TY - JOUR
T1 - A sclerochronological archive for Antarctic coastal waters based on the marine bivalve Yoldia eightsi (Jay, 1839) from the South Orkney Islands
AU - Román-González, Alejandro
AU - Scourse, James D.
AU - Richardson, Christopher A.
AU - Peck, Lloyd S.
AU - Bentley, Michael J.
AU - Butler, Paul G.
N1 - Funding Information:
We gratefully thank the diving team at BAS for their endeavour providing the specimens from Signy Island. We thank Philip A. Mele from the Lamont-Doherty Earth Observatory for providing the Weddell Polynya instrumental data collected in the region in 1982 by Arnold L. Gordon. We are also grateful to Juan Estrella Martínez and Carmen Falagán Rodríguez for their comments on the manuscript that helped to improve its quality. We also want to thank the two anonymous reviewers who improved the quality of the manuscript with their comments. This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
Funding Information:
We gratefully thank the diving team at BAS for their endeavour providing the specimens from Signy Island. We thank Philip A. Mele from the Lamont-Doherty Earth Observatory for providing the Weddell Polynya instrumental data collected in the region in 1982 by Arnold L. Gordon. We are also grateful to Juan Estrella Mart?nez and Carmen Falag?n Rodr?guez for their comments on the manuscript that helped to improve its quality. We also want to thank the two anonymous reviewers who improved the quality of the manuscript with their comments. This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
Publisher Copyright:
© 2016, © The Author(s) 2016.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - The scarcity of long instrumental series from the Southern Ocean limits our understanding of key climate and environmental feedbacks within the Antarctic system. We present an assessment for the Antarctic mollusc bivalve Yoldia eightsi as an Antarctic coastal climatological archive, based on annually-resolved growth pattern of 20 live-collected specimens in 1988 from Factory Cove, Signy Island (South Orkney Islands). Two detrending methods were applied to the growth increment series: negative exponential detrending and regional curve standardization (RCS) detrending. The RCS-chronology showed consistent synchronous growth in the population for a 20 year period (1968-1988; expressed population signal ⩾ 0.85), a negative correlation between the RCS-chronology and the fast-ice duration record (r= -0.41, N= 24, P⩽ 0.05) and winter duration (r= -0.52, N=24, P⩽ 0.01) and positive correlations with mean winter sea surface temperature (SST; r= 0.57, N= 24, P⩽ 0.01), mean summer SST (r= 0.46, N= 24, P⩽ 0.05) and mean annual SST (r= 0.48, N= 24, P⩽ 0.05). The chronology appears to record the environmental conditions generated during the Weddell Polynya event (1973 -1976) as detectable abrupt changes in the annual growth patterns. Over eight years (1973-1980) a negative relationship between shell growth and suspended chlorophyll (i.e. a proxy for surface productivity) is apparent which is likely influenced by the seasonal deposition of organic phytodetritus on the seabed following surface water phytoplankton blooms. Our results form a basis for establishing Y. eightsi as an environmental archive for coastal Antarctic waters.
AB - The scarcity of long instrumental series from the Southern Ocean limits our understanding of key climate and environmental feedbacks within the Antarctic system. We present an assessment for the Antarctic mollusc bivalve Yoldia eightsi as an Antarctic coastal climatological archive, based on annually-resolved growth pattern of 20 live-collected specimens in 1988 from Factory Cove, Signy Island (South Orkney Islands). Two detrending methods were applied to the growth increment series: negative exponential detrending and regional curve standardization (RCS) detrending. The RCS-chronology showed consistent synchronous growth in the population for a 20 year period (1968-1988; expressed population signal ⩾ 0.85), a negative correlation between the RCS-chronology and the fast-ice duration record (r= -0.41, N= 24, P⩽ 0.05) and winter duration (r= -0.52, N=24, P⩽ 0.01) and positive correlations with mean winter sea surface temperature (SST; r= 0.57, N= 24, P⩽ 0.01), mean summer SST (r= 0.46, N= 24, P⩽ 0.05) and mean annual SST (r= 0.48, N= 24, P⩽ 0.05). The chronology appears to record the environmental conditions generated during the Weddell Polynya event (1973 -1976) as detectable abrupt changes in the annual growth patterns. Over eight years (1973-1980) a negative relationship between shell growth and suspended chlorophyll (i.e. a proxy for surface productivity) is apparent which is likely influenced by the seasonal deposition of organic phytodetritus on the seabed following surface water phytoplankton blooms. Our results form a basis for establishing Y. eightsi as an environmental archive for coastal Antarctic waters.
KW - Antarctica
KW - marine proxy
KW - sclerochronology
KW - Signy Island
KW - Weddell Polynya
KW - Yoldia eightsi
UR - http://www.scopus.com/inward/record.url?scp=85011878928&partnerID=8YFLogxK
U2 - 10.1177/0959683616658525
DO - 10.1177/0959683616658525
M3 - Article
AN - SCOPUS:85011878928
SN - 0959-6836
VL - 27
SP - 271
EP - 281
JO - Holocene
JF - Holocene
IS - 2
ER -
