Stronger inducible defences enhance persistence of intraguild prey.
Stronger inducible defences enhance persistence of intraguild prey.
复制标题
更强的诱导防御可以增强公会内猎物的持久性。
DOI：
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发表时间：
2010
影响因子：
4.8
通讯作者：
B. Anholt
中科院分区：
文献类型：
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作者：
P. Kratina;E. Hammill;B. Anholt
1. 群体内捕食在自然界中广泛存在，尽管它可能对食物网动态产生不稳定影响。 2. 反捕食者诱导防御会影响种群的出生率和死亡率，并有可能大幅改变食物网动态，并可能增加群体内猎物的持久性。 3. 在恒化器实验中，我们研究了诱导防御对由群内捕食者、群内猎物和基础资源组成的水生微生物食物网动态的长期影响。我们控制了环境条件并选择了公会内猎物的品系，这些猎物的表达诱导防御的强度各不相同。 4.我们发现，公会内的猎物具有更强的诱发反捕食者形态的倾向，其持续时间明显更长。此外，模型选择分析表明，防御表型的灵活性（诱导性本身）很可能是增强持久性的因素。 5. 由于群落层面的模式往往是个体生活史特征的结果，因此我们提出，诱导防御会增加种群的持久性，并可能导致自然界中理论上不稳定的群内捕食系统的广泛出现。
1. Intraguild predation is widespread in nature despite its potentially destabilizing effect on food web dynamics. 2. Anti-predator inducible defences affect both birth and death rates of populations and have the potential to substantially modify food web dynamics and possibly increase persistence of intraguild prey. 3. In a chemostat experiment, we investigated the long-term effects of inducible defences on the dynamics of aquatic microbial food webs consisting of an intraguild predator, intraguild prey, and a basal resource. We controlled environmental conditions and selected strains of intraguild prey that varied in the strength of expressed inducible defences. 4. We found that intraguild prey with a stronger tendency to induce an anti-predator morphology persist for significantly longer periods of time. In addition, model selection analysis implied that flexibility in defensive phenotype (inducibility itself) is most likely the factor responsible for the enhanced persistence. 5. As patterns at the community level often emerge as a result of the life-history traits of individuals, we propose that inducible defences increase the persistence of populations and may contribute to the widespread occurrence of theoretically unstable intraguild predation systems in nature.