While the relationship of SO2 and NOx emissions to ambient air quality and deposition, and to surface water quality, are still matters for debate and clarification, it is generally recognised that fisheries do not thrive in acid waters. An international advisory commission (EIFAC) has reviewed much of the literature and concluded that below pH 5 progressively more severe effects on fish can be expected. Records of acid lakes in Scandinavia and America show that about 50% of lakes below pH 5 are fishless, compared with only one in seven of similar oligotrophic lakes with pH greater than 5. However, it is clear that the status of a fishery is not a simple function of the reported pH of a lake or river. Both field and laboratory studies provide evidence that other water quality factors (such as the levels of aluminium and calcium), biological factors (such as food supply, genetically determined tolerance, adaptation), and ecological factors (such as lake morphology, patterns of hydrological events) are also important. How else can we explain the continued presence of fish in some waters well below pH 5? The paper will present a review of current information from both field and laboratory investigations concerning the responses of fish and fish populations to natural acid conditions in Scandinavian and N. American lakes and rivers, identifying the factors which determine survival and mortality. The conclusions have some significance for remedial actions that may be proposed to allevia...
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Climate change Research Articles published between Aug 08, 2022 to Aug 14, 2022
Aug 15, 2022
Articles Included: 5
Introduction: There is no consensus on the policies that should be seen as implicitly pricing carbon (see World Bank (2019a) for a discussion). The OE...Read More
Gender Equality Research Articles published between Aug 08, 2022 to Aug 14, 2022
Aug 15, 2022
Articles Included: 4
I would like to thank Anna Khakee, Federica Zardo and Ragnar Weilandt for their very useful comments as well as the participants of the workshop of 21...Read More
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