Genetic polymorphism and evolution in parthenogenetic animals. XII. Observations on Japanese polyploid curculionidae (coleoptera).

Abstract

Triploid and pentaploid individuals of Scepticus insularis, originating from Honshu and Hokkaido, as well as tetraploid individuals of Callirhopalus bifasciatus and Catapionus gracilicornis have been assayed by starch gel electrophoresis.All weevils were parthenogenetic females.The results indicate that there is variation within a parthenogenetic population and that different degrees of polyploidy appear identical. This indicates that the degrees of polyploidy in parthenogenetic weevils originate at abnormalities in spindle orientation as advocated by Takenouchi.

Genetic polymorphism and evolution in parthenogenetic animals. XIII. Changes in the degree of polyploidy in Curculionidae.

“…The results confirm a similar observation made earlier for triploid and pentaploid Scepticus insularis (Takenouchi et al 1983) and Polydrosus mollis (Lokki et al 1976), where an identical overall genotype (phenotype) was found in diploid and triploid parthenogenetic samples. The multiple spindle hypothesis of Suomalainen (1940Suomalainen ( , 1947 is in agreement with these observations.…”

“…May 1983. The enzyme assay methods and controls are as described by Takenouchi et al (1983). The same sixteen enzyme systems, coding for 21 loci, were assayed (cf.…”

“…We have earlier (Takenouchi et al 1983) shown that triploid and pentaploid parthenogenetic females of Scepticus insularis were identical with regard to their genotypes over several enzyme loci. We interpreted this result as evidence for the correctness of the multiple spindle hypothesis.…”

“…There are 4 diploid, 42 triploid, 18 tetraploid, 6 pentaploid, three hexaploid and one decaploid parthenogenetic species or races of Curculionidae (Takenouchi et al 1983;Takenouchi 1983b and1983c). That makes a total of 74 cytologically studied different parthenogenetic forms.…”

Cytogenetics of three parthenogenetic Psocid species (Psocoptera, Psocomorpha)

“…Firstly, one would expect a greater fraction of diploid forms in the parthenogenetic species, if secondary contacts were occuring more regularly. Secondly, a great majority of attempts to achieve matings between a parthenogenetic female and a male of a bisexual population of the nominal species have failed ( Mockford 1971; Smith and Virkki 1978; Takenouchi et al 1983). Parthenogenetic and bisexual forms behave like separate species, i.e.…”