نتایج جستجو برای: black forest horses

تعداد نتایج: 258148  

2000
E. Todd Manning

............................................................................................................................................... iii Acknowledgements ......................................................................................................................... iv . Introduction ..............................................................................................

Journal: :Proceedings. Biological sciences 2010
Gábor Horváth Miklós Blahó György Kriska Ramón Hegedüs Balázs Gerics Róbert Farkas Susanne Akesson

White horses frequently suffer from malign skin cancer and visual deficiencies owing to their high sensitivity to the ultraviolet solar radiation. Furthermore, in the wild, white horses suffer a larger predation risk than dark individuals because they can more easily be detected. In spite of their greater vulnerability, white horses have been highly appreciated for centuries owing to their natu...

Journal: :Science 2008
David A Wardle Marie-Charlotte Nilsson Olle Zackrisson

Fire is a global driver of carbon storage and converts a substantial proportion of plant biomass to black carbon (for example, charcoal), which remains in the soil for thousands of years. Black carbon is therefore often proposed as an important long-term sink of soil carbon. We ran a 10-year experiment in each of three boreal forest stands to show that fire-derived charcoal promotes loss of for...

2017
Ok-Deuk Kang Yong-Soo Park

BACKGROUND This study aimed to analyze the on heart rate, blood lactate concentration, packed cell volume (PCV) and hemoglobin (Hb) response after conducting exercise in endurance horses. METHODS A total of 20 healthy 3-9-years-old Jeju crossbreed mares (5.95 ± 2.24 year) of age and 312.65 ± 13.59 kg of weight) currently participating the endurance competition were used. The field tests selec...

درویشی, آصف, سفیانیان, علیرضا , فاخران, سیما , قربانی, مهدی ,

Large scale land use/cover changes and habitat fragmentation have been associated with the decline of many wildlife populations in ecological sensitive regions. The main goal of this study was to quantify the spatial pattern changes in Caucasian Black Grouse habitat in Arasbaran Biosphere Reserve, Northwest of Iran in a period of 24 years (1987–2011). Caucasian black grouse (Tetrao mlokosiewicz...

2002
T. S. RUPP A. M. STARFIELD

In the boreal biome, fire is the major disturbance agent affecting ecosystem change, and fire dynamics will likely change in response to climatic warming. We modified a spatially explicit model of Alaskan subarctic treeline dynamics (ALFRESCO) to simulate boreal vegetation dynamics in interior Alaska. The model is used to investigate the role of black spruce ecosystems in the fire regime of int...

2005
S. D. Chambers J. Beringer J. T. Randerson S. Chapin

[1] The net radiation available to drive surface-atmosphere exchange is strongly influenced by albedo and surface temperature. Tower-based microclimatic and eddy covariance measurements in typical Alaskan black spruce and tundra ecosystems before and immediately after fire indicated a 10% decrease in net radiation over the burned spruce stand but a 12% increase in net radiation over the burned ...

2017
Sandra R Holden Brendan M Rogers Kathleen K Treseder Michael Alonzo Douglas C Morton Bruce D Cook Hans-Erik Andersen Chad Babcock Robert Pattison

Fire in the boreal region is the dominant agent of forest disturbance with direct impacts on ecosystem structure, carbon cycling, and global climate. Global and biome-scale impacts are mediated by burn severity, measured as loss of forest canopy and consumption of the soil organic layer. To date, knowledge of the spatial variability in burn severity has been limited by sparse field sampling and...

Journal: :Ecological applications : a publication of the Ecological Society of America 2007
Martin Simard Nicolas Lecomte Yves Bergeron Pierre Y Bernier David Paré

Long-term forest productivity decline in boreal forests has been extensively studied in the last decades, yet its causes are still unclear. Soil conditions associated with soil organic matter accumulation are thought to be responsible for site productivity decline. The objectives of this study were to determine if paludification of boreal soils resulted in reduced forest productivity, and to id...

2011
Julio López Hernandez Colin Degraf Tiziana DiMatteo Bin Fu Eugene Fink Garth A. Gibson

Large-scale N-body simulations play an important role in advancing our understanding of the formation and evolution of large structures in the universe. These computations require a large number of particles, in the order of 10-100 of billions, to realistically model phenomena such as the formation of galaxies. Among these particles, black holes play a dominant role on the formation of these st...

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