Hanson Yakutat Creamer’s Field Migratory Waterfowl Refuge (spring) Creamer’s Field Migratory Waterfowl Refuge (fall) Tantramar Marshes The Ecological Register
global
North America
United States
South America/Africa
Europe
Eurasia
Africa/Australasia
•
•
•
•
•
Spizella arborea (bird): 5 samples
Standardised estimates are produced by subsampling and then extrapolating.
Raw richness may be higher when an abundance distribution is uneven.