The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.
Identifieur interne : 000582 ( Main/Merge ); précédent : 000581; suivant : 000583The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.
Auteurs : James D. Kieffer [Canada] ; Daniel W. Baker ; Ashley M. Wood ; Christos N. PapadopoulosSource :
- Fish physiology and biochemistry [ 1573-5168 ] ; 2011.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Blood Glucose, Chlorides, Lactic Acid.
- physiology : Fishes, Oxygen.
- physiopathology : Hypoxia.
- Acclimatization, Animals, Osmolar Concentration, Temperature.
Abstract
Atlantic sturgeon (Acipenser oxyrhynchus), which are bottom dwelling and migratory fish, experience environmental hypoxia in their natural environment. Atlantic sturgeon, acclimated to either 5 or 15°C, were subjected to a 1 h severe (<10 mm Hg) hypoxia challenge in order to document their physiological responses. We measured hematological parameters, including O(2) transport (hemoglobin, hematocrit), ionic (chloride, osmolality), and metabolic (glucose, lactate) variables under normoxic conditions (~160 mm Hg), immediately following a 1 h exposure to hypoxic water, and following a further 2 h of recovery from this challenge in normoxic water. In a second experiment, we assessed the opercular beat frequency before, during, and after hypoxic exposure. Hemoglobin concentrations and hematocrit were significantly different between fish held at 5°C vs. 15°C and also significantly different between normoxia prior to hypoxia and following recovery. Plasma lactate concentrations increased following hypoxia at both temperatures, indicative of an increase in anaerobic metabolism. In contrast, a significant increase in plasma glucose concentrations in response to hypoxia only occurred at 5°C, suggesting different fuel demands under different temperatures. Changes in opercular beat frequency (OBF) were dependent on temperature. At 5°C, OBF increased upon exposure to hypoxia, but returned to pre-exposure levels within 35 min for the remainder of the experiment. During hypoxia at 15°C, OBF increased very briefly, but then rapidly (within 20 min) decreased to levels below control values. Following a return to normoxia, OBF quickly increased to control levels. Overall, these findings suggest that Atlantic sturgeons are relatively tolerant to short-term and severe hypoxic stress, and the strategies for hypoxia tolerance may be temperature dependent.
DOI: 10.1007/s10695-011-9479-y
PubMed: 21461903
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Wood</name></author><author><name sortKey="Papadopoulos, Christos N" sort="Papadopoulos, Christos N" uniqKey="Papadopoulos C" first="Christos N" last="Papadopoulos">Christos N. 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Kieffer</name><affiliation wicri:level="1"><nlm:affiliation>Department of Biology, University of New Brunswick, Saint John, NB, Canada. jkieffer@unb.ca</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Biology, University of New Brunswick, Saint John, NB</wicri:regionArea><wicri:noRegion>NB</wicri:noRegion></affiliation></author><author><name sortKey="Baker, Daniel W" sort="Baker, Daniel W" uniqKey="Baker D" first="Daniel W" last="Baker">Daniel W. Baker</name></author><author><name sortKey="Wood, Ashley M" sort="Wood, Ashley M" uniqKey="Wood A" first="Ashley M" last="Wood">Ashley M. Wood</name></author><author><name sortKey="Papadopoulos, Christos N" sort="Papadopoulos, Christos N" uniqKey="Papadopoulos C" first="Christos N" last="Papadopoulos">Christos N. Papadopoulos</name></author></analytic><series><title level="j">Fish physiology and biochemistry</title><idno type="eISSN">1573-5168</idno><imprint><date when="2011" type="published">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acclimatization</term><term>Animals</term><term>Blood Glucose (metabolism)</term><term>Chlorides (metabolism)</term><term>Fishes (physiology)</term><term>Hypoxia (physiopathology)</term><term>Lactic Acid (metabolism)</term><term>Osmolar Concentration</term><term>Oxygen (physiology)</term><term>Temperature</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Blood Glucose</term><term>Chlorides</term><term>Lactic Acid</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Fishes</term><term>Oxygen</term></keywords><keywords scheme="MESH" qualifier="physiopathology" xml:lang="en"><term>Hypoxia</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Acclimatization</term><term>Animals</term><term>Osmolar Concentration</term><term>Temperature</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Atlantic sturgeon (Acipenser oxyrhynchus), which are bottom dwelling and migratory fish, experience environmental hypoxia in their natural environment. Atlantic sturgeon, acclimated to either 5 or 15°C, were subjected to a 1 h severe (<10 mm Hg) hypoxia challenge in order to document their physiological responses. We measured hematological parameters, including O(2) transport (hemoglobin, hematocrit), ionic (chloride, osmolality), and metabolic (glucose, lactate) variables under normoxic conditions (~160 mm Hg), immediately following a 1 h exposure to hypoxic water, and following a further 2 h of recovery from this challenge in normoxic water. In a second experiment, we assessed the opercular beat frequency before, during, and after hypoxic exposure. Hemoglobin concentrations and hematocrit were significantly different between fish held at 5°C vs. 15°C and also significantly different between normoxia prior to hypoxia and following recovery. Plasma lactate concentrations increased following hypoxia at both temperatures, indicative of an increase in anaerobic metabolism. In contrast, a significant increase in plasma glucose concentrations in response to hypoxia only occurred at 5°C, suggesting different fuel demands under different temperatures. Changes in opercular beat frequency (OBF) were dependent on temperature. At 5°C, OBF increased upon exposure to hypoxia, but returned to pre-exposure levels within 35 min for the remainder of the experiment. During hypoxia at 15°C, OBF increased very briefly, but then rapidly (within 20 min) decreased to levels below control values. Following a return to normoxia, OBF quickly increased to control levels. Overall, these findings suggest that Atlantic sturgeons are relatively tolerant to short-term and severe hypoxic stress, and the strategies for hypoxia tolerance may be temperature dependent.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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