Seasonal variation of trace element and isotopic composition in the shell of a coastal mollusk, Mactra isabelleana

M. J. Leng, N. J. G. Pearce

Research output: Contribution to journalArticlepeer-review

13 Citations (SciVal)

Abstract

Shells of the bivalve Mactra isabelleana taken from marine and estuarine environments along the coast of Argentina, show a cyclicity in carbon and oxygen isotope ratios from analysis of incrementally grown shell carbonate that reflect seasonal changes in temperature and salinity in the coastal waters. Trends in trace element data, from the same sample intervals, can be compared to variations in the isotope data. In the estuarine shell, there are cyclic variations in strontium, magnesium, and barium (Sr, Mg, and Ba) that match closely the variation in δ 18O and δ 13C. The highest concentration of these elements are coincident with δ 18O peaks and approach mean values for both isotopes and trace elements from the marine shell. However, there is a lack of statistically significant correlations between the trace element and isotope data, which suggests that the patterns of trace element variations cannot be only related to environmental parameters, although predominantly controlled by them. There is no correlation between isotopes and trace elements in the marine shell, which suggests physiological effects, rather than environmental, control the incorporation of the trace elements into the shell carbonate.

Original languageEnglish
Pages (from-to)569-574
Number of pages6
JournalJournal of Shellfish Research
Volume18
Issue number2
Publication statusPublished - Dec 1999

Keywords

  • Mactra
  • trace elements
  • stable isotopes
  • Argentina
  • BUENOS-AIRES PROVINCE
  • MARINE DEPOSITS
  • CALCITE
  • ARGENTINA
  • OXYGEN
  • CARBON
  • ARAGONITE
  • HOLOCENE
  • SEAWATER
  • CLAM
  • Stable isotopes
  • Trace elements

Fingerprint

Dive into the research topics of 'Seasonal variation of trace element and isotopic composition in the shell of a coastal mollusk, Mactra isabelleana'. Together they form a unique fingerprint.

Cite this