Population characteristics of feral horses on Cumberland Island, Georgia and their management implications
Population characteristics of feral horses on Cumberland Island, Georgia and their management implications
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佐治亚州坎伯兰岛野马的种群特征及其管理意义
DOI：
10.2307/3802980
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发表时间：
2000
影响因子：
2.3
通讯作者：
C. Hall
中科院分区：
文献类型：
--
作者：
R. Goodloe;R. Warren;D. Osborn;C. Hall
对公共土地上的野生马科动物种群（Equus caballus）的控制仅限于非致命方法。这些方法可以限制种群增长，但是，在不同人口统计和社会结构的种群中，效果可能非常好。许多西方野马种群的特征都有详细记录，但大西洋障壁岛种群的可用数据较少。因此，我们从1986年到1990年对乔治亚州坎伯兰岛的野马种群进行了监测，种群年均增长率为4.3%，年龄结构稳定。拥有 ≥ 1 匹种马的群体平均规模为 4.6 匹马。人口的成年性别比例为 0.6 女性：1.0 男性。大约 66% 的母马在某一年产卵，并且没有幼年母马产卵。雌马驹的年存活率平均为 61.1%。雄性小马驹为 58.8%，母马为 92.4%。大多数带包含一头显性或共显性种马、母马和/或幼年雌性以及小马驹。在我们的研究期间，大多数母马 (62.5%) 改变带≥ 1 次。种公马中，单身汉占50.4%。这些种群特征与其他野马种群不同。坎伯兰岛上的群体规模小、单身汉数量多、群体不稳定程度高以及群体种马的共显性可能会削弱某些形式的非致命性种群控制的有效性。
Control of feral borse populations (Equus caballus) on public lands is restricted to nonlethal methods. These methods can limit population growth, however, efficacy may very among populations with differing demography and social structures Characteristics of many western feral horse populations are well documented, but fewer data are available for Atlantic barrier island populations. Therefore, we monitored a population of feral horses on Cumberland Island, Georgia from 1986 to 1990, Population growth averaged 4.3% annually with a stable age structure. Mean size of bands with ≥ 1 stallion was 4.6 horses. The adult sex ratio for the population was 0.6 females: 1.0 males. About 66% of mares foaled during a given year and no juvenile females foaled. Annual survival rates averaged 61.1% for female foals. 58.8% for male foals, and 92.4% for mares. Most bands contained a dominant or codominant stallion, mares and-or juvenile females, and foals Most mares (62.5%) changed bands ≥ 1 time during our study. Bachelors represented 50.4% of stallions. These population characteristics differed from other feral horse populations. The small band size, large number of bachelors, high degree of band instability, and codominance of band stallions on Cumberland Island likely will linut the efficacy of some forms of nonlethal population control.