The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.
Identifieur interne : 000332 ( PubMed/Corpus ); précédent : 000331; suivant : 000333The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.
Auteurs : James D. Kieffer ; 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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pubmed:21461903Le document en format XML
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<author><name sortKey="Kieffer, James D" sort="Kieffer, James D" uniqKey="Kieffer J" first="James D" last="Kieffer">James D. Kieffer</name>
<affiliation><nlm:affiliation>Department of Biology, University of New Brunswick, Saint John, NB, Canada. jkieffer@unb.ca</nlm:affiliation>
</affiliation>
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<author><name sortKey="Baker, Daniel W" sort="Baker, Daniel W" uniqKey="Baker D" first="Daniel W" last="Baker">Daniel W. Baker</name>
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<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>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.</title>
<author><name sortKey="Kieffer, James D" sort="Kieffer, James D" uniqKey="Kieffer J" first="James D" last="Kieffer">James D. Kieffer</name>
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<author><name sortKey="Baker, Daniel W" sort="Baker, Daniel W" uniqKey="Baker D" first="Daniel W" last="Baker">Daniel W. Baker</name>
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<author><name sortKey="Wood, Ashley M" sort="Wood, Ashley M" uniqKey="Wood A" first="Ashley M" last="Wood">Ashley M. Wood</name>
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<author><name sortKey="Papadopoulos, Christos N" sort="Papadopoulos, Christos N" uniqKey="Papadopoulos C" first="Christos N" last="Papadopoulos">Christos N. Papadopoulos</name>
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<term>Animals</term>
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<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>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Blood Glucose</term>
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<term>Animals</term>
<term>Osmolar Concentration</term>
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<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>
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<Title>Fish physiology and biochemistry</Title>
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<ArticleTitle>The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon.</ArticleTitle>
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<Abstract><AbstractText>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.</AbstractText>
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<Author ValidYN="Y"><LastName>Wood</LastName>
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