Variation in deglacial coralgal assemblages and their paleoenvironmental significance; IODP Expedition 310, "Tahiti sea level"

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doi: 10.1016/j.gloplacha.2010.11.005
Author(s): Abbey, Elizabeth; Webster, Jody M.; Braga, Juan C.; Sugihara, Kaoru; Wallace, Carden; Iryu, Yasufumi; Potts, Donald; Done, Terry; Camoin, Gilbert; Seard, Claire
Author Affiliation(s): Primary:
James Cook University, School of Earth and Environmental Sciences, Townsville, Queensl., Australia
Other:
Universidad de Granada, Spain
National Institute for Environmental Studies, Japan
Museum of Tropical Queensland, Australia
Nagoya University, Japan
University of California, Santa Barbara, United States
Australian Institute of Marine Science, Australia
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, France
Volume Title: Global and Planetary Change
Source: Global and Planetary Change, 76(1-2), p.1-15. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0921-8181
Note: In English. 86 refs.; illus., incl. 5 tables, sketch map
Summary: 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 122m to 45m below sea-level represent reef growth from 16ka to ca. 8ka (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 565m 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 10m to greater than 20-30m 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. 12.5ka. Mainly shallow-water (<10-15m) corals and coralline algal assemblages developed continuously throughout both sites from 16ka to ca. 8ka, suggesting that coralgal assemblage variation is more influenced by factors such as turbidity and water chemistry than sea-level rise alone. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Anthozoa; Assemblages; Cenozoic; Cnidaria; Corallinaceae; Cores; Deglaciation; East Pacific; Expedition 310; French Polynesia; Integrated Ocean Drilling Program; Invertebrata; Microfossils; Oceania; Pacific Ocean; Paleoecology; Paleoenvironment; Plantae; Polynesia; Quaternary; Reef builders; Reef environment; Reefs; Rhodophyta; Sea-level changes; Society Islands; South Pacific; Southeast Pacific; Tahiti; Tahiti Sea Level Expedition
Coordinates: N174000 N174500 W1491000 W1495000
Record ID: 2011045943
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands