Intraspecific maternal competition induces summer diapause in insect parasitoids

Kévin Tougeron; George Hraoui; Cécile Le Lann; Joan van Baaren; Jacques Brodeur

首页> 中文期刊> 《中国昆虫科学：英文版》 >Intraspecific maternal competition induces summer diapause in insect parasitoids

Intraspecific maternal competition induces summer diapause in insect parasitoids

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

Organisms often live in unpredictable environments and have to adopt life history strategies that optimize their fitness under these conditions.According to bet-hedging theory,individuals can reduce variation in fitness outcomes by investing in different strategies at the same time.For arthropods,facultative summer diapause enables survival during dry and hot periods of the year,and can be triggered by a decrease in resource abundance.However,the effect of resource depletion on diapause induction has never been disentangled from the effect of the perception of the presence of competitors.Using two solitary parasitoid species of cereal aphids as a model system,Aphidius avenae (Haliday) and Aphidius rhopalosiphi (De Stefani-Perez) (Hymenoptera:Braconidae),we tested whether (i) low absolute host density and/or (ii) high levels of parasitoid females' competition lead to maternal-induced summer diapause in parasitoid offspring.Under summer-like climatic conditions,emerging parasitoid females were (i) reared alone and exposed to different host densities (from 5 to 130 aphids),or (ii) reared together with competing females (from 2 to 20 females) and then exposed individually to 50 aphids.For both parasitoid species,low aphid densities did not induce summer diapause.However,the incidence of summer diapause increased up to a maximum of 11％ with increasing levels of competition experienced by female parasitoids.More than 60％ of the females produced both diapausing and nondiapausing offspring after being kept at the two highest competition densities.Such a "spreading-the-risk" strategy has likely evolved to optimize parasitoid fitness by preventing the following generation from exposure to low populations of suitable hosts and high mortality from superparasitism.These results provide the first experimental evidence of direct maternal competition-induced diapause in insects,and may change the way we apprehend the evolution of arthropod seasonal ecology,by considering intraspecific competition.

著录项

来源
《中国昆虫科学：英文版》 |2018年第6期|1080-1088|共9页
作者
Kévin Tougeron; George Hraoui; Cécile Le Lann; Joan van Baaren; Jacques Brodeur;
展开▼
作者单位

UMR-CNRS 6553 Ecobio, Université de Rennes 1, Rennes, France;

Université Bretagne Loire, Cité Internationale, Rennes, France;

Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale, Université de Montreal, Montréal, Canada;

Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale, Université de Montreal, Montréal, Canada;

UMR-CNRS 6553 Ecobio, Université de Rennes 1, Rennes, France;

Université Bretagne Loire, Cité Internationale, Rennes, France;

UMR-CNRS 6553 Ecobio, Université de Rennes 1, Rennes, France;

Université Bretagne Loire, Cité Internationale, Rennes, France;

Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale, Université de Montreal, Montréal, Canada;

展开▼
原文格式 PDF
正文语种 eng
中图分类
关键词

Intraspecific maternal competition induces summer diapause in insect parasitoids

摘要

著录项

相关主题

期刊订阅