Seasonal balance in circulating concentrations predicts variation in annual reproductive performance.

<p>Controlling for variation in clutch initiation dates, individuals who maintain high levels of circulating carotenoids have greater reproductive success. N = 27 individuals.</p

Circulating carotenoids are correlated with feather color, not tail streamer length.

<p>Variation in A) throat color, not B) streamer length, predicts variation in circulating carotenoid in male (shown) and female (similar trends not shown) barn swallows sampled at the beginning of the breeding season. N = 71 individuals.</p

Controlling for possible gender differences, and site differences, individuals who maintained a positive balance of circulating carotenoids were greater in body mass.

<p>Results portrayed are from mixed models of changes in carotenoids between two successive sampling events as a function of morphological measures in males and females. Adjusted R-squared  = 0.53. Numerator degrees of freedom  = 1, <i>ddf =  denominator degrees of freedom</i>. N = 27 individuals.</p

Seasonal changes in feather color are associated with changes in circulating carotenoid concentrations.

<p>Evidence of concomitant changes in carotenoids and ventral color suggesting a dynamic relationship between morphological and physiological traits: melanin-based color fading is strongly associated with a decline in carotenoid concentration in both males and females. N = 12 individuals for whom we had both two sets of carotenoid and feather samples.</p

DRYAD ISRAEL + COLORADO distn of paternity outcomes

This file contains the paternity outcomes associated with the experimental manipulation of phenotype in two different study locations: Israel and Colorado, US

Male barn swallow phenotypic & reproductive data

Data file with maximum tail streamer length, right wing length, and tetrahedral color measures for 4 ventral patches for male barn swallows from the Czech Republic, Romania, Turkey, and Israel. Clutch initiation date is provided for all populations but Romania. There are two years of data for the potential contact zone in Turkey. Color patch codes: T=throat, R=breast, B=belly, and V=vent. Also included are rotated factors summarizing phenotypic characters which were used in analyzing divergence in phenotypes and selection pressures: [BodyBrightness], [ThroatBrightness], [Saturation], and [StreamerLength]. Age is denoted for individuals we could confidently assign to a first-year or older age-class (i.e. which we had banded as a hatchling or which was an unbanded breeder at a site where we had banded all adults the previous year.