Sperm priming response to perceived mating opportunities is reduced in male guppies with high baseline sperm production  

作　　者：Silvia CATTELAN Andrea PILASTRO 

机构地区：[1]Department of Biology, University of Padova, Padova 35131, Italy

出　　处：《Current Zoology》2018年第2期205-211,共7页动物学报（英文版）

摘　　要：Producing sperm is costly and males have been selected to strategically adjust their sperm produc- tion and/or expenditure according to the fitness return associated with a specific mating. For exam- ple, males respond to fluctuations in the mating opportunities by adjusting the number of ＂ready＂ sperm. This phenomenon is known as ＂sperm priming＂ and is interpreted as a strategy to econo- mize the investment in sperm. The cost and benefits of the sperm priming response, however, are expected to depend on a male＇s baseline sperm production （BSP） in the absence of females, because of the different risk of sperm depletion and the nonlinearly increasing costs of sperm pro- duction. We tested this prediction in 2 replicated lines of male guppies Poecilia reticulata that were artificially selected for high and low BSP. BSP has a large genetic variance and a high sire heritabil- ity in guppies, and males respond to the perceived mating opportunities by increasing the number of ＂ready＂ sperm. We investigated whether males with a different BSP differed in their sperm pri- ming response. We found that when the perceived mating opportunities increased, males from low-sperm lines had a stronger sperm priming response than those from high-sperm lines. This result suggests that adaptive plasticity in sperm priming has the potential to evolve in response to different levels of BSP. The comparison between guppy populations with different levels of sperm production would allow to test whether the pattern reported here is also observed at the interpopulation level.

关 键 词：artificial selection mate availability Poecilia reticulata sperm investment sperm priming sperm production. 

分 类 号：TP302[自动化与计算机技术—计算机系统结构] Q954.434[自动化与计算机技术—计算机科学与技术]