Abstract
Oceanic CO2 has increased from 280 to 380 μatm since preindustrial times and is expected to reach 1,900 μatm by 2300. In addition, regional upwelling zones exhibit levels up to 2,300 matm, making exploration at future global projected CO2 levels ecologically relevant today. Recent work has demonstrated that CO2 exposure as low as 1,000 μatm induces acidosis in toadfish (Opansus beta), leading to metabolic compensation by retention of blood in an effort to defend pH. Since increaseHCO-3 serosal HCO-3 translates to increased HCO-3 secretion rates in isolated intestinal tissue, we predicted that blood elevation of and Pco2uring exposure to 1,900 μatm CO2 HCO-3 would increase in vivo base secretion rates. Rectal fluid and CaCO3 excretions were collected from toadfish exposed to 380 (control) and 1,900 μatm CO2 for 72 h. Fluids were analyzed for pH, osmolality, ionic composition, and total CO2. Precipitated CaCO3 was analyzed for titratable alkalinity, Mg2+, and Ca2+ content. Fish exposed to 1,900 μatm CO2 exhibited higher rectal base excretion rates, higher rectal fluid HCO-3 (mmol L-1), and lower fluid Cl- (mmol L-1) than controls, suggesting increased intestinal anion exchange as a result of the compensated respiratory acidosis. This study verifies that imminent projected CO2 levels expected by the year 2300 lead to greater HCO-3 intestinal loss, a process that acts against compensation for a CO2- induced acidosis.
| Original language | English |
|---|---|
| Pages (from-to) | 450-459 |
| Number of pages | 10 |
| Journal | Physiological and Biochemical Zoology |
| Volume | 85 |
| Issue number | 5 |
| DOIs | |
| State | Published - Sep 1 2012 |
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ASJC Scopus subject areas
- Animal Science and Zoology
- Physiology
- Biochemistry
Cite this
Ocean acidification leads to counterproductive intestinal base loss in the gulf toadfish (Opsanus beta). / Heuer, Rachael M.; Esbaugh, Andrew J.; Grosell, Martin.
In: Physiological and Biochemical Zoology, Vol. 85, No. 5, 01.09.2012, p. 450-459.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ocean acidification leads to counterproductive intestinal base loss in the gulf toadfish (Opsanus beta)
AU - Heuer, Rachael M.
AU - Esbaugh, Andrew J.
AU - Grosell, Martin
PY - 2012/9/1
Y1 - 2012/9/1
N2 - Oceanic CO2 has increased from 280 to 380 μatm since preindustrial times and is expected to reach 1,900 μatm by 2300. In addition, regional upwelling zones exhibit levels up to 2,300 matm, making exploration at future global projected CO2 levels ecologically relevant today. Recent work has demonstrated that CO2 exposure as low as 1,000 μatm induces acidosis in toadfish (Opansus beta), leading to metabolic compensation by retention of blood in an effort to defend pH. Since increaseHCO-3 serosal HCO-3 translates to increased HCO-3 secretion rates in isolated intestinal tissue, we predicted that blood elevation of and Pco2uring exposure to 1,900 μatm CO2 HCO-3 would increase in vivo base secretion rates. Rectal fluid and CaCO3 excretions were collected from toadfish exposed to 380 (control) and 1,900 μatm CO2 for 72 h. Fluids were analyzed for pH, osmolality, ionic composition, and total CO2. Precipitated CaCO3 was analyzed for titratable alkalinity, Mg2+, and Ca2+ content. Fish exposed to 1,900 μatm CO2 exhibited higher rectal base excretion rates, higher rectal fluid HCO-3 (mmol L-1), and lower fluid Cl- (mmol L-1) than controls, suggesting increased intestinal anion exchange as a result of the compensated respiratory acidosis. This study verifies that imminent projected CO2 levels expected by the year 2300 lead to greater HCO-3 intestinal loss, a process that acts against compensation for a CO2- induced acidosis.
AB - Oceanic CO2 has increased from 280 to 380 μatm since preindustrial times and is expected to reach 1,900 μatm by 2300. In addition, regional upwelling zones exhibit levels up to 2,300 matm, making exploration at future global projected CO2 levels ecologically relevant today. Recent work has demonstrated that CO2 exposure as low as 1,000 μatm induces acidosis in toadfish (Opansus beta), leading to metabolic compensation by retention of blood in an effort to defend pH. Since increaseHCO-3 serosal HCO-3 translates to increased HCO-3 secretion rates in isolated intestinal tissue, we predicted that blood elevation of and Pco2uring exposure to 1,900 μatm CO2 HCO-3 would increase in vivo base secretion rates. Rectal fluid and CaCO3 excretions were collected from toadfish exposed to 380 (control) and 1,900 μatm CO2 for 72 h. Fluids were analyzed for pH, osmolality, ionic composition, and total CO2. Precipitated CaCO3 was analyzed for titratable alkalinity, Mg2+, and Ca2+ content. Fish exposed to 1,900 μatm CO2 exhibited higher rectal base excretion rates, higher rectal fluid HCO-3 (mmol L-1), and lower fluid Cl- (mmol L-1) than controls, suggesting increased intestinal anion exchange as a result of the compensated respiratory acidosis. This study verifies that imminent projected CO2 levels expected by the year 2300 lead to greater HCO-3 intestinal loss, a process that acts against compensation for a CO2- induced acidosis.
UR - http://www.scopus.com/inward/record.url?scp=84859911794&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84859911794&partnerID=8YFLogxK
U2 - 10.1086/667617
DO - 10.1086/667617
M3 - Article
C2 - 22902373
AN - SCOPUS:84859911794
VL - 85
SP - 450
EP - 459
JO - Physiological and Biochemical Zoology
JF - Physiological and Biochemical Zoology
SN - 1522-2152
IS - 5
ER -