Sperm allocation in relation to female size in a semelparous salmonid.
Sperm allocation in relation to female size in a semelparous salmonid.
复制标题
DOI：
10.1098/rsos.160497
复制
发表时间：
2016-12
影响因子：
3.5
通讯作者：
Pitcher TE
中科院分区：
文献类型：
--
作者：
Makiguchi Y;Ichimura M;Kitayama T;Kawabata Y;Kitagawa T;Kojima T;Pitcher TE
为了最大限度地提高繁殖成功率，雄性必须根据潜在配偶的质量适应性地调整其精子消耗，因为它们需要时间来补充精子供应以获取后续的交配机会。因此，在雄性必须在短时间内在雌性中进行选择的交配环境中，就像单胎物种（在激烈竞争的短期繁殖季节后死亡）的情况一样，精子分配的选择有望成为影响雄性繁殖成功的强大选择因素。我们通过开发一种新方法来确定产卵期间每次射精分配的精子数量，定量研究了鲑鱼的精子分配模式与感知的雌性质量的关系。我们在实验通道中，在没有雄性与雄性竞争的情况下，研究了精子消耗与配对雌性体型（卵子数量和卵子质量的代表）之间的关系。每次产卵事件释放的精子的估计量与配对雌性的大小呈正相关。然而，雌性参与产卵事件的次数（这会减少她在随后的每次产卵中产卵的数量）并不会影响这种关系。这些结果为精子分配假说的预测提供了支持，雄性鲑鱼确实根据配对雌性鲑鱼第一次产卵事件的体型大小来节省精子消耗，但雄性鲑鱼高估或无法评估雌性超出体型的质量，并在与先前产卵的雌性配对时提供比理论上更多的精子。总体而言，假设雌性体型是质量的诚实指标，观察到的鲑鱼精子分配模式似乎适合最大限度地提高生殖成功率，尽管在检查精子分配策略时应考虑生殖季节期间雌性质量的时间变化。
To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities. Therefore, in mating contexts where males must choose among females in a short period of time, as is the case with semelparous species (which die after one intensely competitive short duration breeding season), selection on sperm allocation can be expected to be a powerful selective agent that shapes the male reproductive success. We quantitatively investigated sperm allocation patterns in chum salmon in relation to perceived female quality by developing a novel method for determining the amount of sperm allocated per ejaculate during spawning bouts. We examined the relationship between sperm expenditure and the body size of paired females (a proxy of egg number and egg quality) in the absence of male–male competition in an experimental channel. The estimated amount of sperm released per spawning event was positively correlated with the size of paired females. However, the number of spawning events a female participated in, which reduces the number of eggs she spawns in each subsequent bout, did not affect this relationship. These results provide support for predictions arising from the sperm allocation hypothesis, male salmon do economize their sperm expenditure in accordance with paired female body size as predicted for their first spawning event, but males overestimate or are unable to assess the quality of females beyond size and provide more sperm than they should in theory when paired with a female that spawned previously. Overall, the observed sperm allocation pattern in chum salmon appears to be adapted to maximize reproductive success assuming female size is an honest indicator of quality, although temporal changes in a female's quality during a reproductive season should be considered when examining sperm allocation strategies.
登录
查看更多内容
影响因子：
2
作者：
Makiguchi, Y.;Sugie, Y.;Naito, Y.
通讯作者：
Naito, Y.
影响因子：
56.9
作者：
Heath, DD;Heath, JW;Fox, CW
通讯作者：
Fox, CW
影响因子：
1.4
作者：
BEACHAM, TD;WITHLER, FC;MORLEY, RB
通讯作者：
MORLEY, RB
影响因子：
2
作者：
Berejikian, BA;Tezak, EP;LaRae, AL
通讯作者：
LaRae, AL
影响因子：
2.9
作者：
DEWSBURY, DA
通讯作者：
DEWSBURY, DA