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首页> 外文期刊>Estuarine Coastal and Shelf Science >Does the invasive plant Elymus athericus modify fish diet in tidal salt marshes?
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Does the invasive plant Elymus athericus modify fish diet in tidal salt marshes?

机译：外来入侵植物Elymus athericus会改变潮汐盐沼中的鱼类饮食吗？

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The invasion of Mont-Saint-Michel Bay salt marshes (France) by a grass species (Elymus athericus) has led to important changes in vegetation cover, which is likely to modify the habitat for many invertebrates. Some of them constitute the main food items for several fish species, such as young sea bass (Dicentrarchus labrax) and sand goby (Pomatoschistus minutus), that feed in salt marsh creeks during high tides. As a result, fish nursery functions of salt marshes could be modified by the E. athericus invasion. In order to test this hypothesis, gut contents of the two most abundant fish species (sea bass and sand goby) were compared before and after E. athericus invasion in the same salt marsh creek and using the same methodology. The accessibility and availability of the main food item, the semi-terrestrial amphipod Orchestia gam-marella, were estimated and compared between invaded (dominated by E. athericus) and original areas (dominated by Atriplex portulacoides). Gut content analysis showed a significantly greater percentage of fish leaving with empty guts from E. athericus areas than from A. portulacoides areas. The sea bass diet composition study showed a major shift in the relative importance of the main food items: before E. athericus invasion, diets were dominated by the semi-terrestrial species O. gammarella, whereas after the E. athericus invasion they were dominated by a marine mysid Neomysis integer. The same trend was found for sand gobies, with a shift of the main food item from O. gammarella before invasion to the polychaete Hediste diversicolor after invasion. These trophic changes may be explained by the lower accessibility and availability of O. gammarella in invaded communities than in natural ones. The E. athericus invasion, observed throughout northern Europe, is thus likely to disturb trophic function of natural salt marshes for fish. This preliminary study of the E. athericus invasion is also an illustration that invasive species are an urgent problem in conservation biology.
机译：草物种（Elymus athericus）对圣米歇尔湾盐沼（法国）的入侵已导致植被覆盖率发生重大变化，这很可能会改变许多无脊椎动物的栖息地。其中一些是几种鱼类的主要食物，例如幼鲈鱼（Dicentrarchus labrax）和sand鱼（Pomatoschistus minutus），它们在涨潮时会喂食盐沼小河。结果，盐沼的鱼类育苗功能可以通过斑头大肠杆菌的入侵而改变。为了检验该假设，在相同的盐沼小河中，使用相同的方法比较了斑节肠杆菌入侵之前和之后两种最丰富的鱼类（鲈鱼和虾虎鱼）的肠道含量。估计并比较了主要食品（半陆栖两栖类Orchestia gam-marella）的可及性和可利用性，并比较了入侵地区（以斑节肠杆菌为主）和原始地区（以滨藜属为主）。肠道含量分析显示，空斑肠鱼离开斑节肠杆菌区的比例明显高于马齿。科鱼类。鲈鱼饮食组成研究表明，主要食物的相对重要性发生了重大变化：在斑节对虾侵袭之前，饮食以半陆栖物种O. gammarella为主，而斑节对虾侵袭后，饮食主要由半陆栖物种O. gammarella主导。海洋mysid Neomysis整数。对于沙go，也发现了相同的趋势，主要食物从入侵前的O. gammarella转移到入侵后的多毛HeHediste diversicolor。这些营养变化的原因可能是，与自然界相比，被入侵O. gammarella的可及性和可用性较低。因此，在整个北欧观察到的斑纹大肠杆菌的入侵很可能会扰乱天然盐沼对鱼类的营养功能。对斑驳大肠杆菌的入侵的初步研究也说明了入侵物种是保护生物学中的紧迫问题。

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