Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades.,Ecology Letters

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Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-05-11 , DOI: 10.1111/ele.13528
Arnaud Sentis _{1,

2} , Raphaël Bertram ₁ , Nathalie Dardenne ₁ , Jean-Christophe Simon ₃ , Alexandra Magro ₁ , Benoit Pujol ₄ , Etienne Danchin ₁ , Jean-Louis Hemptinne ₁

Affiliation

Trophic cascades – the indirect effect of predators on non‐adjacent lower trophic levels – are important drivers of the structure and dynamics of ecological communities. However, the influence of intraspecific trait variation on the strength of trophic cascade remains largely unexplored, which limits our understanding of the mechanisms underlying ecological networks. Here we experimentally investigated how intraspecific difference among herbivore lineages specialized on different host plants influences trophic cascade strength in a terrestrial tri‐trophic system. We found that the occurrence and strength of the trophic cascade are strongly influenced by herbivores’ lineage and host‐plant specialization but are not associated with density‐dependent effects mediated by the growth rate of herbivore populations. Our findings stress the importance of intraspecific heterogeneities and evolutionary specialization as drivers of trophic cascade strength and underline that intraspecific variation should not be overlooked to decipher the joint influence of evolutionary and ecological factors on the functioning of multi‐trophic interactions.

中文翻译：

草食动物谱系之间的种内差异及其寄主植物的专长驱动营养级联的强度。

营养级联（捕食者对不相邻的较低营养级的间接影响）是生态群落结构和动态的重要驱动力。然而，种内性状变异对营养级联强度的影响尚待探索，这限制了我们对生态网络潜在机制的理解。在这里，我们通过实验研究了专门针对不同寄主植物的草食动物谱系之间的种内差异如何影响陆地三营养系统的营养级联强度。我们发现，营养级联的发生和强度受草食动物的血统和寄主植物专化的强烈影响，但与草食动物种群的生长速率介导的密度依赖性效应无关。

更新日期：2020-07-06

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