Topic
Lepidoptera genitalia
About: Lepidoptera genitalia is a research topic. Over the lifetime, 10114 publications have been published within this topic receiving 78876 citations. The topic is also known as: Uncus.
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TL;DR: Combining molecular characters with morphological and behavioral characters improved identification of Dioryctria species and supported previous species group relationships.
Abstract: Species of Dioryctria Zeller (Lepidoptera: Pyralidae) are important pests of conifers, particularly in seed orchards, and accurate species identification is needed for effective monitoring and control. Variable forewing morphology and lack of species-specific genitalic features hinder identification, prompting the search for additional diagnostic characters. Mitochondrial DNA (mtDNA) sequences from the cytochrome c oxidase I and II genes (COI and COII) were obtained from specimens collected at lights, pheromone traps, and host plants in the Pacific Northwest, focusing on a U.S. Forest Service seed orchard in Chico, CA. A 475-bp fragment of COI was used to identify eight distinct genetic lineages from 180 Dioryctria specimens, and these were identified as eight described species. Comparisons among mtDNA variation, adult morphology, larval host association, and pheromone attraction were used to assign individuals to species groups and to identify diagnostic characters for species identification. A ...
23 citations
TL;DR: An introduction to embedded systems using ansi c and the released physics c multiple choice ap exams and psychological testing principles and applications are introduced.
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23 citations
TL;DR: Total reduction of lepidoptera was higher in wet than dry forest, probably due to a higher proportion of geometrid larvae, and lower density of bilberry in the wet forest.
Abstract: Lepidoptera larvae are important prey for capercaillie chicks {Tetrao urogallus), but utilization varies among habitats. This field experiment investigates the effects of larval feeding behaviour, abundance and the density of bilberry (Vacciniwn myrtillus) on utilization of larvae by a group of four capercaille chicks and also tests whether chick utilization differs between wet and dry coniferous forest. In fenced plots, four hand‐raised chicks were released for a 15 min feeding period. Reduction of geometrid larvae was correlated positively with their abundance but correlated negatively with bilberry density. Geometrids had a much higher predation risk than pyralids and tortricids, probably because they are exposed while feeding, in contrast to pyralids and tortricids. Total reduction of lepidoptera was higher in wet than dry forest, probably due to a higher proportion of geometrid larvae, and lower density of bilberry in the wet forest. The manner of insect feeding and habitat type (e.g. wet and dry for...
23 citations
TL;DR: Resource limitation and 'non-specific' exploitative competition was thus found in the Lepidoptera community.
Abstract: The larvae of a number of Lepidoptera species inhabit galls induced by the rust fungus Ravenelia macowaniana on Acacia karroo in South Africa, and the community appears to fulfill the conditions required for interspecific competition. Therefore, the aim of this study was to determine if the predominantly polyphagous moth community utilizing this ephemeral, patchily distributed, yet high quality, resource, showed evidence of exploitative intraspecific and interspecific competition. The galls were found to be extensively utilized with over 93% of galls occupied and between 50- 80° of gall tissue consumed. Fewer than 0.6% of the larvae were parasitized. Significant, positive intra- and interspecific aggregation occurred in the galls and the mean number of species per gall was consistently greater than one. A threshold density of 13 individuals, representing a total moth biomass of 12.74 mg, was found above which body mass compensation occurred. Resources are therefore limited in the community. The species were positively associated as a result of a common habitat affinity. Species abundances also covaried positively in a common response to resource conditions. Resource limitation and 'non-specific' exploitative competition was thus found in the Lepidoptera community.
23 citations
TL;DR: In two experiments, reciprocal crosses between a Cry2Ab resistant colony and a susceptible colony established populations where the frequency of the allele that conferred resistance was 0.5, and there was no significant decline in resistance frequencies, and thus the Cry2 Ab form of resistance does not seem to exhibit marked fitness costs under laboratory conditions.
Abstract: Population cage experiments were employed to detect variability in fitness among Cry2Ab resistant and Cry2Ab susceptible genotypes of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae). In two experiments, reciprocal crosses between a Cry2Ab resistant colony (SP15) and a susceptible colony (GR) established populations where the frequency of the allele that conferred resistance was 0.5. Experimental populations were then maintained without exposure to Cry toxins. At the F2 generation and on later occasions, the pooled egg output from each population was sampled, and emerging neonate larvae were screened to monitor the frequency of the resistant allele. Resistance is recessive so homozygous resistant insects could be readily identified as they are the only genotype to survive and grow when exposed to a discriminating concentration of Cry2Ab toxin. Assuming Hardy—Weinberg equilibrium after the F1 generation, and the persistence of a 1:1 ratio of resistant and susceptible alleles, one quarter of ...
23 citations