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INFLUENCE OF EMBRYONIC DEVELOPMENT AND HEAT ON POPULATION TREND OF THREE GRASSHOPPER SPECIES (ORTHOPTERA: ACRIDIDAE) IN SASKATCHEWAN1

Published online by Cambridge University Press:  31 May 2012

M. K. Mukerji
Affiliation:
Research Station, Agriculture Canada, Saskatoon, Saskatchewan
S. H. Gage
Affiliation:
Research Station, Agriculture Canada, Saskatoon, Saskatchewan
R. L. Randell
Affiliation:
Biology Department, University of Saskatchewan, Saskatoon, Saskatchewan

Abstract

The study examined quantitatively the effects of embryonic development in the preceding fall and cumulative heat units from 1 April to 31 July in the current year on density trends of three major grasshopper species (Melanoplus sanguinipes (Fabr.), M. bivittatus (Say), and Camnula pellucida (Scudder)) in Saskatchewan. The influence of adult density of the previous year, embryonic development, heat units, and their interactions were examined by multiple regression analyses for each of the three species to determine their contribution to next year’s adult populations. The models tended to underestimate density during a population increase and to overestimate during a population decline. Combined heat units during the preceding fall and following spring indicated that a general increase in density should occur when heat units were equal to or greater than 1600 °D50.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1977

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References

Baskerville, G. L. and Emin, P.. 1969. Rapid estimation of heat accumulation from maximum and minimum temperatures. Ecology 50: 514517.CrossRefGoogle Scholar
Criddle, N. 1917. Popular and practical entomology. Precipitation in relation to insect prevalence and distribution. Can. Ent. 49: 7780.CrossRefGoogle Scholar
Edwards, R. L. 1960. Relationship between grasshopper abundance and weather conditions in Saskatchewan, 1930–1958. Can. Ent. 92: 619624.CrossRefGoogle Scholar
Edwards, R. L. 1964. Some ecological factors affecting the grasshopper populations of Western Canada. Can. Ent. 96: 307320.CrossRefGoogle Scholar
Gage, S. H., Mukerji, M. K., and Randell, R. L.. 1976. A predictive model for seasonal occurrence of three grasshopper species in Saskatchewan (Orthoptera: Acrididae). Can. Ent. 108: 245253.CrossRefGoogle Scholar
MacCarthy, H. R. 1956. A ten-year study of the climatology of Melanoplus mexicanus mexicanus (Sauss.) (Orthoptera: Acrididae) in Saskatchewan. Can. J. agric. Sci. 36: 445462.Google Scholar
Parker, J. R. 1933. Factors largely responsible for years of grasshopper abundance. Proc. World's Grain Exhibition and Conf., Canada 2: 472473.Google Scholar
Pickford, R. 1960. Survival, fecundity and population growth of Melanoplus bilituratus (Wlk.) (Orthoptera: Acrididae) in relation to date of hatching. Can. Ent. 92: 110.CrossRefGoogle Scholar
Pickford, R. 1966. Development, survival and reproduction of Camnula pellucida (Scudder) (Orthoptera: Acrididae) in relation to climatic conditions. Can. Ent. 98: 158169.CrossRefGoogle Scholar
Pickford, R. 1972. The effects of climatic factors on egg survival and fecundity in grasshoppers. In Hemming, C. F. and Taylor, T. H. C. (Eds.). Proc. int. Study Conf. Current and future problems of Acridology, pp. 257260.Google Scholar
Pickford, R. and Riegert, P. W.. 1964. The fungous disease caused by Entomophthora grylli Fres., and its effects on grasshopper populations in Saskatchewan in 1963. Can. Ent. 96: 11581166.CrossRefGoogle Scholar
Randell, R. L. and Mukerji, M. K.. 1974. A technique for estimating hatching of natural egg populations of Melanoplus sanguinipes (Orthoptera: Acrididae). Can. Ent. 106: 801812.CrossRefGoogle Scholar
Riegert, P. W. 1968. A history of grasshopper abundance surveys and forecasts of outbreaks in Saskatchewan. Mem. ent. Soc. Can. 52.Google Scholar