香港大埔滘天然次生林鸟类群落结构变化

观察了香港最大的大埔滘天然次生林内鸟类群落结构在10a间的变化。用t檢验比较了1993~1995年和2003~2005年间的10种数量最高的鸟类的密度变化。所有的泛生境留鸟种类的密度均呈显著减少。两种树林种类的密度有显著増加,其中一种是本土种,另一种是外来种。香港树林鸟类群落的变化趋势主要受到两个因素的影响,包括缺少有树林种类鸟居住的树林,和外来种的入侵。

Changes of a forest bird community in Hong Kong in 10 years

The changes in the bird community structure of the largest natural secondary forest of Hong Kong over 10 years were investigated. Densities of the 10 most abundant species in 1993-1995 and 2003-2005 were compared using t-test. All resident habitat generalists showed significant decline in densities. Two forest specialists showed significant increase in densities, one is native and the other is exotic species. The trend of change of forest bird community of Hong Kong is mainly related to the absence of nearby forests that could act as source of forest dependent species to colonize the local secondary forests, and the invasion of exotic species.