BLM REA CYR 2013 Kernel Density of Willow Defoliation Caused by Willow Leafblotch Miner From 2000 to 2014

Metadata Updated: November 12, 2020

Some of the CYR rasters intentionally do not align or have the same extent. These rasters were not snapped to a common raster per the authors' discretion. Please review selected rasters prior to use. These varying alignments are a result of the use of differing source data sets and all products derived from them. We recommend that users snap or align rasters as best suits their own projects. - Willow leafblotch miner was not known in Alaska prior to 1991. From 1991 to 1993, willow leafblotch miner defoliated large areas of willow along the Yukon and Kuskokwim Rivers. From 1998 to 1999, a regional willow leafblotch miner outbreak occurred around the Yukon Flats National Wildlife Refuge. Willow defoliation caused by willow leafblotch miner was observed every year from 2000 to 2014 constant within the CYR study area. Defoliation has occurred on numerous tall and low shrub willow species with the notable exception of felt-leaf willow, which is protected by dense hairs on lower leaf surfaces. The defoliation of willow caused by willow leafblotch miner accounted for over 20% of observed forest damage by area from 2000 to 2014. High severity defoliation (over half of willow within the damage polygon were defoliated) was observed in 45% of damaged area. The area of observed willow defoliation doubled every 5-year period from 2000 to 2014. From 2010 to 2014, approximately 40% of observed forest damage was caused by willow leafblotch miner. This may indicate that environmental conditions are becoming more favorable for willow leafblotch miner within the study area. Most of the defoliation caused by willow leafblotch miner in Alaska occurred within the CYR study area, although more sporadic, widely separated defoliation sites occurred throughout the state. Within the study area, defoliation was widespread except for in the western third of the study area and the southern Brooks Range. Kernel Density Estimation was performed using Geospatial Modeling Environment (GME) with points of aspen defoliation damage from 2000 to 2014. The raw kernel density output was interpolated as 5% quantiles of the kernel density values extracted to the original input points. This dataset provides a visualization of area and intensity of impact of aspen leafminer within Alaska from 2000 to 2014.

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Dates

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 -119.414438
Bbox North Lat 69.799426
Bbox South Lat 54.276828
Bbox West Long -172.499743
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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