CA regulation in the freshwater bivalve Anodonta imbecilis: I. Effect of environmental CA concentration and body mass on unidirectional and net CA fluxes

Dazhong Xu, Michele G. Wheatly

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The present paper reports unidirectional and net Ca fluxes of a freshwater bivalve, Anodonta imbecilis, as a function of external Ca concentration and body mass. Larger animals were better able to maintain Ca balance than smaller animals, which experienced net loss of Ca. External Ca concentration had no significant effect on net Ca flux. Unidirectional Ca influx decreased with body mass and increased with external Ca concentration. The relationship between external Ca concentration and unidirectional Ca influx follows the Michaelis-Menten equation. The estimated half saturation Ca concentration for unidirectional Ca influx and the maximum unidirectional influx were 0.213 mM and 4.329 μmol g dry mass-1h-1, respectively. External Ca concentration did not affect unidirectional Ca efflux of the animals. Unidirectional Ca efflux decreased with body mass.

Original languageEnglish (US)
Pages (from-to)59-65
Number of pages7
JournalMalacologia
Volume38
Issue number1-2
StatePublished - Dec 1 1996
Externally publishedYes

Keywords

  • Bivalve
  • Body mass
  • Calcium concentration
  • Calcium flux

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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