Linked Life Data

19838713

Source:http://linkedlifedata.com/resource/pubmed/id/19838713

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-2-12
pubmed:abstractText
Acidification of ocean surface waters by anthropogenic carbon dioxide (CO(2)) emissions is a currently developing scenario that warrants a broadening of research foci in the study of acid-base physiology. Recent studies working with environmentally relevant CO(2) levels, indicate that some echinoderms and molluscs reduce metabolic rates, soft tissue growth and calcification during hypercapnic exposure. In contrast to all prior invertebrate species studied so far, growth trials with the cuttlefish Sepia officinalis found no indication of reduced growth or calcification performance during long-term exposure to 0.6 kPa CO(2). It is hypothesized that the differing sensitivities to elevated seawater pCO(2) could be explained by taxa specific differences in acid-base regulatory capacity. In this study, we examined the acid-base regulatory ability of S. officinalis in vivo, using a specially modified cannulation technique as well as (31)P NMR spectroscopy. During acute exposure to 0.6 kPa CO(2), S. officinalis rapidly increased its blood [HCO(3)(-)] to 10.4 mM through active ion-transport processes, and partially compensated the hypercapnia induced respiratory acidosis. A minor decrease in intracellular pH (pH(i)) and stable intracellular phosphagen levels indicated efficient pH(i) regulation. We conclude that S. officinalis is not only an efficient acid-base regulator, but is also able to do so without disturbing metabolic equilibria in characteristic tissues or compromising aerobic capacities. The cuttlefish did not exhibit acute intolerance to hypercapnia that has been hypothesized for more active cephalopod species (squid). Even though blood pH (pHe) remained 0.18 pH units below control values, arterial O(2) saturation was not compromised in S. officinalis because of the comparatively lower pH sensitivity of oxygen binding to its blood pigment. This raises questions concerning the potentially broad range of sensitivity to changes in acid-base status amongst invertebrates, as well as to the underlying mechanistic origins. Further studies are needed to better characterize the connection between acid-base status and animal fitness in various marine species.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1432-136X
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
180
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
323-35
pubmed:meshHeading
pubmed-meshheading:19838713-Acclimatization, pubmed-meshheading:19838713-Acid-Base Equilibrium, pubmed-meshheading:19838713-Acidosis, Respiratory, pubmed-meshheading:19838713-Animals, pubmed-meshheading:19838713-Arginine, pubmed-meshheading:19838713-Bicarbonates, pubmed-meshheading:19838713-Blood, pubmed-meshheading:19838713-Carbon Dioxide, pubmed-meshheading:19838713-Hydrogen-Ion Concentration, pubmed-meshheading:19838713-Hypercapnia, pubmed-meshheading:19838713-Magnetic Resonance Spectroscopy, pubmed-meshheading:19838713-Muscles, pubmed-meshheading:19838713-Organophosphorus Compounds, pubmed-meshheading:19838713-Oxygen, pubmed-meshheading:19838713-Partial Pressure, pubmed-meshheading:19838713-Phosphates, pubmed-meshheading:19838713-Respiratory Rate, pubmed-meshheading:19838713-Seawater, pubmed-meshheading:19838713-Sepia
pubmed:year
2010
pubmed:articleTitle
Acid-base regulatory ability of the cephalopod (Sepia officinalis) in response to environmental hypercapnia.
pubmed:affiliation
Alfred-Wegener-Institute for Polar and Marine Research, 27570, Bremerhaven, Germany. m.gutowska@physiologie.uni-kiel.de
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't