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首页> 外文期刊>Journal of Wildlife Management >Effects of forest management on density, survival, and population growth of wood thrushes.
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Effects of forest management on density, survival, and population growth of wood thrushes.

机译：森林经营对鹅口疮密度，存活率和种群增长的影响。

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Loss and alteration of breeding habitat have been proposed as causes of declines in several Neotropical migrant bird populations. We conducted a 4-year study to determine the effects of winter prescribed burning and forest thinning on breeding woodthrush (Hylocichla mustelina [Catharus mustelinus]) populations at the Piedmont National Wildlife Refuge (PNWR) in Georgia. Forest cover was mixed, dominated by pines (Pinus), principally Pinus taeda, with broadleaved species. We estimated density, adultand juvenile survival rates, and apparent annual survival using transect surveys, radiotelemetry, and mist netting. Burning and thinning did not cause lower densities (P = 0.25); wood thrush density ranged from 0.15 to 1.30 pairs/10 ha. No radiomarked male wood thrushes (n = 68) died during the 4 years, but female weekly survival was 0.981±0.014 (SE) for females (n = 63) and 0.976±0.010 for juveniles (n = 38). Apparent annual adult survival was 0.579 (SE = 0.173). Thinning and prescribed burning did not reduce adult or juvenile survival during the breeding season or apparent annual adult survival. Annual population growth (lambda) at PNWR was 1.00 (95% confidence interval (CI) = 0.32-1.63), and the considerable uncertainty in this prediction underscores the need for long-term monitoring to effectively manage Neotropical migrants. Population growth increased on experimental compartments after the burn and thin (95% CI before = 0.91-0.97, after = 0.98-1.05), while control compartment lambda declined (before = 0.98-1.05, after = 0.87-0.92). We found no evidence that the current management regime at PNWR, designed to improve red-cockaded woodpecker (Picoides borealis) habitat, negatively affected wood thrushes.
机译：已经提出了繁殖栖息地的丧失和改变是几种新热带候鸟数量下降的原因。我们进行了一项为期4年的研究，以确定冬季规定的焚烧和森林抚育对佐治亚州皮埃蒙特国家野生动物保护区（PNWR）繁殖的画眉（Hylocichla mustelina [Catharus mustelinus]）种群的影响。森林覆盖混合，以松树（松树）为主，主要是阔叶松，有阔叶树种。我们使用横断面调查，无线电遥测和薄雾网估计了密度，成年和少年生存率以及表观年生存率。燃烧和稀化不会引起较低的密度（P = 0.25）。木材画眉密度为0.15至1.30对/ 10公顷。在这4年中，没有放射性斑纹鹅口疮（n = 68）死亡，但是女性（n = 63）的女性每周存活率为0.981±0.014（SE），而青少年（n = 38）的女性每周存活率为0.976±0.010。成年人的表观年生存率为0.579（SE = 0.173）。细化和规定的燃烧不会降低繁殖季节的成年或少年成活率，也不会降低成年成年成活率。 PNWR的年人口增长（lambda）为1.00（95％置信区间（CI）= 0.32-1.63），该预测中的相当大的不确定性凸显了需要进行长期监测以有效管理新热带移民。燃烧和稀薄后（实验室的95％CI之前为0.91-0.97，之后为0.98-1.05），种群增长有所增加，而对照室λ下降了（之前为0.98-1.05，之后为0.87-0.92）。我们没有发现证据表明，PNWR的当前管理制度旨在改善红啄木鸟（Picoidesborealis）的栖息地，对鹅口疮产生了负面影响。

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