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Sperm allocation strategies in a sperm heteromorphic insect

Current Zoology 2020年第3期66卷 285-292页

作者： Kambiz ESFANDI Xiong Z.HE Qiao WANG School of A griculture and Environment Massey UniversityPrivate Bag 11222Palmerston NorthNew Zealand The New Zealand Institute fo r Plant&Food Research Limited Private Bag 11600Palmerston NorthNew Zealand

Theories predict that in polyandrous species,the focal male should increase sperm allocation per mate in the presence of rivals to gain greater share of paternity,but in the presence of additional mates,he should reduce sperm allocation per mate to save sperm for insemination of more ***,empirical findings are often inconsistent and reasons behind are ***,many studies use copulation duration as an estimate of the number of sperm ***,empirical evidence for such assumption is largely ***,we used a sperm heteromorphic insect Ephestia kuehniella whose males produce two types of sperm,eupyrenes(fertile)and apyrenes(nonfertile),to test these *** allowed focal males to detect chemical and acoustic but no tactile cues from rivals or additional mates both before and during mating and measured copulation duration and sperm allocation in successive *** demonstrate that males transfer significantly more eupyrenes per mate in the presence of rivals and that the sperm allocation pattern persists in successive copulations under this ***,males do not adjust apyrene allocation in response to rivals probably because apyrenes play a relatively minor role in male reproductive *** to a previous study,focal males do not respond to additional mates most likely due to the lack of tactile cues in the present *** reveal that sperm allocation is not a function of copulation duration in this insect for spermatophore formation and delivery occupy most of copulation duration and sperm transfer is complete near the end of copulation.

关键词： Sperm allocation sperm competition copulation duration socio-sexual environment

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