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首页> 外文期刊>Journal of Fish Biology >Trophic interference by Salmo trutta on Aplochiton zebra and Aplochiton taeniatus in southern Patagonian lakes
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Trophic interference by Salmo trutta on Aplochiton zebra and Aplochiton taeniatus in southern Patagonian lakes

机译：Salmo trutta对南部巴塔哥尼亚湖中的Aplochiton斑马和Aplochiton taeniatus的营养干扰

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摘要

The length and mass ratio, diet and isotopic composition of Aplochiton zebra and Aplochiton taeniatus inhabiting a Salmo trutta-invaded and a S. trutta-free lake in southern Patagonia were compared. Results indicate that S. trutta exercises important trophic interference over A. zebra and A. taeniatus, causing changes in their dietary composition by reducing the consumption of winged Diptera through changes in feeding behaviours that involve jumping out of the water. This effect is significantly higher in A. zebra than in A. taeniatus a species that has a highly specialized diet. The dietary changes of A. zebra and A. taeniatus in sympatry with S. trutta lead to an impoverishment of their isotopic nitrogen signals (15N), suggesting a reduction of their trophic position. In the case of A. zebra, this translates into a significant decrease in its body condition factor. Such interference could lead to a population decline of this species and would explain the current distribution range decline and allopatry with S. trutta in fluvial systems.
机译：比较了居住在巴塔哥尼亚南部萨尔摩·特鲁塔入侵和无沙门氏菌湖中的Aplochiton斑马和Aplochiton taeniatus的长度和质量比，日粮和同位素组成。结果表明，trutta trutta对斑马线虫和ta.ia taeniatus进行了重要的营养干扰，通过改变涉及跳水的进食行为来减少翅翅双翅目的消费，从而导致其饮食组成发生变化。在斑马线虫中，这种效果明显高于在饮食上高度专业化的ta.iaenustus。斑马线虫和and蛇A. trutta的饮食结构发生变化，导致其同位素氮信号（15N）下降，表明其营养位置降低。对于斑马线虫，这转化为其身体状况因子的显着降低。这种干扰可能导致该物种的种群数量下降，并可以解释当前分布范围的下降以及河流系统中特鲁特链霉菌的变色作用。

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