Seasonal assessment of the trophic status in the coastal waters adjoining Tuticorin harbor in relation to water quality and plankton community in the Gulf of Mannar, India

• Autorzy: Sathishkumar Rengasamy Subramaniyan , Sundaramanickam Arumugam , Mohanty Ajit Kumar , Sahu Gouri , Ramesh Thangavelu , Balachandar Kumar , Nithin Ajith , Surya Parthasarathy , Silambarasann Krishna
• Języki publikacji: EN

Abstrakty

EN

Seasonal variations in hydrography, trophic status, and plankton community structure were studied along the Tuticorin coastal waters (TCWs) in the Gulf of Mannar (GoM). Samples were collected in 2015 and 2016 to analyze physico-chemical (temperature, pH, salinity, suspended particulate matter (SPM), dissolved oxygen (DO), nutrients, etc.) and biological parameters (chlorophyll-a, phytoplankton, and zooplankton). The trophic index (TRIX) and eutrophication index (EI) were calculated to describe the eutrophication status of TCWs. Temperature, pH, salinity, DO, and SPM showed seasonality due to the impact of the northeast monsoon. A massive bloom of Trichodesmium erythraeum was observed, with a visible impact on water quality and the plankton community. The cluster and principal component analysis indicated the bloom event as a distinct phenomenon. ANOVA results showed significant seasonal variations rather than spatial variations. According to the trophic indices, the area had a low trophic level in 2015 and a high trophic level in 2016. The Tuticorin inshore waters had the highest TRIX and EI values during the dominance of cyanobacteria bloom in the post-monsoon 2016. The trophic indices had a positive relationship with phytoplankton abundance but showed an inverse relation with zooplankton abundance. The overall range of the TRIX index (3.18–5.96) indicated that the environment was oligotrophic to eutrophic, and EI values (0.72–21.61) indicated that the state of coastal waters was moderate to poor. This study states that periodic monsoonal flow and frequent algal bloom events have a significant impact on the GoM coastal waters.

Słowa kluczowe

EN

algal bloom; eutrophication; plankton diversity; southeast coast of India; Trichodesmium; TRIX

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2022
• Tom: No. 64 (4)
• Strony: 749--768
• Opis fizyczny: Bibliogr. 94 poz., map., rys., tab., wykr.

Twórcy

autor

Sathishkumar Rengasamy Subramaniyan

• Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu, India
• Radiological and Environment Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

autor

Sundaramanickam Arumugam

• Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu, India

• https://orcid.org/0000-0002-2682-445X

autor

Mohanty Ajit Kumar

• Radiological and Environment Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

• https://orcid.org/0000-0002-0333-0588

autor

Sahu Gouri

• Radiological and Environment Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

autor

Ramesh Thangavelu

• Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu, India

• https://orcid.org/0000-0002-7420-3754

autor

Balachandar Kumar

• Fishery Survey of India, Beach Road, Visakhapatnam, Andhra Pradesh, India

autor

Nithin Ajith

• Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu, India

autor

Surya Parthasarathy

• Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu, India

autor

Silambarasann Krishna

• Fishery Survey of India, Beach Road, Visakhapatnam, Andhra Pradesh, India

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).