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- Title
A POPULATION DYNAMICS APPROACH TO THE WHEAT BULB FLY DELIA COARCTATA PROBLEM.
- Authors
Kowalski, K.; Benson, J. F.
- Abstract
(I) A key-factor analysis is presented using data on wheat bulb fly populations collected over 12 years from Stackyard field, Rothamsted. (2) The analysis shows that the key-factor causing population change is variation in the number of eggs laid, and this mortality interval (k0) is also shown to be density-dependent with a time delay. (3) Adult emigration and immigration is proposed as the major mechanism of potential egg loss and it is speculated that the delayed aspect of its action is caused by genetic feedback acting through responses to adult density. (4) Larval survival is shown to be dependent upon both egg density and shoot density, although other factors may also be important in determining survival in different years. (5) A population model has been constructed to test the interpretations of the dynamics and it is suggested that the further development of such a model is likely to prove more useful in improving understanding of the problem and in the development of future control procedures than previous models based upon multiple regression techniques.
- Subjects
WHEAT bulb fly; POPULATION dynamics; EGG incubation; ECOLOGY; MULTIPLE regression analysis; INSECT larvae
- Publication
Journal of Applied Ecology, 1978, Vol 15, Issue 1, p89
- ISSN
0021-8901
- Publication type
Article
- DOI
10.2307/2402922