Larger ejaculate volumes are associated with a lower degree of polyandry across bushcricket taxa
Larger ejaculate volumes are associated with a lower degree of polyandry across bushcricket taxa
复制标题
射精量越大，丛林蟋蟀类群的一妻多夫程度越低
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
K. Vahed
中科院分区：
文献类型：
--
作者：
K. Vahed
在许多昆虫中，包括蟋蟀（Tettigoniidae），雄性已知会在射精中转移抑制雌性进一步交配的接受性的物质，但尚未确定这些物质是否会减少雌性的一妻多夫生活程度。本研究的目的是检验这一假设，即较大的射精量应与较低程度的一妻多夫跨越tettigoniid类群，控制男性体重和生育。射精质量，精子数量，婚姻礼物质量和男性质量的数据主要来自文献。一妻多夫的程度为14种欧洲蟋蟀估计通过计算的数量spermatodoses内的领域捕获的女性的受精囊对他们的成年寿命结束。从文献中获得了另外四个物种的数据。数据进行了分析，通过使用物种回归和独立的对比，以控制繁殖。多元回归分析显示，正如预测的那样，一妻多夫的程度和射精质量之间有显着的负相关，相对于男性的体重，跨蟋蟀类群。然而，彩礼的大小和精子数量，并没有进一步的一妻多夫的程度的种间变异。一个积极的关系被发现，在蟋蟀类群，相对的婚礼礼物的大小和相对射精质量之间，表明较大的婚礼礼物，让男性克服女性的阻力，接受大射精。这似乎是第一个比较证据表明，男性可以操纵一生的程度，一妻多夫的配偶通过转让大量的射精。
In numerous insects, including bushcrickets (Tettigoniidae), males are known to transfer substances in the ejaculate that inhibit the receptivity of females to further matings, but it has not yet been established whether these substances reduce the lifetime degree of polyandry of the female. The aim of this study was to test the hypothesis that larger ejaculate volumes should be associated with a lower degree of polyandry across tettigoniid taxa, controlling for male body mass and phylogeny. Data on ejaculate mass, sperm number, nuptial gift mass and male mass were taken primarily from the literature. The degree of polyandry for 14 species of European bushcrickets was estimated by counting the number of spermatodoses within the spermathecae of field-caught females towards the end of their adult lifespans. Data for four further species were obtained from the literature. Data were analysed by using both species regression and independent contrasts to control for phylogeny. Multiple regression analysis revealed that, as predicted, there was a significant negative association between the degree of polyandry and ejaculate mass, relative to male body mass, across bushcricket taxa. Nuptial gift size and sperm number, however, did not contribute further to interspecific variation in the degree of polyandry. A positive relationship was found, across bushcricket taxa, between relative nuptial gift size and relative ejaculate mass, indicating that larger nuptial gifts allow the male to overcome female resistance to accepting large ejaculates. This appears to be the first comparative evidence that males can manipulate the lifetime degree of polyandry of their mates through the transfer of large ejaculates.