穆景利;靳非;赵化德;郑楠;臧鲲鹏;王菊英;

• 1:国家海洋局近岸海洋生态环境重点实验室国家海洋环境监测中心

摘要(Abstract)：

水体低氧已是全球性生态问题,常以季节性、偶发性和昼夜间等不同形式存在于不同的水体中。长期低氧可影响鱼类正常的生长和繁殖,但鱼类早期生活阶段暴露于不同形式的低氧后,后期的生长和繁殖是否会受到不利影响,目前研究甚少。本研究在实验室模拟了连续低氧(2.8 mg·L~(-1)DO)(H1)、昼夜低氧(H2)和发生在胚胎器官形成时期的偶发性低氧(H3)等3种情景对青鳉胚胎的发育影响,评估了这一早期暴露对青鳉后期的生长、存活和繁殖的影响。我们发现,3种低氧方式都可以显著延长青鳉胚胎的孵化周期,引起胚胎卵黄囊吸收和鱼鳔发育异常;暴露结束120 d后,H1组青鳉成鱼的畸形率显著升高、存活率和生长速度都显著下降;H1、H2和H3组中成鱼的雌雄比都发生了改变,鱼群中以雄鱼为主,且产卵量和受精率都显著下降。结果表明,鱼类早期胚胎发育阶段所受到的低氧暴露可对后期生长和繁殖产生不利影响,对子代补充和种群稳定产生重要影响;鱼类关键发育期所经历的低氧事件,以及昼夜低氧事件所产生的生态后果不容忽视。

关键词(KeyWords)： 低氧;青鳉鱼;早期生活阶段暴露;繁殖毒性;性别差异;子代影响

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41476096;41106089);; 国家海洋局专项:全球变化与海气相互作用

作者(Author): 穆景利;靳非;赵化德;郑楠;臧鲲鹏;王菊英;

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