Sperm motility and fertilisation success in an acidified and hypoxic environment
Sperm motility and fertilisation success in an acidified and hypoxic environment
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DOI：
10.1093/icesjms/fsv171
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发表时间：
2016-02-01
影响因子：
3.3
通讯作者：
Caldwell, Gary S.
中科院分区：
文献类型：
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作者：
Graham, Helen;Rastrick, Samuel P. S.;Caldwell, Gary S.
许多海洋物种的分布和功能在很大程度上取决于非生物驱动因素对其繁殖和早期发育的影响，包括与二氧化碳浓度升高和全球气候变化有关的驱动因素。因此，许多研究调查了pCO（2）升高对一系列生殖参数的影响，包括精子活力和受精成功。迄今为止，这些研究中的大多数尚未研究其他非生物驱动因素可能产生的协同效应，例如与气候变化有关的缺氧事件频率增加。因此，本研究是新颖的，在未来的高CO2海洋缺氧事件可能对繁殖的影响进行评估。具体来说，这项研究评估了暴露于pCO（2）升高6个月的海胆Paracentrotus livid的精子活力和受精成功率。从这些预驯化的个体中提取的配子进行缺氧条件下模拟缺氧事件在未来的高CO2海洋。精子游泳速度在pCO（2）升高时增加，在低氧条件下降低，导致pCO（2）升高和低氧处理与对照组大致相当。pCO（2）增加和缺氧对活动精子的百分比也有联合的负面影响。pCO（2）升高对受精成功有显著的负面影响，当与模拟缺氧事件结合时，影响更大。这可能会影响种群的补充，进而降低这一具有生态和经济重要性的生态系统工程师的密度，从而可能影响生物多样性和生态系统服务。
The distribution and function of many marine species is largely determined by the effect of abiotic drivers on their reproduction and early development, including those drivers associated with elevated CO2 and global climate change. A number of studies have therefore investigated the effects of elevated pCO(2) on a range of reproductive parameters, including sperm motility and fertilisation success. To date, most of these studies have not examined the possible synergistic effects of other abiotic drivers, such as the increased frequency of hypoxic events that are also associated with climate change. The present study is therefore novel in assessing the impact that an hypoxic event could have on reproduction in a future high CO2 ocean. Specifically, this study assesses sperm motility and fertilisation success in the sea urchin Paracentrotus livid us exposed to elevated pCO(2) for 6 months. Gametes extracted from these pre-acclimated individuals were subjected to hypoxic conditions simulating an hypoxic event in a future high CO2 ocean. Sperm swimming speed increased under elevated pCO(2) and decreased under hypoxic conditions resulting in the elevated pCO(2) and hypoxic treatment being approximately equivalent to the control. There was also a combined negative effect of increased pCO(2) and hypoxia on the percentage of motile sperm. There was a significant negative effect of elevated pCO(2) on fertilisation success, and when combined with a simulated hypoxic event there was an even greater effect. This could affect cohort recruitment and in turn reduce the density of this ecologically and economically important ecosystem engineer therefore potentially effecting biodiversity and ecosystem services.