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Nitrite-induced reductions in heat tolerance are independent of aerobic scope in a freshwater teleost
Journal article   Peer reviewed

Nitrite-induced reductions in heat tolerance are independent of aerobic scope in a freshwater teleost

Essie M. Rodgers and Gudrun De Boeck
Journal of experimental biology, Vol.222(23)
2019
DOI: https://doi.org/10.1242/jeb.212035
PMID: 31704898
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Abstract

CTmax Critical thermal maxima Metabolism Nitrite pollution Nutrient pollution Thermal tolerance
Nitrite is a widespread form of pollution that directly lowers the blood oxygen carrying capacity of aquatically respiring species. It is unknown if this impairment of oxygen transport translates into an increased susceptibility to elevated temperatures. We hypothesised that nitrite exposure would lower blood oxygen carrying capacity and decrease both aerobic scope (maximum-standard metabolic rate) and heat tolerance. To test these hypotheses, juvenile European carp (Cyprinus catpio) were exposed to two levels of nitrite (0 mmol l(-1) or 1 mmol l(-1)) for 7 days and haematological parameters, critical thermal maxima (CTmax) and aerobic scope were assessed. Nitrite exposure reduced total haemoglobin by 32.9%. Aerobic scope remained unchanged in fish exposed to nitrite; however, marked declines in CTmax. (1.2 degrees C reduction) were observed in nitrite-exposed fish. These findings demonstrate that nitrite exposure can significantly impair heat tolerance, even when aerobic capacity is maintained.

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12 Times Cited - Web of Science

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Collaboration types
Domestic collaboration
International collaboration
Citation topics
3 Agriculture, Environment & Ecology
3.2 Marine Biology
3.2.116 Aquaculture Nutrition
Web Of Science research areas
Biology
Zoology
ESI research areas
Biology & Biochemistry
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