Filters: Contacts: {oldPartyId:3873} (X) > Extensions: Citation (X)
4 results (20ms)
Filters
Date Range
Types Contacts Categories |
Vegetation phenology and productivity play a crucial role in surface energy balance, plant and animal distribution, and animal movement and habitat use and can be measured with remote sensing metrics including start of season (SOS), peak instantaneous rate of green-up date (PIRGd), peak of season (POS), end of season (EOS), and integrated vegetation indices. However, for most metrics, we do not yet understand the agreement of remotely sensed data products with near-surface observations. We also need summaries of changes over time, spatial distribution, variability, and consistency in remote sensing dataset metrics for vegetation timing and quality. We compare metrics from 10 leading remote sensing datasets against...
Categories: Publication;
Types: Citation
Wildlife aggregation patterns can influence disease transmission. However, limited research evaluates the influence of anthropogenic and natural factors on aggregation. Many managers would like to reduce wildlife contact rates, driven by aggregation, to limit disease transmission. We develop a novel analytical framework to quantify how management activities such as supplemental feeding and hunting versus weather drive contact rates while accounting for correlated contacts. We apply the framework to the National Elk Refuge (NER), Wyoming, USA, where the probable arrival of chronic wasting disease (CWD) has magnified concerns. We used a daily proximity index to measure contact rates among 68 global positioning system...
Categories: Publication;
Types: Citation
Novel approaches for quantifying density and distributions could help biologists adaptively manage wildlife populations, particularly if methods are accurate, consistent, cost-effective, rapid, and sensitive to change. Such approaches may also improve research on interactions between density and processes of interest such as disease transmission across multiple populations. We assess how satellite imagery, unmanned aerial systems (UAS) imagery, and Global Positioning System (GPS) collar data vary in characterizing elk density, distribution and count patterns across times with and without supplemental feeding at the National Elk Refuge (NER), Wyoming, USA. We also present the first comparison of satellite imagery...
Categories: Publication;
Types: Citation
Ungulate populations across the West have adapted to specific patterns in forage quantity, quality, and timing that ultimately influence the number of animals. We assessed potential for climate change to affect forage quality and availability for ungulates in the West. First, we evaluated multiple satellite remote sensing datasets and found that in some parts of the western U.S., growing season dates have shifted by over 30 days. We found agreement in the direction of recent trends in growing season dates across ~60% of the West. Substantial shifts in vegetation timing can have outsized effects on the wildlife that depend on matching migration timing to spring green up. For example, migrating mule deer follow the...
|