Sperm characteristics associated with different male reproductive tactics in bluegills (Lepomis macrochirus)
Sperm characteristics associated with different male reproductive tactics in bluegills (Lepomis macrochirus)
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DOI：
10.1007/s002650000268
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发表时间：
2000-12-01
影响因子：
2.3
通讯作者：
Montgomerie, R
中科院分区：
文献类型：
--
作者：
Leach, B;Montgomerie, R
我们研究了父母和运动鞋男性蓝鳃太阳鱼（Lepomis macrochirus），殖民地筑巢太阳鱼（家庭Centrarchidae）与男性父母的照顾和高发病率的戴绿帽子的运动鞋和卫星男性的精子的可用性和活力。我们发现运动鞋和父母之间的精子长度和游泳速度，或精子活动的百分比和持续时间没有差异。然而，在运动鞋精液中，精子的浓度比亲本精液高出近50%（分别为16.5 x 10（6）和11.5 x 10（6）精子/穆尔）。尽管精子浓度存在这种差异，但运动鞋的剥离精液中的精子数量比父母少了近4亿个（仅为32%），因为它们的剥离精液体积要小得多（仅为父母的19%）。因此，除非运动鞋可以通过释放更多的精子或在产卵时更接近卵子来补偿，否则它们可能在精子竞争中处于不利地位。我们讨论了这些结果在这个物种的替代生殖行为的进化模型，并建议戴绿帽子可能是最好的坏的情况。
We examined the availability and motility of sperm from parental and sneaker male bluegills (Lepomis macrochirus), a colonially nesting sunfish (Family Centrarchidae) with male parental care and a high incidence of cuckoldry by both sneaker and satellite males. We found no differences between sneakers and parentals in length and swimming speed of sperm, or percent and duration of sperm activity. In sneaker milt, however, sperm was almost 50% more concentrated than in parental milt (16.5 x 10(6) vs 11.5 x 10(6) sperm/mul of milt, respectively). Despite this difference in sperm concentration, stripped ejaculates from sneakers contained almost 400 million fewer sperm (only 32% as many sperm) than those from parentals due to their much smaller stripped ejaculate volumes (only about 19% that of parentals). Thus unless sneakers can compensate by releasing more sperm or gaining closer proximity to eggs at the time of spawning, they may be at a disadvantage with respect to sperm competition. We discuss these results in relation to models for the evolution of alternative reproductive behaviours in this species and suggest that the cuckolders may be making the best of a bad situation.