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<p>We investigated ecological interactions between introduced fish species (native and alien) and native amphibians in mountain lakes worldwide. Most studies were concentrated in Europe and North America. Collectively, the literature documented 765 interactions involving 27 fish species and hybrids from seven families, and 35 amphibian species from 10 families. Salmonids dominated the interaction network, particularly <i>Salmo trutta</i> (Linnaeus, 1758), <i>Oncorhynchus mykiss</i> (Walbaum, 1792), and <i>Salvelinus fontinalis</i> (Mitchill, 1814). The amphibians most affected were <i>Rana muscosa</i> (Camp, 1917), <i>Ambystoma macrodactylum</i> (Baird, 1850), and <i>Rana temporaria</i> (Linnaeus, 1758). Larval stages were the most impacted (37.8% of cases), followed by adults (32.2%), while eggs, paedomorphs, and juveniles were less often affected. More than half of all interactions (54.9%) indicated negative outcomes, with predation accounting for 20% of cases, primarily targeting larvae. The network analysis revealed the structural dominance of salmonids in both Europe and North America. In Europe, <i>S. trutta</i> exhibited the highest connectivity, while amphibians such as <i>Mesotriton alpestris</i> (Laurenti, 1768) and <i>R. temporaria</i> were most affected. In North America, <i>O. mykiss</i> and <i>S. fontinalis</i> exert strong pressure on amphibians. Overall, fish introductions have widespread negative effects on amphibians in mountain ecosystems, with impacts varying by species and life stage.</p>

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Ecological consequences of fish stocking on amphibian communities in mountain lakes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月14日

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  • Sabina E. Vlad,
  • Teodora L. Tănase,
  • Miruna Vizireanu,
  • Geanina Fănaru,
  • Ovidiu Drăgan,
  • Florina Stănescu,
  • Dan Cogălniceanu

摘要

We investigated ecological interactions between introduced fish species (native and alien) and native amphibians in mountain lakes worldwide. Most studies were concentrated in Europe and North America. Collectively, the literature documented 765 interactions involving 27 fish species and hybrids from seven families, and 35 amphibian species from 10 families. Salmonids dominated the interaction network, particularly Salmo trutta (Linnaeus, 1758), Oncorhynchus mykiss (Walbaum, 1792), and Salvelinus fontinalis (Mitchill, 1814). The amphibians most affected were Rana muscosa (Camp, 1917), Ambystoma macrodactylum (Baird, 1850), and Rana temporaria (Linnaeus, 1758). Larval stages were the most impacted (37.8% of cases), followed by adults (32.2%), while eggs, paedomorphs, and juveniles were less often affected. More than half of all interactions (54.9%) indicated negative outcomes, with predation accounting for 20% of cases, primarily targeting larvae. The network analysis revealed the structural dominance of salmonids in both Europe and North America. In Europe, S. trutta exhibited the highest connectivity, while amphibians such as Mesotriton alpestris (Laurenti, 1768) and R. temporaria were most affected. In North America, O. mykiss and S. fontinalis exert strong pressure on amphibians. Overall, fish introductions have widespread negative effects on amphibians in mountain ecosystems, with impacts varying by species and life stage.