Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary

Sedimentary organic matter (OM) composition serves as a biomarker and helps in hindcast analysis of the events in the habitat. The present study was carried out on a monthly basis to evaluate the contribution of different biological communities to the surface sediment in a monsoon-influenced tropica...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Laxman Gardade, Lidita Khandeparker, Dattesh V. Desai, P. Atchuthan, Arga Chandrashekar Anil
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Estuary Surface sediment Organic matter Fatty acid biomarkers Monsoon Bacteria Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d4bd5e9136ca437caf6265f7f5494933
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d4bd5e9136ca437caf6265f7f5494933
record_format	dspace
spelling	oai:doaj.org-article:d4bd5e9136ca437caf6265f7f54949332021-12-01T04:57:58ZFatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary1470-160X10.1016/j.ecolind.2021.108014https://doaj.org/article/d4bd5e9136ca437caf6265f7f54949332021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21006798https://doaj.org/toc/1470-160XSedimentary organic matter (OM) composition serves as a biomarker and helps in hindcast analysis of the events in the habitat. The present study was carried out on a monthly basis to evaluate the contribution of different biological communities to the surface sediment in a monsoon-influenced tropical Zuari estuary, west coast of India, using source-specific fatty acid (FA) biomarkers and total organic carbon to nitrogen ratio (TOC/TN). Our observations revealed spatio-temporal variation in the OM composition in this estuary, which is influenced by in situ production, bacterial re-working, riverine inputs, and hydrodynamics. The content of TOC, TN, and total FAs in the sediment ranged from 0.13 to 4.27%, 0.01 to 0.31%, and 29 to 122 µg g−1 sediment dry weight, respectively. High content of TOC, TN, total FAs, terrestrial plants-specific FAs, and detrital derived FAs at the lower mid-estuarine (inner) stations when compared to the mouth of the estuary, points out lower mid-estuarine region as the major depositional site for the OM. Low amount of OM at the mouth of the estuary is attributed to high bacterial contribution, which seems to be maintained by repetitive cycles of resuspension-deposition of organic materials. Thus, it seems that the estuarine morphology influences the deposition of OM and plays an important role in the functioning of the estuarine ecosystem. The contribution of phytoplankton-specific FAs was high at the banks of the estuary, which form a suitable habitat for benthic organisms including artisanal fisheries. Diatom, dinoflagellate, and zooplankton-specific FAs were high during the post-monsoon season and decreased from the pre-monsoon to monsoon season. Terrestrial plants and bacteria-derived FAs were high during the monsoon suggesting the role of bacteria in the assimilation of terrestrial material. Elucidating the degradation pattern of in situ produced and terrestrial-derived organic matter through the laboratory designed microcosm experiments is a way forward.Laxman GardadeLidita KhandeparkerDattesh V. DesaiP. AtchuthanArga Chandrashekar AnilElsevierarticleEstuarySurface sedimentOrganic matterFatty acid biomarkersMonsoonBacteriaEcologyQH540-549.5ENEcological Indicators, Vol 130, Iss , Pp 108014- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Estuary Surface sediment Organic matter Fatty acid biomarkers Monsoon Bacteria Ecology QH540-549.5
spellingShingle	Estuary Surface sediment Organic matter Fatty acid biomarkers Monsoon Bacteria Ecology QH540-549.5 Laxman Gardade Lidita Khandeparker Dattesh V. Desai P. Atchuthan Arga Chandrashekar Anil Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
description	Sedimentary organic matter (OM) composition serves as a biomarker and helps in hindcast analysis of the events in the habitat. The present study was carried out on a monthly basis to evaluate the contribution of different biological communities to the surface sediment in a monsoon-influenced tropical Zuari estuary, west coast of India, using source-specific fatty acid (FA) biomarkers and total organic carbon to nitrogen ratio (TOC/TN). Our observations revealed spatio-temporal variation in the OM composition in this estuary, which is influenced by in situ production, bacterial re-working, riverine inputs, and hydrodynamics. The content of TOC, TN, and total FAs in the sediment ranged from 0.13 to 4.27%, 0.01 to 0.31%, and 29 to 122 µg g−1 sediment dry weight, respectively. High content of TOC, TN, total FAs, terrestrial plants-specific FAs, and detrital derived FAs at the lower mid-estuarine (inner) stations when compared to the mouth of the estuary, points out lower mid-estuarine region as the major depositional site for the OM. Low amount of OM at the mouth of the estuary is attributed to high bacterial contribution, which seems to be maintained by repetitive cycles of resuspension-deposition of organic materials. Thus, it seems that the estuarine morphology influences the deposition of OM and plays an important role in the functioning of the estuarine ecosystem. The contribution of phytoplankton-specific FAs was high at the banks of the estuary, which form a suitable habitat for benthic organisms including artisanal fisheries. Diatom, dinoflagellate, and zooplankton-specific FAs were high during the post-monsoon season and decreased from the pre-monsoon to monsoon season. Terrestrial plants and bacteria-derived FAs were high during the monsoon suggesting the role of bacteria in the assimilation of terrestrial material. Elucidating the degradation pattern of in situ produced and terrestrial-derived organic matter through the laboratory designed microcosm experiments is a way forward.
format	article
author	Laxman Gardade Lidita Khandeparker Dattesh V. Desai P. Atchuthan Arga Chandrashekar Anil
author_facet	Laxman Gardade Lidita Khandeparker Dattesh V. Desai P. Atchuthan Arga Chandrashekar Anil
author_sort	Laxman Gardade
title	Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
title_short	Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
title_full	Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
title_fullStr	Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
title_full_unstemmed	Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
title_sort	fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d4bd5e9136ca437caf6265f7f5494933
work_keys_str_mv	AT laxmangardade fattyacidsasindicatorsofsedimentorganicmatterdynamicsinamonsooninfluencedtropicalestuary AT liditakhandeparker fattyacidsasindicatorsofsedimentorganicmatterdynamicsinamonsooninfluencedtropicalestuary AT datteshvdesai fattyacidsasindicatorsofsedimentorganicmatterdynamicsinamonsooninfluencedtropicalestuary AT patchuthan fattyacidsasindicatorsofsedimentorganicmatterdynamicsinamonsooninfluencedtropicalestuary AT argachandrashekaranil fattyacidsasindicatorsofsedimentorganicmatterdynamicsinamonsooninfluencedtropicalestuary
_version_	1718405692994355200

Fatty acids as indicators of sediment organic matter dynamics in a monsoon-influenced tropical estuary

Ejemplares similares