Table 3.

Diversity of avian herbivory on Zostera.

Avian taxa	Diet can be 50–100% Zostera, seasonally or year-round	Zostera frequent in diet (5–50%) but rarely dominant	Infrequent or incidental consumption
Dabbling ducks	Anas americana	Anas acuta, Anas penelope (Denmark), Anas platyrhynchos, Anas poecilorhyncha, Anas rubripes, Anas strepera	Anas clypeata, Anas crecca, Anas penelope (North America)
Diving ducks		Aythya affinis, Aythya americana, Aythya ferina, Aythya marila, Aythya valisineria, Bucephala albeola, Bucephala clangula, Clangula hyemalis, Melanitta perspicillata	Melanitta deglandi, Oidemia americana, Oxyura jamaicensis, Polysticta stelleri, Somateria mollissima nigra, Somateria mollissima dresseri, Somateria spectabilis
Geese	Branta bernicla bernicla, Branta bernicla hrota, Branta bernicla nigricans	Branta canadensis, Chen canagica	Anser anser
Swans	Cygnus atratus, Cygnus olor	Cygnus cygnus, Cygnus buccinator	Cygnus columbianus
Rails		Fulica atra	Fulica americana
Waders			Limosa limosa islandica

Details underlying the categorization by importance in the diet are in Supplementary Table S2.