Canadian Forest Service Publications

Croisements intraspécifiques et spécification chez quelques gryllides des genres Gryllus et Teleogryllus (Orthoptera : Gryllidae) 1965. Cochaux, P. Can. J. Zool. 43 : 105-124.

Year: 1965

Issued by: Laurentian Forestry Centre

Catalog ID: 15011

Language: French

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Various intraspecific crossings between geographically isolated populations of field crickets have shown that genetic affinity may vary considerably. When present, reproductive isolation is primarily due to physiological divergences resulting from differences in adaptation to climatic conditions, which may or may not be related to morphological differences. Geographic isolation appears to be of secondary importance only in the evolution process. Populations of Gryllus assimilis F. from various island of the West Indies and populations of G. bimaculatus De Geer from South Africa and Formosa have shown a high degree of genetic affinity, although widely isolated geographically. Certain populations of Teleogryllus commodus (Walker) from Australia, although not isolated geographically but subject to considerable climatic differences, have lost their genetic compatibility producing only sterile offspring.