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1 March 2011 Orientation of Sap Wells Excavated by Yellow-bellied Sapsuckers
Ashley M. Long
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Ambient temperature may influence selection of foraging sites by organisms that use sap as a primary food source. I examined the spatial orientation of sap wells excavated by Yellow-bellied Sapsuckers (Sphyrapicus varius) on pine trees (Pinus spp.; n  =  43) in eastern Kansas. Sap wells were oriented toward the southwest (ā  =  246.04°, s  =  65.46°, P  =  0.004), unlike in previous studies. Benefits of southwesterly sap well orientation may include avoidance of high winds while foraging and increased flow of sap on the sides of trees warmed by afternoon light.

Ashley M. Long "Orientation of Sap Wells Excavated by Yellow-bellied Sapsuckers," The Wilson Journal of Ornithology 123(1), 164-167, (1 March 2011).
Received: 2 November 2009; Accepted: 1 October 2010; Published: 1 March 2011
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