摘要
本文研究了褐头鹪莺 (Priniasubflava)和黄腹鹪莺 (P flaviventris)在取食高度、取食基层和取食方法 3个生态维度上的生态位宽度和生态位重叠以及它们与复合种群密度的关系。结果表明 ,两种鹪莺的现实生态位有较大的重叠 ,且种群密度变化时 ,生态位宽度和生态位重叠发生了显著移动 ,褐头鹪莺与黄腹鹪莺之间存在着竞争 ;它们并没有采取压缩生态位宽度来回避竞争 ,而是相反地各自扩展生态位宽度来减少重叠 ,从而达到减少竞争压力以利于共存的目的。
Greater Brown Wren Warbler ( Prinia subflava ) and yellow bellied Wren Warbler ( P flavive ntris ) are the sympatric species pair in south China.In this paper,the interspecific niche relationship between the two bird species was studied.The authors intended to determine if there is a interspecific competition by means of regression analysis of niche breadth,niche overlaps and complex population density.The results indicated that there was a competition between the two species of Wren Warbler.They did not discrease their niche breadth to avoid competition.On the contrary,they increase their niche breadth respectively to reduce the proportion of overlap so that competition pressure could be discreased.These conditions are favorable to the coexistence.
