| 要旨トップ | 目次 | 日本生態学会第67回全国大会 (2020年3月、名古屋) 講演要旨
ESJ67 Abstract


一般講演(口頭発表) J01-06  (Oral presentation)

幼虫期資源競争から成虫期繁殖干渉への世代内並びに世代間の影響
Within- and between-generation effects from larval resource competition to adults reproductive interference

*向峯遼(筑波大学・生物科学), 徳永幸彦(筑波大学・生命環境系)
*Wataru MUKAIMINE(Biol.Sci., Univ. of Tsukuba), Yukihiko TOQUENAGA(FLES, Univ. of  Tsukuba)

Sexual selection causes reproductive interference (RI) through male harm and female resistance. Larval resource competition (RC) promotes sexual selection by adult body size increases.  Here we predicted that larval RC would alter RI intensity.  To test this prediction, we established four evolutionary experimental lines using Callosobruchus maculatus.  Experimental lines consist of a combination of two larval RC regimes (contest and scramble competition: C and S) and two adult mating regimes (polygamy and monogamy: P and M).  We measured C-value that describes the proportion of the contest type in the population, elytra length as adult body size, and fecundity in two remating treatments with no male (NOM) and a C. chinensis male (HET).  We also calculated RI intensity using fecundity in NOM and HET treatments.  As expected, C lines and P lines had higher RI intensity than S lines and M lines, respectively.  Moreover, we analyzed within- and between-generation effects from larval RC to RI using structural equation modeling (SEM).  The SEM result revealed that larval RC has causal effects on RI intensity via adult body size both within and between generations.


日本生態学会