Coevolving parasites and population size shape the evolution of mating behaviour

BMC Evolutionary Biology

Oliver Y Martin²  Camillo Bérénos¹  Niels AG Kerstes² 

[1] University of Edinburgh, Institute of Evolutionary Biology, Edinburgh, EH9 3JT, UK;ETH Zürich, Institute of Integrative Biology, Experimental Ecology, Universitätstrasse 16, CH-8092, Zürich, Switzerland

关键词: Polyandry;    Multiple mating;    Genetic variation;    Red queen hypothesis;    Host-parasite coevolution;   

Others  :  1130088
DOI  :  10.1186/1471-2148-13-29

 received in 2012-07-18, accepted in 2013-01-30,  发布年份 2013

【 摘 要 】

Background

Coevolution with parasites and population size are both expected to influence the evolution of mating rates. To gain insights into the interaction between these dual selective factors, we used populations from a coevolution experiment with the red flour beetle, Tribolium castaneum, and its microsporidian parasite, Nosema whitei. We maintained each experimental population at two different population sizes. We assayed the mating behaviour of both males and females from coevolved and paired non-coevolved control populations after 24 generations of coevolution with parasites.

Results

Males from large, coevolved populations (i.e. ancestors were exposed to parasites) showed a reduced eagerness to mate compared to males from large, non-coevolved populations. But in small populations, coevolution did not lead to decreased male mating rates. Coevolved females from both large and small populations appeared to be more willing to accept mating than non-coevolved females.

Conclusions

This study provides unique, experimental insights into the combined roles of coevolving parasites and population size on the evolution of mating rate. Furthermore, we find that males and females respond differently to the same environmental conditions. Our results show that parasites can be key determinants of the sexual behaviour of their hosts.

【 授权许可】

   
2013 Kerstes et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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