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Stopover On Galapagos During Autumn Migration Of Bobolinks (Dolichonyx Oryzivorus), Noah G. Perlut, Rosalind Renfrew
Stopover On Galapagos During Autumn Migration Of Bobolinks (Dolichonyx Oryzivorus), Noah G. Perlut, Rosalind Renfrew
Environmental Studies Faculty Publications
The Bobolink (Dolichonyx oryzivorus) is the only landbird species that is known to stop every year in Galapagos while migrating; however, its stopover ecology while on the islands is unknown. In October 2015, we searched for and captured Bobolinks in the highlands of San Cristóbal. We found Bobolinks in two fields, separated by 9.15 km, at ∼425 m elevation. Average daily counts of Bobolinks on these two fields were 3.2 ± 1.8 and 4.8 ± 2.3 individuals. We caught nine individuals; body mass and fat reserves varied from 22.5–40.0 g and no fat reserves to 50–100% reserves, respectively. …
High Nest Density Of Sandhill Cranes In Central Wisconsin, Jeb A. Barzen, Liying Su, Anne E. Lacy, Andrew P. Gossens, Dorn M. Moore
High Nest Density Of Sandhill Cranes In Central Wisconsin, Jeb A. Barzen, Liying Su, Anne E. Lacy, Andrew P. Gossens, Dorn M. Moore
Proceedings of the North American Crane Workshop
We conducted aerial surveys to determine nest locations of greater sandhill cranes (Grus canadensis tabida) in central Wisconsin, 2001-2003. Helicopter flights covered 8.90 km2 of wetlands in each year, and we found 41 nests in 2001, 50 nests in 2002, and 48 nests in 2003 from 11 wetlands. Our best estimate of nest density (n = 14) included wetlands containing 5 or more nests and averaged 5.25 ± 0.36 (1 SE) nests/km2 of wetland. Maximum nest density of larger wetlands in any 1 year was 7.80 nests/km2. As some nests had likely failed by …