TY - JOUR
T1 - Effects of chronic environmental acidification and a summer global warming scenario
T2 - Protein synthesis in juvenile rainbow trout (Oncorhynchus mykiss)
AU - Reid, S. D.
AU - Dockray, J. J.
AU - Linton, T. K.
AU - McDonald, D. G.
AU - Wood, C. M.
PY - 1997/1/1
Y1 - 1997/1/1
N2 - Protein synthesis (K(s)), net accretion (K(g)), and degradation (K(d)) in liver, gills, and white muscle were measured using a flooding dose of [3H]phenylalanine in juvenile rainbow trout chronically exposed (90 days) to softwater in the presence or absence of sublethal acidity (H2SO4, pH 5.2) alone or in combination with a 2°C elevation in the normal temperature profile over the months of June-September 1993 (control temperature range 13-24°C). Chronic sublethal exposure to low pH reduced protein synthesis and degradation in both the gill and liver with little apparent impact on white muscle. As a result, protein was increased in the affected tissues. This suggested that both liver and gill have some capacity to compensate for the effects of acid exposure. The 2°C elevation in the normal temperature profile resulted in a slight increase in protein turnover in both gills and liver. However, during the period of peak water temperature, the 2°C elevation in temperature triggered a dramatic reduction in the protein turnover rates in these tissues. The exact mechanism by which these modifications in protein turnover occurred could not be clearly established. Overall, environmental acidification in combination with a summer global warming scenario would decrease fish growth and survival, most notably during periods of peak temperatures.
AB - Protein synthesis (K(s)), net accretion (K(g)), and degradation (K(d)) in liver, gills, and white muscle were measured using a flooding dose of [3H]phenylalanine in juvenile rainbow trout chronically exposed (90 days) to softwater in the presence or absence of sublethal acidity (H2SO4, pH 5.2) alone or in combination with a 2°C elevation in the normal temperature profile over the months of June-September 1993 (control temperature range 13-24°C). Chronic sublethal exposure to low pH reduced protein synthesis and degradation in both the gill and liver with little apparent impact on white muscle. As a result, protein was increased in the affected tissues. This suggested that both liver and gill have some capacity to compensate for the effects of acid exposure. The 2°C elevation in the normal temperature profile resulted in a slight increase in protein turnover in both gills and liver. However, during the period of peak water temperature, the 2°C elevation in temperature triggered a dramatic reduction in the protein turnover rates in these tissues. The exact mechanism by which these modifications in protein turnover occurred could not be clearly established. Overall, environmental acidification in combination with a summer global warming scenario would decrease fish growth and survival, most notably during periods of peak temperatures.
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U2 - 10.1139/f97-109
DO - 10.1139/f97-109
M3 - Article
AN - SCOPUS:0031473351
VL - 54
SP - 2014
EP - 2024
JO - Canadian Journal of Fisheries and Aquatic Sciences
JF - Canadian Journal of Fisheries and Aquatic Sciences
SN - 0706-652X
IS - 9
ER -