Biomarker records in penguin droppings and observed changes in penguin communities and their response to the ENSO in the Western Antarctic  

作　　者：ZHANG HaiSheng LU DouDing YU PeiSong ZHANG WeiGuo LU Bing Hans-Ulrich PETER Walter VETTER 

机构地区：[1]Laboratory of Marine Ecosystem and Biogeochemistry,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China [2]State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 201100,China [3]Institute of Ecology,Friedrich Schiller University,Jena D-07743,Germany

出　　处：《Science China Earth Sciences》2012年第8期1238-1247,共10页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of Chi-na (Grant Nos.40876104 and 41006118)

摘　　要：Lipid biomarkers in AD2 penguin droppings-amend soil core from the Ardley Island,Western Antarctic,were dated using 210Pb.Changes in the fatty acid ratios of nC18:2/nC18:0 from the penguin droppings reflect climate changes coincident with ENNO events during 1931-2006.The occurrence of the minimum values in the depth of 2-3 and 6-7 cm are consistent with the end of ENSO in 1958 and 1983,respectively,reflecting a lag of the biomarker records in AD2 penguin droppings-amend soil in climatic signatures.This study also reveals that the changes in the relative concentration of n-alkanes nC23,the ratios of nC23/nC17 and nC21 /nC22+,and carbon preferential index(CPI) values collectively indicate the variations of soil microor-ganism and lower plant,which are closely related to climate changes.The ratios of bacterial fatty acids iC15:0/aC15:0 reflect the increasing significance of microorganism activities during the two periods that occurred at the end years of ENSO.Decrease in CPIA value and increase in nC21 /nC22+ indicate that low molecular weight fatty acids are derived from microorganism;and their insignificant correlation with Pr/Ph suggests microorganisms play an important role in the relatively simply ecosystem in the Antarctic and are closely linked to climatic conditions.In addition,the observed penguin community indicates the popula-tion of penguin can largely reflect the impacts of global climate changes on the ecosystem.Lipid biomarkers in AD2 penguin droppings-amend soil core from the Ardley Island, Western Antarctic, were dated using ^210Pb. Changes in the fatty acid ratios of nC18： 2/nC18：0 from the penguin droppings reflect climate changes coincident with ENNO events during 1931-2006. The occurrence of the minimum values in the depth of 2-3 and 6-7 cm are consistent with the end of ENSO in 1958 and 1983, respectively, reflecting a lag of the biomarker records in AD2 penguin droppings-amend soil in climatic signatures. This study also reveals that the changes in the relative concentration of n-alkanes nC23, the ratios of nC23/nC17 and ∑nC21-/∑nC22^＋, and carbon preferential index （CPI） values collectively indicate the variations of soil microor- ganism and lower plant, which are closely related to climate changes. The ratios of bacterial fatty acids iC15：0/aC15：0 reflect the increasing significance of microorganism.activities during the two periods that occurred at the end years of ENSO. Decrease in CPIA value and increase in ∑nC21^-/∑nC22^＋ indicate that low molecular weight fatty acids are derived from microorganism; and their insignificant correlation with Pr/Ph suggests microorganisms play an important role in the relatively simply ecosystem in the Antarctic and are closely linked to climatic conditions. In addition, the observed penguin community indicates the popula- tion of penguin can largely reflect the impacts of global climate changes on the ecosystem.

关 键 词：Western Antarctic penguin droppings ^210PB BIOMARKER penguin population climate change 

分 类 号：P618.130.1[天文地球—矿床学] P732[天文地球—地质学]