منابع مشابه
Influences of large-scale climatic variability on reindeer population dynamics: implications for reindeer husbandry in Norway
There is increasing evidence that the globe is currently warming, with changes being more pronounced in northern latitudes. Understanding the ecological effects of climatic variability is therefore important. There is recent support for the idea that a large-scale atmospheric phenomenon, the North Atlantic Oscillation (NAO), through its effects on vegetation and regional weather conditions, inf...
متن کاملSuicidal expressions among the Swedish reindeer-herding Sami population
Aims: The objective of this study was to investigate suicidal expressions among reindeer-herding Sami in Sweden. Subjects: A total of 315 reindeer-herding Sami (167 men, 148 women) were compared with geographically matched reference populations comprising 1354 persons (652 men, 702 women). Methods: A questionnaire measuring different aspects of suicidal behaviour, such as exposure to suicide an...
متن کاملPopulation Biology of Aging in the Wild
Empirical studies reveal aging occurs in wild populations. Consideration of the ecological and evolutionary consequences of these findings is critical for many areas of research, including life-history evolution, sexual selection, behavior, and applied ecology. Variation in the patterns of age-dependent declines of phenotypic traits has been found both within and among individuals, and this rai...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
Nonlinear effects of climate and density in the dynamics of a fluctuating population of reindeer.
Nonlinear and irregular population dynamics may arise as a result of phase dependence and coexistence of multiple attractors. Here we explore effects of climate and density in the dynamics of a highly fluctuating population of wild reindeer (Rangifer tarandus platyrhynchus) on Svalbard observed over a period of 29 years. Time series analyses revealed that density dependence and the effects of l...
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ژورنال
عنوان ژورنال: Rangifer
سال: 2003
ISSN: 1890-6729
DOI: 10.7557/2.23.5.1700