Vegetation of the Angmagssalik District, Southeast Greenland, IV. Shrub, Dward Shrub and Terricolous Lichens PDF Download

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Publisher: Museum Tusculanum Press
ISBN: 9788763511476
Category :
Languages : en
Pages : 88

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Author: William A. Burnham
Publisher: Museum Tusculanum Press
ISBN: 9788763511629
Category : Science
Languages : en
Pages : 32

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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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Author: Jayne Belnap
Publisher: Springer Science & Business Media
ISBN: 3642564755
Category : Science
Languages : en
Pages : 496

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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.

Author: Bent Fredskild
Publisher: Museum Tusculanum Press
ISBN: 9788763512473
Category : Science
Languages : en
Pages : 88

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Author: R. E. Longton
Publisher: CUP Archive
ISBN: 9780521250153
Category : Nature
Languages : en
Pages : 406

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Considers the evolution and adaptions of arctic and antarctic floras and the role of these plants in the vegetation and in the functioning of tundra ecosystems.

Author: Mark Nuttall
Publisher: Routledge
ISBN: 1136786805
Category : Reference
Languages : en
Pages : 2306

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With detailed essays on the Arctic's environment, wildlife, climate, history, exploration, resources, economics, politics, indigenous cultures and languages, conservation initiatives and more, this Encyclopedia is the only major work and comprehensive reference on this vast, complex, changing, and increasingly important part of the globe. Including 305 maps. This Encyclopedia is not only an interdisciplinary work of reference for all those involved in teaching or researching Arctic issues, but a fascinating and comprehensive resource for residents of the Arctic, and all those concerned with global environmental issues, sustainability, science, and human interactions with the environment.

Author: H. G. Jones
Publisher: Cambridge University Press
ISBN: 9780521584838
Category : Nature
Languages : en
Pages : 272

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A multidisciplinary 2001 overview of life in, on and under snow for anyone interested in the cryosphere.

Author: Patrick Matagne
Publisher: John Wiley & Sons
ISBN: 1394276680
Category : Science
Languages : en
Pages : 356

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This book presents a biography of the Danish botanist Eugen Warming. As the author of a treatise on ecology that brought him international recognition, he was able to inspire the first generation of 20th-century European and American ecologists. His innovative approach to nature and his Arctic and tropical missions heralded the birth of a new science and an ecological awareness. As a professor at several Scandinavian universities during a period of intense debate and controversy over evolutionary theories, Eugen Warming vigorously asserted his convictions. Birth of Scientific Ecology presents the image of a man of knowledge and power, recognized by his contemporaries as a founder of ecology and a player in the ecological project of the Kingdom of Denmark at a time when the empires were clashing.

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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