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- Title
Environmental controls on the boron and strontium isotopic composition of aragonite shell material of cultured Arctica islandica.
- Authors
Liu, Y.-W.; Aciego, S. M.; Wanamaker Jr., A. D.
- Abstract
Ocean acidification, the decrease in ocean pH associated with increasing atmospheric CO2, is likely to impact marine organisms, particularly those that produce carbonate skeletons or shells. Therefore it is important to investigate how environmental factors (seawater pH, temperature and salinity) influence the chemical compositions in biogenic carbonates. In this study we report the first high-resolution strontium (87Sr / 86Sr and δ88 = 86Sr) and boron (δ11B) isotopic values in the aragonite shell of cultured Arctica islandica (A. islandica). The 87Sr/86Sr ratios from both tank water and shell samples show ratios nearly identical to the open ocean, which suggests that the shell material reflects ambient ocean chemistry without terrestrial influence. The 84Sr-87Sr double spike resolved shell δ88 / 86Sr and Sr concentration data show no resolvable change throughout the culture period and reflect no theoretical kinetic mass fractionation throughout the experiment despite a temperature change of more than 15 °C. The δ11B records from the experiment show at least a 5‰ increase through the culture season (January 2010-August 2010), with low values from beginning to week 19 and higher values hereafter. The larger range in δ11B in this experiment compared to predictions based on other carbonate organisms (2-3 ‰) suggests that a speciesspecific fractionation factor may be required. A relatively strong correlation between the ΔpH (pHshell - pHsw) and seawater pH (pHsw) was observed (R² = 0.34), which suggests that A. islandica partly regulates the pH of the extrapallial fluid. However, this proposed mechanism only explains approximately 34% of the variance in the δ11B data. Instead, a rapid rise in δ11B after week 19 suggests that the boron uptake of the shell changes when a temperature threshold of 13 °C is reached.
- Subjects
ENVIRONMENTAL engineering; BORON isotopes; STRONTIUM isotopes; ARAGONITE; BIVALVE shells; OCEAN quahog; BIVALVE culture
- Publication
Biogeosciences Discussions, 2015, Vol 12, Issue 3, p2979
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-12-2979-2015