Calcium regulation in wild populations of a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens.
Identifieur interne : 000411 ( PubMed/Corpus ); précédent : 000410; suivant : 000412Calcium regulation in wild populations of a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens.
Auteurs : Peter J. Allen ; Molly A H. Webb ; Eli Cureton ; Ronald M. Bruch ; Cameron C. Barth ; Stephan J. Peake ; W Gary AndersonSource :
- Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [ 1531-4332 ] ; 2009.
English descriptors
- KwdEn :
- MESH :
- chemical , analogs & derivatives : Testosterone.
- chemical , blood : Estradiol, Testosterone.
- chemical , metabolism : Calcium.
- chemical , urine : Calcium, Phosphates.
- metabolism : Fishes.
- physiology : Fishes.
- Animals, Female, Fresh Water, Male, Reproduction.
Abstract
Lake sturgeon, Acipenser fulvescens, are one of a few species of cartilaginous fishes that complete their life cycle entirely in freshwater. Sturgeons maintain very low concentrations of circulating calcium (Ca(2+)) compared with other vertebrates, and therefore, face unique challenges in regard to Ca(2+) regulation, which are likely to be magnified during vitellogenic stages of the reproductive cycle. In the present study, Ca(2+) concentrations and associated hormones of female and male lake sturgeon were examined in two wild populations, and were related to reproductive stage. In both populations, free, bound and total Ca(2+) were low, peaking in mid-late vitellogenic females. Internal Ca(2+) and phosphate (PO(4)(3-)) concentrations were inversely related to environmental concentrations, suggesting that these ions are preferentially retained and that mechanisms for mobilization are up-regulated under diminished environmental concentrations. Plasma 17beta-estradiol, 11-ketotestosterone and testosterone, peaked in mid-late vitellogenic females, while the androgens peaked in spawning males. Urine Ca(2+) was more tightly regulated than other divalent ions and decreased in spawning fish. Therefore, the increases in free plasma Ca(2+), the very low circulating concentrations of free and total Ca(2+), and the increase in PO(4)(3-) and bound Ca(2+) in low Ca(2+) environments indicate unique adaptations to Ca(2+) regulation in the lake sturgeon.
DOI: 10.1016/j.cbpa.2009.07.014
PubMed: 19651230
Links to Exploration step
pubmed:19651230Le document en format XML
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<author><name sortKey="Allen, Peter J" sort="Allen, Peter J" uniqKey="Allen P" first="Peter J" last="Allen">Peter J. Allen</name>
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<author><name sortKey="Webb, Molly A H" sort="Webb, Molly A H" uniqKey="Webb M" first="Molly A H" last="Webb">Molly A H. Webb</name>
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<series><title level="j">Comparative biochemistry and physiology. Part A, Molecular & integrative physiology</title>
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<term>Female</term>
<term>Fishes (metabolism)</term>
<term>Fishes (physiology)</term>
<term>Fresh Water</term>
<term>Male</term>
<term>Phosphates (urine)</term>
<term>Reproduction</term>
<term>Testosterone (analogs & derivatives)</term>
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<front><div type="abstract" xml:lang="en">Lake sturgeon, Acipenser fulvescens, are one of a few species of cartilaginous fishes that complete their life cycle entirely in freshwater. Sturgeons maintain very low concentrations of circulating calcium (Ca(2+)) compared with other vertebrates, and therefore, face unique challenges in regard to Ca(2+) regulation, which are likely to be magnified during vitellogenic stages of the reproductive cycle. In the present study, Ca(2+) concentrations and associated hormones of female and male lake sturgeon were examined in two wild populations, and were related to reproductive stage. In both populations, free, bound and total Ca(2+) were low, peaking in mid-late vitellogenic females. Internal Ca(2+) and phosphate (PO(4)(3-)) concentrations were inversely related to environmental concentrations, suggesting that these ions are preferentially retained and that mechanisms for mobilization are up-regulated under diminished environmental concentrations. Plasma 17beta-estradiol, 11-ketotestosterone and testosterone, peaked in mid-late vitellogenic females, while the androgens peaked in spawning males. Urine Ca(2+) was more tightly regulated than other divalent ions and decreased in spawning fish. Therefore, the increases in free plasma Ca(2+), the very low circulating concentrations of free and total Ca(2+), and the increase in PO(4)(3-) and bound Ca(2+) in low Ca(2+) environments indicate unique adaptations to Ca(2+) regulation in the lake sturgeon.</div>
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<Abstract><AbstractText>Lake sturgeon, Acipenser fulvescens, are one of a few species of cartilaginous fishes that complete their life cycle entirely in freshwater. Sturgeons maintain very low concentrations of circulating calcium (Ca(2+)) compared with other vertebrates, and therefore, face unique challenges in regard to Ca(2+) regulation, which are likely to be magnified during vitellogenic stages of the reproductive cycle. In the present study, Ca(2+) concentrations and associated hormones of female and male lake sturgeon were examined in two wild populations, and were related to reproductive stage. In both populations, free, bound and total Ca(2+) were low, peaking in mid-late vitellogenic females. Internal Ca(2+) and phosphate (PO(4)(3-)) concentrations were inversely related to environmental concentrations, suggesting that these ions are preferentially retained and that mechanisms for mobilization are up-regulated under diminished environmental concentrations. Plasma 17beta-estradiol, 11-ketotestosterone and testosterone, peaked in mid-late vitellogenic females, while the androgens peaked in spawning males. Urine Ca(2+) was more tightly regulated than other divalent ions and decreased in spawning fish. Therefore, the increases in free plasma Ca(2+), the very low circulating concentrations of free and total Ca(2+), and the increase in PO(4)(3-) and bound Ca(2+) in low Ca(2+) environments indicate unique adaptations to Ca(2+) regulation in the lake sturgeon.</AbstractText>
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