Calcium regulation in wild populations of a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens.
Identifieur interne : 000922 ( Main/Merge ); précédent : 000921; suivant : 000923Calcium regulation in wild populations of a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens.
Auteurs : Peter J. Allen [Canada] ; 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
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pubmed:19651230Le document en format XML
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Webb</name></author><author><name sortKey="Cureton, Eli" sort="Cureton, Eli" uniqKey="Cureton E" first="Eli" last="Cureton">Eli Cureton</name></author><author><name sortKey="Bruch, Ronald M" sort="Bruch, Ronald M" uniqKey="Bruch R" first="Ronald M" last="Bruch">Ronald M. Bruch</name></author><author><name sortKey="Barth, Cameron C" sort="Barth, Cameron C" uniqKey="Barth C" first="Cameron C" last="Barth">Cameron C. Barth</name></author><author><name sortKey="Peake, Stephan J" sort="Peake, Stephan J" uniqKey="Peake S" first="Stephan J" last="Peake">Stephan J. 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Allen</name><affiliation wicri:level="4"><nlm:affiliation>Department of Biological Sciences, University of Manitoba, Winnipeg, Canada. pallen@cfr.msstate.edu</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Biological Sciences, University of Manitoba, Winnipeg</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><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></author><author><name sortKey="Cureton, Eli" sort="Cureton, Eli" uniqKey="Cureton E" first="Eli" last="Cureton">Eli Cureton</name></author><author><name sortKey="Bruch, Ronald M" sort="Bruch, Ronald M" uniqKey="Bruch R" first="Ronald M" last="Bruch">Ronald M. Bruch</name></author><author><name sortKey="Barth, Cameron C" sort="Barth, Cameron C" uniqKey="Barth C" first="Cameron C" last="Barth">Cameron C. Barth</name></author><author><name sortKey="Peake, Stephan J" sort="Peake, Stephan J" uniqKey="Peake S" first="Stephan J" last="Peake">Stephan J. Peake</name></author><author><name sortKey="Anderson, W Gary" sort="Anderson, W Gary" uniqKey="Anderson W" first="W Gary" last="Anderson">W Gary Anderson</name></author></analytic><series><title level="j">Comparative biochemistry and physiology. Part A, Molecular & integrative physiology</title><idno type="eISSN">1531-4332</idno><imprint><date when="2009" type="published">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term><term>Calcium (metabolism)</term><term>Calcium (urine)</term><term>Estradiol (blood)</term><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><term>Testosterone (blood)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analogs & derivatives" xml:lang="en"><term>Testosterone</term></keywords><keywords scheme="MESH" type="chemical" qualifier="blood" xml:lang="en"><term>Estradiol</term><term>Testosterone</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Calcium</term></keywords><keywords scheme="MESH" type="chemical" qualifier="urine" xml:lang="en"><term>Calcium</term><term>Phosphates</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Fishes</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Fishes</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Female</term><term>Fresh Water</term><term>Male</term><term>Reproduction</term></keywords></textClass></profileDesc></teiHeader><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></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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