Mating Systems and Sperm Competition in Insects

昆虫的交配系统和精子竞争

• 批准号: 63540518
• 负责人: TSUBAKI Yoshitaka
• 金额: $ 0.96万
• 依托单位: National Institute for Environmental Studies (1990)Nagoya University (1988-1989)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540518/
• 关键词: Sperm competition; Damselfly; Army worm; Spermatophore; Phase variation; Remating; Melon fly; Sperm longevity; 鱗翅目; 交尾間隔; 精子優先度; 精子の寿命; 交尾順序; 精包; 昆虫; 配偶システム; 不妊化; 交尾戦略

Mechanisms of sperm competition in three taxonomical groups of insects was studied in order to understand their mating systems.1. Males of the damselfly Mnais pruinosa pruinosa were observed to use three different tactics to secure mates. The mean duration of copulation differed between the three observed tactics and resulted in varying degrees of sperm removal and insemination. A variety of factors which might influence copulation duration were invesitgated. The most important was the location of the site at which males captured thier mates.2. Males of the melon fly Dacus cucurbitae copulate for 10 hours or more, usually starting at dawn and terminating at dusk. The amount of sperm transferred to a female increased with time after mounting. Mating duration was a major determinant of paternity when females were doubly mated. However, "last male's advantage" in sperm precedence was observed when the mating interval was longer than 10 days. Counting the number of sperm in spermatheca under a microscope, mean longevity of sperm was estimated as 17 days. As a proportion of the first male's sperm die before a second mating has occurred, sperm precedence value would increase without any sperm displacement mechanism.3. Variation in spermatophore size was studied in relation to larval rearing density in the armyworm, Leucania separata. Males grew under a high density condition produced larger spermatophore than solitary males, in spite that the body size was not different between them. Spermatophore size increased with male age or time interval between previous and current matings. Females that received large spermatophore delayed remating longer than those receiving small ones.

项目成果

Siva-Jothy, M. T and Tsubaki, Y.: "Variation in copulation duration in Mnais pruinosa pruinosa Selys (Odonata : Calopterigidae). 2. Causal factors." Behav. Ecol. Sociobiol.25. 261-267 (1989)

Siva-Jothy, M. T 和 Tsubaki, Y.：“Mnais pruinosa pruinosa Selys（蜻蜓目：Caopterigidae）交配持续时间的变化。2. 因果因素。”

Tsubaki,Y.and Sokei,Y.: "Prolonged mating in the melon fly,Dacus cucurbitae(Diptera:Tephritidae):Competition for fertilization by sperm loading." Researches of Population Ecology. 30. 343-352 (1988)

Tsubaki, Y. 和 Sokei, Y.：“瓜蝇 Dacus cucurbitae（双翅目：实蝇科）的延长交配：通过精子装载进行受精的竞争。”

He,Y.and Tsubaki,Y.: "Variation in spermatophore size in the army worm,Ieucania separata Walker in association with phase variation."

He,Y. 和 Tsubaki,Y.：“粘虫 Ieucania separata Walker 精囊大小的变化与相位变化相关。”

He,Y.and Tsubaki,Y.: "Effects of spermatophore size on female remating in the army worm,Leucania separata Walker,with reference to phase variation."

He,Y. 和 Tsubaki,Y.：“精囊大小对粘虫 Leucania separata Walker 雌性再交配的影响，参考相位变化。”

Tsubaki,Y.and Yamagishi,M.: "Longevity of sperm within the female in the melon fly,Dacus cucurbitae Coquillett(Diptera:Tephritidae)" J.Insect Behavior.

Tsubaki, Y. 和 Yamagishi, M.：“瓜蝇雌性精子的寿命，Dacus cucurbitae Coquillett（双翅目：实蝇科）”J.昆虫行为。