Chronic wasting disease management plan for free ranging widllife in Montana E6F115F5-9404-4471-AE29-932C1A4C1318 Year: 2005 Figure 3. 2004 Montana White-tailed Deer Distribution and Population Estimate Hu-tdifthnli 7ALlN 1 I' lifeiiiBUcii Miii»:>ith-I U-l hhbni. Ul White-tailed Dew Distribution (Population E&timate = 4ote: DtTtutcn Tappno'rcEa^]lEtEâ .^i'ti^l'â Land :⢠v lem * p DlBlrlbul : i -ztt^i =rs::: 12 â 1: ' El Trial Total irsi:s;= ! K^jjMTn^wju â ir^irai 'WiJdlCiifc-;Ptin\> Viable deer populations exist in some places and not in others, according to
Chronic wasting disease management plan for free ranging widllife in Montana E6F115F5-9404-4471-AE29-932C1A4C1318 Year: 2005 Figure 3. 2004 Montana White-tailed Deer Distribution and Population Estimate Hu-tdifthnli 7ALlN 1 I' lifeiiiBUcii Miii»:>ith-I U-l hhbni. Ul White-tailed Dew Distribution (Population E&timate = 4ote: DtTtutcn Tappno'rcEa^]lEtEâ .^i'ti^l'â Land :⢠v lem * p DlBlrlbul : i -ztt^i =rs::: 12 â 1: ' El Trial Total irsi:s;= ! K^jjMTn^wju â ir^irai 'WiJdlCiifc-;Ptin\> Viable deer populations exist in some places and not in others, according to the distribution of habitat of varying quality. The dynamics of deer populations constantly adjust as the environment fluctuates whether it's the wide variation in mule deer fawn survival and population size experienced in the prairie/breaks or the more limited variation that occurs in white-tailed deer populations on river-bottom habitats augmented by irrigated agriculture. For example, mule deer numbers in the prairie/breaks can double in as little as two years during favorable environmental conditions. In such years, fewer than 20 percent of fawns die in their first year of life and only a percentage or two of adults die of natural causes. When conditions are unfavorable, deer numbers can decline up to 50 percent in a single year. During the severest of conditions, 95 of all fawns may die before their first birthday and 25-35 of adults can succumb to natural causes of mortality. In contrast, mortality patterns for white-tailed deer in river-bottoms associated with irrigated agriculture display less annual variation. Fawn survival and recruitment averages 75+/- 20 fawns/100 adult females which is the highest recorded among all deer populations studied in Montana. Because of high fawn recruitment rates, and low-moderate natural losses of adult females (11-16 percent), whitetail populations in these environments can sustain comparatively high hunter harvest rates (Ham
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