CAJ | 학술논문

Fisher经典的性比分配理论预测:如果双亲繁殖雄性和雌性子代的代价相同,那么子代的性比应趋于平衡.然而,性比组成是长期进化的结果,常因不同因素的影响而出现偏离.文献报道猛禽由于存在不同形式的两性异型现象而导致子代性比常出现偏离,但子代性比偏离方向因种而异.本研究中我们对红隼(Falco tinnunculus)子代的性比组成进行了调查,目的是检验红隼子代性比是否受产卵日期、产卵顺序、卵重、出雏顺序或窝卵数影响.在窝水平上,红隼(雄性)的初级性比为47.0%,没有偏离0.5,但次级性比为40.8%,显著偏离0.5(p=0.029).在种群水平上,初级性比和次级性比都没有出现偏离.窝卵数和卵重影响红隼的次级性比组成,窝卵数越大,雄性后代数量越多,且发育为雄性后代的卵重较发育为雌性后代的重.初级性比和次级性比都受到产卵日期的影响,产卵越早,雄性后代比例越高.
Fisher경전적성비분배이론예측:여과쌍친번식웅성화자성자대적대개상동,나요자대적성비응추우평형.연이,성비조성시장기진화적결과,상인불동인소적영향이출현편리.문헌보도맹금유우존재불동형식적량성이형현상이도치자대성비상출현편리,단자대성비편리방향인충이이.본연구중아문대홍준(Falco tinnunculus)자대적성비조성진행료조사,목적시검험홍준자대성비시부수산란일기、산란순서、란중、출추순서혹와란수영향.재와수평상,홍준(웅성)적초급성비위47.0%,몰유편리0.5,단차급성비위40.8%,현저편리0.5(p=0.029).재충군수평상,초급성비화차급성비도몰유출현편리.와란수화란중영향홍준적차급성비조성,와란수월대,웅성후대수량월다,차발육위웅성후대적란중교발육위자성후대적중.초급성비화차급성비도수도산란일기적영향,산란월조,웅성후대비례월고.
Fisher's theory predicts equal sex ratios at the end of parental care if the cost associated with raising offspring of each sex is equal.However,sex ratios have important evolutionary consequences and are often biased for many factors.Reported sex ratios are often biased in raptors,which display various degrees of reversed sexual dimorphism,but there seems no consistent pattern in their offspring sex ratios.In this study,we investigated the offspring sex ratio of the Eurasian Kestrel(Falco tinnunculus)and tested whether the patterns of biased sex ratios were related to laying order,egg mass,hatching order,laying date or clutch size.The brood sex ratio of the Eurasian Kestrel(male)in eggs was 47.0%,not statistically biased from 0.5,but in fledglings it was 40.8%,significantly biased from 0.5(p=0.029).At population level,both primary and secondary sex ratios did not depart from parity.We found that clutch size and egg mass affected the secondary brood sex ratio,i.e.,the larger the clutch size,the larger the number of males and eggs producing sons were heavier than eggs producing daughters.Laying date affected both the primary and secondary sex ratios,and laying earlier is associated with a greater proportion of males.