A late Holocene paleo-productivity record in the western Gulf of Maine,USA, inferred from growth histories of the long-lived ocean quahog (<Emphasis Type="Italic">Arctica islandica</Emphasis>) |
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Authors: | Jr" target="_blank">Alan D WanamakerJr Karl J Kreutz Bernd R Schöne Kirk A Maasch Andrew J Pershing Harold W Borns Douglas S Introne Scott Feindel |
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Institution: | (1) Climate Change Institute and Department of Earth Sciences, University of Maine, Orono Maine, 04469-5790, USA;(2) Increments Research Group, Department of Paleontology, Institute of Geosciences, University of Mainz, Johann-Joachim-Becher-Weg 21, 55099 Mainz, Germany;(3) School of Marine Sciences, University of Maine, Orono Maine, 04469-5790, USA;(4) Darling Marine Center, University of Maine, Walpole, ME 04573, USA |
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Abstract: | To investigate environmental variability during the late Holocene in the western Gulf of Maine, USA, we collected a 142-year-old
living bivalve (Arctica islandica) in 2004, and three fossil A. islandica shells of the Medieval Warm Period (MWP) and late MWP / Little Ice Age (LIA) period (corrected 14CAMS = 1030 ± 78 ad; 1320 ± 45 ad; 1357 ± 40 ad) in 1996. We compared the growth record of the modern shell with continuous plankton recorder (CPR) time-series (1961–2003)
from the Gulf of Maine. A significant correlation (r
2 = 0.55; p < 0.0001) exists between the standardized annual growth index (SGI) of the modern shell and the relative abundance of zooplankton
species Calanus finmarchicus. We therefore propose that SGI data from A. islandica is a valid proxy for paleo-productivity of at least one major zooplankton taxa. SGIs from these shells reveal significant
periods of 2–6 years (NAO-like) based on wavelet analysis, multitaper method (MTM) analysis and singular spectrum analysis
(SSA) during the late Holocene. Based on established physical oceanographic observation in the Gulf of Maine, we suggest that
slope water variability coupled with North Atlantic Oscillation (NAO) dynamics is primarily responsible for the observed SGI
variability.
Special Issue: AGU OS06 special issue “Ocean’s role in climate change—a paleo perspective”. |
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Keywords: | Arctica islandica Shell growth Climate variability Paleo-productivity Gulf of Maine North Atlantic Oscillation (NAO) |
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