Nesting Effort and Territorial Male Birds in a Breeding Bird Community

Number of active nests was compared with number of territories of singing male birds determined by spot mapping for 16 common species in north Louisiana. The number of active nests per number of territories ranged from 0 to 2.3. Carolina wrens (Thryothorus ludovicianus), white-eyed vireos (Vireo griseus), yellow-billed cuckoos (Coccyzus americanus), northern orioles (Icterus galbula), orchard orioles (Icterus spurius), common grackles (Quiscalus quiscula), eastern meadowlarks (Sturnella magna), and bobwhites (Colirr.us virginianus) had less than 0.6 nests per territory. American robins (Turdus migratorius), mourning doves (Zenaida macroura), brown thrashers (Toxostoma rufum), and loggerhead shrikes (Lanius ludovicianus) had more than 1.4 nests per territory. Caution is urged when using spot map results to infer reproductive efforts.

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