Adaptive contraction of diet breadth affects sexual maturation and specific nutrient consumption in an extreme generalist omnivore

Journal of Evolutionary Biology
K JensenJules Silverman

Abstract

Animals balance their intake of specific nutrients, but little is known about how they do so when foraging in an environment with toxic resources and whether toxic foods promote adaptations that affect life history traits. In German cockroach (Blattella germanica) populations, glucose aversion has evolved in response to glucose-containing insecticidal baits. We restricted newly eclosed glucose-averse (GA) and wild-type (WT) female cockroaches to nutritionally defined diets varying in protein-to-carbohydrate (P : C) ratio (3 : 1, 1 : 1, or 1 : 3) or gave them free choice of the 3 : 1 and 1 : 3 diets, with either glucose or fructose as the sole carbohydrate source. We measured consumption of each diet over 6 days and then dissected the females to measure the length of basal oocytes in their ovaries. Our results showed significantly lower consumption by GA compared to WT cockroaches when restricted to glucose-containing diets, but also lower fructose intake by GA compared to WT cockroaches when restricted to high fructose diets or given choice of fructose-containing diets. Protein intake was regulated tightly regardless of carbohydrate intake, except by GA cockroaches restricted to glucose-containing diets. Oocyte growth was compl...Continue Reading

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Citations

Feb 26, 2016·The Science of the Total Environment·Taika SmallM Dolores Garcerá
Apr 22, 2016·Pest Management Science·Alexander E KoJules Silverman
Apr 14, 2017·Scientific Reports·Kim JensenJules Silverman
Jul 13, 2018·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Mark C HarrisonCoby Schal
Jul 15, 2021·Journal of Economic Entomology·Samantha McPhersonCoby Schal

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