Some considerations on calcium homeostasis in semi-terrestrial crabs

F. P. Zanotto, F. Pinheiro, L. A. Brito, M. G. Wheatly

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Calcium (Ca), deposited as CaCO3 after molting events take place, indicates that Ca levels in semi-terrestrial crabs should be regulated at the dietary level as well as through whole animal net Ca flux. Two semi-terrestrial crabs found in salt marsh environments (Sesarma rectum and Chasmagnathus granulata) were fed purified diets with variable Ca concentrations (0%, 2.22% and 6.66% Ca). Both animals displayed similar feeding strategies through consumption of higher amounts of the diet containing more Ca (6.66% Ca). Sesarma, a predominantly herbivore crab, ate more quantities of all the diets offered when compared to Chasmagnathus, a more carnivorous crab. Whole animal net fluxes of Ca over 5 days in Sesarma show that fluxes vary from 2.5 to 1.5 mmol kg-1 h-1, similar to values found earlier for a crayfish, Procambarus clarkii. However, the fluxes over 5 days did not decrease significantly compared to fluxes for the first day postmolt. Overall, semi-terrestrial crabs seem to maximize Ca influx through the gills and through dietary intake, a mineral that is known to have great importance for biomineralization in crustaceans.

Original languageEnglish (US)
Pages (from-to)89-95
Number of pages7
JournalInternational Congress Series
Volume1275
DOIs
StatePublished - Dec 1 2004
Externally publishedYes

Keywords

  • Calcium balance
  • Calcium net flux
  • Dietary calcium
  • Semi-terrestrial crabs

ASJC Scopus subject areas

  • Medicine(all)

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