John Krapek
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View article: Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA
Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA Open
This is the first study to generate and analyze the climate signal in blue intensity (BI) tree-ring chronologies from Alaska yellow-cedar (Callitropsis nootkatensis (D. Don) Oerst. ex D.P. Little). The latewood BI chronology shows a much s…
View article: From canopy to seed: Loss of snow drives directional changes in forest composition
From canopy to seed: Loss of snow drives directional changes in forest composition Open
Climate change is altering the conditions for tree recruitment, growth, and survival, and impacting forest community composition. Across southeast Alaska, USA, and British Columbia, Canada, Callitropsis nootkatensis (Alaska yellow‐cedar) i…
View article: Front Cover
Front Cover Open
The cover image, by John Krapek et al., is based on the Biodiversity Research Despite available habitat at range edge, yellow-cedar migration is punctuated with a past pulse tied to colder conditions, DOI: 10.1111/ddi.12630. Photo Credit: …
View article: Despite available habitat at range edge, yellow‐cedar migration is punctuated with a past pulse tied to colder conditions
Despite available habitat at range edge, yellow‐cedar migration is punctuated with a past pulse tied to colder conditions Open
Aim To explore the recent (past ~1,000 year) migration history of yellow‐cedar ( Callitropsis nootkatensis ), a climate‐threatened tree, which appears to lag behind its potential climatic niche at a leading northern range edge, and infer i…
View article: Alternative interpretation and scale-based context for “No evidence of recent (1995–2013) decrease of yellow-cedar in Alaska” (Barrett and Pattison 2017)
Alternative interpretation and scale-based context for “No evidence of recent (1995–2013) decrease of yellow-cedar in Alaska” (Barrett and Pattison 2017) Open
In their analysis of resampled and remeasured plot data from the USDA Forest Service Forest Inventory and Analysis (FIA) program, Barrett and Pattison (2017, Can. J. For. Res. 47(1): 97–105, doi: 10.1139/cjfr-2016-0335 ) suggest that there…
View article: Landscape-scale establishment and population spread of yellow-cedar (Callitropsis nootkatensis) at a leading northern range edge
Landscape-scale establishment and population spread of yellow-cedar (Callitropsis nootkatensis) at a leading northern range edge Open
Yellow-cedar is a long-lived conifer of the North Pacific Coastal Temperate Rainforest region that is thought to be undergoing a continued natural range expansion in southeast Alaska. Yellow-cedar is locally rare in northeastern portions o…
View article: Emerging climate‐driven disturbance processes: widespread mortality associated with snow‐to‐rain transitions across 10° of latitude and half the range of a climate‐threatened conifer
Emerging climate‐driven disturbance processes: widespread mortality associated with snow‐to‐rain transitions across 10° of latitude and half the range of a climate‐threatened conifer Open
Climate change is causing rapid changes to forest disturbance regimes worldwide. While the consequences of climate change for existing disturbance processes, like fires, are relatively well studied, emerging drivers of disturbance such as …
View article: Watershed-scale forest biomass distribution in a perhumid temperate rainforest as driven by topographic, soil, and disturbance variables
Watershed-scale forest biomass distribution in a perhumid temperate rainforest as driven by topographic, soil, and disturbance variables Open
Temperate rainforests are the most carbon dense forest ecosystem on the planet, with C stocks several times higher than most other forested biomes. While climatic and disturbance drivers of these C stocks are relatively well explored, the …
View article: Increased wintertime CO<sub>2</sub> loss as a result of sustained tundra warming
Increased wintertime CO<sub>2</sub> loss as a result of sustained tundra warming Open
Permafrost soils currently store approximately 1672 Pg of carbon (C), but as high latitudes warm, this temperature‐protected C reservoir will become vulnerable to higher rates of decomposition. In recent decades, air temperatures in the hi…