Whitebark Pine in Crater Lake and Lassen Volcanic National Parks: Assessment of Stand Structure and Condition in a Management and Conservation Perspective
Open Access
- 21 September 2019
- Vol. 10 (10), 834
- https://doi.org/10.3390/f10100834
Abstract
Whitebark pine (Pinus albicaulis. Engelm.) is vulnerable to a number of threats including an introduced pathogen (Cronartium ribicola J.C. Fisch.), epidemic levels of native mountain pine beetle (Dendroctonus ponderosae Hopkins), fire suppression, and climate change. To describe the structure of whitebark pine populations in two national parks in the southern Cascades (Crater Lake, Oregon, USA (CRLA) and Lassen Volcanic, California, USA (LAVO) National Parks), we surveyed trees in 30 × 50 × 50 m plots in both parks. We used these plots to describe the extent of white pine blister rust (the disease caused by Cronartium ribicola), mountain pine beetle occurrence, and to elucidate factors influencing the presence of pests and pathogens, cone production, and canopy kill. In each plot, we recorded data related to tree health, including symptoms of blister rust and mountain pine beetle, and reproductive vigor (cone production). In both parks, encroachment from other species, particularly mountain hemlock (Tsuga mertensiana (Bong.) Carrière), was negatively associated with cone production. In CRLA, water stress was a good predictor of blister rust infection and cone production. For CRLA and LAVO, the presence of mountain pine beetle and blister rust was associated with higher canopy kill for whitebark pine. Lastly, we found evidence for a pest-pathogen interaction, mountain pine beetle attack was greater for trees that showed symptoms of blister rust infection in CRLA. Our results indicate that whitebark pine populations in the southern Cascade Range are experiencing moderate levels of blister rust infection compared with other sites across the species range, and that competition from shade-tolerant species may result in an additional threat to whitebark pine in both parks. We present our findings in the context of park management and situate them in range-wide and regional conservation strategies aimed at the protection and restoration of a declining species.Keywords
Funding Information
- National Parks and Wildlife Service (P12AC10931)
This publication has 48 references indexed in Scilit:
- A general and simple method for obtaining R2 from generalized linear mixed‐effects modelsMethods in Ecology and Evolution, 2012
- AD Model Builder: using automatic differentiation for statistical inference of highly parameterized complex nonlinear modelsOptimization Methods and Software, 2012
- Climate Change Impacts on Western Pacific Northwest Prairies and SavannasNorthwest Science, 2011
- Future climate affects management strategies for maintaining forest restoration treatmentsInternational Journal of Wildland Fire, 2010
- Whitebark pine and white pine blister rust in the Rocky Mountains of Canada and northern MontanaCanadian Journal of Forest Research, 2008
- Spatially Balanced Sampling of Natural ResourcesJournal of the American Statistical Association, 2004
- A knowledge-based approach to the statistical mapping of climateClimate Research, 2002
- Distribution and severity of white pine blister rust and mountain pine beetle on whitebark pine in British ColumbiaCanadian Journal of Forest Research, 2000
- Potential evaporation functions compared on US watersheds: Possible implications for global-scale water balance and terrestrial ecosystem modelingJournal of Hydrology, 1998
- A Generalization of Sampling Without Replacement from a Finite UniverseJournal of the American Statistical Association, 1952