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5 results for “Protopiophila litigata”
Data from: Epicuticular compounds of Protopiophila litigata (Diptera: Piophilidae): identification and sexual selection across two years in the wild
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Data from: Comparing ageing and the effects of diet supplementation in wild vs. captive antler flies, Protopiophila litigata
1) Few studies have simultaneously compared ageing within genetically similar populations in both laboratory and natural environments. Such comparisons are important for interpreting laboratory studies, because factors such as diet could affect ageing in environment-dependent ways. 2) Using a natural population of antler flies (Protopiophila litigata), we conducted separate factorial experiments in 2012 and 2013 that compared age-specific male survival and mating success in laboratory cages versus a natural field environment while supplementing their diets with protein or sugar. 3) We found consistent and substantial increases in both survival and mating rates in the laboratory compared to the field, but remarkably, despite these large differences actuarial ageing was only higher in the lab than in the field in 2012 and similar in the two environments in 2013. In both years, there was no difference between environments in reproductive ageing. 4) We found that males fed protein had a higher mortality rate than males fed sugar (strong and low support in 2012 and 2013 respectively). 5) In contrast, diet did not strongly impact average mating rates, actuarial ageing, or reproductive ageing in either experiment. 6) Our results provide the first evidence that the negative effect of protein on lifespan reported in many laboratory studies can also occur in wild populations, although perhaps less consistently. They also highlight how laboratory environments can influence life history traits and suggest caution when extrapolating from the laboratory to the field.
Data from: Comparing ageing and the effects of diet supplementation in wild vs. captive antler flies, Protopiophila litigata
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Data from: Experimental evidence of condition-dependent sexual dimorphism in the weakly dimorphic antler fly, Protopiophila litigata (Diptera: Piophilidae)
Sexually dimorphic traits have a history of directional selection for exaggeration in at least one sex. Theory suggests that traits targeted by persistent selection should evolve heightened condition dependence whereby their expression reflects the availability and processing efficiency of metabolic resources. This joint dependence of sexual dimorphism and condition dependence on directional selection should result in a positive correlation between the extent of sexual dimorphism and the strength of condition dependence. However, because direct phenotypic evidence is predominately from species with highly exaggerated male traits, it remains unclear whether condition-dependent sexual dimorphism is characteristic of species with more typical levels of dimorphism. We manipulated condition via larval diet and quantified sex-specific responses in adult body size and shape in a moderately dimorphic dipteran species, the antler fly Protopiophila litigata. While dimorphism did not increase with diet quality within any trait, among traits the extent of dimorphism was positively associated with the strength of condition dependence in males but not females, as previously reported for highly dimorphic species. This finding suggests that a shared developmental basis to condition dependence and sexual dimorphism can arise via sexual selection on males even in lineages lacking highly exaggerated male traits.
Data from: Experimental evidence of condition-dependent sexual dimorphism in the weakly dimorphic antler fly, Protopiophila litigata (Diptera: Piophilidae)
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