The physiological responses of green sturgeon (Acipenser medirostris) to potential global climate change stressors.
Identifieur interne : 002575 ( Main/Exploration ); précédent : 002574; suivant : 002576The physiological responses of green sturgeon (Acipenser medirostris) to potential global climate change stressors.
Auteurs : Brian A. Sardella [États-Unis] ; Dietmar KültzSource :
- Physiological and biochemical zoology : PBZ [ 1537-5293 ]
English descriptors
- KwdEn :
- MESH :
- geographic : California.
- physiology : Acclimatization, Fishes.
- Animals, Climate Change, Estuaries, Osmolar Concentration, Salinity, Seasons, Tidal Waves.
Abstract
The green sturgeon (Acipenser medirostris) is an anadromous species with a distinct population segment in the San Francisco Bay-Sacramento River Delta that is currently listed as threatened. Although this species is able to tolerate salinity challenges as soon as 6 mo posthatch, its ability to deal with unpredictable salinity fluctuations remains unknown. Global climate change is predicted to result in large freshwater (FW) flushes through the estuary during winter and greater tidal influence during the summer. We exposed green sturgeon acclimated to 15 (EST) or 24 (BAY) g/L salinity to a rapid FW influx, where salinity was reduced to 0 g/L in 3 h in order to simulate the effect of the "winter" scenario. Both groups survived, enduring a 10% plasma osmolality reduction after 3 h. BAY-acclimated sturgeon upregulated both Na(+), K(+)-ATPase (NKA) activity and caspase 3/7 activity, but no changes were observed in the EST-acclimated fish. In addition, we exposed FW-acclimated sturgeon to a dual 12-h salinity fluctuation cycle (0-24-0 g/L) in order to simulate the effect of greater tidal influence. At 6 h, the sturgeon showed a significant increase in plasma osmolality, and branchial NKA and caspase 3/7 activities were increased, indicating an acclimation response. There was no acclimation at 18 h, and plasma osmolality was higher than the peak observed at 6 h. The second fluctuation elicited an upregulation of the stress proteins ubiquitin and heat shock 70-kDa protein (HSP 70). Sturgeon can acclimate to changes in salinity; however, salinity fluctuations resulted in substantial cellular stress.
DOI: 10.1086/675494
PubMed: 24769709
Affiliations:
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Sardella</name><affiliation wicri:level="2"><nlm:affiliation>Department of Animal Science, University of California, Davis, One Shields Avenue, Davis, California 95616.</nlm:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Californie</region></placeName><wicri:cityArea>Department of Animal Science, University of California, Davis, One Shields Avenue, Davis</wicri:cityArea></affiliation></author><author><name sortKey="Kultz, Dietmar" sort="Kultz, Dietmar" uniqKey="Kultz D" first="Dietmar" last="Kültz">Dietmar Kültz</name></author></analytic><series><title level="j">Physiological and biochemical zoology : PBZ</title><idno type="eISSN">1537-5293</idno></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acclimatization (physiology)</term><term>Animals</term><term>California</term><term>Climate Change</term><term>Estuaries</term><term>Fishes (physiology)</term><term>Osmolar Concentration</term><term>Salinity</term><term>Seasons</term><term>Tidal Waves</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>California</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Acclimatization</term><term>Fishes</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Climate Change</term><term>Estuaries</term><term>Osmolar Concentration</term><term>Salinity</term><term>Seasons</term><term>Tidal Waves</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The green sturgeon (Acipenser medirostris) is an anadromous species with a distinct population segment in the San Francisco Bay-Sacramento River Delta that is currently listed as threatened. Although this species is able to tolerate salinity challenges as soon as 6 mo posthatch, its ability to deal with unpredictable salinity fluctuations remains unknown. Global climate change is predicted to result in large freshwater (FW) flushes through the estuary during winter and greater tidal influence during the summer. We exposed green sturgeon acclimated to 15 (EST) or 24 (BAY) g/L salinity to a rapid FW influx, where salinity was reduced to 0 g/L in 3 h in order to simulate the effect of the "winter" scenario. Both groups survived, enduring a 10% plasma osmolality reduction after 3 h. BAY-acclimated sturgeon upregulated both Na(+), K(+)-ATPase (NKA) activity and caspase 3/7 activity, but no changes were observed in the EST-acclimated fish. In addition, we exposed FW-acclimated sturgeon to a dual 12-h salinity fluctuation cycle (0-24-0 g/L) in order to simulate the effect of greater tidal influence. At 6 h, the sturgeon showed a significant increase in plasma osmolality, and branchial NKA and caspase 3/7 activities were increased, indicating an acclimation response. There was no acclimation at 18 h, and plasma osmolality was higher than the peak observed at 6 h. The second fluctuation elicited an upregulation of the stress proteins ubiquitin and heat shock 70-kDa protein (HSP 70). Sturgeon can acclimate to changes in salinity; however, salinity fluctuations resulted in substantial cellular stress.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><noCountry><name sortKey="Kultz, Dietmar" sort="Kultz, Dietmar" uniqKey="Kultz D" first="Dietmar" last="Kültz">Dietmar Kültz</name></noCountry><country name="États-Unis"><region name="Californie"><name sortKey="Sardella, Brian A" sort="Sardella, Brian A" uniqKey="Sardella B" first="Brian A" last="Sardella">Brian A. 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