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An ecological Study of the “Lucerne Flea” (Smynthurus viridis, Linn.)—II

Published online by Cambridge University Press:  10 July 2009

D. Stewart Maclagan
D. Stewart Maclagan
Affiliation:
Research Scholar of the Ministry of Agriculture and Department of Agriculture for Scotland.
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Extract

Following the method of procedure already outlined, the life-history of Smynthurus viridis, its bionomics in sensu stricto, and the influence of environmental factors under controlled laboratory conditions, having been considered, the next step is an examination of the seasonal cycle of events as occurring in nature. Part II is, therefore, devoted largely to an analysis of the field data, coupled with an interpretation thereof as substantiated by critically planned and controlled laboratory experimentation; this reinforcement being rendered necessary on account of a multiplicity of factors acting simultaneously in nature. The chief difficulty in an investigation of this kind (as with all problems concerned with fluctuations in the numbers of organisms) lies in the fact that there are few methods for obtaining quickly and easily an accurate quantitative sample of the numbers and kind of organisms; and, secondly, there is the difficulty of finding (in a long-inhabited country like Britain) a “normal” environment, i.e., one in which purely natural agencies have been allowed free play over a sufficient interval of time to allow a state of equilibrium to have become established between the various members of the community to which Smynthurus belongs, in their relationship to the physical factors of the environment and to each other.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 23 , Issue 2 , July 1932 , pp. 151 - 190
Copyright
Copyright © Cambridge University Press 1932

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