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Productive Capacity of North American Lakes as Related to the Quantity and the Trophic Level of Fish, the Lake Dimensions, and the Water Chemistry
Author(s) -
Hayes F. R.,
Anthony E. H.
Publication year - 1964
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(1964)93[53:pconal]2.0.co;2
Subject(s) - standing crop , alkalinity , productivity , environmental science , trophic level , fish <actinopterygii> , fishing , fishery , index (typography) , ecology , hydrology (agriculture) , biology , chemistry , geology , economics , biomass (ecology) , geotechnical engineering , macroeconomics , organic chemistry , world wide web , computer science
The Productivity Index, which is derived (using appropriate factors) from the angling catch, commercial catch, or standing crop of fish, is given by the regression log PI = ‐−.236 + 1.47 · 10 −4 x 1 − 0.517x 2 + 0.287x 3 where x 1 = √10 5 /area in square kilometers, x 2 = log depth in meters, and x 3 = log methyl orange alkalinity in p.p.m. The equation accounts for 67 percent of the variability in Productivity Index, of which 20 percent is due to the area function, 29 percent to depth, and 18 percent to alkalinity.