Filters: Tags: ecosystem disturbance (X)4 results (67ms)
This layer depicts the status, or degree of disturbance, to plant communities on the main Hawaiian Islands. To more precisely identify areas where native species may presently be found, a map was generated that considers the following three categories of habitat quality: High, areas dominated by native vegetation; Medium, areas dominated by nonnative vegetation; and Low, highly modified landscapes. The primary source for mapping these three categories is the HIGAP land-cover classification (Gon, 2006). The High category includes all HIGAP land-cover classes that are considered to be either native dominated or mixed native and nonnative in order to represent those areas that have substantial native-species composition....
Soil surface properties and roughness data at two experimental restoration sites within the Southwestern USA
This data release presents data used for analyzing spatial and temporal differences in soil surface roughness within selected biocrust communities. These records were collected by ground-based lidar for 121, 1m x 3m soil plots with biological soil crusts (biocrusts). Roughness was estimated from 5 mm resolution data (CloudCompare v. 2.10.2, 2019) for two Great Basin Desert sites (UTTR-1; UTTR-2) in December 2015 and one Chihuahuan Desert site (JER) in February 2016. Data were again collected in June 2018 for UTTR-1 and UTTR-2. Additional field and laboratory data were included within this study to understand differences in soil surface roughness between UTTR and JER as well as between the 2016 and 2018 surveys at...
Fire Refugia in Old-Growth Forests: Predicting Habitat Persistence to Support Land Management in an Era of Rapid Global Change
Mature, old-growth forests in the Pacific Northwest provide critical habitat for threatened and endangered species, including the northern spotted owl and marbled murrelet. Dominated by large Douglas-firs and western hemlocks, these established forests range in age from 200 to 1,000 years old. Yet wildfire activity is increasing across western North America, heightening concerns about severe fires that have the potential to kill the upper canopy layer of forests. Known as “stand-replacing fires”, these extreme events have important implications for forest ecosystems, initiating forest regrowth and altering habitat for wildlife. Identifying locations that are protected from stand-replacing fire is an urgent management...
***This data product has been SUPERSEDED by Duda, J.J., Johnson, R.C., Wieferich, D.J., Wagner, W.J., and Bellmore, J.R., 2020, USGS Dam Removal Science Database v3.0 (ver. 3.0, January 2020): U.S. Geological Survey data release, https://doi.org/10.5066/P9IGEC9G.***