Refuge size variation and potential for sperm competition in Wellington tree weta  

作　　者：Tina W.WEY Clint D. KELLY 

机构地区：[1]Departement des Sciences Biologiques, Universite du Quebec a Montreal, Montreal, Quebec H3C 3P8, Canada [2]Departement de Medecine de Famille et de Medecine D'urgence, Faculte de Medecine et des Sciences de la Sante, Universite de Sherbrooke, Quebec J1H 5N4, Canada

出　　处：《Current Zoology》2019年第3期213-223,共11页动物学报（英文版）

摘　　要：Ecological variation in resources can in flue nee the distributi on and en counter rates of potential mates and competitors and, con sequently, the opport unity for sexual selection. Factors that influence the likelihood that females mate multiply could also affect the potential for sperm competition. In Wellington tree weta (Hemideina crassidens, plural "weta"), the size of tree cavities (called galleries) used as refuges affects weta distribution and thus the opport unity for sexual selection and selection on male weaponry size. We examined the predicted effects of gallery size and male weap onry size on the potential for sperm competition. We asked if gallery size in flue need the potential for multiple mating by females and potential for sperm competition, if male weaponry size was associated with relative expected sperm competition intensity (SCI), and if estimated male mating success was correlated with pote ntial SCI. To qua ntify relative competitive envir on merits of males, we created and analyzed networks of potential competitors based on which males could have mated with the same females. We found that small galleries had higher potential for female multiple mating and higher potential for sperm competition. Size of male weaponry was not associated with expected relative SCI. Regardless of gallery size, males with more potential mates were expected to face lower expected relative sperm competition. Thus, in this system, variation in the size of available refuges is likely to in flue nee the pote ntial for sperm competiti on, in a way that we might expect to in crease variation in overall reproductive success.

关 键 词：ecological variation MATING dynamics opportunity for SPERM competition POLYANDRY sexual selection 

分 类 号：Q[生物学]