QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

First published online January 12, 2004
Journal of Experimental Biology 207, 645-653 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00765

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Guerreiro, P. M. Articles by Canario, A. V. M. Search for Related Content PubMed PubMed Citation Articles by Guerreiro, P. M. Articles by Canario, A. V. M.

Water calcium concentration modifies whole-body calcium uptake in sea bream larvae during short-term adaptation to altered salinities

Pedro M. Guerreiro^1,2, Juan Fuentes¹, Gert Flik², Josep Rotllant¹, Deborah M. Power¹ and Adelino V. M. Canario^1,*

¹ Centre of Marine Sciences (CCMAR), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
² Department of Animal Physiology, University of Nijmegen, 6525 ED Nijmegen, The Netherlands

^* Author for correspondence (e-mail: acanario{at}ualg.pt)

Accepted 22 October 2003

Whole-body calcium uptake was studied in gilthead sea bream larvae (9–83 mg) in response to changing environmental salinity and [Ca²⁺]. Calcium uptake increased with increased fish size and salinity. Fish exposed to calcium-enriched, diluted seawater showed increased calcium uptake compared with fish in diluted seawater alone. Calcium uptake was unchanged in Na⁺-enriched, diluted seawater. Overall, [Ca²⁺], and not salinity/osmolarity per se, appears to be the main factor contributing to calcium uptake. By contrast, drinking was reduced by a decrease in salinity/osmolarity but was little affected by external [Ca²⁺]. Calculations of the maximum contribution from drinking-associated calcium uptake showed that it became almost insignificant (less than 10%) through a strong decrease in drinking rate at low salinities (0–8). Diluted seawater enriched in calcium to the concentration present in full-strength seawater (i.e. constant calcium, decreasing salinity) restored intestinal calcium uptake to normal. Extra-intestinal calcium uptake also benefited from calcium addition but to a lesser extent.

Key words: calcium uptake, drinking rate, salinity, environmental calcium, larvae, gilthead sea bream, Sparus auratus

This article has been cited by other articles:

				W Abbink, X M Hang, P M Guerreiro, F A T Spanings, H A Ross, A V M Canario, and G Flik Parathyroid hormone-related protein and calcium regulation in vitamin D-deficient sea bream (Sparus auratus) J. Endocrinol., June 1, 2007; 193(3): 473 - 480. [Abstract] [Full Text] [PDF]

				P. M. Guerreiro, J. L. Renfro, D. M. Power, and A. V. M. Canario The parathyroid hormone family of peptides: structure, tissue distribution, regulation, and potential functional roles in calcium and phosphate balance in fish Am J Physiol Regulatory Integrative Comp Physiol, February 1, 2007; 292(2): R679 - R696. [Abstract] [Full Text] [PDF]

				J. Fuentes, J. Figueiredo, D. M. Power, and A. V. M. Canario Parathyroid hormone-related protein regulates intestinal calcium transport in sea bream (Sparus auratus) Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2006; 291(5): R1499 - R1506. [Abstract] [Full Text] [PDF]

				W. Abbink, G. S. Bevelander, X. Hang, W. Lu, P. M. Guerreiro, T. Spanings, A. V. M. Canario, and G. Flik PTHrP regulation and calcium balance in sea bream (Sparus auratus L.) under calcium constraint J. Exp. Biol., September 15, 2006; 209(18): 3550 - 3557. [Abstract] [Full Text] [PDF]