جستجوی مقالات مرتبط با کلیدواژه "کوه خم" در نشریات گروه "زیست شناسی"

Winter denning is a major event in the life cycle of brown bears, making den sites important components of bear habitat. In the present study, we investigated the structural characteristics of brown bear dens in Kouhkhom region, located north of Bakhtegan National Park. Structural characteristics, including entrance height, entrance width, chamber width, chamber height, tunnel length, tunnel width, den length, and bed dimensions, were measured for 20 dens (presence locations) and 20 caves where signs of bear were not found (absence locations). For each location, landscape variables including elevation, slope, aspect, distance to roads, distance to human settlements, and distance to water were also determined. Our results indicate that brown bears in this region occupy natural caves, rock crevices, and excavated holes under boulders as winter dens. We recorded eight active dens with bedding made with plant material, with an average dimension of 7×70×78 cm3. The profiles of winter dens in the region were outlined. A comparison of presence and absence locations using two independent samples t test showed significant differences in entrance height and entrance width at the micro scale, and distance to roads, distance to human settlements, distance to water, slope, and elevation at the landscape level. It is very likely that these variables are important determinants of den site selection by brown bears.

A floristic study was done in Kuh-e Khom in east of Arsanjan county as part of the southern Zagros in Fars province. Altitude of the region is ranged from 1740 to 3270 m above sea level. The flora of the region with an emphasis on identifying habitats and the effect of altitude on vegetation were studied and sampling was done from 2010 to 2012. Totally, 440 plant specimens of vascular plant were collected which were belonging to 50 families, 198 genera and 287 species. The angiosperm plants were dominant and from them the dicot plants with 37 families, 167 genera and 246 species had the most diversity. The monocots plants with 9 families, 27 genera and 37 species were the second diversely group in the region. Gymnosperms and Pteridophyte each with two species had the lowest number of species. In respect to species richness, Asteraceae (43 species) was the largest family and after that Breassicaceae (33 species), Poaceae (24 species), Fabaceae (24 species), Lamiaceae (22 species), Caryophyllaceae (19 species) and Boraginaceae (13 species) had the most species diversity. Half of species were therophyte and 68% of species were belonging to Irano-Turanian region.