نتایج جستجو برای: rare species
تعداد نتایج: 777083 فیلتر نتایج به سال:
Biological diversity and species richness have been declined throughout the world as a result of human activities. Measuring species richness is important in rangeland conservation to evaluate the status and trends of native plant species, detecting non-native species invasion and monitoring rare species. However, heterogeneity in plant distribution makes inventories difficult. In this study tw...
The rare and endangered plants of any country are important genetic resources that often require urgent conservation measures. Assessment of phylogenetic relationships and evaluation of genetic diversity is very important prior to implementation of conservation strategies for saving rare and endangered plant species. We used internal transcribed spacer sequences of nuclear ribosomal DNA for the...
An ecological community's species diversity tends to erode through time as a result of stochastic extinction, competitive exclusion, and unstable host-enemy dynamics. This erosion of diversity can be prevented over the short term if recruits are highly diverse as a result of preferential recruitment of rare species or, alternatively, if rare species survive preferentially, which increases diver...
Along the Oregon coast there are pockets of exceptionally high diversity of rare lichen species. These include a number of extreme disjunct populations, with affinities to the flora of the southern hemi sphere, tropical and subtropical areas, California, northeast Asia, maritime Arctic, eastern North America, and Europe. Only two of these rare species are endemic to the Pacific Northwest. Conc...
a r t i c l e i n f o Keywords: Rare species Support vector machines (SVM) Random forests (RF) Biodiversity Digital elevation model (DEM) Vegetation mapping It is critical to know accurately the ecological and geographic range of rare and endangered species for biodiversity conservation and management. In this study, we used support vector machines (SVM) for modeling rare species distribution a...
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