Nest Site Selection of Black-necked Grebe in Taoli Temple-Alashan Bay Nur in Ordos
The Black-necked Grebe(Podiceps nigricollis)is a national second-class protected bird in China.In the present study,the nest sites of the Black-necked Grebe in Ordos Relict Gull National Nature Reserve were investigated from June to July,2022 to protect them.A principal component analysis method and logistics regression model were used to analyze the relationship between nest site selection and 8 habitat factors,including concealment of the nest,plant coverage in the area,and the abundance of invertebrates surrounding the nest site.The results revealed that the black-necked grebe mainly nested in shallow water areas(water depth was 10.56 cm)with a higher degree of concealment that were not affected by the prevailing wind.The main nest materials were Zannichelia palustris,Spirogyra communs,animal feathers and plant branches.The concealment,plant coverage and invertebrate abundance of the black-necked grebe nest site quadrat(n=20)were significantly higher than those of the control quadrat(n=20,p＜0.01).There was a significant difference between the nested and control quadrat on the factors of whether they were affected by the prevailing wind(x2=26.302,df=1,p＜0.001).These results indicated that plant coverage,invertebrate abundance,concealment of the nest,and whether affected by the prevailing wind were the main factors affecting the nesting of black-necked grebe.In order to better protect the breeding population of black necked grebe in the Ordos Relict Gull National Nature Reserve,it is recommended to continuously replenish water to maintain the stability of the water environment and the coverage of aquatic plants in the reserve,and to conduct long-term monitoring of the replenishment source to ensure water quality.Increasing the abundance of invertebrates in the water to provide sufficient food for black necked grebes and other breeding birds.In addition,plants should be reasonably planted on the south bank of the island in the center of the lake,and construct a three sided earth dam enclosure in the area where black necked grebes nest to improve the concealment of the nest and reduce the impact of the prevailing wind on them.
Black-necked Grebenest-site selectionTaoli temple-Alashan bay nur
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