Effects of warm acclimation on physiology and gonad development in the sea urchin Evechinus chloroticus
Effects of warm acclimation on physiology and gonad development in the sea urchin Evechinus chloroticus
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DOI：
10.1016/j.cbpa.2016.03.020
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发表时间：
2016-08-01
影响因子：
2.3
通讯作者：
Sewell, Mary A.
中科院分区：
文献类型：
--
作者：
Delorme, Natali J.;Sewell, Mary A.
通过成年海胆在 18 摄氏度（年平均温度）和 24 摄氏度（夏季环境温度（21 摄氏度）+ 3 摄氏度）环境下 90 天的摄食、呼吸、生长和性腺生长来评估新西兰海胆 Evechinus chromaticus 的生理机能。具有代表同化效率率的测量参数用于计算每种处理的生长范围（SfG）。所有生理参数在 24 摄氏度时均受到负面影响，显示摄食率下降，这与驯化期末期的生长和性腺发育负增长相一致，呼吸率下降表明代谢抑制。驯化期后性腺样本的组织学也显示，在24℃驯化的动物中没有配子物质。所有在24℃驯化的动物均出现负生长，与计算的SfG不同，这表明动物有足够的能量用于生产。结果表明，计算出的棘皮动物 SfG 应该与个体生长的实际测量值一起使用，因为当动物暴露在压力条件下时，SfG 本身可能会低估海洋变暖的实际影响。总体而言，考虑到在较高温度下观察到的绿叶藻繁殖能力的完全丧失，海水温度的升高可能会极大地影响该物种北方种群的持续存在，从而导致潮下生态系统的流动效应。 (C) 2016 Elsevier Inc. 保留所有权利。
The physiology of the New Zealand sea urchin Evechinus chloroticus was evaluated through feeding, respiration, growth and gonad growth in adult animals acclimated for 90 days at 18 degrees C (annual mean temperature) and 24 degrees C (ambient summer temperature (21 degrees C) + 3 degrees C). Measured parameters with representative rates of assimilation efficiency were used to calculate scope for growth (SfG) for each treatment. All physiological parameters were negatively affected at 24 degrees C, showing a decrease in feeding rate which coincided with negative growth and gonad development at the end of the acclimation period, and a decrease in respiration rate suggesting metabolic depression. Histology of gonad samples after the acclimation period also showed no gametic material in animals acclimated at 24 degrees C. All animals acclimated at 24 degrees C had negative growth, differing from the calculated SfG which indicated that the animals had sufficient energy for production. The results suggest that calculated SfG in echinoderms should be used together with actual measurements of growth in individuals as, by itself, SfG may underestimate the actual effect of ocean warming when animals are exposed to stressful conditions. Overall, considering the total loss of reproductive output observed in E. chloroticus at higher temperatures, an increase in seawater temperature could dramatically influence the persistence of northern populations of this species, leading to flow-on effects in the subtidal ecosystem. (C) 2016 Elsevier Inc. All rights reserved.