Saturday, March 28, 2009

declining Evening Grosbeak population, part 2

Learn more about the decline of this species. If you've been following research on this topic, a key may be the loss of large areas of older forests with a great degree of structural diversity. Younger, even-aged boreal forests do not seem to provide the habitat needed by EVGR. This species is also associated with spruce budworm, and spraying campaigns that aim to eliminate this forest insect may have an effect on populations. The population is a fraction of what it was 40+ years ago:

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