As part of a larger study of wildlife habitat associations in Douglas-fir (Pseudotsuga menziesii) forests of northwestern California, I recorded characteristics of nest sites used by 16 species of cavity-nesting birds. Pacific madrone (Arbutus menziesii) contributed only 8% of the basal area of the stands I studied, but 24% of all cavity nests were in madrone. Although nests were distributed am...

In order to establish an estimate of the ages of large Pacific madrone (Arbutus menziesii) trees growing atop the bluffs on Magnolia Boulevard in Seattle, Washington, I obtained stump-discs from madrones cut by the Seattle Parks Department in June 1994. Each disc was sectioned into smaller pieces to allow processing with standard woodworking techniques. After initial processing, each slab was s...

Arbutus unedo L. is an evergreen shrub with a circum-Mediterranean distribution that also reaches the Eurosiberian region in northern Iberia, Atlantic France, and a disjunct population in southern Ireland. Due to the variety of climatic conditions across its distribution range, the populations of A. unedo were expected to display local adaptation. Conversely, common garden experiments revealed ...

Araştırmada sandal (Arbutus andrachne L.) ağaçlarında çiçek organ taslaklarının gelişim dönemlerini belirlemek ve büyüme konisindeki şekilsel değişimlerin ayrıntılarının ortaya konulması amaçlanmıştır. Sandal oluşumu gelişimi stereo mikroskopta incelenmiştir. Çiçek tomurcukları, Ocak ayı sonundan Nisan ortalarına kadar 10-15’ar gün arayla alınarak, FAA (formalin, etil alkol, asetik asit) (10:50...