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Gavan P.L. Watson

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Fragmented & Young Forest preferred by Migrating Songbirds

August 19, 2009 by Gavan 3 Comments

Black-throated Green Warbler
Creative Commons License photo credit: Jim Frazier

Research published in Vol. 126, Iss. 3, pg. 579 of The Auk has some interesting implications for habitat conservation for migrating bird species here in eastern North America. In short, during Spring and Fall migration, migrants showed no preference for stopover locations based on distance from a continuous, connected (river corridor) habitat, nor were they more likely to be concentrated in one forest patch over another. Plainly, the migrating birds appear to show no preference for connected habitats versus fragmented ones. Clearly, if this is the case, birds are using other criteria to select where they stop while migrating.

What is interesting, and not surprising, is the finding that during Fall migration, birds do select habitat described as “early succession forest” with high density of native and non-native fruit-bearing trees and shrubs. In the cannon of conservation, habitats that are fragmented or in the early stages of succession are seen as lower quality when compared to continuous and stable habitats. And this may still be the case when it comes to nesting (less nest predation in larger forests, for example)—but it would seem as though we might need to re-evaluate the assumption that these younger, more fragmented landscapes are of little or no use to birds and ultimately, bird conservation.

As migratory stopovers, it would seem that all forested landscapes—no matter how mature—are important.

Posted in: Birds Tagged: Birds, conservation, habitat, migration, research findings

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Gavan Watson headshot Work life? Director, Centre for Innovation in Teaching and Learning & Associate Vice President, Teaching and Learning at Memorial University with a Ph.D. in environmental education. Home life? Father, naturalist, photographer, husband, philosopher, & member of a hybrid human-dog pack.

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