Here we document the development of seven novel polymorphic microsatellite markers for the brilliant-thighed poison frog (Dendrobatidae). We found between six and 27 alleles per locus in 100 individuals (50 males, 50 females) from the field site 'Saut Pararé', French Guiana, with an average observed heterozygosity of 0.79. One locus (23) deviated significantly from Hardy-Weinberg equilibrium. We did not find any evidence for linkage disequilibrium among the new loci, or to seven of the already described markers for . We also report cross-species amplification of some of the markers in three other dendrobatid species ( and ).

Trade-offs between immune function and reproduction are common to many organisms. Nevertheless, high energetic resources may eliminate the need for these trade-offs. In this study, we consider the effects of food availability on these trade-offs in a wild population of female sagebrush lizards () during the breeding season. We manipulated food availability by supplementing some lizards but not others. We measured female orange side coloration as an indicator of reproductive state and calculated the bacterial killing capability of collected plasma exposed to as a measure of innate immunity. We found that female lizards show a natural trade-off between reproductive effort and immune function; females under high reproductive investment had lower innate immunity than those at a later reproductive state. We did not detect this trade-off with food supplementation. We show that trade-offs depend on the energetic state of the animal, illustrating that trade-offs between immune function and reproduction can be context-dependent.