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LIFE CYCLE PATHWAYS AND THE ANALYSIS OF COMPLEX LIFE CYCLES IN INSECTS

Published online by Cambridge University Press:  31 May 2012

H.V. Danks
H.V. Danks
Affiliation:
Biological Survey of Canada (Terrestrial Arthropods), Zoology Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Ontario, Canada K1P 6P4
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Abstract

The structure and temporal control of insect life cycles can best be understood by viewing them as pathways along which various options (e.g. develop or enter diapause; grow rapidly or grow slowly) are chosen in response to environmental controls such as photoperiod and temperature. Simple life cycles include small numbers of such options. The combination of several successive simple elements, however, can produce remarkably complex life cycle patterns, which are more prevalent than most entomologists have recognized. The ways in which these simple elements contribute to life cycle pathways are outlined and illustrated schematically. Flow charts showing the successive decision points in the life cycle then are constructed for selected species. This approach confirms the different simple elements, and shows how they are used in combination to control seasonal life cycles in nature.

Résumé

La structure et la maîtrise temporelle des cycles vitaux des insectes peuvent être comprises le mieux en les considérant comme chemins, le long desquels des options variées sont choisies (p. ex. : de métamorphoser ou d’entrer en diapause; de croître rapidement ou de croître lentement) en réponse à des facteurs régleurs tels que la photopériode et la température. Les cycles vitaux simples n’ont que très peu de ces options. L’association de plusieurs éléments simples successifs, cependant, peut produire des patrons de cycles vitaux remarquablement complexes, qui sont plus prévalants que reconnus par la plupart des entomologistes. La manière dont ces éléments simples contribuent aux chemins des cycles vitaux est décrite et illustrée schématiquement. Des organigrammes qui signalent les points de décision pendant le cycle vital ont été dessinés en ce qui concerne certaines espèces sélectionnées. Cette manière d’aborder ces problèmes corrobore l’existence des éléments simples différents et démontre comment ils peuvent être utilisés ensemble pour maîtriser les cycles vitaux saisonniers en nature.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 23 - 40
Copyright
Copyright © Entomological Society of Canada 1991

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