四种入侵小龙虾和一种本地小龙虾的功能反应差异表明入侵者特定的生态影响,Freshwater Biology

当前位置： X-MOL 学术 › Freshwater Biol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

四种入侵小龙虾和一种本地小龙虾的功能反应差异表明入侵者特定的生态影响
Freshwater Biology ( IF 2.8 ) Pub Date : 2021-08-25 , DOI: 10.1111/fwb.13813
Franziska Chucholl ₁ , Christoph Chucholl ₂

Affiliation

入侵的非本地物种是对全球淡水生物多样性的主要威胁，非本地小龙虾物种经常造成广泛的生态破坏。然而，它们的影响程度：（1）取决于入侵者的身份和（2）与本地小龙虾的自然状态不同仍不清楚。在这方面，比较入侵物种和本地物种的功能反应是一种很有前途的方法。
在这里，我们探讨是否4只入侵螯虾（棉布小龙虾Faxonius免疫化，多刺的脸颊小龙虾Faxonius limosus，信号小龙虾螯leniusculus，和大理石的小龙虾螯virginalis）在欧洲的淡水和最普遍的乡土树种（高贵的小龙虾螯螯）重叠，对底栖食物网关键资源的潜在影响。首先，使用功能响应比作为影响度量，通过比较功能响应分析来评估对伽马科动物和斑马贻贝的影响；二、食用大型植物（Chara sp.) 和碎屑（落叶）被量化并使用喂养实验进行比较。
观察到入侵者和资源特定的影响。入侵的印花布小龙虾和信号小龙虾分别对伽马科动物和斑马贻贝表现出最强的人均效应，其功能反应比比本地贵族小龙虾高 2 倍。大理石纹小龙虾对这两种猎物都表现出中等影响，而刺颊小龙虾的影响低于贵族小龙虾。在饲养实验中，印花布小龙虾消耗的碎屑最多，而大型植物的消耗量在五种小龙虾之间没有差异。
我们的工作证明了四种北美小龙虾入侵者和欧洲高贵小龙虾在功能反应方面尚未发现的差异。所观察到的影响之间缺乏一致性表明主要是特定于物种的模式，并在考虑小龙虾的生态影响时强调了物种和资源特性的重要性。对入侵者特定潜在影响的初步评估将印花布小龙虾和信号小龙虾列为最具影响力的入侵者。

"点击查看英文标题和摘要"

Differences in the functional responses of four invasive and one native crayfish species suggest invader-specific ecological impacts

Invasive non-native species represent a leading threat to global freshwater biodiversity and non-native crayfish species frequently cause extensive ecological damage. However, the extent to which their impact: (1) depends on invader identity and (2) differs from the natural state with native crayfish remains unclear. Comparison of the functional responses of invasive and native species represents a promising approach in this regard.
Here, we explored whether four invasive crayfish species (calico crayfish Faxonius immunis, spiny-cheek crayfish Faxonius limosus, signal crayfish Pacifastacus leniusculus, and marbled crayfish Procambarus virginalis) in European freshwaters and the most widespread native species (noble crayfish Astacus astacus) overlap in function in their potential effects on key resources of benthic food webs. First, the impact on gammarids and zebra mussels was assessed by means of comparative functional response analysis using the functional response ratio as impact metric; second, the consumption of macrophytes (Chara sp.) and detritus (leaf litter) was quantified and compared using feeding experiments.
Both invader- and resource-specific effects were observed. Invasive calico crayfish and signal crayfish exhibited the strongest per capita effects on gammarids and zebra mussels, respectively, with functional response ratios being 2-fold higher than those of native noble crayfish. Marbled crayfish showed an intermediate effect on both prey species, whereas spiny-cheek crayfish had lower impacts than noble crayfish. In the feeding experiment, calico crayfish consumed the highest amount of detritus, while the consumption of macrophytes did not differ among the five crayfish species.
Our work demonstrates as-yet unrecognised differences in functional responses among the four North American crayfish invaders and the European noble crayfish. The lack of congruence across the observed impacts suggests a mostly species-specific pattern and stresses the importance of species and resource identity when considering the ecological impact of crayfish. An initial assessment of invader-specific potential impacts positions calico crayfish and signal crayfish among the most impactful invaders.

更新日期：2021-10-12

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南