Population Size and Characteristics of Alouatta pigra Before and After a Major Hurricane
Population Size and Characteristics of Alouatta pigra Before and After a Major Hurricane
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大型飓风前后 Alouatta Pigra 的种群规模和特征
DOI：
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发表时间：
2007
影响因子：
2.5
通讯作者：
Travis S. Steffens
中科院分区：
文献类型：
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作者：
M. Pavelka;Keriann C. McGoogan;Travis S. Steffens
尽管已知一些环境风险和资源会影响灵长类社会群体的进化，但我们对重大自然干扰对灵长类种群的影响知之甚少。 2001 年 10 月，飓风艾里斯袭击了伯利兹南部的猴河流域，为在可获得一些飓风前数据的情况下记录自然灾害的影响提供了独特的机会。我们测量了风暴后 3.5 年受影响森林中黑吼猴的种群特征，并将种群数据与飓风前 52 公顷研究区域的数据进行了比较，该区域可能代表了更大的连续河流森林，所有猴子都来自那里。从 2004 年 2 月到 5 月，我们通过五个样带，每个样带行走 12 次，对 96 平方公里的森林片段中的 28.77 平方公里进行了采样。根据这些数据，我们估计流域内的猴子数量从 9784 只减少到 1181 只，减少了 88%，反映在社会群体数量下降 79% 和群体规模减少 38%。风暴前，75%的社会群体是多男性；风暴过后，74%的群体是单男性。虽然成年雌性与雄性的比率略有改善，但成年与未成熟的比率以及成年雌性与未成熟的比率增加了一倍以上，表明生长潜力要低得多。这些数据提供了对重大自然干扰如何影响灵长类动物种群的定量评估。
Although some environmental risks and resources are known to affect the evolution of primate social groups, we know little about the effect of major natural disturbances on primate populations. Hurricane Iris hit the Monkey River watershed in southern Belize in October 2001, presenting a unique opportunity to document the effects of a natural disaster under circumstances wherein some pre-hurricane data were available. We measured the characteristics of the population of black howlers in the affected forest 3.5 years after the storm and compared the population data with pre-hurricane data from a 52-ha study area, that may represent the larger continuous riverine forest and from which all monkeys were known. From February to May 2004, we sampled 28.77 km2 of the 96-km2 forest fragment via five transects walked 12 times each. From these data we estimate that the population in the watershed has dropped from 9784 to 1181 monkeys, a reduction of 88%, reflected by both a 79% drop in the number of social groups and a 38% reduction in group size. Before the storm, 75% of the social groups were multimale; after the storm, 74% of the groups were unimale. While the ratio of adult females to males improved slightly, the ratio of adults to immatures, and adult females to immatures more than doubled, indicating a much lower potential for growth. These data provide a quantitative assessment of how a major natural disturbance can affect a primate population.