نتایج جستجو برای: عوامل اکولوژیک ecological factors
تعداد نتایج: 1274853 فیلتر نتایج به سال:
We compare lizard assemblages of Cerrado and Amazonian savannas to test the ecological release hypothesis, which predicts that niche dimensions and abundance should be greater in species inhabiting isolated habitat patches with low species richness (Amazonian savannas and isolated Cerrado patches) when compared with nonisolated areas in central Cerrado with greater species richness. We calculat...
این تحقیق با عنوان " پدیده مهاجرت و پیامدهای تربیتی آن" به بررسی علل و انواع مهاجرت و بیان پیامدهای تربیتی آن خواهد پرداخت. در مقدمه، مباحث کلی راجع به پایان نامه چون کلیات طرح تحقیق، مورد بررسی قرار گرفته است. فصل اول عهده دار تبیین مفهوم شناسی و گونه های تربیت و مهاجرت می باشد که در ادامه به انواع مهاجرت نیز اشاره می شود. در فصل دوم، علل مهاجرت تحت عناوینی چون: علل ایدئولوژیک، علل فرهنگی و عل...
1. What is ecological zoogeography 2. Ecogeographical “rules” 2.1. Bergmann’s rule 2.2. Allen’s rule 2.3. Rapoport’s rule 3. Distribution of animals: patterns and causal factors 3.1. Species conceptualization and delimitation: their importance for zoogeography 3.2. Patterns of distribution 3.3. Endemisms and relicts 3.4. Abiotic ecological factors influencing species distribution 3.5. Biotic ec...
The quality of traditional Chinese herbal medicine, which plays a very important role in the health system of China, is determined by the active substances produced by the plants. The type, content, and proportion of these substances may vary depending on ecological factors in areas where the plants are grown. Sinopodophyllum hexandrum (Royle) T.S. Ying, an endangered plant species with great m...
This review examines the psychological impact of adult sexual assault through an ecological theoretical perspective to understand how factors at multiple levels of the social ecology contribute to post-assault sequelae. Using Bronfenbrenner's (1979, 1986, 1995) ecological theory of human development, we examine how individual-level factors (e.g., sociodemographics, biological/genetic factors), ...
The aim of the study was to determine whether an examined group of asthmatic patients differ significantly from a control group of coronary patients with regard to perception of two groups of etiological factors and their interaction: a) ecological factors, and b) habits and behavior of the patients. The study included 100 patients with bronchial asthma and 102 with coronary disease. A question...
BACKGROUND Drug-resistant tuberculosis (DR-TB) is a major public health problem caused by various factors. It is essential to systematically investigate the epidemiological and, in particular, the ecological factors of DR-TB for its prevention and control. Studies of the ecological factors can provide information on etiology, and assist in the effective prevention and control of disease. So it ...
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