The cost of living for freshwater fish in a warmer, more polluted world

I. J. Morgan, D. G. Macdonald, C. M. Wood

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Little of the vast literature on the temperature physiology of freshwater fish is useful in predicting the effects of global warning. In the present review a series of laboratory experiments is reviewed in which rainbow trout (Oncorhynchus mykiss) were exposed to simulated global warming, a 2° C increment superimposed upon the natural thermal regime, in the presence and absence of two common freshwater pollutants, ammonia and acidity (low pH). Simulated global warning had little effect on the growth and physiology of trout fed to satiation over much of the summer. However, in late summer, when ambient water temperature was at its highest, the addition of 2°C caused a marked inhibition of appetite and growth, although this impact was not exacerbated by a reduction in food availability. In winter, +2°C stimulated metabolism, appetite and growth by approximately 30-60%. Exposure of satiation-fed trout to low levels of pollutants produced unexpected results. Ammonia (NH3+NH4+=70μm) stimulated summer growth and energy conversion efficiency, whilst acidification (pH 5.2) increased appetite and growth but caused no disturbance of electrolyte balance. These pollutant effects were additive upon, but not synergistic with, the effects of +2°C. The ability of the fish to acclimate to the experimental conditions was tested with acute lethal temperature and/or toxicant challenges. Fish exposed to +2°C had a slightly (0.2-1.0°C) but significantly higher lethal temperature than those exposed to ambient temperature when fed to satiation. However, there was no evidence of acclimation to either ammonia or low pH. It is concluded that the impact of global warning on freshwater fish will vary seasonally. The additional temperature may provide growth benefits in winter, but may threaten fish populations living towards the upper end of their thermal tolerance zone in (late) summer.

Original languageEnglish
Pages (from-to)345-355
Number of pages11
JournalGlobal Change Biology
Volume7
Issue number4
DOIs
StatePublished - Jun 7 2001

Fingerprint

Fish
fish
Ammonia
cost
Costs
ammonia
Physiology
summer
temperature
Temperature
physiology
pollutant
Acidification
winter
thermal regime
Global warming
Energy conversion
food availability
Metabolism
Acidity

Keywords

  • Acidity
  • Ammonia
  • Fish
  • Global warming
  • Growth
  • Temperature

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

The cost of living for freshwater fish in a warmer, more polluted world. / Morgan, I. J.; Macdonald, D. G.; Wood, C. M.

In: Global Change Biology, Vol. 7, No. 4, 07.06.2001, p. 345-355.

Research output: Contribution to journalArticle

Morgan, I. J. ; Macdonald, D. G. ; Wood, C. M. / The cost of living for freshwater fish in a warmer, more polluted world. In: Global Change Biology. 2001 ; Vol. 7, No. 4. pp. 345-355.
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