There are few species with large populations. This leads to a decrease in natural genetic diversity among bobcat populations. These levels are significantly greater than those found in Arctic populations. It brings increasing interconnectedness among different populations and cultures. Variation exists within all populations of organisms. Alleles occur at different frequencies in different human populations. The Asian elephant lives in areas with some of the highest human populations. This triggered conflicts in other areas with mixed populations, including Nakhchivan. This compares selection occurring in different populations and environmental conditions. Activists blame this on growing urban populations and industrial growth. All four haplotypes were distinct from those of the parental populations. Twelve other states saw decreases in their White populations. Canada remains one of the largest immigrant populations in the world. However, not all beluga whale populations summer in estuaries. This has resulted in improvements in the lung function of their populations.