Population Structure in Heliothis virescens (Lepidoptera: Noctuidae): an Estimate of Gene Flow
| Autor: | Randy Luttrell, Sammy D. Pair, Jane L. Hayes, John L. Goodenough, Amy K. Korman, Don E. Hendricks, Jerry B. Graves, James Mallet, Marvin L. Wall |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Annals of the Entomological Society of America. 86:182-188 |
| ISSN: | 1938-2901 0013-8746 |
| DOI: | 10.1093/aesa/86.2.182 |
| Popis: | Starch gel electrophoresis was used to evaluate the genetic population structure of the tobacco budworm, Heliothis virescens (F.). A total of 1,836 adult male moths were collected from 60 trap sites throughout Texas, Louisiana, Mississippi, Arkansas, and Georgia during a 4-wk period in 1989. An average of 30.6 (±0.4) moths was electrophoretically analyzed per trap. Genotypic proportions showed no significant departures from Hardy-Weinberg expectations, suggesting random mating within populations. Population differentiation, measured by the standardized gene frequency variance, F st, was low ( F st = 0.002 ± 10−4) but highly significant. This indicates an average local population size, Nm , of 135 (±10 using a jackknife estimate), the highest value we can find reported. This figure suggests a combination of high mobility ( m ) and high population size ( N ). Hierarchical F statistics were estimated using three levels: (1) traps within localities, (2) localities (traps within 8 km of each other) within regions, and (3) regions (localities within 80 km of each other). There was significant heterogeneity at all distance scales; however, gene frequency variance between regions and variance between localities within regions was low compared with variance within localities. These F statistics indicate that the extent of a local panmictic population has an average diameter on the order of 8 km or less. |
| Databáze: | OpenAIRE |
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