@article {KNZ0075,
	title = {Nest predation and its relationship to habitat and nest density in dickcissels},
	journal = {The Condor},
	volume = {86},
	year = {1984},
	pages = {68 -72},
	abstract = {<p>Analysis of the histories of over 500 Dickcissel (Spiza americana) nests found in eastern Kansas showed that those in old-field habitats suffered more predation than those in prairies. Predation rates on the prairie, were not correlated with the weeks of the nesting season, but those in old-fields varied significantly with time. Although both predation rates and nest densities increased concurrently to a peak during the middle of the nesting season in old-fields, an analysis of the relationship between nest densities per week and both daily predation rates and the percent of nests lost to predators each week indicated that predation was not density-dependent. Predation rates are higher in old-fields than in prairies, not because of greater nest densities, but perhaps because predators are more abundant in old-fields. Snakes are the most probable nest predator, and their method of hunting, by chance encounters rather than by directed search, is suited to the absence of a density-dependent effect of predation on Dickcissel nests</p>},
	keywords = {LTER-KNZ, habitat, nest},
	doi = {10.2307/1367348},
	author = {Zimmerman, J.L.}
}
