For tuber-feeding birds, there was no effect of spatial heterogeneity on swan goose density, but a marginally significant negative effect was found on densities of tundra swan ( Table 1 ).
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Effect of conservation efforts and ecological variables on waterbird population sizes in wetlands of the Yangtze River.
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The abundance of bean goose and lesser white-fronted goose first showed an increasing trend at the beginning of the decade and then remained stable ( Fig. 1a,c ).