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Temperature Modulates the Effects of Ocean Acidification on Intestinal Ion Transport in Atlantic Cod, Gadus morhua

Artikel i vetenskaplig tidskrift
Författare M. Y. Hu
K. Michael
C. M. Kreiss
M. Stumpp
Samuel Dupont
Y. C. Tseng
M. Lucassen
Publicerad i Frontiers in Physiology
Volym 7
ISSN 1664-042X
Publiceringsår 2016
Publicerad vid Sven Lovén centrum för marina vetenskaper
Institutionen för biologi och miljövetenskap
Språk en
Länkar dx.doi.org/10.3389/fphys.2016.00198
Ämnesord thermal compensation, hypercapnia, pH regulation, bicarbonate level, teleost, marine fish osmoregulation, soluble adenylyl-cyclase, branchial, na+/k+-atpase, acid-base-balance, thermal tolerance, rainbow-trout, dependent biogeography, seawater acidification, carbonic-anhydrase, oxygen limitation, Physiology
Ämneskategorier Zoofysiologi

Sammanfattning

CO2-driven seawater acidification has been demonstrated to enhance intestinal bicarbonate secretion rates in teleosts, leading to an increased release of CaCO3 under simulated ocean acidification scenarios. In this study, we investigated if increasing CO2 levels stimulate the intestinal acid-base regulatory machinery of Atlantic cod (Gadus morhua) and whether temperatures at the upper limit of thermal tolerance stimulate or counteract ion regulatory capacities. Juvenile G. morhua were acclimated for 4 weeks to three CO2 levels (550, 1200, and 2200 mu atm) covering present and near-future natural variability, at optimum (10 degrees C) and summer maximum temperature (18 degrees C), respectively. Immunohistochemical analyses revealed the subcellular localization of ion transporters, including Na+/K+-ATPase (NKA), Na+/H+-exchanger 3 (NHE3), Na+/HCO3- cotransporter (NBC1), pendrin-like C1(-)/HCO3- exchanger (SLC26a6), V-type H+-KATPase subunit a (VHA), and Cl- channel 3 (CLC3) in epithelial cells of the anterior intestine. At 10 degrees C, proteins and mRNA were generally up-regulated for most transporters in the intestinal epithelium after acclimation to higher CO2 levels. This supports recent findings demonstrating increased intestinal HCO3- secretion rates in response to CO2 induced seawater acidification. At 18 degrees C, mRNA expression and protein concentrations of most ion transporters remained unchanged or were even decreased, suggesting thermal compensation. This response may be energetically favorable to retain blood HCO3- levels to stabilize pH(e), but may negatively affect intestinal salt and water resorption of marine teleosts in future oceans.

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