Effects of Sexual Dimorphism and Landscape Composition on the Trophic Behavior of Greater Prairie-Chicken

摘要: Partitioning of ecological niche is expected in lekking species that show marked sexual size dimorphism as a consequence sex-specific constraints. However, partitioning uncertain with moderate dimorphism. In addition, the may also be affected by landscape composition; particularly, agricultural fragmentation greatly influence trophic behavior herbivores. We studied variation Greater Prairie-Chickens (Tympanuchus cupido), grouse shows sex-dimorphism. are native to tallgrass prairies North America, although populations persist less natural mosaics cropland and habitats. used stable isotope analysis carbon nitrogen blood, claws feathers assess seasonal differences breadth individual specialization between male female Prairie-Chickens, birds living continuous fragmented landscapes. found females showed broader niches higher than males, especially winter autumn. males were smaller spring when converge at leks, suggesting exhibit similar feeding behaviors during period. we greater annual variability conspecifics mosaic Native habitats provide dietary diversity, resulting diversity strategies.