ABSTRACT: The food web structure of a coastal fish community (western Dutch Wadden Sea) was studied based on stomach content data from samples collected between 2010 and 2018. In total, 54 fish species were caught and 72 different prey items were identified. Fish species consumed from only a few up to >30 different prey species, suggesting the presence of both opportunistic and more specialized feeders. We found no significant differences between years or switches in food source with fish size. The trophic positions of the Wadden Sea fish community ranged from 2.0 to 4.7, with most trophic positions above 3.0. In the past, (near)-resident species were the most abundant guild in spring, and juvenile marine migrants in autumn. At present, all guilds are present in similar but low abundances. The (near)-resident community consisted of about 20 species that fed primarily on amphipod crustaceans, brown shrimps and juvenile herring. There was only a slight overlap in diet with the group of juvenile marine migrants (5 species of juvenile flatfishes and clupeids), whose preferred prey were copepods, polychaetes and brown shrimps. About 15 species of marine seasonal visitors showed an overlap in diet with both the (near)-resident and the juvenile marine migrants, especially for brown shrimps and to a lesser extent herring and gobies. Our results illustrate (1) the pivotal position of a few key prey species (amphipod crustaceans, brown shrimps, juvenile herring and gobies) for the coastal Wadden Sea fishes and (2) that the substantial prey overlap in the diet of some predators cannot exclude intra- and inter-specific competition among these predators.

中文翻译：

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只有少数主要猎物为温带沿海鱼类食物网提供燃料

摘要：根据2010年至2018年收集的样本中的胃含量数据，对沿海鱼类群落（荷兰西部瓦登海）的食物网结构进行了研究。总共捕获了54种鱼类，并鉴定了72种不同的猎物。鱼只消耗了多达30种以上的猎物，这表明既存在机会性饲养者，也存在更加专业化的饲养者。我们发现不同年份或不同鱼类来源的食物来源之间没有显着差异。瓦登海鱼类群落的营养位置范围从2.0到4.7，大多数营养位置高于3.0。过去，（近）常住物种是春季最丰富的行会，而秋季则是少年海洋移民。目前，所有行会都以相似但数量很少的形式存在。这个（近）居民社区包括大约20种，主要以两栖类甲壳类动物，棕色虾和少年鲱鱼为食。在饮食上，与少年海洋移民（5种少年比目鱼和clupeids）组的饮食中仅有一点重叠，它们的首选猎物是co足类，多毛类和棕虾。大约有15种海洋季节性游客与（近）居民和少年海洋移民的饮食有重叠，特别是对棕色虾，在较小程度上是鲱鱼和虾虎鱼。我们的结果说明（1）一些主要猎物（两栖类甲壳类动物，棕色虾，