Bower-building behaviour is associated with increased sperm longevity in Tanganyikan cichlids.
Bower-building behaviour is associated with increased sperm longevity in Tanganyikan cichlids.
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坦噶尼喀丽鱼的筑凉行为与精子寿命的延长有关。
DOI：
10.1111/jeb.12522
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发表时间：
2014
影响因子：
2.1
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Morita;M.;Awata;S.;Yorifuji;M.;Ota;K.;Kohda;M. & Ochi;H.
我们研究了坦噶尼喀口育丽鱼物种的产卵行为和精子活力特征之间的进化关系，这些物种已经发展出不同的交配行为和雄性性特征。口育行为在这些鱼类中很常见，但不同的物种表现出一系列的产卵行为、凉亭结构、雄性性特征和配子释放时间。我们观察了 28 种坦噶尼喀口育慈鲷的产卵行为并比较了精子活力特征，以阐明这些特征之间的进化相关性。与不建造凉亭的物种相比，建造火山口形状产卵场的凉亭物种的精子寿命要长得多。雄性凉亭建造者在产卵前将精子释放到凉亭坑中，从射精到受精的时间更长。相反，大多数口育慈鲷将精液直接沉积到雌性口腔中，产下的卵立即被拾起并放入腔内；因此，从射精到受精的时间很短。这些观察结果表明，凉亭建造者青睐延长精子寿命。比较系统发育分析表明，筑巢行为和从射精到受精的较长时间与精子寿命的延长有关，而精子竞争等级并不起主要作用。此外，建造凉亭的行为先于精子寿命的延长。这些结果表明，由于凉亭建造者的出现而导致的精子寿命的延长可能充当了精子寿命的进化吸引子。
We investigated the evolutionary relationship between spawning behaviour and sperm motility traits among Tanganyikan mouth‐brooding cichlid species that have developed diverse mating behaviours and male sexual traits. Mouth‐brooding behaviour is common among these fish, but different species demonstrate a range of spawning behaviours, bower construction, male sexual traits and timing of gamete release. We observed spawning behaviours and compared sperm motility traits of 28 Tanganyikan mouth‐brooding cichlids to elucidate the evolutionary correlations between these traits. Sperm longevity was considerably longer in bower‐building species that construct crater‐shaped spawning sites compared with species that do not build bowers. Male bower builders released sperm in the pit of the bower prior to spawning, and the time from ejaculation to fertilization was longer. Conversely, most mouth‐brooding cichlids deposited semen directly into the female buccal cavity, and spawned eggs were immediately picked up to be placed inside the cavity; thus, the time from ejaculation to fertilization was short. These observations suggest that increased sperm longevity is favoured in bower builders. Comparative phylogenetic analyses suggested that bower‐building behaviour and greater time from ejaculation to fertilization are associated with the extension of sperm longevity, whereas sperm competition rank does not play a major role. In addition, bower‐building behaviour preceded the emergence of increased sperm longevity. These results indicate that the extension of sperm longevity as a result of the emergence of bower builders may have acted as an evolutionary attractor for sperm longevity.