Carol L. Boggs

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Allocation of stored and incoming nutrients to reproduction determines an organism’s age-specific fecundity curve. In holometabolous insects, differences among species in the shape of the curve are correlated with differences in the potential importance of adult food to reproduction. I examined allocation patterns underlying this association. Specific(More)
Nutrients used in reproduction may come from adult feeding or reserves stored from the juvenile stage. The dynamics of allocation from these sources are predicted to differ among nutrient types, depending on the relative availability of each nutrient type from adult and juvenile feeding. Using radiotracer techniques, I examined reproductive allocation of(More)
Introduction Ever since Darwin's time (Darwin, 1874), there has been intense interest in understanding the origins and evolution of sexually dimorphic traits. Butterflies offer spectacular examples of sexual dimorphism associated with wing color variation between males and females (sexual dichromatism). The use of wing color cues in speciation (Silberglied,(More)
The allocation of nutritional resources to reproduction in animals is a complex process of great evolutionary significance. We use compound-specific stable isotope analysis of carbon (GC/combustion/isotope ratio MS) to investigate the dietary sources of egg amino acids in a nectar-feeding hawkmoth. Previous work suggests that the nutrients used in egg(More)
Population structure encompasses all the rules by which a population's gametes come together, including genetic and physiological investment in offspring. We document female use of nutrients donated by males at mating, and complete sperm precedence, in Colias eurytheme Boisduval. The effect of these phenomena on the population structure of this species is(More)
Climate change is expected to alter the distribution and abundance of many species. Predictions of climate-induced population extinctions are supported by geographic range shifts that correspond to climatic warming, but few extinctions have been linked mechanistically to climate change. Here we show that extinctions of two populations of a checkerspot(More)
Both means and year-to-year variances of climate variables such as temperature and precipitation are predicted to change. However, the potential impact of changing climatic variability on the fate of populations has been largely unexamined. We analyzed multiyear demographic data for 36 plant and animal species with a broad range of life histories and types(More)
We have studied pollen feeding habits of ten species of Heliconius butterflies in six major study areas in Trinidad and Costa Rica, and examined inter-species differences in pollen utilization under greenhouse conditions. We found: 1. Females collected significantly more pollen than males. 2. Older individuals generally collected significantly more pollen(More)