Variations in Abundance of Certain Invertebrates in William Trelease Woods, 1933-1938

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Abstract
Five years'' data on weekly collections in William Trelease Woods {Urbana, Ill.) are analyzed and correlated with weather data to find the effect of climate upon both seasonal and annual variations in abundance. Conditions favorable to some species are unfavorable to others, so that the relative abundance of various forms changed from year to year. Most invertebrates thrived in moderately warm, humid years. Temp. and humidity influenced the length of the hibernation period. Proper analysis of the relations between climate and abundance of invertebrates can be accomplished only if collections are made over a period much longer than 5 yrs., preferably by one worker, and at frequent intervals, especially in the spring and fall. However, weather conditions cannot explain all the variations in populations.