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首页> 外文期刊>Aquatic Sciences >Invasive crayfish impacts on native fish diet and growth vary with fish life stage
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Invasive crayfish impacts on native fish diet and growth vary with fish life stage

机译：入侵小龙虾对本地鱼类饮食和生长的影响随鱼类生命阶段的不同而不同

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摘要

Assessing the impacts of invasive organisms is a major challenge in ecology. Some widespread invasive species such as crayfish are potential competitors and reciprocal predators of ecologically and recreationally important native fish species. Here, we examine the effects of signal crayfish (Pacifastacus leniusculus) on the growth, diet, and trophic position of the chub (Squalius cephalus) in four rivers in Britain. Growth rates of 0+ chub were typically lower in sympatric populations with signal crayfish compared with allopatric populations, and this effect could be traced through to 2+ chub in one river. However, growth rates of older chub (5+ to 6+) were typically higher in the presence of crayfish. Sympatry with crayfish resulted in lower chub length-at-age and mass-at-age in half of the rivers sampled, with no change detected in the other rivers. Stable isotope analyses (delta C-13 and delta N-15) revealed that both chub and crayfish were omnivorous, feeding at multiple trophic levels and occupying similar trophic positions. We found some evidence that chub trophic position was greater at invaded sites on one river, with no difference detected on a second river. Mixing models suggested crayfish were important food items for both small and large chub at invaded sites. This study provides evidence that invasive species can have both positive and negative effects on different life stages of a native species, with the net impact likely to depend on responses at the population level.
机译：评估侵入性生物的影响是生态学的一项重大挑战。一些广泛入侵的物种，例如小龙虾，是具有重要生态和休闲意义的本地鱼类的潜在竞争者和相互掠食者。在这里，我们研究了英国四条河中信号小龙虾（Pacifastacus leniusculus）对（Squalius cephalus）的生长，饮食和营养位置的影响。与同种异体种群相比，带信号小龙虾的同伴种群中0+丘的生长率通常较低，这一效应可以追溯到一条河流中的2+丘。但是，在有小龙虾的情况下，较老的鲑鱼的生长速率（5+至6+）通常更高。与小龙虾的共生导致在一半的采样河流中成年时的长和成年时质量降低，其他河流中未发现变化。稳定的同位素分析（δC-13和δN-15）表明，和小龙虾都是杂食性的，以多个营养级进食并且占据相似的营养位。我们发现一些证据表明，一条河流的入侵地点的营养位置更大，而另一条河流没有发现差异。混合模型表明，小龙虾是入侵地点小型和大型large鱼的重要食物。这项研究提供的证据表明，入侵物种可能对本地物种的不同生命阶段产生积极和消极的影响，其净影响可能取决于种群水平的反应。

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  • 来源
    《Aquatic Sciences》 |2017年第1期|113-125|共13页
  • 作者

    Wood Kevin A.; Hayes Richard B.; England Judy; Grey Jonathan;

  • 作者单位

    Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England|Wildfowl & Wetlands Trust, Slimbridge GL2 7BT, Glos, England;

    Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England|Environm Agcy, 2 Bishops Sq,St Albans Rd West, Hatfield AL10 9EX, Herts, England;

    Environm Agcy, 2 Bishops Sq,St Albans Rd West, Hatfield AL10 9EX, Herts, England;

    Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England|Wild Trout Trust, POB 120, Waterlooville PO8 0WZ, England|Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Chub Squalius cephalus; Competition; Diet shift; Invasive species; Scalimetry; Signal crayfish Pacifastacus leniusculus; Stable isotopes;

    机译：鱼;竞争;饮食转移;入侵物种;Scalimetry;小龙虾信号细圆线虫;稳定的同位素;

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