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Post by Melanie on May 7, 2005 15:07:44 GMT
The last record of this species was in 1991, despite intensive searches and major publicity campaigns in the 1990s. It may have been driven extinct by degradation of wetland habitats through various causes. However, it cannot yet be presumed to be Extinct until all areas of remaining habitat have been thoroughly searched, in particular Lake Amparihinandriambavy. Any remaining population is likely to be tiny, and for these reasons it is treated as Critically Endangered (Possibly Extinct).
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Deleted
Deleted Member
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Post by Deleted on May 11, 2005 12:20:11 GMT
Hi ! Aythya innotata ... from 'Birds of Madagascar':  |
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Post by Melanie on May 11, 2005 12:31:08 GMT
Thank you Noisi,
this is the first photo which i see of this bird.
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Post by another specialist on Jun 8, 2005 8:01:37 GMT
Justification The last record of this species was in 1991, despite intensive searches and major publicity campaigns in the 1990s. It may have been driven extinct by degradation of wetland habitats through various causes. However, it cannot yet be presumed to be Extinct until all areas of remaining habitat have been thoroughly searched, in particular Lake Amparihinandriambavy. Any remaining population is likely to be tiny, and for these reasons it is treated as Critically Endangered (Possibly Extinct). Family/Sub-family ANATIDAE Species name author (Salvadori, 1894) Taxonomic source(s) Dowsett and Forbes-Watson (1993), Sibley and Monroe (1990, 1993) Identification 45-56 cm. A medium-sized diving duck. Male is dark chestnut-rufous all over save for white eye, white undertail-coverts, and conspicuous white wing-bar along bases of flight feathers. Bill is dull brown with paler, bluish subterminal band. Female is duller brownish, lacking white eye. Similar spp. From all waterfowl by overall dark plumage and white undertail-coverts and wing-bar extending length of the wing. In addition, from White-backed Duck Thalassornis leuconotus by uniform colouration, dark back and white eye (in male), from Red-knobbed Coot Fulica cristata by mostly dark bill, and from all other ducks by diving habit and running take-off. Hints Rather tame. Population estimate Population trend Range estimate (breeding/resident) Country endemic? <50 unknown - Yes Range & population Aythya innotata is endemic to Madagascar, where it was found historically in the Lake Alaotra basin in the northern central plateau. It is not clear why it has become increasingly rare this century. Until the capture alive of a single male in August 1991, the last certain record was at Lake Alaotra in 1960, with one unconfirmed sighting near Antananarivo in 1970. Intensive searches (including major publicity campaigns) at Alaotra during 1989-1990 and 1993-1994 failed to discover more birds. The species is now on the brink of extinction3. Ecology This diving duck is confined to shallow freshwater lakes and marshes that combine open water with nearby areas of dense vegetation2,3. It probably prefers marshy areas and shallow water with significant vegetation over open-water habitats5. It feeds on invertebrates and aquatic plant seeds by diving frequently in shallow waters and is usually seen alone, occasionally in pairs2. Clutch-size is two and nesting has been observed during March-April2. Threats Lake Alaotra is under considerable and increasing pressure: the area is one of Madagascar's major rice producers, with 250 km2 of the 350 km2 surrounding the lake converted to rice cultivation1. In some areas the lake has been drained and the water used for irrigation1. Soil erosion from deforested hillsides and more intensive agricultural practices have diminished the water quality of the lake4. Introductions of exotic plants, mammals (Rattus) and fish, especially Tilapia, have depleted essential food supplies and likely increased nest-predation for the species4. The introduction of Tilapia into Alaotra probably had a devastating affect on the Pochard and other more widespread waterbirds preferring emergent vegetation5. Some of these species apparently died out at Alaotra but have repopulated from other parts of their ranges as water-lilies and other emergent vegetation have made a comeback along the marsh's southern edge5. Hunting and trapping of adults for food, and death through entanglement in monofilament gill-nets, are probably also major elements in the decline of this species3. Conservation measures underway Efforts are underway to conserve the last vestiges of suitable habitat at Lake Alaotra3. The Malagasy government has ratified the Ramsar Convention, and Lake Alaotra may be proposed as a Ramsar Site. Searches for the species continue, as do education and awareness programmes on the benefits of maintaining natural wetlands. However, implementation of any conservation policy for the area will be very difficult due to Alaotra's huge economic importance for agriculture and fisheries4. Conservation measures proposed Continue searches for extant populations. Protect areas of least-modified wetland at Lake Alaotra. Continue community surveys and wetland awareness programmes. www.birdlife.net/datazone/search/species_search.html?action=SpcHTMDetails.asp&sid=477&m=0 |
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Post by another specialist on Jun 8, 2005 8:03:10 GMT
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Post by another specialist on Jun 8, 2005 8:08:08 GMT
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Post by another specialist on Jun 8, 2005 8:09:30 GMT
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Post by sebbe67 on Jun 8, 2005 8:16:26 GMT
the last photo is not on this bird.
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Post by another specialist on Jun 8, 2005 8:50:50 GMT
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Post by another specialist on Jun 8, 2005 8:52:44 GMT
the last photo is not on this bird. what is it then? it's labelled with same latin name? Aythya innotata |
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Post by sebbe67 on Jun 8, 2005 10:58:23 GMT
its a male Rosy-billed pochard Netta peposaca, which is from the southern part of South America.
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Post by Melanie on Jun 8, 2005 11:07:20 GMT
Forget such Chinese websites. You will find often mislabled photos there. Sometimes it is better to take a closer look on photos and compare them with other photos before you can say this photo belongs to that species. the last photo is not on this bird. what is it then? it's labelled with same latin name? Aythya innotata |
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Post by another specialist on Jun 8, 2005 11:53:32 GMT
Yes i know that myself already but when there is a lack of photos you can't compare for starters.
Plus if you look at even the available pictures or painting the look different from each other.
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Post by another specialist on Jun 8, 2005 21:12:21 GMT
Madagascar pochard also known as Madagascan White-eye White-eyes & Baer's Pochard with Color Plate & Matching Species Key Ferruginous White-eye, Madagascan White-eye, Australian White-eye, Banks Islands White-eye, Baer's Pochard  key  mawba.com/whiteeye.htm |
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Post by sebbe67 on Jun 9, 2005 7:15:41 GMT
really nice plates  I had only seen about one of these before. Do you know from which book they are? |
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Post by another specialist on Jun 9, 2005 9:20:24 GMT
Waterfowl of the World Jean Delacour Product Details: Hardcover (December 1954) Publisher: Hamlyn ISBN: 0600392945 Plates by Peter Scott A very old book very collectable - out of print Have a copy myself |
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Post by sebbe67 on Jun 9, 2005 13:56:36 GMT
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Post by another specialist on Jun 9, 2005 16:03:59 GMT
here is the direct link of the newer addition The Waterfowl of the World (Volumes 1 through 4) by Jean Delacour (Author), Peter Scott (Illustrator) Hardcover Publisher: Arco Publishing Co. (1973) Language: English ISBN: 0668029706 tinyurl.com/7sk2bnot available but you can order second hand copy as and when there available..... |
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Post by sebbe67 on Jun 9, 2005 17:08:19 GMT
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Post by another specialist on Jun 9, 2005 17:19:47 GMT
Ducklings of Eiders, Pochards & Perchig Ducks with Color Plate & Matching Species Key Spectacled Eider, King Eider, Steller's Eider, Common Eider, Rosybilled Pochard, Red-crested Pochard, Madagascan White-eye, Ferruginous White-eye, Australian White-eye, Canvas-back, Red-head, Southern Pochards, European Pochards, Lesser Scaup, Greater Scaup, Brazilian Teals, Maned Wood Duck, Ringed-neck Duck, Tufted Duck, New Zealand Scaup, Carolina Wood Duck, Mandarin Duck,African Pygmy Goose, Indian Pygmy Goose, Green Pygmy Goose, Comb Ducks, White-winged Wood Duck, Muscovy Duck, Hartlaub's Duck, Spur-winged Goose  key  mawba.com/bawoodie.htm |
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I had only seen about one of these before.