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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effect of high temperature on gametogenesis of the sea urchin Strongylocentrotus intermedius in the Sea of Japan, northern Hokkaido, Japan
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Effect of high temperature on gametogenesis of the sea urchin Strongylocentrotus intermedius in the Sea of Japan, northern Hokkaido, Japan

机译：高温对北海道北部日本海中海胆中间yStrongylocentrotus配子发生的影响

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摘要

A long-term (1987 to 2011) monitoring survey of recruitment of Strongylocentrotus intermedius juveniles in the Rebun Island in the Sea of Japan of northern Hokkaido revealed a significant negative correlation between juvenile density and water temperature, at times of the year when adults have growing and mature gonads. It is possible that high temperature has a negative impact on gametogenesis of S. intermedius. We investigated digestion, somatic and gonad growth, and gonad development of adult S. intermedius from the Rebun Island from June to September 2011. Experimental temperature treatments were: monthly average (CT, 11.2-19.9 degrees C), high (HT, 13.4-22.7 CC), and low (LT, 10.5-18.2 degrees C). These temperatures represent the temperature range of the last 30 years in the island. At the highest temperature in late August, digested kelp dry matter in HT was lower than in LT. Body weight in CT and LT increased significantly during the experiment. Testicular development in CT and LT progressed to the spent stage in late September, but remained at the partly spawned stage in HT. Ovaries in CT and LT developed to the premature, partly spawned, or the spent stage, from early to late September, a time when ovarian development in HT progressed from the premature to the partly spawned stages, although some ovaries retained the growing stage, indicating that oogenesis was suppressed. In CT and LT, oocyte area increased significantly from early to late August, when ovaries developed from the growing to the premature stages, due to initiation of oogenesis. In contrast, in late July, oocyte area in HT was significantly larger in CT and LT, which might be due to increased digested kelp dry matter and digestibility, which enable resources to accumulate for gametogenesis at < 20 T. Oocyte area in HT was significantly smaller in late August and in early September, reflecting delayed ovarian development, but it rapidly increased from early to late September, when kelp digestibility increased, possibly due to decreased temperature, which enables animals to compensate for delayed oocyte growth leading to oogenesis. Low gonad growth in HT, and delayed maturation and spawning would be the causal factor of decreased juvenile recruitment.
机译：对北海道北部日本海礼文岛的中间钩虫（Strongylocentrotus intermedius）少年进行的一项长期（1987年至2011年）监测调查显示，在成年时，少年密度与水温之间呈显着负相关。和成熟的性腺。高温可能会对中间链球菌的配子发生产生负面影响。我们调查了Rebun岛从2011年6月至2011年9月间中间链球菌成虫的消化，体细胞和性腺的生长以及性腺的发育。实验温度的处理方法为：月平均（CT，11.2-19.9摄氏度），高（HT，13.4摄氏度） 22.7 CC）和低温（LT，10.5-18.2摄氏度）。这些温度代表了岛上最近30年的温度范围。在八月下旬的最高温度下，HT消化的海带干物质低于LT。在实验期间，CT和LT的体重显着增加。 CT和LT的睾丸发育在9月下旬进入耗用阶段，但HT仍处于部分产卵阶段。从9月初到9月下旬，CT和LT的卵巢发育到早产，部分产卵或花期，此时HT的卵巢发育从早产发展到部分产卵，尽管有些卵巢保留了生长期，这表明卵生被抑制。在CT和LT中，卵子的面积从8月初到后期显着增加，这是由于卵子形成的开始，卵巢从生长期发展到早产。相比之下，在7月下旬，CT和LT中HT的卵母细胞面积明显更大，这可能是由于消化的海藻干物质和消化率增加，使得在<20 T时能够积累配子发生的资源。HT的卵母细胞面积显着在8月下旬和9月初较小，反映了卵巢发育延迟，但从9月初到9月下旬迅速增加，这时海带消化率增加了，可能是由于温度降低了，这使动物能够补偿导致卵子发育的延迟卵母细胞生长。 HT中性腺的低生长，以及延迟的成熟和产卵将是减少青少年募集的原因。

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