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Table 4 Selected landscape metrics of the M. squamatus wintering distribution in central and east China for 2014, 2015, 2016 and maximum distribution

From: Contribution of citizen science towards cryptic species census: “many eyes” define wintering range of the Scaly-sided Merganser in mainland China

Landscape metric 2014 distribution 2015 distribution 2016 distribution Total distribution
No. of habitat 6226 6017 8660 12,500
Total area (km2) 218,839 165,983 259,863 517,386
Proportion (%) 5.01 3.80 5.95 11.84
Mean patch area (km2) 35.15 27.59 30.01 41.39
Largest patch area (km2) 20,287 14,795 41,894 80,880
Total core area (km2) 106,281 72,600 118,269 271,833
Core area proportion (%) 2.43 1.66 2.71 6.00
Mean core area (km2) 17.07 12.07 13.66 21.75
Max patch core area (km2) 13,903 11,392 31,010 61,170
Habitat cohesion index 9.83 9.82 9.89 9.92