Effect of age‐based and environment‐based cues on reproductive investment in Gambusia affinis

Ecology and Evolution

Eric J. Billman¹ 

[1] Department of Biology, Brigham Young University, Provo, Utah

关键词: Cost of reproduction;    mosquitofish;    phenotypic trajectory analysis;    reproductive restraint;    reproductive value;    terminal investment;   

DOI  :  10.1002/ece3.1055

来源: Wiley

【 摘 要 】

Abstract

We examined the multivariate life-history trajectories of age 0 and age 1 female Gambusia affinis to determine relative effects of age-based and environment-based cues on reproductive investment. Age 0 females decreased reproductive investment prior to the onset of fall and winter months, while age 1 females increased reproductive investment as the summer progressed. The reproductive restraint and terminal investment patterns exhibited by age 0 and age 1 females, respectively, were consistent with the predictions from the cost of reproduction hypothesis. Age 0 females responded to environment-based cues, decreasing reproductive investment to increase the probability of overwinter survival and subsequent reproductive opportunities in the following summer. Age 1 females responded to age-based cues, or the proximity of death, increasing investment to current reproduction as future reproductive opportunities decreased late in life. Thus, individuals use multiple cues to determine the level of reproductive investment, and the response to each cue is dependent on the age of an individual.

【 授权许可】

CC BY   
© 2014 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.