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Master of Arts (MA)
Bach, Andrew J.
Helfield, James M.
Seaside juniper (Juniperus maritima) is a recently discovered tree species endemic to the Salish Sea region and is an as yet unutilized dendrochronological resource. This study reports the first dendrochronological investigation of the species. We sought to determine if Seaside junipers are capable of crossdating, a requirement for consideration as a dendrochronology study species, and to identify correlations between instrumental climate records and radial growth to determine climate-growth response. We collected tree core samples from Seaside juniper in five sites throughout the San Juan Islands and nearby mainland. Samples collected from one of five sites successfully crossdated. Bootstrapped correlation function analysis found the dominant growth-limiting factor of Seaside junipers is growing season minimum temperatures in the prior year (r = 0.547) and in the current year (r = 0.524), potentially indicating a common growth-limiting factor of either temperature or solar irradiance. Understanding this climate-growth relationship will aid in development of a conservation strategy for this rare and endemic species.
dendrochronology, juniper, salish sea, ecology, washington state, wa, seaside juniper, maritima, dendroecology, san juan islands, gulf islands
Western Washington University
Subject – LCSH
Junipers--Salish Sea Region (B.C. and Wash.); Junipers--Climatic factors--Salish Sea Region (B.C. and Wash.); Dendrochronology; Tree-rings
Salish Sea Region (B.C. and Wash.)
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Gleaves, Dustin, "Dendrochronology of Seaside Juniper (Juniperus maritima)" (2018). WWU Graduate School Collection. 748.