Publication Type:
Journal ArticleSource:
Auk, American Ornithologists' Union, Volume 104, Issue 2, p.225-233 (1987)Call Number:
A87MOR01IDUSURL:
https://sora.unm.edu/node/24380Keywords:
Hairy Woodpecker, Picoides albolarvatus, Picoides villosus, White-headed WoodpeckerAbstract:
Foraging behavior in the closely related Hairy (Picoides villosus) and White-headed (P. albolarvatus) woodpeckers was examined in an area of sympatry to evaluate interseasonal and intersexual resource use. Similar foraging heights were observed for each species-sex sample during summer, but significant differences were evident during winter. Male and female White-heads maintained similar relative foraging heights between seasons, whereas male and female Hairies foraged relatively higher during winter. Use of tree species differed significantly for each class between seasons, except for male Hairies. Differences in foraging substrates and tree health also were noted interseasonally. All foraged at similar times of day during summer, but negative relationships occurred between times of foraging during winter; foraging times were significantly different between male Hairies and White-heads. A general trend toward decreased overlap in foraging behaviors during winter was a reflection of concentration of foraging activities on live incense cedar (Calocedrus decurrens), especially by female White-heads. This change apparently was due to the presence of an abundant and accessible prey (incense cedar scale, Xylococculus macrocarpae) on cedar. Behavioral shifts in foraging activities may be related to the differential ability to extract prey as a function of bill morphology; such an idea can be extended to intersexual as well as interseasonal considerations. Thus, segregation of foraging activities in these two woodpecker species may be attributed to morphological differences and habitat complexity rather than to competitive interactions dictated by resource limitations.
Notes:
Reference Code: A87MOR01IDUS
Full Citation: Morrison, M. L., and K. A. With. 1987. Interseasonal and intersexual resource partitioning in hairy and white-headed woodpeckers. Auk 104(2): 225-233.
Location: ANIMAL EF: PICOIDES ALBOLARVATUS