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Author:
Publisher: Museum Tusculanum Press
ISBN: 9788763511513
Category :
Languages : en
Pages : 40
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Book Description
Author:
Publisher: Museum Tusculanum Press
ISBN: 9788763511513
Category :
Languages : en
Pages : 40
Get Book Here
Book Description
Author:
Publisher: Museum Tusculanum Press
ISBN: 9788763511827
Category :
Languages : en
Pages : 36
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Book Description
Author: John Walter Thomson
Publisher: Univ of Wisconsin Press
ISBN: 9780299134600
Category : Nature
Languages : en
Pages : 696
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Book Description
Lists a total of 965 species in 168 genera in the two volumes, describing the species including distribution maps covering Alaska, Canada, Greenland and Iceland. Includes an overview of the geology, climate, geography and ecology of the American arctic.
Author: Eric Steen Hansen
Publisher:
ISBN:
Category : Lichens
Languages : en
Pages : 136
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Book Description
Author: William A. Burnham
Publisher: Museum Tusculanum Press
ISBN: 9788763511629
Category : Science
Languages : en
Pages : 32
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Book Description
A ten year study began in 1972 in West Greenland to investigate the breeding biology of the peregrine falcon. Data on nesting gyrfalcons were also collected. Thirty-four peregrine nesting sites were examined in the 6050 km2 inland study area near Søndre Strømfjord. Limited research also centered in Disko Bugt and Frederikshåb. Peregrines were found nesting predominantly on high, south-facing cliffs, which overlooked large areas. The mean minimum distance between peregrine eyries was 7.7 km for the inland area (1972 and 1973) and 55 km for the coast (1974). Approximately 60 percent of the inland nesting sites were occupied each year. A ten-year average production of 1.90 young per occupied site and 2.78 young per successful site was determined. Lapland longspurs, snow buntings, wheatears, and redpolls comprised 90 percent of the peregrines diet. Raven nests and prey availability may be the most significant factor affecting falcon density. Addled peregrine eggs, eggshell fragments, and peregrine prey species were collected. Whole eggs averaged 14.3 ppm wet weight (305 ppm lipid weight ) DDE, while eggshell measurements showed a 16 percent thinning compared with pre-1940 eggs from Greenland. Prey species carried low levels of DDE. The peregrine population appears to be at a near critical contamination level, and a small increase in DDE level could contribute to a population decline. No indication of a decline has been observed during the study, and the population appears stable. The project banded 185 peregrines, from which 8 recoveries occurred. The recoveries suggest peregrines migrate south to winter in South America.
Author:
Publisher: Museum Tusculanum Press
ISBN: 9788763511544
Category :
Languages : en
Pages : 28
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Book Description
Author:
Publisher: Museum Tusculanum Press
ISBN: 9788763511476
Category :
Languages : en
Pages : 88
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Book Description
Author: John Walter Thomson
Publisher: Columbia University Press
ISBN: 9780231058889
Category : Computers
Languages : en
Pages : 532
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Book Description
Lists a total of 965 species in 168 genera in the two volumes, describing the species including distribution maps covering Alaska, Canada, Greenland and Iceland. Includes an overview of the geology, climate, geography and ecology of the American arctic.
Author: Ole G.. Norden Andersen
Publisher: Museum Tusculanum Press
ISBN: 9788763511599
Category : Jørgen Brønlund Fjord, North Greenland
Languages : en
Pages : 32
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Book Description
Author: Jayne Belnap
Publisher: Springer Science & Business Media
ISBN: 3642564755
Category : Science
Languages : en
Pages : 496
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Book Description
In arid lands, where vegetation is sparse or absent, the open ground is not bare but generally covered by a community of small, highly specialized organisms. Cyanobacteria, algae, microfungi, lichens, and bryophytes aggregate soil particles to form a coherent skin - the biological soil crust. It stabilizes and protects the soil surface from erosion by wind and water, influences water runoff and infiltration, and contributes nitrogen and carbon to desert soils. Soil surface disturbance, such as heavy livestock grazing, human trampling or off-road vehicles, breaks up the fragile soil crust, thus compromising its stability, structure, and productivity. This book is the first synthesis of the biology of soil crusts and their importance as an ecosystem component. Composition and functioning of different soil-crust types are discussed, and case studies are used to show the impact of crusts on landscape hydrology, soil stability, nutrient cycles, and land management.
