Records of bulk organic matter and plant pigments in sediment of the ＂red-tide zone＂ adjacent to the Changjiang River estuary

Cultural eutrophication caused by nutrient over-enrichment in coastal waters will lead to a cascading set of ecosystem changes and deleterious ecological consequences, such as harmful algal blooms （HABs） and hypoxia. During the past two decades since the late 1990s, recurrent large-scale HABs （red t...

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Published in	Chinese journal of oceanology and limnology Vol. 34; no. 5; pp. 915 - 927
Main Author	亢振军于仁成孔凡洲王云峰高岩陈建华郭伟周名江
Format	Journal Article
Language	English
Published	Heidelberg Science Press 01.09.2016 Springer Nature B.V
Subjects	Accumulation Algae Algal blooms Aquatic microorganisms Bacillariophyceae beta-carotene Biology carbon Carbon 13 Carbon-nitrogen ratio Carotene Chlorophyll Chlorophylls coastal water Coastal waters Diatoms Earth and Environmental Science Earth Sciences Ecological effects ecosystems Environmental changes environmental impact Estuaries Estuarine dynamics Eutrophication Hypoxia Isotopes lead Lead isotopes Marine microorganisms Microalgae Nitrogen nitrogen content Oceanography Organic carbon Organic matter Phytoplankton Pigments Plankton blooms plant pigments Primary production primary productivity Radioisotopes radionuclides Red tide Red tides Rivers Sediment Sediments Stable isotopes Yangtze River β-Carotene Changjiang River INW, China, People's Rep., Changjiang Estuary Yangtze River sediment core hypoxia pigment Changjiang River estuary eutrophication harmful algal bloom
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ISSN	0254-4059 2096-5508 1993-5005 2523-3521
DOI	10.1007/s00343-016-4313-0

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Summary:	Cultural eutrophication caused by nutrient over-enrichment in coastal waters will lead to a cascading set of ecosystem changes and deleterious ecological consequences, such as harmful algal blooms （HABs） and hypoxia. During the past two decades since the late 1990s, recurrent large-scale HABs （red tides） and an extensive hypoxic zone have been reported in the coastal waters adjacent to the Changjiang River estuary. To retrieve the history of eutrophication and its associated ecosystem changes, a sediment core was collected from the ＂red-tide zone＂ adjacent to the Changjiang River estuary. The core was dated using the ^210pb radioisotope and examined for multiple proxies, including organic carbon （OC）, total nitrogen （TN）, stable isotopes of C and N, and plant pigments. An apparent up-core increase of OC content was observed after the 1970s, accompanied by a rapid increase of TN. The concurrent enrichment of δ^13C and increase of the C/N ratio suggested the accumulation of organic matter derived from marine primary production during this stage. The accumulation of OC after the 1970s well reflected the significant increase of primary production in the red-tide zone and probably the intensification ofhypoxia as well. Plant pigments, including chlorophyll α, β-carotene, and diatoxanthin, showed similar patterns of variation to OC throughout the core, which further confirmed the important contribution of microalgae, particularly diatoms, to the deposited organic matter. Based on the variant profiles of the pigments representative of different microalgal groups, the potential changes of the phytoplankton community since the 1970s were discussed.
Bibliography:	Cultural eutrophication caused by nutrient over-enrichment in coastal waters will lead to a cascading set of ecosystem changes and deleterious ecological consequences, such as harmful algal blooms （HABs） and hypoxia. During the past two decades since the late 1990s, recurrent large-scale HABs （red tides） and an extensive hypoxic zone have been reported in the coastal waters adjacent to the Changjiang River estuary. To retrieve the history of eutrophication and its associated ecosystem changes, a sediment core was collected from the ＂red-tide zone＂ adjacent to the Changjiang River estuary. The core was dated using the ^210pb radioisotope and examined for multiple proxies, including organic carbon （OC）, total nitrogen （TN）, stable isotopes of C and N, and plant pigments. An apparent up-core increase of OC content was observed after the 1970s, accompanied by a rapid increase of TN. The concurrent enrichment of δ^13C and increase of the C/N ratio suggested the accumulation of organic matter derived from marine primary production during this stage. The accumulation of OC after the 1970s well reflected the significant increase of primary production in the red-tide zone and probably the intensification ofhypoxia as well. Plant pigments, including chlorophyll α, β-carotene, and diatoxanthin, showed similar patterns of variation to OC throughout the core, which further confirmed the important contribution of microalgae, particularly diatoms, to the deposited organic matter. Based on the variant profiles of the pigments representative of different microalgal groups, the potential changes of the phytoplankton community since the 1970s were discussed. eutrophication; harmful algal bloom; hypoxia; pigment; sediment core; Changjiang River estuary KANG Zhenjun, YU Rencheng, KONG Fanzhou , WANG Yunfeng, GAO Yan, CHEN Jianhua, GUO Wei, ZHOU Mingjiang （1Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Seiences Qingdao 266071, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China ;3 Qinzhou University, Qinzhou 535099, China; 4 Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology Qingdao 266071, China） 37-1150/P ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0254-4059 2096-5508 1993-5005 2523-3521
DOI:	10.1007/s00343-016-4313-0