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AGGREGATIONS AND WINTER SURVIVAL IN SOUTHERN ALBERTA OF HIPPODAMIA QUINQUESIGNATA (COLEOPTERA: COCCINELLIDAE), A PREDATOR OF THE PEA APHID (HOMOPTERA: APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

A. M. Harper
Affiliation:
Research Station, Agriculture Canada, Lethbridge, AlbertaT1J 4B1
C. E. Lilly
Affiliation:
Research Station, Agriculture Canada, Lethbridge, AlbertaT1J 4B1

Abstract

Aggregations of the ladybird beetle Hippodamia quinquesignata Kirby were found at several sites on the eastern edge of the Rocky Mountains in southern Alberta at altitudes of 1250–2439 m, and also in the Porcupine Hills (1780 m), just east of the Rockies. The beetles apparently migrate from the prairie region where they feed on pea and grain aphids to the aggregation sites in fall, and return to the prairie in spring.

H. quinquesignata can survive southern Alberta winters, but some protection is needed as high mortality sometimes occurs in localized areas of the aggregation sites. Supercooling data indicate that the greatest protection against cold occurs during mid-winter but a considerable amount of cold hardening occurs during the fall. The most critical period for survival appears to be April and May when the beetles have lost much of their cold resistance, and a late spring cold period could cause high mortality.

Résumé

On a observé des rassemblements de la coccinelle Hippodamia quinquesignata Kirby à plusieurs endroits du versant est des Rocheuses du sud de l'Alberta, à des altitudes variant de 1 250 à 2 439 m, et également dans les Porcupine Hills (1 780 m), juste à l'est des Rocheuses. Il semble que les coccinelles migrent de la région des Prairies où elles se nourrissent de pucerons du pois et du grain aux lieux de rassemblement à l'automne et retournent dans les Prairies le printemps venu.

H. quinquesignata peut survivre aux hivers du sud de l'Alberta, mais elle a besoin d'une certaine protection car la mortalité est parfois élevée dans certaines aires des lieux de rassemblement. Les données de surfusion révèlent que la meilleure protection contre le froid se rencontre au milieu de l'hiver, mais qu'une bonne partie de l'acclimatation au froid se fait à l'automne. La période la plus critique de survie semble être avril et mai lorsque les coccinelles ont perdu une grande partie de leur résistance et qu'une vague de froid à la fin du printemps peut causer une forte mortalité.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1982

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References

Chapin, E. A. 1946. Review of the New World species of Hippodamia Dejean. Smithson. misc. Collns 106(11). 39 pp.Google Scholar
Chapman, J. A. 1954. Studies on summit-frequenting insects in western Montana. Ecology 35: 4149.CrossRefGoogle Scholar
Chapman, J. A., Romer, J. I., and Stark, J.. 1955. Ladybird beetles and army cutworm adults as food for grizzly bears in Montana. Ecology 36: 156158.CrossRefGoogle Scholar
Dubach, R., Pratt, D.Smith, F., and Stewart, C. M.. 1959. Possible role of glycerol in winter-hardiness of insects. Nature 184: 288289.CrossRefGoogle Scholar
Edwards, J. G. 1957. Entomology above the timberline: II. The attraction of ladybird beetles to mountain tops. Coleopt's Bull. 11: 4146.Google Scholar
Farrell, J. A. K. 1968. Coccinellid (Col.) swarms on mountain tops in Malawi. Entomologist's mon. Mag. 104: 242.Google Scholar
Fields, G. J. and McMullen, R. D.. 1972. Aggregation sites and behavior of two species of Hippodamia (Coleoptera: Coccinellidae) in south-central British Columbia. J. ent. Soc. Br. Columb. 69: 2527.Google Scholar
Hagen, K. S. 1962. Biology and ecology of predaceous Coccinellidae. A. Rev. Ent. 7: 289326.CrossRefGoogle Scholar
Hodek, I. 1973. Biology of Coccinellidae. Academia Publ. of Czech. Acad. Sci., Prague. 260 pp.CrossRefGoogle Scholar
Lee, R. E. 1980. Aggregation of lady beetles on the shores of lakes (Coleoptera: Coccinellidae). Am. Midland Nat. 104: 295304.CrossRefGoogle Scholar
Salt, R. W. 1961. Principles of insect cold hardiness. A. Rev. Ent. 6: 5574.CrossRefGoogle Scholar
Sømme, L. 1964. Effect of glycerol on cold-hardiness in insects. Can. J. Zool. 42: 87100.CrossRefGoogle Scholar
Takehara, I. and Asahina, E.. 1960. Frost resistance and glycerol content in overwintering insects (In Japanese; English summary). Low Temp. Sci. (Ser. B) 18: 5765.Google Scholar