An empirical test of the bet-hedging polyandry hypothesis: Female red flour beetles avoid extinction via multiple mating

被引：9

作者：

Matsumura, Kentarou ^{[1
]}

Miyatake, Takahisa ^{[2
]}

Yasui, Yukio ^{[1
]}

机构：

[1] Kagawa Univ, Fac Agr, Lab Entomol, Takamatsu, Kagawa, Japan

[2] Okayama Univ, Lab Evolutionary Ecol, Grad Sch Environm & Life Sci, Okayama, Japan

来源：

ECOLOGY AND EVOLUTION | 2021年 / 11卷 / 10期

基金：

日本学术振兴会;

关键词：

bet‐ hedging; extinction avoidance; monandry; polyandry; risk spreading; Tribolium castaneum;

D O I：

10.1002/ece3.7418

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Bet-hedging via polyandry (spreading the extinction risk of the female's lineage over multiple males) may explain the evolution of female multiple mating, which is found in a wide range of animal and plant taxa. This hypothesis posits that females can increase their fitness via polyandrous mating when "unsuitable" males (i.e., males causing reproductive failure for various reasons) are frequent in the population and females cannot discriminate such unsuitable mates. Although recent theoretical studies have shown that polyandry can operate as a bet-hedging strategy, empirical tests are scarce. In the present study, we tested the bet-hedging polyandry hypothesis by using the red flour beetle Tribolium castaneum. We compared female reproductive success between monandry and polyandry treatments when females mated with males randomly collected from an experimental population, including 20% irradiated (infertile) males. In addition, we evaluated geometric mean fitness across multiple generations as the index of adaptability of bet-hedging traits. Polyandrous females showed a significantly higher egg hatching rate and higher geometric mean fitness than monandrous females. These results strongly support the bet-hedging polyandry hypothesis.

引用

页码：5295 / 5304

页数：10

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