阿拉伯海东部浮游植物组成与碳同位素的时空动态

IF 4.9 3区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Marine pollution bulletin Pub Date : 2024-12-26 DOI:10.1016/j.marpolbul.2024.117474

Prachi Marathe , Anil Kumar Vijayan , B. Bikram Reddy , V. Sudheesh

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引用次数: 0

摘要

利用颗粒有机碳稳定同位素比值（δ13CPOC）研究了阿拉伯海东部6个海岸-近海样带3个季节颗粒物有机质（POM）的主要贡献源及其与浮游植物组成的关系。结果表明，冬季和夏季风期间，沿海海域δ13CPOC升高（- 22.40±1.76‰），与浮游植物生物量增加（2.26±2.21 μg l−1）和硅藻（微型浮游植物）优势（65.35±30.98%）有关。春季风间期δ13CPOC偏低（- 23.31±1.32‰），与蓝藻（微浮游植物）优势（78.27±22.75%）相关。POC与叶绿素a （Chla）和颗粒氮（PN）呈正相关(r >；0.5, p <；0.05)，以及它们的比值(POC:Chla <；200和POC:PN <；12)，表明POM的原生性。根据浮游植物组成确定了不同的δ13CPOC范围；硅藻（微型浮游植物）为主的水体δ13CPOC值在−23.83 ~−19.19‰之间，纳米和/或微型浮游植物为主的水体δ13CPOC值在−26.00 ~−22.15‰之间。本研究强调了POM组成的时空变异性，并强调了δ13CPOC在理解其与浮游植物组成关系中的重要性。δ13CPOC的基线信息将有助于建立东亚地区稳定的同位素等值线图，增强我们对滋养动力学和动物迁徙模式的理解。

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Spatiotemporal dynamics of carbon isotope ratios and phytoplankton composition in the eastern Arabian Sea

This study investigated major contributors of the particulate organic matter (POM) using stable isotope ratios of particulate organic carbon (δ¹³C_POC) and its relationship with phytoplankton composition during three seasons across six coast-offshore transects in the eastern Arabian Sea (EAS). Results revealed significant spatiotemporal variations, with elevated δ¹³C_POC in coastal waters during the winter and summer monsoon (−22.40 ± 1.76‰), linked to increased phytoplankton biomass (2.26 ± 2.21 μg l⁻¹) and dominance of diatoms (micro-phytoplankton) (65.35 ± 30.98%). In contrast, lower δ¹³C_POC during the spring inter monsoon (SIM) and in offshore waters during WM and SM (−23.31 ± 1.32‰) were associated with cyanobacteria (pico-phytoplankton) dominance (78.27 ± 22.75%). Positive correlations of POC with Chlorophyll a (Chla) and particulate nitrogen (PN) (r > 0.5, p < 0.05), along with their ratios (POC:Chla < 200 and POC:PN < 12), indicated the autochthonous nature of POM. Distinct δ¹³C_POC ranges were identified based on phytoplankton composition; diatoms (micro-phytoplankton) dominated waters exhibited δ¹³C_POC values between −23.83 and −19.19‰, while nano and/or pico-phytoplankton dominated showed values ranging from −26.00 to −22.15‰. This study highlights spatiotemporal variability in the POM composition and emphasises the importance of δ¹³C_POC in understanding its relationship with phytoplankton composition. Baseline information on δ¹³C_POC will aid in developing stable isotope isoscapes of the EAS, enhancing our understanding of trophodynamics and animal migratory patterns.

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来源期刊

Marine pollution bulletin 环境科学-海洋与淡水生物学

CiteScore

10.20

自引率

15.50%

发文量

1077

审稿时长

68 days

期刊介绍： Marine Pollution Bulletin is concerned with the rational use of maritime and marine resources in estuaries, the seas and oceans, as well as with documenting marine pollution and introducing new forms of measurement and analysis. A wide range of topics are discussed as news, comment, reviews and research reports, not only on effluent disposal and pollution control, but also on the management, economic aspects and protection of the marine environment in general.