Open AccessComplex trait differentiation between host‐populations of the pea aphid Acyrthosiphon pisum (Harris): implications for the evolution of ecological specialisation
Author(s) -
FRANTZ ADRIEN,
CALCAGNO VINCENT,
MIEUZET LUCIE,
PLANTEGENEST MANUEL,
SIMON JEANCHRISTOPHE
Publication year - 2009
Publication title -
biological journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.906
H-Index - 112
eISSN - 1095-8312
pISSN - 0024-4066
DOI - 10.1111/j.1095-8312.2009.01221.x
Subject(s) - biology , acyrthosiphon pisum , sympatric speciation , ecology , aphid , ecological speciation , host (biology) , biological dispersal , disruptive selection , sympatry , reproductive isolation , habitat , allopatric speciation , aphididae , evolutionary biology , natural selection , genetic variation , gene flow , selection (genetic algorithm) , pest analysis , population , genetics , botany , gene , homoptera , computer science , demography , artificial intelligence , sociology
Variation in traits affecting preference for, and performance on, new habitats is a key factor in the initiation of ecological specialisation and adaptive speciation. However, habitat and resource use also involves other traits whose influence on ecological and genetic divergence remains poorly understood. In the present study, we investigated the extent of variation of life‐history traits among sympatric populations of the pea aphid Acyrthosiphon pisum , which shows several host races that are specialised on various plants of the family Fabaceae plants and is an established model for ecological speciation. First, we assessed the community structure of microbial partners within host populations of the pea aphid. The effect of these microbes on host fitness is uncertain, although there is growing evidence that they may modulate various important adaptive traits of their host such as plant utilisation and resistance against natural enemies. Second, we performed a multivariate analysis on several ecologically relevant features of host populations recorded in the present and previous studies (including microbial composition, colour morph, reproductive mode, and male dispersal phenotype), enabling the identification of correlations between phenotypic traits. We discuss the ecological significance of these associations of traits in relation to the habitat characteristics of pea aphid populations, and their consequences for the evolution of ecological specialisation and sympatric speciation. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society , 2009, 97 , 718–727.