RESUMENComo una especie amenazada, las poblaciones de gacela Iraní han disminuido durante las décadas pasadas. El conocimiento de la ecología de la gacela que incluye sus hábitos alimentarios y las asociaciones del habitat que utiliza son centrales para cualquier tipo de esfuerzo de conservación. La ecología de gacelas es pobremente conocida y las asociaciones del habitat de ésta y otras especies de gacelas no se han estudiado en Irán. La gacela Iraní en el habitat de 6000 ha (en el Parque Nacional de Bamoo ) se estudió durante el periodo de Otoño e Invierno. El uso del habitat fue relacionado con las comunidades de vegetación y su composición, por medio del conteo de los grupos fecales cada dos meses: de septiembre/ octubre 2004 a marzo/abril 2005, en 15 transectos permanentes de 2.5 x 200 metros que se localizaron al azar. La densidad de los grupos fecales fue muy similar en cuatro comunidades vegetales, mientras en la comunidad vegetal 1 en la que Scariola orientalis era dominante, fue significativamente menor. La densidad de gacelas está positivamente asociada con tres especies de arbustos (especie: Astragalus spp., Ebenus stellata , Achillea eriophora con P <0.01, P <0.05, P<0.05, respectivamente) y dos especies de pasto (Poa bulbosa y Aegilops umbellulata, P <0.05) y negativamente asociada con Helichrysum leucocephalum (P <0.01), Scariola orientalis (P <0.01) y Centaurea virgata (P <0.01). Las observaciones acerca de la conducta alimentaria mostraron que las gacelas consumían Bromus danthoniae y Stipa barbata durante el otoño y Astragalus spp., Poa bulbosa, Aegilops umbellulata y Bromus danthoniae durante el invierno. Palabras Clave: Uso del habitat, gacela Iraní, hábitos alimentarios, Parque Nacional de Bamoo . ABSTRACTAs a threatened species populations of Persian gazelle have been declining within the country over the last few decades. The knowledge of gazelle ecology including their feeding habits and habitat associations is central to any kind of conservation effort. The ecology of gazelles in Iran is poorly known and habitat associations of this or other species of gazelles have not been studied in Iran. Habitat use by Persian gazelle was studied over autumn-winter period in its 6000 ha habitat in Bamoo National Park. Habitat use was related to plant communities and vegetation composition by clearance transect pellet group counts carried out every 2 months from September/October 2004 to March/April 2005 using 15 randomly placed 2.5 x 200 m permanent transects. The density of pellet groups was similar in 4 out of 5 Nowzari et al.:Habitad use by persian gazelle 110 plant communities, while in plant community 1, in which Scariola orientalis was the dominant species, it was significantly lower. The density of gazelles was positively associated with three species of bushes (Astragalus spp., Ebenus stellata, Achillea eriophora, P<0.01, P<0.05, P<0.05 respectively) and two species of grass (Poa bulbosa and Aegilops umbellulata, P<0.05) and negatively associated with trichomic Helichrysum leucocephalum (P<0....
About 90% of existing particulates in atmosphere have natural origin and the remained 10% have artificial origin (1-3). Health effects of particulates have a wide range but mostly are related to respiratory and cardiovascular systems. Although, population is affected by air pollution, intensity effect can be different according to age, health of persons and sensitivity to pollution (3,4). The rate of possible implications will be increased with increase in persons' exposure to pollution (5,6). There are few evidences on a suggested threshold without any unfavorable effect in it.
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