Calcium regulation in wild populations of a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens.
Identifieur interne : 000411 ( PubMed/Curation ); précédent : 000410; suivant : 000412Calcium 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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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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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><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19651230</PMID><DateCreated><Year>2009</Year><Month>10</Month><Day>12</Day></DateCreated><DateCompleted><Year>2010</Year><Month>01</Month><Day>11</Day></DateCompleted><DateRevised><Year>2015</Year><Month>11</Month><Day>19</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1531-4332</ISSN><JournalIssue CitedMedium="Internet"><Volume>154</Volume><Issue>4</Issue><PubDate><Year>2009</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Comparative biochemistry and physiology. 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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></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Allen</LastName><ForeName>Peter J</ForeName><Initials>PJ</Initials><AffiliationInfo><Affiliation>Department of Biological Sciences, University of Manitoba, Winnipeg, Canada. pallen@cfr.msstate.edu</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Webb</LastName><ForeName>Molly A H</ForeName><Initials>MA</Initials></Author><Author ValidYN="Y"><LastName>Cureton</LastName><ForeName>Eli</ForeName><Initials>E</Initials></Author><Author ValidYN="Y"><LastName>Bruch</LastName><ForeName>Ronald M</ForeName><Initials>RM</Initials></Author><Author ValidYN="Y"><LastName>Barth</LastName><ForeName>Cameron 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