RELATIONSHIP BETWEEN NEST SUCCESS AND CONCEALMENT IN TWO GROUND-NESTING PASSERINES

摘要

We examined vegetation characteristics around nest sites of the Hermit Thrush (Catharus guttatus) and Ovenbird(Seiurus aurocapillus) for three summers in the northern- and mixed-hardwood forests of northern Wisconsin and the Upper Peninsular of Michigan to test the hypothesis that nests with greater concealment are less vulnerable to depredation. Because these two ground-nesting passerines differ in terms of nest structure and behavior Near the nest, they present an opportunity to examine how these two factors influence re Productive success in sympatric species.