BLM REA CYR 2013 Spruce Beetle Damage Points Outside Climate Vulnerable Area From 2000 to 2009

Metadata Updated: November 12, 2020

Regional spruce beetle outbreaks in Alaska have been linked with warmer, longer summers compared to historic averages. Higher summer temperature increased reproductive success and reduced the generation time of spruce beetles on the Kenai Peninsula, where spruce beetle outbreaks have been concurrent with 5 to 6 years of sustained warm summers for at least the past 200 years when stands of mature spruce were available. Longer growing seasons have allowed earlier emergence, attack, and breeding of adult spruce beetles. Warmer decadal average January temperatures would be likely to increase spruce beetle overwinter survival in the CYR study area because temperatures cold enough to kill spruce beetles would be reached less frequently and sustained for less time. Climate vulnerable areas were defined for each decade by the area where mean June-July-August temperatures were = 10.5°C, mean January temperatures were = -21.3°C, and growing season length was = 173 days. Slightly more than 88% of spruce beetle damage observed from 2000 to 2009 in Alaska corresponded spatially with the climate vulnerable area calculated for the 2000s decade. However, the southern border of the CYR study area was at the northernmost extent of the climate vulnerable area during the 2000s decade: 96% of the climate vulnerable area occurred south of the CYR study area. Kernel Density Estimation was performed using Geospatial Modeling Environment (GME) with points of spruce beetle-related damage from 2000 to 2009. The kernel density was used to determine climate thresholds for spruce beetle outbreaks. This dataset provides a distribution of climate conditions meeting the thresholds for spruce beetle outbreaks during the 2000s decade.

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Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Responsible Party Alaska Center for Conservation Science, University of Alaska Anchorage (Point of Contact)
Contact Email
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Bbox East Long -133.235142598
Bbox North Lat 67.8723132017
Bbox South Lat 57.7404772079
Bbox West Long -163.514791057
Coupled Resource
Frequency Of Update notPlanned
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Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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