structure of fish species in a boreal tidal basin
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Seasonal variation of assemblage and feeding guild structure of fish species in a boreal tidal basin

机译：北部潮汐盆地鱼类物种组成和摄食行会结构的季节性变化

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摘要

Species composition, abundance, feeding relationships and guild structure of the fish assemblage in the Sylt-Romo bight, a tidal basin in the northern Wadden Sea, were investigated to show seasonal differences and the importance of functional groups in this area. The tidal flats and in shallow subtidal areas were sampled using a beach seine and a bottom trawl net was used for deeper subtidal areas and tidal gullies. Species richness of fish was highest in summer where 26 species were caught, while the lowest richness was recorded in winter (17 species). Clear differences in species richness and abundance were found between shallow areas and deeper parts of the bight. Clupea harengus and Ammodytes tobianus were the most abundant species in deeper areas, while Pomatoschistus microps and Pomatoschistus minutus dominated shallower waters. Gut contents of 27 fish species were identified and the guild structure analyzed by UPGMA clustering of niche overlaps. Calanoid copepods (19.9%), Crangon crangon (18.2%) and mysid shrimps (8.4%) were the most abundant prey items of all fish species combined. Seven feeding guilds were present in the fall and winter, and eight and six in spring and summer, respectively. Fish feeding on calanoid copepods and C. crangon were present year round, whereas the occurrence of other guilds varied between seasons. Species composition of prey changed through seasons and, for some fish species, even the feeding mode itself varied with season. Most noticeable, 11 fish species changed guilds between seasons. We found a convergence in summer towards abundant prey items, whereas in winter diet overlap was lower. This is the first investigation of guild structure of almost all fish species present in a Wadden Sea area, and shows that consideration of seasonal differences is essential when determining feeding relationships of fish in temperate areas.
机译：对瓦登海北部潮汐盆地Sylt-Romo湾的鱼群的种类组成，丰度，摄食关系和行会结构进行了调查，以显示该季节的季节性差异和功能群的重要性。使用海滩围网对潮滩和浅潮下区域进行了采样，而底部拖网则用于较深的潮下区域和潮沟。鱼类的物种丰富度在夏季最高，捕获到26种，而在冬天则最低（17种）。在浅海区和深海区之间发现物种丰富度和丰度的明显差异。在较深的地区，海豌豆（Clupea harengus）和豆蔻（Ammodytes tobianus）是最丰富的物种，而浅色水域则以Pomatoschistus microps和Pomatoschistus minutus为主。鉴定了27种鱼类的肠道内含物，并通过UPGMA生态位重叠的聚类分析了行会结构。 Calanoid pe足类（19.9％），Crangon克兰贡（18.2％）和mysid虾（8.4％）是所有鱼类中最丰富的猎物。秋季和冬季有七个喂食行会，春季和夏季分别有八个和六个。全年都以cal足类pe足类和C. crangon为食，而其他行会的发生在不同季节之间也有所不同。猎物的种类组成随季节而变化，对于某些鱼类，甚至捕食方式本身也随季节而变化。最引人注目的是，11种鱼类在季节之间改变了行会。我们发现夏季趋向于捕食大量猎物，而冬季饮食重叠率较低。这是对瓦登海地区几乎所有鱼类的行会结构的首次调查，表明在确定温带地区鱼的摄食关系时，必须考虑季节差异。

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