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Breeding And Wintering Areas Of Mallards Harvested In Various States And Provinces

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Author : Aelred D. Geis
Category : Duck shooting
Publisher :
Published : 1971
Type : PDF & EPUB
Page : 68
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Description: Band recoveries from mallards banded in breeding and wintering areas, weighted to reflect the population sizes the represent, were wintering areas to the harvest in each State and Province. Sources of population data in addtiion to conventional waterfowl breeding population surveys were utilized resulting in larger continent-wide population estimates than those previously published. The estimates of the relative importance of various breeding and wintering areas to the kill in each State and Province are presented in a series of tables. Patterins among States in the similarity or the dissimilarity in the source of harvest are mentioned.

Breeding And Wintering Areas Of Canvasbacks Harvested In Various States And Provinces

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Author : Aelred D. Geis
Category : Bird populations
Publisher :
Published : 1974
Type : PDF & EPUB
Page : 86
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Description: The relationships between canvasback (Aythya valisineria) breeding, wintering, and harvest areas were examined by analyzing banding data. Although canvasbacks wintering throughout North America come from the same general production areas, those wintering on the Pacific coast have a stronger relationship to western production areas, notably Alberta, than those wintering on the east coast, which come primarily from Manitoba and Saskatchewan. East and west coast wintering populations have different harvest patterns. The west coast population is harvested in relatively few areas, and the kill is more heavily concentrated on the wintering grounds. Canadian harvests of the west cost wintering populations are concentrated in Alberta, while those of the east coast wintering population are concentrated in Manitoba.

Habitat Management For Migrating And Wintering Waterfowl In North America

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Author : Loren M. Smith
Category : Nature
Publisher : Texas Tech University Press
Published : 1989
Type : PDF & EPUB
Page : 586
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Description: This important compilation on habitat management for waterfowl throughout North America addresses practicing waterfowl biologists and managers, researchers, and students of waterfowl ecology and management.

Management Of Wintering Bald Eagles

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Author : Karen Steenhof
Category : Accipitridae
Publisher :
Published : 1978
Type : PDF & EPUB
Page : 76
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Description:

Habitat Capability Model For Birds Wintering In The Black Hills South Dakota

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Author : Mark A. Rumble
Category : Birds
Publisher :
Published : 1999
Type : PDF & EPUB
Page : 20
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Description: Habitat models have considerable economic effects on management decisions and are used to predict consequences of land management decisions on wildlife. The Black Hills National Forest uses the habitat capability model (HABCAP), but its accuracy relative to resident wintering bird populations is largely unknown. We tested the model's predictive accuracy for resident nongame birds wintering in 11 vegetation structural stages of ponderosa pine, quaking aspen/paper birch, and meadows in the Black Hills, South Dakota. Six species, hairy woodpecker, gray jay, black-capped chickadee, white-breasted nuthatch, red-breasted nuthatch, and dark-eyed junco, had HABCAP coefficients for vegetation structural stages during winter. Red crossbills were not previously included in the model, so we developed HABCAP coefficients for them. Predicted abundance of winter birds in vegetation structural stages based on HABCAP coefficients differed from observed abundance for gray jays, black-capped chickadees, white-breasted nuthatches, red-breasted nuthatches, and dark-eyed juncos. HABCAP coefficients were modified to reflect observed abundance patterns of birds. These changes to HABCAP coefficients should provide managers with more appropriate estimates of land management impacts on nongame birds wintering in the Black Hills.

Concept Plan For Waterfowl Wintering Habitat Preservation

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Author : U.S. Fish and Wildlife Service. Region 1
Category : Water birds
Publisher :
Published : 1979
Type : PDF & EPUB
Page : 422
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Description:

Global Register Of Migratory Species

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Author : Klaus Riede
Category : Animal migration
Publisher :
Published : 2004
Type : PDF & EPUB
Page : 329
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Description:

Birds Of The Strait Of Gibraltar

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Author : Clive Finlayson
Category : Nature
Publisher : A&C Black
Published : 2010-09-30
Type : PDF & EPUB
Page : 560
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Description: The Strait of Gibraltar is famous as a major point of passage for Palaearctic birds migrating between their European breeding grounds and their winter quarters in Africa. Clive Finlayson, a native of the Rock and a trained ornithologist, presents a fascinating account of the region and its resident and transitory bird life. The first chapter of the book describes the area, which broadly defined includes the Coto Donana in the north and the Merja Zerga in the south, and the geographic and climatological characteristics which make it a suitable crossing place. In scope this book goes beyond the strict definition of the Strait and, following Irby's 19th Century work, examines the rich area where Europe meets Africa. The chapters which follow describe in detail the migration patterns of the principal passage species including their origins, destinations and overall numbers, showing how the precise conditions of weather and visibility affect the specific choice of route and timing of the crossing. The breeding and wintering bird communities are then considered and the ornithology of the entire region summarized. Whether or not you have ever witnessed the thousands of raptors, storks and other birds that may make this legendary crossing in a single day, this book will conjure the spirit of this extraordinary place. Delightful illustrations by lan Willis complete an important and entertaining book.

Quinby S New Bee Keeping

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Author : Moses Quinby
Category : Bees
Publisher :
Published : 1879
Type : PDF & EPUB
Page : 254
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Description:

Meddelelser Om Gr Nland

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Author :
Category : Geology
Publisher :
Published : 1942
Type : PDF & EPUB
Page : 490
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Description: