SAEIJS HLF & BAPTIST HJM (1977) Waterfowl in the changing delta of the south-west Netherlands. LIMOSA 50 (3): 98-113.

In de period 1972 - 1976 eight simultaneous bird counts have been organised in the Delta area in the south-western part of the Netherlands. The results are enumerated in Table 4. Comparison with counts from 1966 / 1967 shows that the total numbers of waterfowl have not changed appreciably. Per species and area important alterations in numbers have occurred. According to our views the causes ?of these changes are to be found partly inside and partly outside the Delta area. A survey of the tendencies and of the causes of changes is given in Table 5. ##### Great Northern Diver Gavia immer Black-throated Diver Gavia arctica Red-throated Diver Gavia stellata Great Crested Grebe Podiceps cristatus Red-necked Grebe Podiceps grisegena Horned Grebe Podiceps auritus Black-necked Grebe Podiceps nigricollis Little Grebe Tachybaptus ruficollis Great Shearwater Puffinus gravis Northern Fulmar Fulmarus glacialis Dalmatian Pelican Pelecanus crispus Great Cormorant Phalacrocorax carbo European Shag Phalacrocorax aristotelis Grey Heron Ardea cinerea Purple Heron Ardea purpurea Little Egret Egretta garzetta Eurasian Bittern Botaurus stellaris Eurasian Spoonbill Platalea leucorodia White Stork Ciconia ciconia Black Stork Ciconia nigra Greater Flamingo Phoenicopterus roseus Chilean Flamingo Phoenicopterus chilensis Mallard Anas platyrhynchos Common Teal Anas crecca Garganey Anas querquedula Gadwall Anas strepera Eurasian Wigeon Anas penelope Northern Pintail Anas acuta Northern Shoveler Anas clypeata = Spatula clypeata Red-crested Pochard Netta rufina Greater Scaup Aythya marila Tufted Duck Aythya fuligula Common Pochard Aythya ferina Ferruginous Duck Aythya nyroca Common Goldeneye Bucephala clangula Long-tailed Duck Clangula hyemalis Velvet Scoter Melanitta fusca Black Scoter Melanitta nigra Common Eider Somateria mollissima Goosander Mergus merganser Red-breasted Merganser Mergus serrator Smew Mergellus albellus Common Shelduck Tadorna tadorna Greylag Goose Anser anser Greater White-fronted Goose Anser albifrons Taiga Bean Goose Anser fabalis Pink-footed Goose Anser brachyrhynchus = Anser fabalis brachyrhynchus Bar-headed Goose Anser indicus Dark-bellied Brent Goose Branta bernicla Barnacle Goose Branta leucopsis Canada Goose Branta canadensis Red-breasted Goose Branta ruficollis Mute Swan Cygnus olor Whooper Swan Cygnus cygnus Bewick's Swan Cygnus bewickii Black Swan Cygnus atratus Common Buzzard Buteo buteo Rough-legged Buzzard Buteo lagopus Eurasian Sparrowhawk Accipiter nisus Black Kite Milvus migrans White-tailed Eagle Haliaeetus albicilla European Honey Buzzard Pernis apivorus Western Marsh Harrier Circus aeruginosus Hen Harrier Circus cyaneus Montagu's Harrier Circus pygargus Osprey Pandion haliaetus Peregrine Falcon Falco peregrinus Merlin Falco columbarius Eurasian Hobby Falco subbuteo Common Kestrel Falco tinnunculus Common Crane Grus grus Water Rail Rallus aquaticus Common Moorhen Gallinula chloropus Eurasian Coot Fulica atra Eurasian Oystercatcher Haematopus ostralegus Northern Lapwing Vanellus vanellus Grey Plover Pluvialis squatarola European Golden Plover Pluvialis apricaria American Golden Plover Pluvialis dominica Eurasian Dotterel Charadrius morinellus = Eudromias morinellus Common Ringed Plover Charadrius hiaticula Little Ringed Plover Charadrius dubius Kentish Plover Charadrius alexandrinus Ruddy Turnstone Arenaria interpres Common Snipe Gallinago gallinago Great Snipe Gallinago media Jack Snipe Lymnocryptes minimus Eurasian Curlew Numenius arquata Whimbrel Numenius phaeopus Slender-billed Curlew Numenius tenuirostris Black-tailed Godwit Limosa limosa Bar-tailed Godwit Limosa lapponica Green Sandpiper Tringa ochropus Wood Sandpiper Tringa glareola Common Sandpiper Actitis hypoleucos = Tringa hypoleucos Common Redshank Tringa totanus Spotted Redshank Tringa erythropus Common Greenshank Tringa nebularia Terek Sandpiper Tringa terek = Xenus cinereus Red Knot Calidris canutus Purple Sandpiper Calidris maritima Little Stint Calidris minuta Temminck's Stint Calidris temminckii Dunlin Calidris alpina = Calidris alpina schinzii Curlew Sandpiper Calidris ferruginea Sanderling Calidris alba Ruff Philomachus pugnax Pied Avocet Recurvirostra avosetta Red Phalarope Phalaropus fulicarius Red-necked Phalarope Phalaropus lobatus Great Skua Stercorarius skua Pomarine Jaeger Stercorarius pomarinus Parasitic Jaeger Stercorarius parasiticus Glaucous Gull Larus hyperboreus Great Black-backed Gull Larus marinus Lesser Black-backed Gull Larus fuscus European Herring Gull Larus argentatus Common Gull Larus canus canus Black-headed Gull Chroicocephalus ridibundus = Larus ridibundus Little Gull Hydrocoloeus minutus = Larus minutus Sabine's Gull Xema sabini Black-legged Kittiwake Rissa tridactyla Black Tern Chlidonias niger Gull-billed Tern Gelochelidon nilotica Common Tern Sterna hirundo Arctic Tern Sterna paradisaea Little Tern Sternula albifrons Sandwich Tern Thalasseus sandvicensis = Sterna sandvicensis Atlantic Murre Uria aalge Stock Dove Columba oenas Little Owl Athene noctua Long-eared Owl Asio otus Short-eared Owl Asio flammeus Common Kingfisher Alcedo atthis Horned Lark Eremophila alpestris Rock Pipit Anthus petrosus = Anthus spinoletta littoralis Great Grey Shrike Lanius excubitor Zitting Cisticola Cisticola juncidis Bearded Reedling Panurus biarmicus Snow Bunting Plectrophenax nivalis Twite Carduelis flavirostris Carrion Crow Corvus corone Hooded Crow Corvus cornix = Corvus corne cornix Rook Corvus frugilegus

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