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Some Consequences of Adding Fertilizer to Five Michigan Trout Lakes
Author(s) -
Tanner Howard A.
Publication year - 1960
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1960)89[198:scoaft]2.0.co;2
Subject(s) - human fertilization , hypolimnion , thermocline , fertilizer , environmental science , alkalinity , trout , fishery , rainbow trout , ecology , biology , zoology , agronomy , fish <actinopterygii> , eutrophication , nutrient , chemistry , organic chemistry
Inorganic fertilizer was applied to four of a group of six Michigan trout lakes. The thermocline in the three lakes receiving the most fertilizer shifted to a more shallow position. Three of the fertilized lakes decreased in total alkalinity at a greater rate than did the two lakes not fertilized. Fertilization resulted in the oxygen being depleted from the hypolimnion and some oxygen reduction occurred in the thermocline. The volume of oxygenated water remaining under the ice during the critical period of late winter was reduced in the fertilized lakes, and lakes fertilized at the highest rate very nearly approached winterkill conditions. The reduction of oxygen both in summer stagnation periods and in late winter was more severe after the second season of fertilization.