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首页> 外文期刊>Marine ecology progress series >Key biological responses over two generations of the sea urchin Echinometra sp. A under future ocean conditions
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Key biological responses over two generations of the sea urchin Echinometra sp. A under future ocean conditions

机译：两代海胆埃基咪胶质物研究的主要生物反应。未来的海洋状况

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摘要

Few studies have investigated the effects of ocean warming and acidification on marine benthic organisms over ecologically relevant time scales. We used an environmentally controlled coral reef mesocosm system to assess growth and physiological responses of the sea urchin species Echinometra sp. A over 2 generations. Each mesocosm was controlled for temperature and pCO(2) over 29 mo under 3 climate change scenarios (present day and predicted states in 2050 and 2100 under RCP 8.5). The system maintained treatment conditions including annual temperature cycles and a daily variation in pCO(2). Over 20 mo, adult Echinometra exhibited no significant difference in size and weight among the treatments. Growth rates and respiration rates did not differ significantly among treatments. Urchins from the 2100 treatment had elevated ammonium excretion rates and reduced O-2:N ratios, suggesting a change in catabolism. We detected no difference in spawning index scores or oocyte size after 20 mo in the treatments, suggesting that gonad development was not impaired by variations in pCO(2) and temperature reflecting anticipated climate change scenarios. Larvae produced from experimentally exposed adults were successfully settled from all treatments and raised for 5 mo inside the mesocosm. The final size of these juveniles exhibited no significant difference among treatments. Overall, we demonstrated that the mesocosm system provided a near natural environment for this urchin species. Climate change and ocean acidification did not affect the benthic life stages investigated here. Importantly, in previous short-term (weeks to months) experiments, this species exhibited reductions in growth and gonad development, highlighting the potential for short-term experiments with non-acclimated animals to yield contrasting, possibly erroneous results.
机译：少数研究研究了海洋变暖和酸化对海洋底栖生物在生态相关的时间尺度上的影响。我们使用了环保珊瑚礁中核科学系统来评估海胆物种Echinometra Sp的生长和生理反应。超过2代。在3个气候变化情景下，每次Mesocosm在39 Mo下控制温度和PCO（2）（在2050年2050年的预测状态下，在RCP 8.5下的预测状态）下。该系统维持治疗条件，包括年温循环和PCO（2）的日常变异。成年echInometra超过20℃，治疗中的大小和重量没有显着差异。治疗中的增长率和呼吸率没有显着差异。来自2100种治疗的核心含量升高，铵排泄率升高，降低了O-2：N比率，表明分解代谢的变化。在治疗中，我们检测到产卵指数评分或卵母细胞大小没有差异，这表明GONAD开发不会因PCO（2）和温度的变化而受到损害，反映预期的气候变化情景。由实验暴露的成人产生的幼虫从所有处理中成功沉淀并在中核瘤内升高5μm。这些青少年的最终规模在治疗中没有显着差异。总的来说，我们证明了中科姆系统为这种白葡萄种类提供了近乎自然环境。气候变化和海洋酸化并没有影响此处调查的底栖生命阶段。重要的是，在先前的短期内（数周到几个月）实验中，该物种表现出增长和Gonad开发的减少，突出了非适应动物的短期实验的可能性，以产生对比，可能是错误的结果。

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