Abstract
Biomarkers have been widely used to reconstruct phytoplankton productivity and community structure changes, and this method has been applied for the first time in the middle Okinawa Trough during the transition from the last deglaciation to the Holocene. The total content of all marine phytoplankton biomarkers, used as a total productivity indicator, reveals higher productivity during the deglaciation. The ratios of the biomarkers are used as community structure indicators which show that, compared with the Holocene, the contribution from haptophytes decreased while the contributions from diatoms and dinoflagellates increased during the deglaciation. The increased productivity during the deglaciation was likely caused by the stronger winter monsoon. Also increased nutrient supply from terrestrial sources contributes to the higher productivity due to lower sea-level, which is consistent with higher terrestrial biomarker (long-chain n-alkanols) content. These changes in the nutrient supply also contributed to the community structure changes in the Okinawa Trough.
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Supported by the National Natural Science Foundation of China (Grant Nos. 40676032, 40706021, 40621063 and 40431002)
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Xing, L., Zhao, M., Zhang, H. et al. Biomarker reconstruction of phytoplankton productivity and community structure changes in the middle Okinawa Trough during the last 15 ka. Chin. Sci. Bull. 53, 2552–2559 (2008). https://doi.org/10.1007/s11434-008-0231-7
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DOI: https://doi.org/10.1007/s11434-008-0231-7