Functional variation of sperm morphology in sticklebacks
Functional variation of sperm morphology in sticklebacks
复制标题
DOI：
10.1007/s00265-013-1676-5
复制
发表时间：
2014-04-01
影响因子：
2.3
通讯作者：
Zbinden, Marc
中科院分区：
文献类型：
--
作者：
Bakker, Theo C. M.;Hollmann, Michael;Zbinden, Marc
一些精子竞争的理论模型假设，在外部受精的鱼类中，精子长度与游泳速度呈正相关，而精子寿命则以牺牲精子长度为代价。很少有研究证实了这一假设。我们使用了三刺刺鱼，腹骨鱼L.，来研究精子的功能形态在这项研究中，男性的平均精子长度和受精率之间的关系进行了研究，在体外非竞争的情况下。考虑到精子释放后不同时间点的受精，并从扫描电子显微镜图像中量化精子形态。人工受精的时间序列表明，精子尾部较长的雄性受精更快，但它们的精子寿命（或活动期）较短。研究进一步表明，产生具有较大中段的精子的雄性在受精过程后期具有更大的受精机会。因此，在棘鱼中，精子形态存在功能变异，精子尾部长度与精子寿命（或活性）相权衡。
Some theoretical models of sperm competition make the assumption that in fish species with external fertilisation, sperm length relates positively to swimming speed at the expense of sperm longevity. Few studies have tested this assumption. We used the three-spined stickleback, Gasterosteus aculeatus L., to study functional sperm morphology. In this study, the relationship between males' mean sperm length and fertilisation rate was investigated in vitro in a non-competitive situation. Fertilisation at different time points after sperm release was taken into account, and sperm morphology was quantified from scanning electron microscopy images. The time series of artificial fertilisations demonstrated that males which produced sperm with a longer tail fertilised faster, but their sperm had a shorter lifespan (or activity period). It was further suggested that males that produced sperm with a larger midpiece had greater fertilisation chances later on in the fertilisation process. Thus, in sticklebacks, there exists functional variation in sperm morphology, and sperm tail length is traded off against sperm longevity (or activity).