摘要
Background:The Hair-crested Drongo(Dicrurus hottentottus) exhibits a unique nest-dismantling behavior after the fledging of the young.One hypothesis explaining this behavior is dismantling one's own nest may reduce potential competition for nest sites in the following breeding season because suitable breeding habitat might be limited,and sites are often reused.Methods:By comparing the habitat features at nest and random locations,we determined the nest habitat preference of the Hair-crested Drongo within Dongzhai National Nature Reserve,Henan,China.We also compared habitat features with nesting success to determine if any trends could be detected.Results:We found that nest tree height,diameter at breast height,live crown ratio,tree rank,and presence of overstory were significantly higher at nesting locations than random locations;slope,leaf litter cover percentage and depth,presence of understory and midstory,and number of trees per hectare were significantly lower at nest sites than random sites.Drongos preferred to use some tree species,such as Metasequoia glyptostroboides,Castanea mollissima,and Pterocarya stenoptera for nesting.Failed nests were often associated with habitat with higher percentage of leaf litter on the ground.Conclusion:Our data support that selection of nest sites does occur for this species at this site and therefore support the hypothesis that breeding habitat limitation could be one of the driving forces for the development of the nestdismantling behavior in this species.
Background: The Hair-crested Drongo (Dicrurus hottentottus) exhibits a unique nest-dismantling behavior after the lfedging of the young. One hypothesis explaining this behavior is dismantling one’s own nest may reduce potential competition for nest sites in the following breeding season because suitable breeding habitat might be limited, and sites are often reused. <br> Methods: By comparing the habitat features at nest and random locations, we determined the nest habitat prefer-ence of the Hair-crested Drongo within Dongzhai National Nature Reserve, Henan, China. We also compared habitat features with nesting success to determine if any trends could be detected. <br> Results: We found that nest tree height, diameter at breast height, live crown ratio, tree rank, and presence of <br> overstory were signiifcantly higher at nesting locations than random locations; slope, leaf litter cover percentage and depth, presence of understory and midstory, and number of trees per hectare were signiifcantly lower at nest sites <br> than random sites. Drongos preferred to use some tree species, such asMetasequoia glyptostroboides,Castanea mollis-sima, andPterocarya stenoptera for nesting. Failed nests were often associated with habitat with higher percentage of leaf litter on the ground. <br> Conclusion: Our data support that selection of nest sites does occur for this species at this site and therefore support the hypothesis that breeding habitat limitation could be one of the driving forces for the development of the nest-dismantling behavior in this species.
基金
support by Dongzhai National Nature Reserve for conducting this study
Funding and support was provided by National Science Foundation East Asia Pacific Summer Institute (EAPSI)
Chinese Ministry of Science and Technology
China Science and Technology Exchange Center
Further funding and support was provided by Alabama A&M University and Beijing Normal University
