Resource allocation to testes in walnut flies and implications for reproductive strategy

Testes size often predicts the winner during episodes of sperm competition. However, little is known about the source of nutrients allocated to testes development, or testes plasticity under varying nutrient availability. Among many holometabolous insects, metabolic resources can derive from the lar...

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Bibliographic Details
Published in:Journal of insect physiology 2010-11, Vol.56 (11), p.1523-1529
Main Authors: Carsten-Conner, Laura D., Papaj, Daniel R., O’Brien, Diane M.
Format: Article
Language:English
Subjects:
adult insects
Aging
Animals
Body Size
Capital breeding
Carbon
Diptera - physiology
fruit flies
Income breeding
insect reproduction
Insects
isotope labeling
Juglans
larvae
Male
male fertility
maternal effect
nitrogen
nutrient availability
nutrient partitioning
nutritional status
phenotypic variation
Reproduction - physiology
Rhagoletis
Rhagoletis juglandis
Sexual Behavior, Animal
Sperm competition
Stable isotope
stable isotopes
testes
Testis - physiology
tissue weight
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Summary:Testes size often predicts the winner during episodes of sperm competition. However, little is known about the source of nutrients allocated to testes development, or testes plasticity under varying nutrient availability. Among many holometabolous insects, metabolic resources can derive from the larval or adult diet. Distinguishing the source of nutrients allocated to testes can shed light on life history factors (such as maternal influences) that shape the evolution of male reproductive strategies. Here we used an experimental approach to assess resource allocation to testes development in walnut flies ( Rhagoletis juglandis) from differing nutritional backgrounds. We fed adult male walnut flies on sugar and yeast diets that contrasted with the larval diet in carbon and nitrogen stable isotope ratios. This design allowed us to assess the dietary source of testes carbon and nitrogen and its change over time. We found significant incorporation of adult dietary carbon into testes, implying that walnut flies are income breeders for carbon (relying more on adult resources). In contrast, we found little evidence that walnut flies incorporate adult dietary nitrogen into testes development. We discuss the implications of these allocation decisions for life history evolution in this species.
ISSN:0022-1910
1879-1611
DOI:10.1016/j.jinsphys.2010.04.024