Notes on the Interspecific Behavioral Relationships of Marsh-Nesting Passerines

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Abstract
Interspecific territoriality is relatively frequent among birds utilizing structurally simple habitats where relatively few divergent modes of exploitation may be available. Although the available diversity in a marsh may permit considerable habitat selection, the resultant habitat segregation is often reinforced by interspecific aggression, whether or not mutually exclusive territories are defended. In some cases habitats overlap broadly, but nest locations are often sharply segregated; this has been observed in the following species: Long-billed Marsh wrens, Telmatodytes palustris, Red winged Blackbirds, Agelaius phoeniceus; Yellow-headed Blackbirds Xanthocephalus xanthocephalus.

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