CONSERVATION OF PRIORITY BIRD SPECIES IN A PROTECTED AREA OF CENTRAL GREECE USING GEOGRAPHICAL LOCATION AND GIS

摘要: Materials and methodsVegetation measurements were taken within the same circular plots of 50m radius where the birds were sampled. Within each sample unit, five vegetation variables were measured: cover (%) of herbaceous plants, low shrubs, tall shrubs, trees, and% bare ground. In order to avoid observer-related biases in vegetation sampling (Prodon and Lebreton 1981), all vegetation parameter estimations were conducted by the same observer to control for inter-observer variability (Morrison et al. 1992). Bird counts took place in spring and late autumn 2008 on 185 plots using the point count method of 50m radius (Bibby et al. 2000). Each point was separated by at least 250m from all other points to minimize the probability of sampling the same bird more than once.