The effects of plant and epiphyte interactions on bark exfoliation in Arbutus menziesii

Sheena Cabal, Gavin Kellerman & Shannon McKillop-Herr
Bark provides trees with many important functions, such as nutrient transport and protection, yet the Pacific madrone (Arbutus menziesii) regularly exfoliates its bark. The mechanism for this exfoliation is largely unknown, but is possibly due to biotic pressures, such as epiphyte or poison oak (Toxicodendron diversilobum) growth, or abiotic pressures, like solar radiation exposure. In order to test potential drivers of shedding, we surveyed 49 madrones and neighboring oaks at Hastings Natural History Reserve. For...
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