期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 207, 期 4, 页码 645-653出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.00765
关键词
calcium uptake; drinking rate; salinity; environmental calcium; larvae; gilthead sea bream; Sparus auratus
类别
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 (0-8parts per thousand). 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.
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