Gut microbes are believed to play a critical role in most animal life, yet fitness effects and cost benefit-tradeoffs incurred by the host are poorly understood. Unlike most hosts studied to date, butterflies largely acquire their nutrients from larval feeding, leaving relatively little opportunity

Movement uses resources that may otherwise be allocated to somatic maintenance or reproduction. How does increased energy expenditure affect resource allocation? Using the butterfly Speyeria mormonia, we tested whether experimentally increased flight affects fecundity, lifespan or flight capacity. W

Data are in microsoft excel .xlsx format. Descriptions of each data type, including units, are in "comments" associated with the headers on each data column on each page. Data were collected on the butterfly Speyeria mormonia, derived from a population in Gunnison County, Colorado, USA and raised in