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A 150-year record of phytoplankton community succession controlled by hydroclimatic variability in a tropical lake

Yamoah, Kweku Afrifa, Callac, Nolwenn, Chi Fru, Ernest ORCID:, Wohlfarth, Barbara, Wiech, Alan, Chabangborn, Akkaneewut and Smittenberg, Rienk H. 2016. A 150-year record of phytoplankton community succession controlled by hydroclimatic variability in a tropical lake. Biogeosciences 13 (13) , pp. 3971-3980. 10.5194/bg-13-3971-2016

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Climate and human-induced environmental change promote biological regime shifts between alternate stable states, with implications for ecosystem resilience, function, and services. While these effects have been shown for present-day ecosystems, the long-term response of microbial communities has not been investigated in detail. This study assessed the decadal variations in phytoplankton communities in a ca. 150 year long sedimentary archive of Lake Nong Thale Prong (NTP), southern Thailand using a combination of bulk geochemical analysis, quantitative polymerase chain reaction (qPCR) and lipid biomarkers techniques including compound-specific hydrogen isotope analysis as a proxy for precipitation. Relatively drier and by inference warmer conditions from ca. 1857 to 1916 Common Era (CE) coincided with a dominance of the green algae Botryococcus braunii, indicating lower nutrient levels in the oxic lake surface waters, possibly related to lake water stratification. A change to higher silica (Si) input around 1916 CE was linked to increased rainfall and concurs with an abrupt takeover by diatom blooms lasting for 50 years. These were increasingly outcompeted by cyanobacteria from the 1970s onwards, most likely because of increased levels of anthropogenic phosphate and a reduction in rainfall. Our results showcase that the multi-proxy approach applied here provides an efficient way to track centennial-scale limnological, geochemical and microbial change, as influenced by hydroclimatic and anthropogenic forcing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: European Geosciences Union (EGU)
ISSN: 1726-4170
Funders: ERC
Date of First Compliant Deposit: 9 November 2016
Date of Acceptance: 9 June 2016
Last Modified: 06 Nov 2023 22:42

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