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首页> 外文期刊>Aquatic Sciences >Temperature drives asymmetric competition between alien and indigenous freshwater snail species, Physa acuta and Physa fontinalis
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Temperature drives asymmetric competition between alien and indigenous freshwater snail species, Physa acuta and Physa fontinalis

机译：温度驱使外来和本地淡水蜗牛物种Physa acuta和Physa fontinalis之间的不对称竞争

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摘要

Biological invasion represents one of the major threats to global biodiversity as alien species often displace indigenous species. Knowledge of the mechanisms behind such displacements and the driving factors of the competitive superiority of the alien species remain limited. We combined analysis of field data and laboratory experiments examining species interactions to investigate the impact of temperature in the case of the alien freshwater snail Physa acuta and the indigenous snail Physa fontinalis. From field data, we identified higher temperature as the most important difference between sites populated by P. acuta and P. fontinalis. Results of the species interaction experiment conducted at 15, 20, and 25 A degrees C revealed that the competitive superiority of P. acuta over P. fontinalis increases at warmer temperatures. In single species treatments, increasing temperature stimulated growth rates in both species. Coexistence treatments revealed an asymmetric competitive interaction between the two snail species. In both species, the density of conspecifics did not affect growth rates; however, density of heterospecifics did. This effect of heterospecifics varied with temperature. At 15 A degrees C, the presence of heterospecifics stimulated the growth rates of both species, while at higher temperatures the presence of heterospecifics stimulated the growth rate in P. acuta only, but inhibited the growth rate in P. fontinalis. Our study shows that temperature can be a powerful driver of competitive outcomes between alien and indigenous species and highlight that the environmental context influences species interactions and impacts of alien species.
机译：生物入侵是全球生物多样性的主要威胁之一，因为外来物种经常取代土著物种。关于这种位移背后的机制以及外来物种竞争优势的驱动因素的知识仍然有限。我们结合了现场数据分析和检查物种相互作用的实验室实验，以研究温度对外来淡水蜗牛Physa acuta和本土蜗牛Physa fontinalis的影响。从现场数据中，我们确定较高的温度是由P. acuta和P. fontinalis组成的站点之间最重要的差异。在15 A，20 A和25 A的温度下进行的物种相互作用实验的结果表明，在较温暖的温度下，金黄色假单胞菌对角实假单胞菌的竞争优势增加。在单物种处理中，温度升高刺激了两个物种的生长速率。共存处理揭示了两种蜗牛之间的不对称竞争相互作用。在这两个物种中，同种异体的密度均不影响生长速度。然而，异质性的密度确实如此。异特异物的这种作用随温度而变化。在15°C时，异种特异性的存在刺激了两个物种的生长速度，而在更高的温度下，异种特异性的存在仅刺激了金黄色葡萄球菌的生长速度，但抑制了P. fontinalis的生长速度。我们的研究表明，温度可能是外来物种与本土物种之间竞争结果的强大驱动力，并强调环境环境会影响物种之间的相互作用和外来物种的影响。

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  • 来源
    《Aquatic Sciences》 |2017年第1期|187-195|共9页
  • 作者

    Frueh Denise; Haase Peter; Stoll Stefan;

  • 作者单位

    Senckenberg Res Inst, Dept River Ecol & Conservat, Clamecystr 12, D-63571 Gelnhausen, Germany|Nat Hist Museum Frankfurt, Clamecystr 12, D-63571 Gelnhausen, Germany;

    Senckenberg Res Inst, Dept River Ecol & Conservat, Clamecystr 12, D-63571 Gelnhausen, Germany|Nat Hist Museum Frankfurt, Clamecystr 12, D-63571 Gelnhausen, Germany|Univ Duisburg Essen, Fac Biol, Dept River & Floodplain Ecol, Essen, Germany;

    Senckenberg Res Inst, Dept River Ecol & Conservat, Clamecystr 12, D-63571 Gelnhausen, Germany|Nat Hist Museum Frankfurt, Clamecystr 12, D-63571 Gelnhausen, Germany|Univ Koblenz Landau, Dept Ecotoxicol & Environm, D-76829 Landau, Germany;

  • 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

    Alien species; Benthic invertebrates; Species interaction; Multiple stressors; Climate change;

    机译：外来物种底栖无脊椎动物物种相互作用多种应激源气候变化;

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