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Janet Prevéy, Ph.D.

Janet Prevéy is an ecologist at the Fort Collins Science Center, whose research focuses on how environmental changes affect phenology across different spatial and temporal scales.

My research focuses on phenology, the study of seasonal biological events. I utilize information from reciprocal transplant studies, manipulative experiments, community scientists, satellite imagery, and long-term monitoring plots to explore how environmental changes affect phenology across different spatial and temporal scales. I seek to understand how climatic conditions, genetic adaptations, and biotic interactions can differentially influence species’ phenological responses, and how these differences can ultimately determine community and ecosystem responses to environmental change.

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A brown, woven basket full of tiny blue hucklberries sits on top of a wood-weaved mat on a ground of grey stones.

Climate Impacts on the Locations and Availability of Traditional Food Sources from Native Northwestern Shrubs

Fruit-producing shrubs such as huckleberries, salal, and hazelnut are an important component of social history and traditional tribal diets in the Pacific Northwest. The fruits of these shrubs are also an important food source for foraging wildlife and pollinators, and serve as the basis for both non-tribal harvesting and small-scale commercial operations. Among land managers and tribes, there is
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Climate Adaptation Science Centers
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Climate Impacts on the Locations and Availability of Traditional Food Sources from Native Northwestern Shrubs

Fruit-producing shrubs such as huckleberries, salal, and hazelnut are an important component of social history and traditional tribal diets in the Pacific Northwest. The fruits of these shrubs are also an important food source for foraging wildlife and pollinators, and serve as the basis for both non-tribal harvesting and small-scale commercial operations. Among land managers and tribes, there is
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INHABIT species potential distribution across the contiguous United States (ver. 3.0, February 2023)

We developed habitat suitability models for invasive plant species selected by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly customized models for a few species versus fitting non-specific and generic models for numer
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Fort Collins Science Center

Habitat suitability models for understory shrubs of western North America

These data provide current and future projected habitat distribution models for four shrub species: beaked hazelnut (Corylus cornuta), Oregon grape (Mahonia aquifolium), salal (Gaultheria shallon), and black huckleberry, (Vaccinium membranaceum), as well as a current projected habitat distribution model for evergreen huckleberry (Vaccinium ovatum). Each raster file represents the projected habitat
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Fort Collins Science Center

Location and phenology observations for beaked hazelnut (Corylus cornuta), Oregon grape (Mahonia aquifolium), and salal (Gaultheria shallon) in western North America

These data provide the locations and phenological dates of three shrub species: beaked hazelnut (Corylus cornuta), Oregon grape (Mahonia aquifolium), and salal (Gaultheria shallon), collected from various publicly available data sources including data from USFS Forest Inventory and Analysis program, USFS R-6 Ecology Program, US National Park Service, USDI Bureau of Land Management, USA National Ph
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Fort Collins Science Center

Invaders at the doorstep: Using species distribution modeling to enhance invasive plant watch lists

Watch lists of invasive species that threaten a particular land management unit are useful tools because they can draw attention to invasive species at the very early stages of invasion when early detection and rapid response efforts are often most successful. However, watch lists typically rely on the subjective selection of invasive species by experts or on the use of spotty occurrence records.
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Ecosystems Mission Area, Science Analytics and Synthesis (SAS) Program, Fort Collins Science Center

Editorial: Plant phenology shifts and their ecological and climatic consequences

Climate change is causing plant phenology to shift, with consequences for ecosystems and the Earth’s climate. Over the last decades, the timing of many important phenological events has advanced in spring, such as leaf emergence and flowering, or been delayed in fall, such as leaf coloration and leaf fall. The consequences of such phenological shifts are still largely unknown, but are hypothesized
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Ecosystems Mission Area, Fort Collins Science Center

Higher temperature sensitivity of flowering than leaf-out alters the time between phenophases across temperate tree species

AimThe aims of this study were to evaluate the changes in the length of the time period between leaf-out and flowering across temperate tree species, and associate these changes with potential physiological and environmental drivers to enhance mechanistic insight into these phenomena.LocationCentral Europe.Time period1980–2016.Major taxa studiedSix temperate woody species.MethodsStatistical analys
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Ecosystems Mission Area, Fort Collins Science Center

INHABIT: A web-based decision support tool for invasive plant species habitat visualization and assessment across the contiguous United States

Narrowing the communication and knowledge gap between producers and users of scientific data is a longstanding problem in ecological conservation and land management. Decision support tools (DSTs), including websites or interactive web applications, provide platforms that can help bridge this gap. DSTs can most effectively disseminate and translate research results when producers and users collabo
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Ecosystems Mission Area, Fort Collins Science Center

Effects of variable-density thinning on non-native understory plants in coniferous forests of the Pacific Northwest

Old-growth forests serve as critical habitat for many sensitive species, but management practices have diminished their prevalence, and former regions of old-growth are now dominated by second-growth stands lacking the structural heterogeneity, diversity, and species richness that these older forests possess. In western Washington state in the Pacific Northwest of the United States, the Olympic Ha
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Ecosystems Mission Area, Fort Collins Science Center

Predicted distribution of a rare and understudied forest carnivore: Humboldt marten (Martes caurina humboldtensis)

Many mammalian species have experienced range contractions. Following a reduction in distribution that has resulted in apparently small and disjunct populations, the Humboldt marten (Martes caurina humboldtensis) was recently designated as federally Threatened and state Endangered. This subspecies of Pacific marten occurring in coastal Oregon and northern California, also known as coastal martens,
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Ecosystems Mission Area, Fort Collins Science Center

Experimental warming differentially affects vegetative and reproductive phenology of tundra plants

Rapid climate warming is altering Arctic and alpine tundra ecosystem structure and function, including shifts in plant phenology. While the advancement of green up and flowering are well-documented, it remains unclear whether all phenophases, particularly those later in the season, will shift in unison or respond divergently to warming. Here, we present the largest synthesis to our knowledge of ex
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Ecosystems Mission Area, Fort Collins Science Center

The tundra phenology database: More than two decades of tundra phenology responses to climate change

Observations of changes in phenology have provided some of the strongest signals of the effects of climate change on terrestrial ecosystems. The International Tundra Experiment (ITEX), initiated in the early 1990s, established a common protocol to measure plant phenology in tundra study areas across the globe. Today, this valuable collection of phenology measurements depicts the responses of plant
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Ecosystems Mission Area, Fort Collins Science Center

Developing common protocols to measure tundra herbivory across spatial scales

Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot and site-level protocols
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Ecosystems Mission Area, Fort Collins Science Center

Projected impacts of climate change on the range and phenology of three culturally-important shrub species

Climate change is shifting both the habitat suitability and the timing of critical biological events, such as flowering and fruiting, for plant species across the globe. Here, we ask how both the distribution and phenology of three food-producing shrubs native to northwestern North America might shift as the climate changes. To address this question, we compared gridded climate data with species l
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Ecosystems Mission Area, Fort Collins Science Center

Global plant trait relationships extend to the climatic extremes of the tundra biome

The majority of variation in six traits critical to the growth, survival and reproduction of global plant species is thought to be organised along just two dimensions, corresponding to strategies of plant size and resource acquisition. However, it is unknown whether global plant trait relationships extend to climatic extremes, and if these interspecific relationships are confounded by trait variat
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Ecosystems Mission Area, Fort Collins Science Center

Climate change: Flowering time may be shifting in surprising ways

Climate change is known to affect regional weather patterns and phenology; however, we lack under-standing of how climate drives phenological change across local spatial gradients. This spatial variation is critical for determining whether subpopulations and metacommunities are changing in unison or diverging in phenology. Divergent responses could reduce synchrony both within species (disrupting
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Ecosystems Mission Area, Fort Collins Science Center
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Fort Collins Science Center Scientists Share Expertise at Society for Range Management Meeting

Scientists from the US Geological Survey Fort Collins Science Center will be presenting on topics ranging from sage-grouse to invasive plant species...

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