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Differences in refuge function for prey and tolerance to crayfish among macrophyte species

机译：大型植物物种对小龙虾的捕食和耐受能力的差异

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The invasive crayfish Procambarus clarkii is an omnivore and an ecosystem engineer whose feeding mechanism has reduced the abundance of many native invertebrates and macrophytes. Since macrophytes provide refuges for aquatic insects, macrophyte depletion by crayfish might have indirect negative effects on animal prey in aquatic habitats. We postulated that the prey refuges provided by macrophytes and macrophyte tolerance to crayfish cutting and feeding vary among macrophyte species. We conducted two experiments to (1) investigate differences in macrophyte refuge function for dragonfly larvae against crayfish, and (2) test the tolerance to crayfish cutting and feeding among macrophyte species. Elodea nuttallii (submerged plant), Potamogeton crispus (submerged plant), and Carex idzuroei (emergent plant) had greater refuge effects than Trapa japonica (floating-leaved plant), an effect that might result from the larger total cover of E. nuttallii, P. crispus, and C. idzuroei, and the hardness of C. idzuroei leaves. Tolerance to crayfish cutting and feeding was greater in C. idzuroei than in the other species. As the macro-invertebrate assemblages in submerged vegetation are more abundant and species-rich than those in emergent and floating-leaf vegetation, conservation of E. nuttallii and P. crispus should be prioritized for restoring native aquatic animals in ecosystems invaded by the introduced crayfish.
机译：侵入性小龙虾克氏原螯虾是杂食性动物和生态系统工程师，其摄食机制减少了许多原生无脊椎动物和大型植物的丰度。由于大型植物为水生昆虫提供了庇护所，因此小龙虾对大型植物的消耗可能会对水生生境中的动物猎物产生间接的负面影响。我们推测，大型植物种类中，大型植物提供的猎物避难所和大型植物对小龙虾的切割和觅食的耐受性不同。我们进行了两个实验，以（1）研究蜻蜓幼虫针对小龙虾的大型植物保护区功能的差异，以及（2）测试大型植物物种对小龙虾切割和取食的耐受性。 Elodea nuttallii（淹没植物），Potamogeton crispus（淹没植物）和Carex idzuroei（萌发植物）的保护作用要比Trapa japonica（浮叶植物）更大，这可能是由于E.nuttallii的总覆盖量较大， P. crispus和C. idzuroei，以及C. idzuroei叶片的硬度。 C. idzuroei对小龙虾切割和摄食的耐受性高于其他物种。由于淹没型植被中的大型无脊椎动物组合比新兴和浮叶型植被中的大型无脊椎动物种类和物种丰富，因此应优先保护nuttallii和P. crispus，以在引入的小龙虾入侵的生态系统中恢复原生水生动物。 。

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