Management of forests and forest carnivores: Relating landscape mosaics to habitat quality of Canada lynx at their range periphery

Holbrook, Joseph D.; Squires, John R.; Bollenbacher, Barry; Graham, Russ; Olson, Lucretia E.; Hanvey, Gary; Jackson, Scott M.; Lawrence, Rick L.; Savage, Shannon L.

doi:10.1016/j.foreco.2019.01.011

Cited by 21 publications

(10 citation statements)

References 54 publications

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“…We used the adaptive LoCoH function in the R package T-LoCoH [29], and calculated 95% isopleths for animals with >25 locations. This method has proven to be superior to more traditional home range estimation techniques, such as minimum convex polygon or fixed kernel analysis, when dealing with animals that have distinct territorial boundaries, are sensitive to edge habitat, or when the data includes a variety of monitoring methods [30,31]. Location data used included aerial, ground, and GPS telemetry, as well as rest and den sites.…”

Section: Overlap Of Grow-site Likelihood With Species Of Concernmentioning

confidence: 99%

Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon

Wengert¹,

Higley²,

Gabriel³

et al. 2021

PLoS ONE

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Illegal cannabis cultivation on public lands has emerged as a major threat to wildlife in California and southern Oregon due to the rampant use of pesticides, habitat destruction, and water diversions associated with trespass grow sites. The spatial distribution of cultivation sites, and the factors influencing where they are placed, remain largely unknown due to covert siting practices and limited surveillance funding. We obtained cannabis grow-site locality data from law enforcement agencies and used them to model the potential distribution of cultivation sites in forested regions of California and southern Oregon using maximum entropy (MaxEnt) methods. We mapped the likely distribution of trespass cannabis cultivation sites and identified environmental variables influencing where growers establish their plots to better understand the cumulative impacts of trespass cannabis cultivation on wildlife. We overlaid the resulting grow-site risk maps with habitat distribution maps for three forest species of conservation concern: Pacific fisher (Pekania pennanti), Humboldt marten (Martes caurina humboldtensis), and northern spotted owl (Strix occidentalis caurina). Results indicate that cannabis cultivation is fairly predictably distributed on public lands in low to mid-elevation (~800-1600m) forests and on moderate slopes (~30–60%). Somewhat paradoxically, results also suggest that growers either preferred sites inside of recently disturbed vegetation (especially those burned 8–12 years prior to cultivation) or well outside (>500m) of recent disturbance, perhaps indicating avoidance of open edges. We ground-truthed the model by surveying randomly selected stream courses for cultivation site presence in subsets of the modeling region and found previously undiscovered sites mostly within areas with predicted high likelihood of grow-site occurrence. Moderate to high-likelihood areas of trespass cultivation overlapped with 40 to 48% of modeled habitats of the three sensitive species. For the endangered southern Sierra Nevada fisher population, moderate-high likelihood growing areas overlapped with over 37% of modeled fisher denning habitat and with 100% of annual female fisher home ranges (mean overlap = 48.0% + 27.0 SD; n = 134) in two intensively studied populations on the Sierra National Forest. Locating and reclaiming contaminated cannabis grow sites by removing all environmental contaminants should be a high priority for resource managers.

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Section: Overlap Of Grow-site Likelihood With Species Of Concernmentioning

confidence: 99%

Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon

Wengert¹,

Higley²,

Gabriel³

et al. 2021

PLoS ONE

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“…The recorded data prove that Canada lynxes respond to the cyclic rise-and-fall in snowshoe hare populations over the years in Alaska and central Canada. The conservation law would help investigate fundamental relations among environmental problems and forests occupied with threatened and endangered species [59].…”

Section: The 10-year Population Cycles Of Lynx and Hare In 200-year Data And The Purpose Of Nonlinear Analysis On Ecologymentioning

confidence: 99%

The Lynx and Hare Data of 200 Years as the Nonlinear Conserving Interaction Based on Noether’s Conservation Laws and Stability

Uechi¹,

Uechi²,

Uechi³

2021

JAMP

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“…Silviculture is, therefore, a powerful tool to achieve wildlife management aims. Creating and manipulating disturbance regimes of forests can enhance the spatial and temporal arrangement of key forest characteristics used or selected by a given wildlife species and can therefore improve quality of the species' habitat [15]. This is especially true for the small or threatened wildlife populations in greatest need of active management interventions, and of which the long-term effective conservation rests on structural improvements of their habitat at the landscape scale [5].…”

Section: Introductionmentioning

confidence: 99%

Assessing Forest Structural and Topographic Effects on Habitat Productivity for the Endangered Apennine Brown Bear

Rositi¹,

Lasinio²,

Ciucci³

2021

Forests

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Any forest management potentially affects the availability and quality of resources for forest-dwelling wildlife populations, including endangered species. One such species is the Apennine brown bear, a small and unique population living in the central Apennines of Italy. The conservation of this relict bear population is hampered by the lack of knowledge of the fine-scale relationships between productivity of key foods and forest structure, as this prevents the design and implementation of effective forest management plans. To address this issue, we sampled the main structural stand attributes within the bear’s range and used multivariate generalized linear mixed models in a Bayesian framework to relate forest structural attributes to proxies of productivity of key bear foods. We found that hard mast was positively associated with both forest typology and high forest system, but negatively related to both the time elapsed since the last forest utilization and the amount of deadwood. The availability of soft-mast producing species was positively related to past forestry practices but negatively associated with steep slopes historically managed with high tree densities and a low silvicultural disturbance. Our findings also suggest that herb cover was negatively affected by terrain steepness and basal area, while herb productivity was positively affected by northern and southern exposure. Additionally, richness of forest ants was associated with forests characterized by low volume and high density. Our findings confirm that the productivity of natural bear foods is strongly affected by forest structural and topographical characteristics and are relevant as preliminary information for forest management practices to support the long-term conservation of Apennine bears.

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Management of forests and forest carnivores: Relating landscape mosaics to habitat quality of Canada lynx at their range periphery

Cited by 21 publications

References 54 publications

Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon

Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon

The Lynx and Hare Data of 200 Years as the Nonlinear Conserving Interaction Based on Noether’s Conservation Laws and Stability

Assessing Forest Structural and Topographic Effects on Habitat Productivity for the Endangered Apennine Brown Bear

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