Puisay Antoine, Pilon Rosanne, Hédouin Laetitia
USR3278 EPHE CNRS UPVD CRIOBE, BP 1013, 98729 Papetoai, Moorea, French Polynesia; Laboratoire d'Excellence Corail, French Polynesia.
USR3278 EPHE CNRS UPVD CRIOBE, BP 1013, 98729 Papetoai, Moorea, French Polynesia; Laboratoire d'Excellence Corail, French Polynesia.
Chemosphere. 2015 Feb;120:563-7. doi: 10.1016/j.chemosphere.2014.09.041. Epub 2014 Oct 19.
Pollution by heavy metals remains today an important threat to the health of humans and ecosystems, but there is still a paucity of data on the response of early life stages of key organisms. In this context, the present work assessed the fertilization success rate of two Acropora species (A. cytherea and A. pulchra) from the French Polynesia reefs exposed to six increasing copper concentrations in seawater. The two species showed a relatively high tolerance to copper (4h30-EC50 was 69.4 ± 4.8 μg L(-1) and 75.4 ± 6.4 μg L(-1) for A. cytherea and A. pulchra, respectively). As Cu concentration increases, an increasing proportion of deformed embryos was recorded (67.6% and 58.5% for A. cytherea and A. pulchra, respectively, at 220 μg Cu L(-1)). These results demonstrated thus, that high levels of copper could negatively impair the normal fertilization process of coral gametes and therefore alter the renewal of coral populations. Since the two Acropora species investigated in this study displayed a high resistance to copper, these results should be considered in the context of multiple stressors associated with climate change, where rising temperature or ocean acidification may significantly exacerbate copper toxicity.
如今，重金属污染仍然是对人类健康和生态系统的一个重要威胁，但关于关键生物幼体阶段反应的数据仍然匮乏。在此背景下，本研究评估了来自法属波利尼西亚珊瑚礁的两种鹿角珊瑚（多孔鹿角珊瑚和美丽鹿角珊瑚）在海水中铜浓度逐渐升高至六种水平时的受精成功率。这两个物种对铜表现出相对较高的耐受性（多孔鹿角珊瑚和美丽鹿角珊瑚的4小时半效应浓度分别为69.4±4.8微克/升和75.4±6.4微克/升）。随着铜浓度的增加，记录到畸形胚胎的比例也在增加（在220微克铜/升时，多孔鹿角珊瑚和美丽鹿角珊瑚分别为67.6%和58.5%）。因此，这些结果表明，高浓度的铜会对珊瑚配子的正常受精过程产生负面影响，从而改变珊瑚种群的更新。由于本研究中调查的两种鹿角珊瑚物种对铜具有较高的抗性，在与气候变化相关的多重压力因素背景下应考虑这些结果，其中温度升高或海洋酸化可能会显著加剧铜的毒性。
