Biological comparisons between arrhenotokous and thelytokous biotypes ofMesochorus nigripes [Hym.: Ichneumonidae] |
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Authors: | W. H. Day R. C. Hedlund |
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Affiliation: | (1) Beneficial Insects Research Laboratory, Agricultural Research Service, USDA, 19713 Newark, Del.;(2) European Parasite Laboratory, 78910 Behoust, France;(3) Present address: USDA Office of International Cooperation and Development, 110021 New Delhi, India |
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Abstract: | The host preferences and sex ratios ofMesochorus biotypes from Sweden and Colorado (U.S.A.) were studied in the field and laboratory. TheseMesochorus are secondary parasites ofBathyplectes spp., parasites ofHypera postica (Gyllenhal). The Colorado biotype is 100% thelytokous, and clearly prefersBathyplectes stenostigma (Thomson) as a host. Only an arrhenotokous biotype was positively detected in Sweden, and it appeared to preferB. curculionis (Thomson). However, some of the data suggest that the thelytokous biotype was probably also present in Sweden, at least inB. stenostigma. The behavioral differences and reproductive isolation of the thelytokous and arrhenotokous biotypes indicate that they are separate sibling species, even though they cannot yet be separated morphologically, and isozyme analyses were inconclusive (possibly due to a mixture of biotypes in Sweden). |
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Keywords: | Biological differentiation Mesochorus biotypes sibling species |
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