A 150-year record of phytoplankton community succession controlled by hydroclimatic variability in a tropical lake
| Autor: | Nolwenn Callac, Alan Wiech, Barbara Wohlfarth, Kweku A. Yamoah, Rienk H. Smittenberg, Ernest Chi Fru, Akkaneewut Chabangborn |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
010504 meteorology & atmospheric sciences Environmental change 030106 microbiology lcsh:Life Ecological succession 01 natural sciences 03 medical and health sciences Alternative stable state lcsh:QH540-549.5 Phytoplankton Dominance (ecology) Ecosystem 14. Life underwater Precipitation Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes biology Ecology lcsh:QE1-996.5 biology.organism_classification lcsh:Geology lcsh:QH501-531 Diatom 13. Climate action Environmental science lcsh:Ecology |
| Zdroj: | Biogeosciences, Vol 13, Iss 13, Pp 3971-3980 (2016) |
| ISSN: | 1726-4189 1726-4170 |
| DOI: | 10.5194/bg-13-3971-2016 |
| Popis: | Climate and human-induced environmental change promotes biological regime shifts between alternate stable states, with implications for ecosystem resilience, function and services. While this has been shown for recent microbial communities, the long-term response of microbial communities has not been investigated in detail. This study investigated the decadal variations in phytoplankton communities in a ~150 year long sedimentary archive of Lake Nong Thale Prong (NTP), southern Thailand using a combi nation of DNA and lipid biomarkers techniques. Reconstructed drier climate from ~1857-1916 Common Era (CE) coincided with oligotrophic lake water conditions and dominance of the green algae Botryococcus braunii, producing characteristic botryococcene lipids. A change to higher silica (Si) input ~1916 CE, which was related to increased rainfall concurs with an abrupt takeover by diatom blooms lasting for 50 years. Since the 1970s more eutrophic conditions prevailed, which was likely caused by increased levels of anthropogenic phosphate (P), aided by increased lake stratification caused by somewhat dryer conditions. The eutrophic conditions led to increased primary productivity consisting again of a Botryococcus sp., though this time not producing the botryococcene lipids. Moreover, Cyanobacteria became dominant. Our results indicate that a combined DNA and lipid biomarker approach provides an efficient way to allow tracking centennial-scale hydroclimate and anthropogenic feedback processes in lake ecosystems. |
| Databáze: | OpenAIRE |
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