Hybrid vigor in the biological control agent, Longitarsus jacobaeae

Evolutionary Applications

Marianna Sz᜜s¹  Sanford D. Eigenbrode²  Mark Schwarzländer² 

[1]Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO, USA

[2]Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID, USA

关键词: classical biological control;    contemporary evolution;    establishment;    heterosis;    intraspecific hybridization;    invasion biology;   

DOI  :  10.1111/j.1752-4571.2012.00268.x

来源: Wiley

【 摘 要 】

Abstract

Hybridization is an important evolutionary mechanism that can increase the fitness and adaptive potential of populations. A growing body of evidence supports its importance as a key factor contributing to rapid evolution in invasive species, but the effects of hybridization have rarely been assessed in intentionally introduced biological control agents. We investigated hybrids between a Swiss and an Italian population of the beetle, Longitarsus jacobaeae, a biological control agent of Jacobaea vulgaris, by reciprocally crossing individuals in the laboratory. Phenological traits of F1 and F2 hybrid lineages showed intermediate values relative to their parental populations, with some maternal influence. Fitness of the F2 generation, measured as lifetime fecundity, was higher than that of the Italian parent in one of the lineages and higher than that of either parent in the other hybrid lineage. The increased fecundity of hybrids may benefit tansy ragwort biological control by increasing the establishment success and facilitating a more rapid population buildup in the early generations. Even though the long-term consequences of hybridization in this and other systems are hard to predict, intentional hybridization may be a useful tool in biological control strategies as it would promote similar microevolutionary processes operating in numerous targeted invasive species.

【 授权许可】

CC BY-NC   
© 2012 The Authors. Evolutionary Applications published by Blackwell Publishing Ltd.

Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.