Boulord A.,Shanghai Key Laboratory of Urbanization and Ecological Restoration |
Wang T.-H.,Shanghai Key Laboratory of Urbanization and Ecological Restoration |
Wang X.-M.,Shanghai Key Laboratory of Urbanization and Ecological Restoration |
Song G.-X.,Chongming Dongtan Nature Reserve
Bird Conservation International | Year: 2011
The Reed Parrotbill Paradoxornis heudei is an endemic reedbed-inhabiting passerine of east Asia. In the Shanghai municipality, which harbours significant populations of this species, almost all reedbed surfaces are annually harvested. Furthermore, the reedbeds are being invaded by Smooth Cordgrass Spartina alterniflora, an introduced species that can outcompete the native Common Reed Phragmites australis. In this paper, we have shown that Reed Parrotbills do not nest in areas dominated by Smooth Cordgrass and avoid using them. In the areas that are primarily composed of Common Reed, the densities of birds are higher in the unharvested sections. The birds appear to select nesting sites with low Smooth Cordgrass densities, tall reed stems, and relatively equal densities of both dry and green stems. Reed harvesting activity results in vegetation that is too low for bird nesting. However, no nests were found in areas where the reeds had not been harvested for several years and had high densities of dry reed stems; these results could be attributed to the fact that the high density of broken stems reduced the vegetation cover. On the basis of our results, we recommend implementation of four years harvesting-cycle rotation and avoidance of reclamation in reedbeds which have not been invaded by Smooth Cordgrass. © 2010 BirdLife International.
Zhou Q.,Fudan University |
Xue W.,Chongming Dongtan Nature Reserve |
Tan K.,Fudan University |
Ma Q.,Chongming Dongtan Nature Reserve |
And 4 more authors.
Emu | Year: 2016
Migratory birds face serious time constraints in their life cycles. Species carry on their activities during optimal time windows to maximise their fitness. To understand the temporal patterns of migrating shorebirds, we analysed the pattern of turnover within shorebird communities during northward and southward migration at Chongming Dongtan, a stop-over site in the southern Yellow Sea along the East Asian-Australasian Flyway. Results indicated that temporal patterns in shorebird communities differed between seasons. In the boreal spring, the rate of community turnover was initially slow, then increased rapidly midseason, and finally stabilised. In the boreal autumn, in contrast, the rate of community turnover kept constant. This suggests that shorebird species exhibited more temporal overlap in spring than in autumn, perhaps because time constraints are more severe at breeding than non-breeding grounds. The species sequence was strongly linked with breeding latitude: species that breed farther north occurred at the study site later than those that breed farther south on both northward and southward migration. Moreover, large species were more likely to arrive at the stop-over site early on northward (but not on southward) migration than small species. Integrated with the results from intraspecific studies, we propose that the timing of migration is closely related to the breeding latitude both among and within species. © BirdLife Australia 2016.