Thomas Peter, Rahman Md Saydur, Picha Matthew E, Tan Wenxian
Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA.
Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA.
Mar Pollut Bull. 2015 Dec 15;101(1):182-192. doi: 10.1016/j.marpolbul.2015.11.001. Epub 2015 Nov 4.
The long-term impacts of recent marked increases in the incidence and extent of hypoxia (dissolved oxygen <2 mg/L) in coastal regions worldwide on fisheries and ecosystems are unknown. Reproductive impairment was investigated in Atlantic croaker collected in 2010 from the extensive coastal hypoxic region in the northern Gulf of Mexico. Potential fecundity was significantly lower in croaker collected throughout the ~20,000 km(2) hypoxic region than in croaker from normoxic sites. In vitro bioassays of gamete viability showed reductions in oocyte maturation and sperm motility in croaker collected from the hypoxic sites in response to reproductive hormones which were accompanied by decreases in gonadal levels of membrane progestin receptor alpha, the receptor regulating these processes. The finding that environmental hypoxia exposure reduces oocyte viability in addition to decreasing oocyte production in croaker suggests that fecundity estimates need to be adjusted to account for the decrease in oocyte maturation.
全球沿海地区近期缺氧（溶解氧<2毫克/升）发生率和范围的显著增加对渔业和生态系统的长期影响尚不清楚。对2010年从墨西哥湾北部广阔的沿海缺氧区域采集的大西洋鲱进行了生殖损伤调查。在整个约20000平方公里的缺氧区域采集的鲱的潜在繁殖力显著低于常氧区域的鲱。配子活力的体外生物测定表明，从缺氧区域采集的鲱对生殖激素的反应中，卵母细胞成熟和精子活力降低，同时性腺中膜孕激素受体α（调节这些过程的受体）水平下降。环境缺氧暴露除了降低鲱的卵母细胞产量外还降低其活力，这一发现表明，需要调整繁殖力估计值以考虑卵母细胞成熟的减少。
