A Phytogeographical Study of the Vascular Plants of Norther Greenland - North of 74 Northern Latitude PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Phytogeographical Study of the Vascular Plants of Norther Greenland - North of 74 Northern Latitude PDF full book. Access full book title A Phytogeographical Study of the Vascular Plants of Norther Greenland - North of 74 Northern Latitude by Christian Bay. Download full books in PDF and EPUB format.
Author: Christian Bay
Publisher: Museum Tusculanum Press
ISBN: 9788763512176
Category : Science
Languages : en
Pages : 108
Get Book Here
Book Description
.
Author: Christian Bay
Publisher: Museum Tusculanum Press
ISBN: 9788763512176
Category : Science
Languages : en
Pages : 108
Get Book Here
Book Description
.
Author: Birgit Sieg
Publisher: Museum Tusculanum Press
ISBN: 9788763512756
Category : Mountain plants
Languages : en
Pages : 100
Get Book Here
Book Description
Author: William A. Burnham
Publisher: Museum Tusculanum Press
ISBN: 9788763511629
Category : Science
Languages : en
Pages : 32
Get Book Here
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: Thomas A. Bender
Publisher:
ISBN:
Category : Climatology
Languages : en
Pages : 548
Get Book Here
Book Description
Arranged alphabetically within ten year groups.
Author: Fritz Hans Schwarzenbach
Publisher: Museum Tusculanum Press
ISBN: 9788763512503
Category : Science
Languages : en
Pages : 200
Get Book Here
Book Description
.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
Get Book Here
Book Description
Author: Sidney Fay Blake
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 348
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 338
Get Book Here
Book Description
Author: Laszlo Nagy
Publisher: Springer Science & Business Media
ISBN: 3642189679
Category : Science
Languages : en
Pages : 480
Get Book Here
Book Description
The United Nations Conference on the Environment and Development (UNCED), held in Rio de Janeiro in 1992, spawned a multitude of pro grammes aimed at assessing, managing and conserving the earth's biological diversity. One important issue addressed at the conference was the mountain environment. A specific feature of high mountains is the so-called alpine zone, i. e. the treeless regions at the uppermost reaches. Though covering only a very small proportion of the land surface, the alpine zone contains a rela tively large number of plants, animals, fungi and microbes which are specifi cally adapted to cold environments. This zone contributes fundamentally to the planet's biodiversity and provides many resources for mountain dwelling as well as lowland people. However, rapid and largely man-made changes are affecting mountain ecosystems, such as soil erosion, losses of habitat and genetic diversity, and climate change, all of which have to be addressed. As stated in the European Community Biodiversity Strategy, "the global scale of biodiversity reduction or losses and the interdependence of different species and ecosystems across national borders demands concerted international action". Managing biodiversity in a rational and sustainable way needs basic knowledge on its qualitative and quantitative aspects at local, regional and global scales. This is particularly true for mountains, which are distributed throughout the world and are indeed hot spots of biodiversity in absolute terms as well as relative to the surrounding lowlands.
Author: Bent Fredskild
Publisher: Museum Tusculanum Press
ISBN: 9788763512350
Category : Science
Languages : en
Pages : 164
Get Book Here
Book Description
Phytogeographically and climatically West Greenland includes parts of the low arctic and high arctic areas. The present vegetation and a summary of its history since the last glaciation based on pollen and macrofossil analyses are briefly described. The determination of more than 55,000 herbarium sheets of native phanerogams has been checked. Before preparing the dot maps it was necessary to decide at which level taxonomically difficult genera (eg: Antennaria, Draba, Poa, Puccinellia, and Stellaria would be treated). For all of these the criteria used are given. Dot maps have been prepared for 379 taxa. These maps have been grouped into 11 West Greenland distribution types, which clearly correlate with T W Böcher's biological distribution types (Böcher 1963). The collecting intensity in the large area is rather uneven. This is illustrated by a map giving the number of collections at the 305 localities from which 50 or more collections are at hand. Another map giving the number of taxa at 29 well-investigated localities illustrates the species diversity in the region. Most low arctic localities have more than 130 taxa, with 215 at the richest locality (Godhavn / Qeqertarsuaq on Disko), while the number at no high arctic locality exceeds lS0. Reference to the corresponding numbers in other parts of Greenland is given. Based on the dot maps a new delimitation of West Greenland in floristic provinces and districts is presented. It differs somewhat from that in Grønlands Flora / The Flora of Greenland (Böcher et al. 1957, and later editions). The major alteration is that the boundary between the low and high arctic phytogeographic provinces is now placed through north Disko - Nuussuaq. As a consequence of this the southernmost district in the high arctic is divided into an outer (NWso) and an inner province (NWsi). Minor alterations are suggested in the southern part of West Greenland.
