Northern Foshawk Accipiter Gentilis Habitat Characterization In Central Alberta
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Northern Foshawk Accipiter Gentilis Habitat Characterization In Central Alberta
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Author : Warren Wesley Schaffer
language : en
Publisher:
Release Date : 1998
Northern Foshawk Accipiter Gentilis Habitat Characterization In Central Alberta written by Warren Wesley Schaffer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Northern Goshawk Accipiter Gentilis Habitat Characterization In Central Alberta
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Author :
language : en
Publisher:
Release Date : 1998
Northern Goshawk Accipiter Gentilis Habitat Characterization In Central Alberta written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Northern Goshawk Habitat Characterization In Central Alberta Item No Ftmf 17
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Author : Foothills Model Forest
language : en
Publisher:
Release Date : 1997
Northern Goshawk Habitat Characterization In Central Alberta Item No Ftmf 17 written by Foothills Model Forest and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Evaluation Of A Spatial Habitat Suitability Model For The Northern Goshawk Accipiter Gentilis In West Central Alberta Microform
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Author : Keith James Hautala
language : en
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
Release Date : 2004
Evaluation Of A Spatial Habitat Suitability Model For The Northern Goshawk Accipiter Gentilis In West Central Alberta Microform written by Keith James Hautala and has been published by Library and Archives Canada = Bibliothèque et Archives Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Goshawk categories.
The Goshawk
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Author : Robert Kenward
language : en
Publisher: A&C Black
Release Date : 2010-01-30
The Goshawk written by Robert Kenward and has been published by A&C Black this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-30 with Nature categories.
A large and spectacular bird of prey, the Goshawk lives in boreal forests throughout the Northern hemisphere. The Goshawk is an authoritative yet highly readable monograph of the species. A powerful hunter of large birds and woodland mammals, it was persecuted for many years by game keepers to the point of extinction in the UK. However, escaped falconry birds led to the establishment of a new population in the 1960s, though the species remains rare and elusive - birders need a combination of hard work and a little luck to see this magnificent raptor. The Goshawk includes chapters on nomenclature, races and morphs, biometrics, nesting, incubation and chick-rearing, migration, feeding ecology, population dynamics, and conservation, punctuated throughout with illuminating tales from author Robert Kenward's extensive field research. The book is packed with illustrations, figures and maps, and contains a selection of the author's superb photographs of the birds. The product of almost 30 years work, this title is a classic Poyser monograph; birders will enjoy the fascinating insights into the biology of the bird, while academics will appreciate the book's comprehensive literature review.
Multi Scale Analysis Of Northern Goshawk Accipiter Gentilis Breeding Habitat In New Hampshire
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Author :
language : en
Publisher:
Release Date : 2012
Multi Scale Analysis Of Northern Goshawk Accipiter Gentilis Breeding Habitat In New Hampshire written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Goshawk categories.
The Northern Goshawk In Utah
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Author : Russell T. Graham
language : en
Publisher:
Release Date : 1999
The Northern Goshawk In Utah written by Russell T. Graham and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Goshawk categories.
This assessment describes northern goshawk (Accipiter gentilis) habitat in the State of Utah. Because of fire exclusion, insect and disease epidemics, timber harvest, livestock grazing, or a combination of these factors the forests and woodlands of Utah have changed drastically since the early 1900's. Forests are now dominated by mid- and late successional species (Douglas-fir, white fir, and subalpine fir) rather than the early successional species (lodgepole and ponderosa pine). Along with these changes came suspected declines in goshawk populations. Goshawk habitat in Utah was assessed using potential vegetation types, current vegetation types, and expert knowledge. Subalpine fir (17 percent) and quaking aspen (10 percent) potential vegetation types were the most common forest types in the State. Nearly 95 percent of the subalpine fir potential vegetation type was rated as high or medium for nesting habitat, while nearly 90 percent of the quaking aspen potential vegetation type was rated as high or medium for nesting. Similarly, combining nesting and foraging preferences 70 percent of the subalpine fir potential vegetation type is rated as either high value or optimum habitat. In addition, throughout Utah all of the high value habitats are well connected. The present conditions of the forests and woodlands of Utah are prone to insect and disease epidemics in addition to the risk of stand replacing fires. To ensure the goshawk's continued existence in Utah will require the restoration of these degraded habitats and the protection of native processes.
Northern Goshawk Habitat Suitability And Monitoring Plan
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Author : Ian Gardner
language : en
Publisher:
Release Date : 2016
Northern Goshawk Habitat Suitability And Monitoring Plan written by Ian Gardner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The Northern Goshawk (Accipiter gentilis) is an umbrella species of large mature forests in the northeastern United States and has recently shown a breeding population decline. It has been declared Vulnerable in Pennsylvania, Critically Imperiled in West Virginia and Maryland, and Extirpated in Virginia. While much of the natural history and habitat preferences of this species is known, the breeding distribution and regional population size is not. I identified two objectives to determine those unknowns: 1) Create a habitat suitability model for Northern Goshawk in Pennsylvania, West Virginia, Maryland, and Virginia; 2) Develop a monitoring plan and define conservation guidelines for Northern Goshawk in the region. The entire study is based on a 600-hectare grid network of sampling units that was overlain on the region. Confirmed nest locations from 1980 to 2013 were compiled. Sampling units that intersected a 600-hectare buffer around the nest points were categorized as being occupied (1) and all others as unoccupied (0). A habitat envelope was created to constrain the study to only potential habitat using a threshold of 40% forest canopy cover. Sampling units with an average canopy cover less than 40% were labeled as non-habitat and removed from the analysis. The following predictor covariates were averaged for each sampling unit: canopy bulk density , canopy height , canopy cover, dominant forest group, edge/core forest proportion, elevation, slope, annual precipitation, maximum temperature. These covariates represent forest habitat, topography, and climate parameters. Because the study area is so large, it was divided by level III ecoregions and tested using a Multiple Comparisons of Means Tukey Test to compare habitat preferences of goshawks in each ecoregion. Northern Goshawk habitat preferences for elevation, slope, annual precipitation, and maximum temperature were all significantly different between each ecoregion and substantiated splitting the study area into three ecoregions: Allegheny Plateau, Central Appalachians, and Ridge and Valley. Habitat suitability models for each ecoregion were then calculated using logistic regression between sampling unit occupation (1,0) and habitat covariates (forest, topography, and climate covariates). The top models were selected for each ecoregion by using AIC (Akaike Information Criterion) weights. The top Allegheny Plateau ecoregion model equation suggested Northern Goshawks prefer habitats with higher canopy bulk density (above-ground tree biomass), canopy cover, canopy height, and mean annual precipitation, a dominance of Northern hardwood tree species (maple/beech/birch forest group), lower elevation, slope, and mean temperature during breeding season, and less edge habitat based on significant covariates. The top Central Appalachians ecoregion model equation suggested Northern Goshawks prefer habitats with high canopy cover, elevation, and mean annual precipitation, a dominance of Northern hardwood tree species, and lower canopy bulk density, slope, and mean temperature during breeding season. The top Ridge and Valley ecoregion model equation suggested Northern Goshawks prefer habitats with higher canopy bulk density, canopy height, mean annual precipitation, a dominance of Northern hardwood tree species, and lower elevation, slope, and mean temperature during breeding season. Sampling units for each ecoregion were then ranked as primary or secondary using predicted probabilities. Much of the primary habitat coincided with state and federal land, which is generally managed as contiguous mature forest. Logistic regression should be used to revise the habitat suitability models every five years and include new occupation and habitat covariate data when available. A limited field season was used to test the breeding Northern Goshawk survey protocols established by Hargis and Woodbridge (2006). Playback-based field surveys were conducted in the Allegheny Plateau (Allegheny National Forest) and Ridge and Valley ecoregion (Rothrock, Moshannon, and Bald Eagle State Forests). Ten primary and ten secondary sampling units were randomly selected in each ecoregion within the public land boundaries. Surveys were conducted during the nestling (mid-May to mid-June) and fledgling (mid-June to mid-July) phases of goshawk development. 120 playback points were uniformly distributed along transects 250 meters apart in each sampling unit. Three-minute playbacks of goshawk territorial vocalizations were broadcast at each point. Due to poor weather and a limited number of surveyors, only 5 primary and 4 secondary sampling units were surveyed in Allegheny Plateau, and 7 primary and 6 secondary sampling units were surveyed in Ridge and Valley ecoregion. Surveys were only conducted once per sampling unit. Two Northern Goshawks were detected for 246 work-hours in the Allegheny Plateau surveys. One Northern Goshawk was detected for 393 work-hours in the Ridge and Valley surveys. Therefore, one goshawk was detected for every 213 work-hours within 22 sampling units surveyed. Because only one survey was conducted at each sampling unit, population estimates could not be calculated. Our limited surveys were constrained by lack of funding to employ additional survey personnel. To maximize use of funds and decrease the work-hours involved in detecting goshawks, a reduced protocol using 60 playbacks per sampling unit could be implemented. Simply reducing the number of playback points by half will drop the estimated 24-32 work-hours per sampling unit by three hours. The Pennsylvania Game Commission, U.S. Forest Service, PA Department of Conservation and Natural Resources, and MD Department of Natural Resources should use the following set of conservation guidelines for monitoring and conserving Northern Goshawk potential and established breeding habitat: 1) Revise the Habitat Suitability Model for the four-state region every 5 years using logistic regression with latest Northern Goshawk occurrences and any more accurate habitat parameters. 2) By 2026, targeted surveys should be conducted on public land with a concentration of primary sampling units and potential threats of forest fragmentation, such as those identified in Figure 13 for north central Pennsylvania. 3) Conduct further research on Broadcast Acoustical Survey protocol to determine if revised survey of reduced playback points is effective for determining frequency of occupation in sampling units. 4) Establish two concentric buffer zones around active or presumed active (within 10 years of activity) nest trees. No disturbances should be permitted within the 300-meter radius of the first buffer zone. Only limited disturbances, such as low-impact silvicultural practices, should be permitted within the 800-meter radius of the second buffer zone. Disturbances should be isolated to the non-breeding season (October February).
Breeding Ecology And Habitat Of Northern Goshawks Accipiter Gentilis Laingi On Vancouver Island
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Author : Thomas Joseph Ethier
language : en
Publisher:
Release Date : 1999
Breeding Ecology And Habitat Of Northern Goshawks Accipiter Gentilis Laingi On Vancouver Island written by Thomas Joseph Ethier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Goshawk categories.
Understanding Northern Goshawk Accipiter Gentilis Habitat And Behavior
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Author : Marilyn Wright
language : en
Publisher:
Release Date : 2017
Understanding Northern Goshawk Accipiter Gentilis Habitat And Behavior written by Marilyn Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Goshawk categories.