Nesting behavior is associated with increased urinary volume in the urinary bladder during the reproductive period in small-egged Kajika, Cottus pollux SE
Nesting behavior is associated with increased urinary volume in the urinary bladder during the reproductive period in small-egged Kajika, Cottus pollux SE
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小蛋卡吉卡 (Cottus pollux SE) 的筑巢行为与繁殖期膀胱尿量增加有关
DOI：
10.1007/s10228-015-0475-6
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发表时间：
2016
影响因子：
1.2
通讯作者：
Daisuke Tahara
中科院分区：
文献类型：
--
作者：
Yasunori Koya;Ryoji Fujii;Hidenobu Yambe;Daisuke Tahara
我们发现，雄性小卵 Kajika,CottuspolluxSE sensu Yokoyama 和 Goto (2005) 在产卵基质下筑巢时，其膀胱中保留了大量尿液（约占体重的 1%）。尿液量的增加发生在雄性被转移到筑巢池三天后。在雄性被转移到筑巢池后，雄性的血清11-酮睾酮（11-KT）浓度也增加了大约两倍。虽然尿量的增加仅在生殖期（12 月下旬）观察到，但与筑巢相关的血清 11-KT 浓度从基础水平的增加发生在生精期（10 月至 12 月中旬）到生殖期（12 月下旬）期间。这些发现表明，筑巢雄性的尿液在繁殖中发挥作用，而血清 11-KT 水平的增加可能与社会地位/统治地位有关。与最初的对照值相比，由于筑巢而增加的尿液中的 11-KT 含量大约增加了六倍，这表明筑巢的雄性 Kajika 的尿液可能对雌性和/或其他雄性起到了社交信号的作用。
We found that male small-egged Kajika,CottuspolluxSE sensu Yokoyama and Goto (2005), retained a large volume of urine (approximately, 1 % body weight) in their urinary bladder while nesting under spawning substrate. This increase in urine volume occurred three days after the males were transferred to the nesting tank. Serum 11-ketotestosterone (11-KT) concentrations of males also increased approximately twofold after the males were transferred to the nesting tank. While this increase in the urinary volume was observed only during the reproductive period (late December), the increase in serum 11-KT concentration from the basal levels associated with nesting occurred from the spermatogenic period (from October to mid-December) to the reproductive period (late December). These findings suggest that the urine of nesting males plays a role in reproduction, whereas the increase in serum 11-KT levels may be associated with social status/dominance. The increased urine due to nesting contained an approximately sixfold level of 11-KT compared to the initial control values, suggesting that the urine of nesting male Kajika may have functioned as social signals to females and/or to other males.