Effects of preventing a temperature decrease during winter on reproduction of male small-egged Kajika, Cottus pollux SE
Effects of preventing a temperature decrease during winter on reproduction of male small-egged Kajika, Cottus pollux SE
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冬季防止降温对雄性小卵卡吉卡Cottus pollux SE繁殖的影响
DOI：
10.1007/s10695-020-00787-8
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发表时间：
2020
影响因子：
2.9
通讯作者：
Takaharu Natsumeda
中科院分区：
文献类型：
--
作者：
Yasunori Koya;Ryoji Fujii;Daisuke Tahara;Hidenobu Yambe;Takaharu Natsumeda
为了研究防止温度下降对雄性冷水硬骨鱼Cottus polluxSE的繁殖活动、睾丸发育、血清11-酮睾酮（11-KT）水平以及与筑巢行为相关的生理反应（即血清11-KT水平升高和膀胱尿液积聚）的影响，从11月到1月进行了观察。具体来说，雄性暴露于三种不同的冷却方案（对照，16 至 6 °C；H1，16 至 11 °C；H2，16 至 14 °C），并对结果进行比较。此外，还阐明了温度对男性生殖行为的影响。在较高水温条件下，11月至12月中旬的睾丸发育率和血清11-KT水平均高于12月中旬至1月。然而，结果表明，冬季最冷时期的高水温并没有完全抑制精子发生。相反，筑巢的生理反应受到高水温的影响，血清11-KT水平升高，膀胱中的尿液积聚受到抑制。此外，与繁殖季节的正常温度（~ 7°C）相比，在高水温（~ 14°C）下，与筑巢相关的两种行为（即身体起伏和面部展示）的频率也受到抑制。根据对筑巢的生理和行为反应，研究结果表明，防止冬季水温下降会抑制 Cottus polluxSE 的繁殖活动。
To investigate the effects of preventing temperature decrease on the reproductive activity of the male cold-water teleost,Cottus polluxSE, testicular development, serum 11-ketotestosterone (11-KT) levels, and physiological responses associated with nesting behavior (i.e., elevation of serum 11-KT levels and accumulation of urine in the urinary bladder) were observed from November to January. Specifically, males were exposed to three different cooling regimes (control, 16 to 6 °C; H1, 16 to 11 °C; H2, 16 to 14 °C), and the results were compared. In addition, the effects of temperature on male reproductive behavior were also clarified. At higher water temperature regimes, the rate of testicular development and serum 11-KT levels were both higher from November to mid-December than from mid-December to January. However, the results showed that high water temperature regimes in the coldest period of winter did not suppress spermatogenesis completely. Conversely, the physiological responses to nesting were affected by high water temperatures, with serum 11-KT levels increasing and urine accumulation in the urinary bladder being suppressed. Furthermore, frequencies of two behaviors associated with nesting, i.e., body undulation and face displays, were also suppressed under high water temperatures (~ 14 °C) compared with normal temperatures (~ 7 °C) during the breeding season. Based on the physiological and behavioral responses to nesting, findings showed that preventing a water temperature decrease during winter suppresses reproductive activity inCottus polluxSE.