Distribution and Numbers of Three Globally Threatened Waterbird Species Wintering in Morocco: The Common Pochard, Marbled Teal, and White-Headed Duck

Table 4

Most important wintering sites of the White-headed Duck (2010–2019).

Site name	Average number^1	1%; NA^2	Max.^3	Importance	Standard deviation
Merja de Sidi Bou Ghaba	170	8	351	SII1/SNI	120
Merja de Wad Fouwarate	225	5	1430	SII2/SNI	419
Barrage Mohammed V	106	3	426	SII2/SNI	145
Dayet Ifrah	15	2	59	SII2/SNI	19
Dayet Hachlaf	15	1	88	SII2/SNI	31
Barrage’Arabat	9	2	22	SII2/SNI	9
Barrage El Mehraz	2	1	6	SII2/SPNI	3
Dayet’Awa	1	0	3	SII2	1

¹The average of the species’ annual numbers counted in a site (their sum is divided by the number of years during which the site was censused). ²Maximum wintering number observed in a site since its first year of census. ³Number of winters during which 1% of the national average (542) is exceeded.