Geochemical evidence for the variation of historical seabird population on Dongdao Island of the South China Sea

From a rare freshwater lake characteristic of alkalescence, named "Cattle Pond", on the Dongdao Island of South China Sea (16 degrees 39'-16 degrees 41'N, 112 degrees 43'-112 degrees 45'E), we collected two undisturbed sediment cores that contain seabird droppings. In t...

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Bibliographic Details
Published in:Journal of Paleolimnology
Main Authors: Liu, X. D., Zhao, S. P., Sun, L. G., Luo, H. H., Yin, X. B., Xie, Z. Q., Wang, Y. H., Liu, K. X., Wu, X. H., Ding, X. F., Fu, D. P.
Other Authors: Sun, LG (reprint author), Univ Sci & Technol China, Inst Polar Environm, Hefei 230026, Anhui, Peoples R China., Univ Sci & Technol China, Inst Polar Environm, Hefei 230026, Anhui, Peoples R China., NIH, Bethesda, MD 20892 USA., Peking Univ, Sch Phys, Inst Heavy Ion Phys, Beijing 100871, Peoples R China., Peking Univ, Sch Archaeol & Museol, Beijing 100871, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: journal of paleolimnology 2006
Subjects:
Dongdao Island
Lacustrine sediments
sediment sequence affected by seabird feces
seabird population
elemental geochemistry
SST
South China Sea
PAST 2,200 YEARS
FISHERIES RESOURCES
MARINE ECOSYSTEM
AGE CALIBRATION
PENGUIN COLONY
ORGANIC-MATTER
CLIMATE-CHANGE
HEAVY-METALS
SEDIMENTS
ANTARCTICA
Antarc*
Antarctica
Online Access:https://hdl.handle.net/20.500.11897/251535
https://doi.org/10.1007/s10933-006-9006-9
Description
Summary:From a rare freshwater lake characteristic of alkalescence, named "Cattle Pond", on the Dongdao Island of South China Sea (16 degrees 39'-16 degrees 41'N, 112 degrees 43'-112 degrees 45'E), we collected two undisturbed sediment cores that contain seabird droppings. In this paper, we determined the concentration-versus-depth profiles of the geochemical elements in the ornithogenic sediment layers of the two cores, analyzed these profiles by various statistical methods, and studied their geochemical characteristics. The concentration profiles of As, Cd, Cu, Se, Zn, P and S are significantly correlated with each other and with loss on ignition (LOI) at 550 degrees C, the measure for the abundance of organic matter. Similar geochemical characteristics, however, were not observed in the upper sediment layer of the Cattle Pond notably affected by cattle excrements, as well as in the bottom sediment layer compositionally dominated by coral sand and gravel. This shows that these "bio-elements" are mainly derived from seabird feces and their geochemical composition is an important geochemical characteristic of the lacustrine ornithogenic sediments. By Q-mode factor analysis (QFA) on the concentration profiles of these bio-elements, we reconstructed the historical seabird population on Dongdao Island between 1350 and 350 year B.P., and observed significant fluctuations in the calculated population. The fluctuations seem to be related to the change of sea surface temperature (SST) in the Southern China Sea. This study provides new paleoenvironmental information of past seabird population changes in low latitude areas using an indirect geochemical method. Environmental Sciences Geosciences, Multidisciplinary Limnology SCI(E) 0 ARTICLE 3 259-279 36

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