TY - JOUR
T1 - Variation in deglacial coralgal assemblages and their paleoenvironmental significance
T2 - IODP Expedition 310, "Tahiti Sea Level"
AU - Abbey, Elizabeth
AU - Webster, Jody M.
AU - Braga, Juan C.
AU - Sugihara, Kaoru
AU - Wallace, Carden
AU - Iryu, Yasufumi
AU - Potts, Donald
AU - Done, Terry
AU - Camoin, Gilbert
AU - Seard, Claire
N1 - Funding Information:
This research used samples and data provided by the Integrated Ocean Drilling Program (IODP). We wish to acknowledge the Expedition 310 Scientists, as well as Bremen Core Repository members for support and collaboration during offshore/onshore parties. We would like to thank the support of ANSTO, including Geraldine Jacobsen and technicians for assistance with AMS, and Gordon Thorogood for support with XRD analyses. Funding was provided to E.A. by the School of Earth and Environmental Sciences at James Cook University , the School of Geosciences at the University of Sydney , the Australian Institute of Marine Science in a partnership with James Cook University (AIMS@JCU) , the Australian Institute for Nuclear Science and Engineering (AINSE) and the Australian Nuclear Science and Technology Organisation (ANSTO) . J.M.W. was provided support from James Cook University as part of a New Staff Development Grant and by the University of Sydney. Financial support was issued to Y.I. in part by grants-in-aid for scientific research, Japan Society for the Promotion of Science ( 18340163 ). We would also like to thank Lucien Montaggioni for his helpful review.
PY - 2011/3
Y1 - 2011/3
N2 - Fossil reefs are valuable recorders of paleoenvironmental changes during the last deglaciation, and detailed characterizations of coralgal assemblages can improve understanding of the behavior and impacts of sea-level rise. Drilling in 2005 by the Integrated Ocean Drilling Program (IODP) Expedition 310 explored submerged offshore reefs from three locations around Tahiti, French Polynesia and provides the first look at island-wide variability of coralgal assemblages during deglacial sea-level rise. We present the first detailed examination of coral and coralline algal taxonomy and morphology from two sites on Tahiti (offshore Tiarei and offshore Maraa). Sixteen cores ranging in depth from 122. m to 45. m below sea-level represent reef growth from 16. ka to ca. 8. ka (Camoin, G.F., Iryu, Y., McInroy, D.B. and the IODP Expedition 310 Scientists, 2007. IODP Expedition 310 reconstructs sea level, climatic, and environmental changes in the South Pacific during the last deglaciation. Scientific Drilling, 5: 4-12). Twenty-six coral species, twelve coral genera and twenty-eight coralline algal species were identified from 565. m of core and over 400 thin sections. Based on these data, and in comparison with modern and fossil analogs, seven coral and four algal assemblages have been identified in the deglacial sequences in Tahiti, representing a range of environments from less than 10. m to greater than 20-30. m water depth. Deglacial reef initiation varied at sites based on the available substrate, and early colonizers suggest water conditions at all sites were unfavorable to sensitive corals, such as Acropora, prior to ca. 12.5. ka. Mainly shallow-water (<10-15 m) corals and coralline algal assemblages developed continuously throughout both sites from 16. ka to ca. 8. ka, suggesting that coralgal assemblage variation is more influenced by factors such as turbidity and water chemistry than sea-level rise alone.
AB - Fossil reefs are valuable recorders of paleoenvironmental changes during the last deglaciation, and detailed characterizations of coralgal assemblages can improve understanding of the behavior and impacts of sea-level rise. Drilling in 2005 by the Integrated Ocean Drilling Program (IODP) Expedition 310 explored submerged offshore reefs from three locations around Tahiti, French Polynesia and provides the first look at island-wide variability of coralgal assemblages during deglacial sea-level rise. We present the first detailed examination of coral and coralline algal taxonomy and morphology from two sites on Tahiti (offshore Tiarei and offshore Maraa). Sixteen cores ranging in depth from 122. m to 45. m below sea-level represent reef growth from 16. ka to ca. 8. ka (Camoin, G.F., Iryu, Y., McInroy, D.B. and the IODP Expedition 310 Scientists, 2007. IODP Expedition 310 reconstructs sea level, climatic, and environmental changes in the South Pacific during the last deglaciation. Scientific Drilling, 5: 4-12). Twenty-six coral species, twelve coral genera and twenty-eight coralline algal species were identified from 565. m of core and over 400 thin sections. Based on these data, and in comparison with modern and fossil analogs, seven coral and four algal assemblages have been identified in the deglacial sequences in Tahiti, representing a range of environments from less than 10. m to greater than 20-30. m water depth. Deglacial reef initiation varied at sites based on the available substrate, and early colonizers suggest water conditions at all sites were unfavorable to sensitive corals, such as Acropora, prior to ca. 12.5. ka. Mainly shallow-water (<10-15 m) corals and coralline algal assemblages developed continuously throughout both sites from 16. ka to ca. 8. ka, suggesting that coralgal assemblage variation is more influenced by factors such as turbidity and water chemistry than sea-level rise alone.
KW - Coralgal assemblages
KW - IODP Expedition 310 "Tahiti Sea Level"
KW - Last deglaciation
KW - Paleoenvironmental change
KW - Tahiti
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U2 - 10.1016/j.gloplacha.2010.11.005
DO - 10.1016/j.gloplacha.2010.11.005
M3 - Article
AN - SCOPUS:79952314734
SN - 0921-8181
VL - 76
SP - 1
EP - 15
JO - Global and Planetary Change
JF - Global and Planetary Change
IS - 1-2
ER -