Use of Tree Species by Forest Birds during Winter and Summer
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In a mixed conifer forest of the W Sierra Nevada, bird species increased their relative use of incense cedar Calocedrus decurrens in winter compared to summer. Most species revealed a general trend towards increased use of the bark of incense cedar in winter relative to summer. Birds obtain food from under the loose flaky bark of incense cedar more easily than from the more firm, compact bark of other timber species in winter. Overwinter survival of birds may be lowered by reduction in the stocking level of small incense cedar.-from Authors