Intrasexual mounting in the beetle Diaprepes abbreviatus (L.)
Intrasexual mounting in the beetle Diaprepes abbreviatus (L.)
复制标题
甲虫 Diaprepes abbreviatus (L.) 的性内安装
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
P. Landolt
中科院分区：
文献类型：
--
作者：
A. Harari;H. Brockmann;P. Landolt
短象甲有三种同性坐骑：雄性骑在其他未配对的雄性身上，雄性骑在已经交配的雄性身上，雌性骑在其他雌性身上。为了解释雄性的同性交配，有四种假说被评估：(I)较低的雄性模仿雌性，(Ii)较大的雄性占优势，这会影响较小的雄性的行为，(Iii)较小的雄性通过与较大的雄性的精子“搭便车”来获得一些生殖成功，以及(Iv)性别识别能力差。来自配偶选择和精子竞争实验的数据否定了雌性拟态、显性和精子转移假说，并支持糟糕的性别识别假说。我们测试了三个假说，以解释雌性骑马行为：(I)雌性模仿雄性行为，以减少雄性的性骚扰；(Ii)雌性骑上其他雌性，以便显得更大，从而吸引更多更大的雄性交配；以及(Iii)雌性模仿雄性。我们的择偶实验结果表明，雌性对雄性的模仿假说最好地解释了观察到的雌性上马行为。这一结果也与性别识别不良的假说相一致，该假说是许多昆虫物种中雄性和雌性性内交配行为最可能的解释。
The weevil Diaprepes abbreviatus shows three kinds of same–sex mountings: males mount other unpaired males, males mount males already engaged in copulation and females mount other females. Four hypotheses were evaluated in order to explain same–sex matings by males: (i) female mimicry by inferior males, (ii) dominance of larger males which affects the behaviour of small males, (iii) sperm transfer in which smaller males gain some reproductive success by ‘hitchhiking’ their sperm with the sperm of larger males, and (iv) poor sex recognition. Data from mate choice and sperm competition experiments rejected the female mimicry, dominance and sperm transfer hypotheses and supported the poor sex recognition hypothesis. We tested three hypotheses in order to explain female mounting behaviour: (i) females mimic male behaviour in order to reduce sexual harassment by males, (ii) females mount other females in order to appear larger and thereby attract more and larger males for mating, and (iii) female mimicry of males. The results of our mate choice experiments suggested that the female mimicry of males hypothesis best explains the observed female mounting behaviour. This result is also consistent with the poor sex recognition hypothesis which is the most likely explanation for male and female intrasexual mating behaviour in many insect species.