Crimson Rosella
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| Platycercus elegans |
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 Crimson Rosella range (in red; all-year resident)
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The Crimson Rosella (Platycercus elegans) is a parrot native to eastern and south eastern Australia which has been introduced to New Zealand and Norfolk Island. It is commonly found in, but not restricted to, mountain forests and gardens. The species as it now stands has subsumed two former separate species, The Yellow Rosella and the Adelaide Rosella. Molecular studies show one of the three red-coloured races, var. nigrescens is genetically more distinct.
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[edit] Taxonomic history
Though described by Johann Friedrich Gmelin in Systema Naturae as Psittacus elegans in 1788, the Crimson Rosella had been described and named by John Latham in 1781 as the Beautiful Lory, and then Pennantian Parrot. However he didn't give it a Latin name until 1790, when he named it Psittacus pennanti. In 1854, it was placed in the genus Platycercus by Martin Lichtenstein in his Nomenclator Avium Musei Zoologici Berolinensis.
Today, the red-coloured races are generally known as the Crimson Rosella, with the alternate names Red Lowry, Pennant's Parakeet, Campbell Parakeet, (Blue) Mountain Parrot, (Blue) Mountain Lowry or just plain Lowry occasionally heard. Cayley reported that the first two alternate names were most common in the early part of the twentieth century. On Norfolk Island it is called simply Red Parrot.
The Yellow Rosella, also known by a variety of alternate common names including Murrumbidgee Lowry, Murray Rosella, Swamp Lory and Yellow-rumped Parakeet, was described as Platycercus flaveolus by John Gould, who gave it the last common name mentioned. It was reduced to subspecies status once hybridization was noted where ranges overlap, however some authorities maintain the hybridization is not widespread and hence preserve its specific status. This view is in the minority, however.
[edit] Description
Platycercus elegans is a medium-sized Australian parrot at 36 cm long, much of which is tail. There are five subspecies, three of which are actually crimson. The red is replaced by yellow in the case of var. flaveolus and a mixture of red, orange and yellow in the Adelaide Rosella.
Adults and juveniles generally show strikingly different colouration in south-eastern populations, with predominantly greenish-olive body plumage on the juvenile, most persistent on the nape and breast. Juveniles are said to 'ripen' as they get older and turn from green to red. All races have blue cheeks and black-scalloped blue-marginned wings and predominantly blue tail with predominantly red coloration. The Rosella’s blue tail feathers are one of the favourite decorations of the Satin Bowerbird. The bill is pale grey and the iris dark brown.
There is very little sexual dimorphism in Crimson Rosellas. The most noticeable difference between genders is that males are up to 15% larger, and have a relatively larger and wider beak.
[edit] Crimson Rosella
P. elegans elegans, the nominate race of Victoria and eastern New South Wales. P. elegans nigrescens, occurring on Queensland's northeastern coast, and P. elegans melanoptera on Kangaroo Island. The main distinctions between these is size: nigrescens is the smallest of the three and melanoptera is the largest; both are slightly darker than the nominate race.
The juveniles of var. nigrescens lack the greenish immature plumage of the other subspecies of Crimson Rosella
[edit] Yellow Rosella
The Yellow Rosella, which lives along the Murray River, was reclassified (1968) as a subspecies, P. elegans flaveolus, of the Crimson as the two were found to interbreed where their ranges overlap. The main difference between the two is that those parts of the Crimson which are red are on the Yellow bright yellow.
[edit] Adelaide Rosella
The Adelaide Rosella of Adelaide and the surrounding area, was also thought to be a separate species, but is presently believed to be a hybrid swarm, having originated through interbreeding of the Crimson and Yellow Rosellas. Both of these still interbreed with the Adelaide Rosella where its range crosses theirs, and it exhibits variation in its plumage from dark orange-red in the south of its distribution to a pale orange-yellow in the north. Variants that are very close to the Yellow race are designated subadelaidae.
[edit] Habitat
The Crimson Rosella is common in coastal and mountain forests at all altitudes. They primarily live in forests and woodlands, preferring older and wetter forests. They can be found in tropical, subtropical, and temperate rainforests, both wet and dry sclerophyllous forests, riparian forests, and woodlands, all the way from sea-level up to the tree-line. They will also live in human-affected areas such as farmlands, pastures, fire-breaks, parks, reserves, gardens, and golf-courses. They are rarely found in treeless areas. At night, they roost on high tree branches. Almost all Rosellas are sedentary, although occasional populations are considered nomadic; no Rosellas are migratory.
[edit] Diet
Crimson Rosellas forage in trees, bushes, and on the ground for the fruit, seeds, nectar, berries, and nuts of a wide variety of plants, including members of the Myrtaceae, Asteraceae, and Rosaceae families. Despite feeding on fruits and seeds, Rosellas are not useful to the plants as seed-spreaders, because they crush and destroy the seeds in the process of eating them. Their diet often puts them at odds with farmers whose fruit and grain harvests can be damaged by the birds, which has resulted in large numbers of Rosellas being shot in the past. Rosellas will also eat many insects and their larvae, including termites, aphids, beetles, weevils, caterpillars, moths, and water boatmen.
[edit] Nesting and Breeding
Rosellas nest in hollows in tree trunks, limbs, and stumps. The nesting site is selected by the female. Once the site is selected, the pair will prepare it by lining it with wood debris made from the hollow itself by gnawing and shredding it with their beaks. They do not bring in material from outside the hollow. The nest site tends to be very high off the ground. Only one pair will nest in a particular tree. A pair will guard their nest by perching near it at chattering at other Rosellas that approach. They will also guard a buffer zone of several trees radius around their nest, preventing other pairs from nesting in that area.
The breeding season of the Crimson Rosella lasts from September through to February, and varies depending on the rainfall of each year; it starts earlier and lasts longer during wet years. The laying period is on average during mid- to late October. Hatch size ranges from 3-8 eggs, which are laid asynchronously at an average interval of 2.1 days. The mean incubation period is 19.7 days, and ranges from 16-28 days. Only the mother incubates the eggs. The eggs hatch around mid December; on average 3.6 eggs successfully hatch. There is a bias towards female nestlings, as 41.8% of young are male. For the first six days, only the mother feeds the nestlings. After this time, both parents feed them. The young become independent in February, after which they spend a few more weeks with their parents before departing to become part of a flock of juveniles. Juveniles reach maturity (gain adult plumage) at 16 months of age.
[edit] Call
"Ka-kaw! Ka-kaw! Kah kah kee kee tookie tookie. Tweet tweet... Chirp!"
[edit] Social Behavior
Outside of the breeding season, Crimson Rosellas tend to congregate in pairs or small groups and feeding parties. The largest groups are usually composed of juveniles, who will gather in flocks of up to 20 individuals. When they forage, they are conspicuous and chatter noisily. Rosellas are monogamous, and during the breeding season, adult birds will not congregate in groups and will only forage with their mate.
[edit] Threats to the Rosella
Crimson Rosellas may be eaten by cats or dogs, and have been found to make up a small part of the diet of the fox in some areas. Possums and currawongs are also believed to occasionally take eggs from the nest. Surprisingly, however, the Crimson Rosella is its own worst enemy. During the breeding season, it is common for females to fly to other nests and destroy the eggs. In fact, this is the most common cause for an egg failing to hatch. This behaviour is thought to be a function of competition for suitable nesting hollows, since a nest will be abandoned if all the eggs in it are destroyed, and a pair of Rosellas will tend to nest in the same area from year to year.
[edit] References
- BirdLife International (2005). Platycercus elegans. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern
- Photographic Field Guide Birds of Australia (second edition); ISBN 1-876334-78-9.
- Sindel, Stan & Gill, James (1999). Australian Broad-tailed Parrots. Chipping Norton (Sydney): Surrey Beatty & Sons. ISBN 0-9587727-6-2.
- Lendon, Alan H. (1973): Australian Parrots in Field and Aviary (2nd. ed). Angus and Robertson, Sydney Australia ISBN 0-207-12424-8
- Condon HT. A handlist of the birds of South Australia. South Australian Ornithological Association, Adelaide. 1968.
- Barker, R.D. & Vestjens, W.J.M., 1989, The Food of Australian Birds, vol. 1. Parchment Press Pty Ltd, Melbourne, pp 367-369.
- Carthew, S.M. 1993, “An assessment of pollinator visitation to Banksia spinulosa”, Australian Journal of Ecology, vol. 18, no. 3, pp 257-268.
- Slater, P., 1970, A Field Guide To Australian Birds, vol. 1, Rigby Limited, Sydney, pp 367.
- Higgins, P.J. (ed.) 1999, Handbook of Australian, New Zealand, and Antarctic Birds, vol. 4. Oxford University Press, Melbourne, pp. 321-341.
- Krebs, E.A., 1998, “Breeding biology of crimson rosellas (Platycercus elegans) on Black Mountain, Australian Capital Territory”, Australian Journal of Zoology, vol. 46, no. 2, pp 119-136.
- Pizzey, G., 1994, A Field Guide to the Birds of Australia, Harper Collins Publishers, Sydney, pp. 181.
- Krebs, E.A., Green, D.J., Double, M.C., & Griffiths, R., 2002, “Laying date and laying sequence influence the sex ratio of crimson rosella broods”, Behavioural Ecology and Sociobiology, vol. 51, no. 5, pp. 447-454.
- Wojcieszek, J.M., Nicholls, J.A., Marshall, N.J., & Goldizen, A.W., 2006, “Theft of bower decorations among male Satin Bowerbirds (Ptilonorhynchus violaceus): why are some decorations more popular than others?”, Emu, vol. 106, no. 3, pp. 175-180.
- Seebeck, J.H. 1978, “Diet of the fox Vulpes vulpes in a western Victorian forest”, Australian Journal of Ecology, vol. 3, no. 1, pp. 105-108.
- Gibbons, P. & Lindenmayer, D., 2000, Tree Hollows and Wildlife Conservation in Australia, CSIRO Publishing, Collingwood, Victoria.
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