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Experimental growth pattern calibration of Antarctic scallop shells (Adamussium colbecki, Smith 1902) to provide a biogenic archive of high-resolution records of environmental and climatic changes

Lartaud, Franck; Chauvaud, Laurent; Richard, Joëlle; Toulot, Aurore; Bollinger, Claire; Testut, Laurent; Paulet, Yves-Marie. 2010 Experimental growth pattern calibration of Antarctic scallop shells (Adamussium colbecki, Smith 1902) to provide a biogenic archive of high-resolution records of environmental and climatic changes. Journal of Experimental Marine Biology and Ecology, 393 (1-2). 158-167. 10.1016/j.jembe.2010.07.016

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Abstract/Summary

To determine the potential of Antarctic bivalve shells as biomonitors for environmental and climatic variations in polar marine areas, we developed a growth model for juvenile Adamussium colbecki Smith, 1902 based on the use of in situ temporal calcein markings to calibrate growth patterns in the external striae formation. To minimize scallop stress caused by excessive handling, in situ benthic chambers were used for the marking experiment, during an exposure time of 6 h. Once marked, scallops remained on site in a benthic cage and were collected 18, 26, and 41 days later. Apart from a few specimens affected by possible calcein toxicity effects, the detectable mark in all shells revealed a higher austral summer growth rate for A. colbecki compared to other Antarctic bivalves. Using calcein labeling, we identified a near 14-day periodicity in the striae formation associated with the fortnightly seawater level regime. Striae counting and increment width measurements showed an annual cycle, with no clear cessation of growth in juvenile specimens, allowing age determination. Because of the relatively high growth rate for a polar species and easily recognizable sclerochronological calendar in the shell striae formation, A. colbecki is an appropriate species for high-resolution (infra-monthly) geochemical sampling. Comparison between LA-ICP-MS analyses (Li, B, Mg, Mn, Co, Sr, Ba, Pb) from one shell and hydrological parameters (sea level, temperature, salinity) measured in seawater suggests, however, that more work is needed to calibrate the trace element proxies. Nevertheless, the shell of the Antarctic scallop A. colbecki has tremendous potential for recording environmental conditions from time periods covering months to a few years in polar waters, notably the ice melting date.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.jembe.2010.07.016
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 0022-0981
Additional Keywords: Adamussium colbecki, Antarctic scallop, Calcein marking, Growth pattern, LA-ICP-MS
NORA Subject Terms: Marine Sciences
Meteorology and Climatology
Biology and Microbiology
Ecology and Environment
Date made live: 17 Mar 2011 16:29
URI: http://nora.nerc.ac.uk/id/eprint/11782

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