The moose population at Voyageurs National Park in northern Minnesota remains stable, according to a recently-completed aerial survey.The 2013 population was estimated to be 46 moose, similar to estimates from 2009-2011. No survey was conducted in 2012). The margin of error is plus or minus 7 percent.The National Park Service said the calf-cow ratio and the percent of calves in the population were relatively high in 2013, also similar to estimates from 2010-2011. Biologists concluded the low-density population that exists in Voyageurs is relatively stable, especially considering the rapidly declining population in northeastern Minnesota moose range. However, park's biologists cautioned that other large-scale factors such as climate change and disease outbreaks continue to threaten the long-term viability of the small, isolated population in the park, and continued monitoring is warranted.