title: Ecology. Lean winters hinder birds' summertime breeding efforts.
authors.forename: Jocelyn
authors.initials: J
authors.lastname: Kaiser
mesh_terms: D025041:Animal Migration; D000818:Animals; D001947:Breeding; D002247:Carbon Isotopes / Q000097:blood; D017753:Ecosystem; D004777:Environment; D005260:Female; D008297:Male; D012098:Reproduction; D012621:Seasons; D020308:Songbirds / Q000502:physiology*; D014197:Trees
chemical_list: D002247:Carbon Isotopes