Local and neighboring patch conditions alter sex‐specific movement in banana weevils

Ecology and Evolution

Dominique Carval²  Benjamin Perrin²  Pierre-François Duyck¹ 

[1] CIRAD, UMR PVBMT, Saint-Pierre, La Réunion, France;CIRAD, UPR GECO, Le Lamentin, Martinique, France

关键词: Behavioral heterogeneity;    Cosmopolites sordidus;    density‐dependent movement;    intrasexual competition;    sex ratio;    sex‐biased movement;   

DOI  :  10.1002/ece3.1818

来源: Wiley

【 摘 要 】

Abstract

Understanding the mechanisms underlying the movements and spread of a species over time and space is a major concern of ecology. Here, we assessed the effects of an individual's sex and the density and sex ratio of conspecifics in the local and neighboring environment on the movement probability of the banana weevil, Cosmopolites sordidus. In a “two patches” experiment, we used radiofrequency identification tags to study the C. sordidus movement response to patch conditions. We showed that local and neighboring densities of conspecifics affect the movement rates of individuals but that the density-dependent effect can be either positive or negative depending on the relative densities of conspecifics in local and neighboring patches. We demonstrated that sex ratio also influences the movement of C. sordidus, that is, the weevil exhibits nonfixed sex-biased movement strategies. Sex-biased movement may be the consequence of intrasexual competition for resources (i.e., oviposition sites) in females and for mates in males. We also detected a high individual variability in the propensity to move. Finally, we discuss the role of demographic stochasticity, sex-biased movement, and individual heterogeneity in movement on the colonization process.

【 授权许可】

CC BY   
© 2015 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.