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| Titel |
Exploring B/Ca as a pH proxy in bivalves: relationships between Mytilus californianus B/Ca and environmental data from the northeast Pacific |
| VerfasserIn |
S. J. McCoy, L. F. Robinson, C. A. Pfister, J. T. Wootton, N. Shimizu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 9 ; Nr. 8, no. 9 (2011-09-13), S.2567-2579 |
| Datensatznummer |
250006121
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| Publikation (Nr.) |
 copernicus.org/bg-8-2567-2011.pdf |
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| Zusammenfassung |
| A distinct gap in our ability to understand changes in coastal biology that
may be associated with recent ocean acidification is the paucity of directly
measured ocean environmental parameters at coastal sites in recent decades.
Thus, many researchers have turned to sclerochronological reconstructions of
water chemistry to document the historical seawater environment. In this
study, we explore the relationships between B/Ca and pH to test the
feasibility of B/Ca measured on the ion probe as a pH proxy in the California
mussel, Mytilus californianus. Heterogeneity in a range of ion
microprobe standards is assessed, leading to reproducible B/Ca ratios at the
5% level. The B/Ca data exhibit large excursions during winter months, which
are particularly pronounced during the severe winters of 2004–2005 and
2005–2006. Furthermore, B/Ca ratios are offset in different parts of the
skeleton that calcified at the same time. We compare the M.
californianus B/Ca record to directly measured environmental data during
mussel growth from the period of 1999–2009 to examine whether seawater
chemistry or temperature plays a role in controlling shell B/Ca. A suite of
growth rate models based on measured temperature are compared to the B/Ca
data to optimise the potential fit of B/Ca to pH. Despite sampling conditions
that were well-suited to testing a pH control on B/Ca, including a close
proximity to an environmental record, a distinct change in pH at the sampling
locale, and a growth model designed to optimise the correlations between
seawater pH and shell B/Ca, we do not see a strong correlations between pH
and shell B/Ca (maximum coefficient of determination, r2, of 0.207).
Instead, our data indicate a strong biological control on B/Ca as observed in
some other carbonate-forming organisms. |
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