Towards a mechanistic understanding of individual‐level functional responses: Invasive crayfish as model organisms
Towards a mechanistic understanding of individual‐level functional responses: Invasive crayfish as model organisms
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DOI：
10.1111/fwb.13456
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发表时间：
2019-12
影响因子：
2.7
通讯作者：
Stefan M. Linzmaier;J. Jeschke
中科院分区：
文献类型：
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作者：
Stefan M. Linzmaier;J. Jeschke
1.在新的社区中，越来越多的新的和新兴的入侵物种与居民物种相互作用，其中一些本身就是非本地的。我们实施了一个创新的营养相互作用框架，为新的社区和量化的互动强度和影响潜力的一个真正的新物种（大理石纹小龙虾原螯虾virginalis）与居民非本地对应（刺颊小龙虾Faxonius limosus）。作为猎物，我们使用了Dreissena贻贝，它们也是非本地的，现在在许多欧洲和北美的水生生态系统中占有重要地位。2.对于这两种小龙虾物种，我们预测功能反应的基础上，我们参数化的一组实验观察到的觅食行为分为两组，每个组的平均活动（低和高活动），侵略得分（低和高侵略），和侵略性（积极得分）或可怕的威胁反应（负分）的机械模型。由于亚组的样本量较低，我们将雄性和雌性刺颊小龙虾合并在一起。我们计算了该组所有个体的每个猎物密度的平均值。然后，我们评估了这些组之间的功能反应是否不同。
1. In novel communities, a rising number of new and emerging invasive species interact with resident species, some of which are non-native themselves. We implemented an innovative trophic interaction framework for novel communities and quantified the interaction strength and impact potential of a truly novel species (marbled crayfish Procambarus virginalis ) with a resident non-native counterpart (spiny-cheek crayfish Faxonius limosus ). As prey, we used Dreissena mussels, which are non-native as well and now hold a key position in many European and North American aquatic ecosystems. 2. For both crayfish species, we predicted functional responses based on a mechanistic model that we parameterised with a set of experimental observations of foraging behaviour into two groups each by their mean activity (low and high activity), aggression score (low and high aggression), and aggressive (positive score) or fearful threat response (negative score). We pooled male and female spiny-cheek crayfish here due to low sample size of the subgroups. We calculated means for each prey density from all individuals of the group. We then assessed if functional responses differed between these groups.