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Contemporaneous Mortality Factors in Population Dynamics1

Published online by Cambridge University Press:  31 May 2012

R. F. Morris
Affiliation:
Forest Entomology and Pathology Laboratory, Fredericton, N.B.

Abstract

The effect of any mortality factor on population trend is influenced greatly by other factors that operate contemporaneously within the same age interval, and by the extent to which it interacts with these other factors. A general equation which makes provision for different degrees of interaction is proposed as a simplified first step in the study of interaction, and some theoretical examples are presented to illustrate the importance of the interaction coefficient. Methods for obtaining estimates of the coefficient, both through statistical inference from field population data and through direct observation and experimentation, are discussed.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1965

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References

Bess, H. A. 1945. A measure of the influence of natural mortality factors on insect survival. Ann. ent. Soc. Amer. 38: 472481.CrossRefGoogle Scholar
Campbell, R. W. 1963. Some ichneumonid-sarcophagid interactions in the gypsy moth, Porthetria dispar (L.) (Lepidoptera: Lymantriidae). Canad. Ent. 95: 337345.CrossRefGoogle Scholar
Holling, C. S. 1955. The selection by certain small mammals of dead, parasitized, and healthy prepupae of the European pine sawfly, Neodiprion sertifer (Geoff.). Canad. J. Zool. 33: 404419.CrossRefGoogle Scholar
Holling, C. S. 1964. The analysis of complex population processes. Canad. Ent. 96: 335347.CrossRefGoogle Scholar
LeRoux, E. J. and others. 1963. Population dynamics of agricultural and forest insect pests. Mem. ent. Soc. Can. 32. 102 pp.Google Scholar
Macdonald, D. R., and Webb, F. E.. 1963. Insecticides and the spruce budworm. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 288310.Google Scholar
Miller, C. A. 1955. A technique for assessing spruce budworm larval mortality caused by parasites. Canad. J. Zool. 33: 517.CrossRefGoogle Scholar
Mook, L. J. 1963. Birds and the spruce budworm. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 268272.Google Scholar
Morris, R. F. 1949. Differentiation by small mammal predators between sound and empty cocoons of the European spruce sawfly. Canad. Ent. 81: 114120.CrossRefGoogle Scholar
Morris, R. F. 1957. The interpretation of mortality data in studies on population dynamics. Canad. Ent. 89: 4969.CrossRefGoogle Scholar
Morris, R. F. 1959. Single-factor analysis in population dynamics. Ecology 40: 580588.CrossRefGoogle Scholar
Morris, R. F. 1963a. The analysis of generation survival in relation to age-interval survivals. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 3237.Google Scholar
Morris, R. F. 1963b. The effect of predator age and prey defense on the functional response of Podisus maculiventris Say to the density of Hyphantria cunea Drury. Canad. Ent. 95: 10091020.CrossRefGoogle Scholar
Mott, D. G. 1963. The population model for the unsprayed area. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 99109.Google Scholar
Neilson, M. M. 1963. Disease and the spruce budworm. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 272287.Google Scholar
Silver, G. T. 1960. The relation of weather to population trends of the black-headed budworm, Acleris variana (Fern.) (Lepidoptera: Tortricidae). Canad. Ent. 92: 401410.CrossRefGoogle Scholar
Simmonds, F. J. 1948. Some difficulties in determining by means of field samples the true value of parasite control. Bull. ent. Research 39: 435440.CrossRefGoogle Scholar
Thompson, W. R. 1928. A contribution to the study of biological control and parasite introduction in continental areas. Parasitology 20: 90112.CrossRefGoogle Scholar
Watt, K. E. F. 1961. Mathematical models for use in insect pest control. Canad. Ent. Suppl. 19. 62 pp.Google Scholar
Watt, K. E. F. 1963. The analysis of the survival of large larvae in the unsprayed area. In Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31: 5263.Google Scholar