Nutritional effects on chemical defense alter predator–prey dynamics

Nutritional effects on chemical defense alter predator–prey dynamics
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营养对化学防御的影响改变了捕食者的猎物动态

DOI:
10.1007/s00049-018-0253-9
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发表时间:
2018
期刊:
影响因子:
1.8
通讯作者:
Heethoff
Heethoff
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Brückner;Heethoff

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水库为基础的化学防御(=可还原防御)是一种普遍的机制,以击退捕食者在许多无脊椎动物。我们研究了大量营养素对防御分泌物的可用性和再生的影响,并将可还原防御的理论功能反应模型参数化,以预测营养对捕食者-猎物动态的影响。我们的建模方法表明,最初大量的防御分泌物提供了一个有效的短期防御,而较高的再生率是有利的永久捕食压力下。再生率与膳食脂肪和碳水化合物的量相关,表明大量营养素对化学防御和捕食成功的适应性连接,覆盖两个营养水平的影响。我们的研究结果表明,迫切需要将化学防御的动力学方面纳入食物网中捕食者-猎物相互作用的建模。
Reservoir-based chemical defense (= reducible defense) is a widespread mechanism to repel predators in many invertebrates. We investigated the influence of macronutrients on the availability and regeneration of defensive secretions and parametrize a theoretical functional response model for reducible defense to predict nutritional effects on predator–prey dynamics. Our modeling approach showed that initially high amounts of defensive secretions provided an effective short-time defense, while higher regeneration rates were favorable under permanent predation pressure. Regeneration rates were correlated to the amount of dietary fat and carbohydrates, indicating an adaptive connection of macronutrients on chemical defense and predatory success—an effect covering two trophic levels. Our results underpin the urgent need to integrate dynamical aspects of chemical defense into the modeling of predator–prey interactions in food webs.
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