Vidhya V, Jyothibabu R, Alok K T, Rashid C P, Arunpandi N, Devi C R Asha, Gupta G V M, Thirumurugan R
CSIR-National Institute of Oceanography, Regional Centre, Kochi, India; Bharathidasan University, Tiruchirappalli, Tamilnadu, India.
CSIR-National Institute of Oceanography, Regional Centre, Kochi, India.
Mar Pollut Bull. 2025 Feb;211:117370. doi: 10.1016/j.marpolbul.2024.117370. Epub 2024 Dec 12.
Eutrophication of marine ecosystems is a global problem, particularly in a changing climate and the spreading of Oxygen Minimum Zones (OMZs). The eastern Arabian Sea has both seasonal and permanent/perennial OMZs, but our understanding of the fauna there is extremely poor. So, this study investigated the composition and physiological status (alive or dead) of zooplankton (copepods) in the two OMZs. The study was accomplished by employing a Multiple Plankton Net and vital staining method. Our results showed for the first time that the oxygen deficiency adversely impacted the physiological status of copepods in OMZs which was reflected as (a) a two-fold decrease in zooplankton in the more intense oceanic OMZ compared to the coastal OMZ, (b) a marked increase of dead copepods in both OMZs (50 to 60 %) compared to normoxic waters (35 %) observed in previous studies and (c) higher copepod carcasses (50-70 %) and lower copepods larvae in the intense oceanic OMZ.
海洋生态系统的富营养化是一个全球性问题，尤其是在气候变化和海洋低氧区（OMZ）不断扩散的情况下。阿拉伯海东部既有季节性的，也有永久性/常年性的海洋低氧区，但我们对那里的动物群落了解极少。因此，本研究调查了两个海洋低氧区浮游动物（桡足类）的组成和生理状态（存活或死亡）。该研究通过使用复式浮游生物网和活体染色法完成。我们的结果首次表明，缺氧对海洋低氧区桡足类的生理状态产生了不利影响，具体表现为：（a）与沿海海洋低氧区相比，在更强的海洋性海洋低氧区浮游动物数量减少了两倍；（b）与之前研究中观测到的常氧水域（35%）相比，两个海洋低氧区中死亡桡足类的比例显著增加（50%至60%）；（c）在强烈的海洋性海洋低氧区，桡足类尸体比例更高（50% - 70%），而桡足类幼体数量更低。
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