| use of fecundity measured directly throughout the breeding season to test a source-sink demographic model. | populations of landbirds (bird species that occupy terrestrial habitats for most of their life cycle) are declining throughout north america (north of mexico) and europe, yet little is known about how demography is driving this trend. a recent model of 5 geographically separated populations of cerulean warblers (dendroica cerulea) that was based on within-season sampling of nest survival and fledgling success shows that all populations are sinks (annual reproduction is consistently less than ann ... | 2011 | 21967245 |