Experimental determination of salinity, temperature, growth, and metabolic effects on shell isotope chemistry ofMytilus eduliscollected from Maine and Greenland

Paleoceanography - Tập 22 Số 2 - 2007
Alan D. Wanamaker1, K. J. Kreutz1, Harold W. Borns1, D. Introne1, Scott Feindel2, Svend Funder3, Paul D. Rawson4, Bruce J. Barber5,4
1Climate Change Institute and Department of Earth Sciences, University of Maine, Orono Maine, USA
2Darling Marine Center; University of Maine; Walpole Maine USA
3Geological Museum, University of Copenhagen, Copenhagen, Denmark.
4School of Marine Sciences, University of Maine, Orono Maine, USA
5Now at Galbraith Marine Science Laboratory, Eckerd College, St. Petersburg, Florida, USA.

Tóm tắt

To study the effects of temperature, salinity, and life processes (growth rates, size, metabolic effects, and physiological/genetic effects) on newly precipitated bivalve carbonate, we quantified shell isotopic chemistry of adult and juvenile animals of the intertidal bivalveMytilus edulis(Blue mussel) collected alive from western Greenland and the central Gulf of Maine and cultured them under controlled conditions. Data for juvenile and adultM. edulisbivalves cultured in this study, and previously by Wanamaker et al. (2006), yielded statistically identical paleotemperature relationships. On the basis of these experiments we have developed a species‐specific paleotemperature equation for the bivalveM. edulis[T °C = 16.28 (±0.10) − 4.57 (±0.15) {δ18OcVPBD −δ18OwVSMOW} + 0.06 (±0.06) {δ18OcVPBD −δ18OwVSMOW}2; r2= 0.99; N = 323; p < 0.0001]. Compared to the Kim and O'Neil (1997) inorganic calcite equation,M. edulisdeposits its shell in isotope equilibrium (δ18Ocalcite) with ambient water. Carbon isotopes (δ13Ccalcite) from sampled shells were substantially more negative than predicted values, indicating an uptake of metabolic carbon into shell carbonate, andδ13Ccalcitedisequilibrium increased with increasing salinity. Sampled shells ofM. edulisshowed no significant trends inδ18Ocalcitebased on size, cultured growth rates, or geographic collection location, suggesting that vital effects do not affectδ18OcalciteinM. edulis. The broad modern and paleogeographic distribution of this bivalve, its abundance during the Holocene, and the lack of an intraspecies physiologic isotope effect demonstrated here make it an ideal nearshore paleoceanographic proxy throughout much of the North Atlantic Ocean.

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Paleoceanography

Tập 22 Số 2

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