嘉陵江中游长嘴剑鸻冬季觅食地选择

2009年12月至2010年2月,在嘉陵江中游采用样方法研究长嘴剑鸻Charadriusplacidus冬季觅食地选择。通过Mann-Whitney检验,发现基质类型、土壤动物生物量、裸地面积比例、距明水距离和坡度等变量在长嘴剑鸻的觅食地样方(n=62)和对照样方(n=62)间存在极显著性差异(Mann-Whitney检验,P<0.01)。对存在显著性差异的变量进行逻辑斯谛回归分析表明,裸地面积比例对长嘴剑鸻觅食地选择的影响最大,然后依次是坡度和土壤动物生物量。此外,对比渠化江段和自然江段长嘴剑鸻觅食地样方的结果表明,二者在距人为干扰距离和基质类型两个变量间存在显著性差异(Mann-Whitney检验,P<0.05),这在一定程度上反映了长嘴剑鸻对渠化江段的部分适应。总之,长嘴剑鸻偏好在食物丰富、坡度平缓的近水源裸露鹅卵石滩觅食。因此,加强沿江滩涂的保护对长嘴剑鸻有着重要意义。

Feeding Sites Selection of Long-billed Plover in Winter at the Middle Reaches of Jialing River

From December 2009 to February 2010,feeding sites selection of long-billed plover Charadrius placidus in winter was studied at the middle reaches of Jialing River by quadrat sampling method.There were very significant differences in variables,such as type of groundmass,biomass of soil animals,the ratio of open ground,the distance to water edge and slope degree,between feeding site plots(n=62) and control ones(n=62)(Mann-Whitney test,P<0.01).The result of logistic regression analysis showed that the ratio of open ground contributed mostly to the feeding sites selection of long-billed plover,and then followed by slope degree and biomass of soil animals.Furthermore,there were significant difference in distance from human disturbance and type of groundmass between feeding sites in canalized river reach and natural one(Mann-Whitney test,P<0.05),which indicated long-billed plover had adapted to the environment of canalized river reach to some extent.In brief,long-billed plover prefer to feeding in the washlands where are rich in food,with gentle slope degree and near the water.Therefore,it is important for long-billed plover to protect the washland of the Jialing River.