Download A Photographic Guide to Birds of Southern Africa by Ian Sinclair PDF

By Ian Sinclair

ISBN-10: 1770070834

ISBN-13: 9781770070837

Характеризует 750 видов южноафриканских птиц, включая не только резидентные и размножающиеся, но и большинство мигрантов. Фотографии, многие их которых демонстрируют птиц в полете, иллюстрируют разнообразие форм и раскрасок.
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Extra info for A Photographic Guide to Birds of Southern Africa

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Ashley Carlson Having more in common with swans and geese than the ‘true’ ducks, the Whistling Ducks have only a single moult each year. The male and female, which apparently mate for life, show little or no sexual dimorphism and share the nest building, incubation of the eggs and care of the young. While there are clear similarities between Plumed and Wandering Whistling Ducks, one of the more significant differences is in feeding; while Wandering feed almost entirely in water, and commonly during the day, Plumed feed mostly on land, and at night.

Counts during the 1990s and 2000s showed the highest mean number was in October, but there was considerable variation in numbers between years. From 1974 to 1986, the maximum number counted in the Darwin region was 170 birds, in November 1978,13 but in October 2002 1250 birds were recorded at Leanyer SP, and 1000 were present at McMinns Lagoon. 29 Wandering Whistling Duck Dendrocygna arcuata RANGE: largely tropical Australia, NG, Philippines and Indonesia. HABITATS: wetlands. STATUS: common resident.

By 1980 numbers had recovered to levels comparable to those before the decline,10 and subsequent research, between 1980 and 1988 at Kapalga, Kakadu NP, showed that buffalo trampling and grazing influenced the location of nests, but not their numbers. It was found that the decline was more likely due to a combination of fire damage to floodplains and poor rains. Indeed, nesting studies on the Mary River during 1988–9311 38 J F M A M J J A S O N D revealed that the density of nests fluctuates markedly from year to year, almost failing completely in El Niño years, and depends on the time of the onset of the Wet season.

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