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Full-Text Articles in Entomology
Variation In Population Sex Ratio And Mating Success Of Asexual Lineages Of Alsophila Pometaria (Lepidoptera: Geometridae), Lawrence G. Harshman, Douglas J. Futuyma
Variation In Population Sex Ratio And Mating Success Of Asexual Lineages Of Alsophila Pometaria (Lepidoptera: Geometridae), Lawrence G. Harshman, Douglas J. Futuyma
Lawrence G. Harshman Publications
Populations of Alsophila pometaria (Harris) are largely gynogenetic and composed of asexual females that must mate with a conspecific male to reproduce. Within this asexual contingent, there are a variety of electrophoretically defined multilocus genotypes. In this study we found that populations differ in sex ratio. We also found that there is an indication of differential mating success among asexual genotypes in a population of A. pometaria.
Male Reproductive Parasitism: A Factor In The Africanization Of European Honey-Bee Populations, Thomas E. Rinderer, Richard L. Hellmich Ii, Anita M. Collins, Robert G. Danka
Male Reproductive Parasitism: A Factor In The Africanization Of European Honey-Bee Populations, Thomas E. Rinderer, Richard L. Hellmich Ii, Anita M. Collins, Robert G. Danka
Richard L Hellmich
Africanized drone honey bees (Apis mellifera) migrate into European honey-bee colonies in large numbers, but Africanized colonies only rarely host drones from other colonies. This migration leads to a strong mating advantage for Africanized bees since it both inhibits European drone production and enhances Africanized drone production
Male Effects On Fecundity In Drosophila Melanogaster, Ary A. Hoffman, Lawrence G. Harshman
Male Effects On Fecundity In Drosophila Melanogaster, Ary A. Hoffman, Lawrence G. Harshman
Lawrence G. Harshman Publications
Effects of male Drosophila melanogaster on female fecundity and productivity were examined, considering both females held in containers with males and females exposed to male effects not involving contact. Females were more fecund when male effects were present, and the largest increase was recorded when vials were previously conditioned by males. This effect was probably due to the growth of transmitted microorganisms, which were observed on the laying surface, as further experiments with vials conditioned by virgin females showed a similar increase in fecundity. A male-specific effect was isolated by conditioning bottles containing only agar with males and virgin females. …
The Origin And Distribution Of Clonal Diversity In Alsophila Pometaria (Lepidoptera: Geometridae), Lawrence G. Harshman, Douglas J. Futuyma
The Origin And Distribution Of Clonal Diversity In Alsophila Pometaria (Lepidoptera: Geometridae), Lawrence G. Harshman, Douglas J. Futuyma
Lawrence G. Harshman Publications
A survey of spatial and temporal variation in the frequency of electrophoretically defined genotypes in the geometrid moth Alsophila pometaria revealed a high diversity of uncommon or rare asexual genotypes and clinal distributions of two of the more common clones. There was substantial year-to-year variation in genotype frequencies in seven of eleven sites. Progeny tests have revealed that sexual reproduction is uncommon in two populations and that new asexual genotypes arise from the sexual population. The recurrent origin of asexual genotypes is likely to account for the high genetic and ecological diversity of the asexual contingent of this species’ populations, …
Unidirectional Reproductive Incompatibility Between Aedes (Protomacleaya) Brelandi And A. (P.) Hendersoni (Diptera: Culicidae)., David B. Taylor, George B. Craig
Unidirectional Reproductive Incompatibility Between Aedes (Protomacleaya) Brelandi And A. (P.) Hendersoni (Diptera: Culicidae)., David B. Taylor, George B. Craig
David B Taylor
Forced mating was used to determine reproductive compatibility between two species in the Triseriatus Group of Aedes (Protomacleaya). In the cross between A. hendersoni Cockerell females and A. brelandi Zavortink males, only 7% of the females laid eggs that developed embryos. Furthermore, <5% of the eggs from single-female clutches in which one or more eggs did embryonate were fertile. In the reciprocal cross, A. brelandi females crossed to A. hendersoni males, 70% of the females laid fertile eggs and >80% of the eggs from those females became embryonated. Approximately 80% of the females were inseminated in both of the reciprocal crosses, No chromosomal abnormalities were observed in the hybrids. Incompatibility between the A. brelandi male genome and the A. hendersoni female cytoplasm appeared to be the cause of the reduced fertility.