4种次级洞巢鸟巢资源竞争对其繁殖优势度的影响1）

对吉林省左家自然保护区内的4种次级洞巢鸟巢资源竞争与其在群落中的优势度进行了研究。结果表明：大山雀（ Parus major）各巢洞因子的生态位最宽、优势度最大，其后依次为普通币鸟（ Sitta europaea）、白眉姬鹟（ Ficedula zanthopygia）以及沼泽山雀（ Parus palustris）。4种次级洞巢鸟的优势度与巢洞因子的生态位宽度显著相关，说明其对巢资源的竞争可能影响次级洞巢鸟在群落中的繁殖优势度。

Effects of Nest Resource Competition on Breeding Dominance in Four Secondary Cavity-nesting Birds

We studied the effects of nest resource competition on breeding dominance in four secondary cavity-nesting birds at Zuojia Nature Reserve in Jilin Province.The niche breadth of nest cavity factors in Great Tit ( Parus major) were the wi-dest, followed by Eurasian Nuthatch ( Sitta europaea) , Yellow-rumped Flycatcher ( Ficedula zanthopygia) and Marsh Tit ( P.palustris) .Breeding dominance of Great Tit was the highest, followed by Eurasian Nuthatch, Yellow-rumped Flycatch-er and Marsh Tit.The breeding dominance was correlated positively with niche breadth of nest cavity factors in four second-ary cavity-nesting birds.The nest resource competition could influence breeding dominance of secondary cavity-nesting birds within community.