Treesearch

Applying remote sensing models outside the temporal range of their training data, referred to as temporal model transfer, has become common practice for large area monitoring projects that extrapolate models for hindcasting or forecasting to time periods lacking reference data. However, the development of appropriate validation methods for temporal transfer has lagged behind its rapid adoption. Breaking temporal transfer’s assumption of temporal consistency in both remote sensing and reference data and their relationship to each other could lead to biased pixel-level predictions and small...

Context: Preserving functional connectivity is a conservation priority to secure the long-term viability of geographically dispersed subpopulations, such as the jaguar (Panthera onca) populations in Central America. However, managing connectivity in this region is limited due to the scarcity of local assessments of the connectivity between existing populations, some of which exhibit low levels of gene flow and genetic admixture.Objectives: We selected the jaguar as a model species to understand how gene flow of large carnivores is shaped in a heavily human-impacted landscape in the...

We know that we need bees to maintain healthy ecosystems. Pollinators help plants reproduce and flourish, and these plants, in turn, maintain soils and provide cover and food for animals. But what do bees need to survive, to thrive?

Reducing encroachment of pinyon-juniper woodlands is a proven management tool to restore sagebrush habitat for the greater sage grouse and other sagebrush-obligate species. However, these woodlands have their own obligate species, such as the pinyon jay whose population has seen significant declines over the decades. This places managers in a conundrum: where to prioritize conifer removal for sagebrush species without negatively impacting woodland species?

Premise: Herbivore pressure can vary across the range of a species, resulting in different defensive strategies. If herbivory is greater at lower latitudes, plants may be better defended there, potentially driving a latitudinal gradient in defense. However, relationships that manifest across the entire range of a species may be confounded by differences within genetic subpopulations, which may obscure the drivers of these latitudinal gradients.Methods: We grew plants of the widespread perennial grass Panicum virgatum in a common garden that included genotypes from three genetic subpopulatio...

1. A combination of forest thinning followed by prescribed burning is widely applied in the western United States to increase ecosystem resistance and resilience to disturbances. Understory plant community responses may be driven by both management treatments and climatic factors. Thus, responses to treatments during a 20-year megadrought have implications for the role of management in fostering adaptive capacity to climate change. 2. We used a network of five sites (600 plots) spanning an environmental gradient in ponderosa pine (Pinus ponderosa) forests of the American Southwest, an...

Wildland fire is a major global driver in the exchange of aerosols between terrestrial environments and the atmosphere. This exchange is commonly quantified using emission factors or the mass of a pollutant emitted per mass of fuel burned. However, emission factors for microbes aerosolized by fire have yet to be determined. Using bacterial cell concentrations collected on unmanned aircraft systems over forest fires in Utah, USA, we determine bacterial emission factors (BEFs) for the first time. We estimate that 1.39 × 1010 and 7.68 × 1011 microbes are emitted for each Mg of biomass...

With increasing outdoor recreation participation in the U.S., managers face the challenge of balancing visitor experiences with the protection of natural resources. To address declining management capacity, agencies seek to involve both new and established recreationists in local stewardship behaviors. However, community involvement in stewardship efforts is hindered by a lack of understanding of the connection between recreationists’ antecedent conditions and their behavioral intentions. This study focuses on a wildland recreation setting near a western U.S. city to examine the relationshi...

Invasions by non-native plant species after fire can negatively affect important ecosystem services and lead to invasion-fire cycles that further degrade ecosystems. The relationship between fire and plant invasion is complex, and the risk of invasion varies greatly between functional types and across geographic scales. Here, we examined patterns and predictors of non-native plant invasion following fire across the western United States. We specifically analyzed how the abundance of nonnative plants after fire was related to fire characteristics and environmental conditions, such as...

Homeowner wildfire risk mitigation and preparedness are important components of community wildfire readiness. This report presents data collected via rapid wildfire risk assessments to describe the parcel-level wildfire risk of properties within the Stemilt basin, Chelan County, Washington study area. The report also describes household survey data collected from homeowners in the study area, including their perspectives on wildfire risk, outreach preferences, mitigation and preparedness activities, and perceptions of community risk reduction strategies. Results may inform the wildfire...