Jacky winter

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Jacky winter

Least Concern  (IUCN 3.1)[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Infraorder:
Passerides
Family: Petroicidae
Genus: Microeca
Species:
M. fascinans
Binomial name
Microeca fascinans
(Latham, 1801)

The jacky winter (Microeca fascinans) is a small grey-brown robin found commonly throughout Australia and also in Papua New Guinea. The jacky winter acquired its name due to rapid and strong vocalisations, which sound like jacky-jacky winter-winter.[2] Their call is also often referred to as sounding like peter-peter-peter.[3] Its habitats include open woodlands and farmlands.

Taxonomy and distribution

The jacky winter belongs to the family of

Muscicapidae) in Europe, Africa, and Asia. This is an example of convergent evolution.[7][8]

The generic name Microeca derives from the Greek micros meaning 'small' and oikos meaning 'house'. This refers to the fact that they build the smallest nest of any Australian bird.[9] The specific name fascinans is Latin for 'fascinating' and derives from fascinare meaning 'to bewitch'.[9]

Other vernacular names for the jacky winter are brown flycatcher, peter peter, postboy, spinks and stumpbird.[3][10]

There are three races of jacky winter found in

Victoria, and southeastern South Australia. There are also Microeca fascinans assimilis, which is found in South Australia and south Western Australia, and Microeca fascinans pallida, which is found in northern and western Queensland, Northern Territory, and the Kimberley in Western Australia.[2][7][11][12] Microeca fascinans zimmeri is a subspecies of jacky winter found in Papua New Guinea[13]

Description

The jacky winter is around 12 – 14 cm in length (including the tail) and its weight varies from 14 – 18 g.[14] The plumage of M. f. fascinans includes a greyish breast with white on the bottom half, its head and back is greyish-brown, while its wings are a darker brown with white edges. The bill is black, it has a narrow eye-line and a buff alula stripe. The tail of M. f. fascinans is blackish brown with white outer feathers. Its legs are black. Subspecies M. f. assimilis is very similar to M. f. fascinans; however, it is darker, with more grey over the breast and flanks, covering up the white which is seen on M. f. fascinans.[14] M. f. pallida is smaller than the other two subspecies, being only around 13 cm. M. f. pallida is much more pallid than the other subspecies, and is usually a sandy brown colour.[12]

Behaviour

Rush Creek, south-east Queensland

The jacky winter can be heard vocalising before sunrise and usually stops towards the middle of the day. Occasionally closer to sunset, it can be heard again.

parasites, which may be present in amongst the feathers.[16]

Diet

The jacky winter is an

predator, which moves amongst perches to locate food. This is a continuous activity that can cover long distances in order to find prey items.[17] The jacky winter has two methods of hunting, which include hawking and ground-pouncing. Hawking is when a bird flies and drops to the ground, grabbing their prey during flight, while ground-pouncing is when they fly from a perch, grabbing prey as they land.[18] Both of these hunting styles are used quite commonly by the jacky winter.[17][18][19]

Reproduction

Female nesting

In many species of birds, the male plumage is quite bright and flamboyant to attract the opposite sex in hope of finding a partner to mate with. The jacky winter is instead a sexually monomorphic bird, which means that both the male and female are almost identical in appearance.[14] Rather than plumage playing a significant role in attracting the opposite sex, the jacky winter male uses song to attract a female during courtship.[15] In the eastern states of Australia, the jacky winter breeds mostly to the west of the Great Dividing Range, where a suitable habitat of eucalyptus woodland is present. They build a small, open cup-shaped nest, which is often made from grass and bark strips held together by spider webs. The nest is built in an exposed position, usually on a fork of a branch.[14]

The breeding season of jacky winters occurs from September to November. Leading up to September, singing from the males is at its highest peak, then as the

environmental factors determine the number of eggs per clutch in order to maximize the survival rate of fledglings from the nest.[20]

Territory size of the jacky winter has been recorded at 1.7 ha, which is similar to other species of

Petroicidae, such as the flame robin and scarlet robin. The jacky winter seems to favour habitats for breeding that contain a eucalyptus box woodland or open box woodland, which have patches of box trees and isolated live trees. Fallen logs and stumps are also favoured in habitat selection.[14] The jacky winter holds these territories by perching on top of these eucalyptus trees and keeping a regular sustained call. The breeding density of jacky winters is about 17.2 ha for one pair.[14] The jacky winter is known to defend their territory all year around.[12]

Status

The jacky winter is a common species of bird found throughout

IUCN (International Union for Conservation of Nature). Like many other small woodland birds in Australia, the jacky winter populations are declining and are considered to be a common species but decreasing.[21]

All subspecies of the jacky winter in

Victoria;[14][21][22] M. f. assimilis is declining throughout Western Australia and parts of South Australia;[12][19] M. f. pallida is declining throughout parts of Queensland, the Northern Territory, as well as the Kimberley in Western Australia.[12]

Threats

A number of species of woodland birds, such as the jacky winter, are declining and going locally

degradation of their habitats. These deleterious changes are not only happening in Australia, but around the world.[22][23][24] Since European settlement in Australia, much of the woodlands have been converted to arable land and pasture, for crops to grow and for livestock to graze.[22] Grazing livestock has impacted the jacky winter by decreasing the amount of small, ground and shrub vegetation, creating a lot of bare ground. This bare ground disadvantages the ground-pouncing jacky winter because a decrease in the larger terrestrial arthropods that they feed upon occurs.[17]

The increase of bare ground, created by woodland fragmentation and degradation, can also cause nesting resources of the jacky winter to become scarce due to the increase of weeds in the area. This results in the jacky winter having to try to find another suitable habitat.

insectivores, such as the jacky winter. The jacky winter suffers quite negatively from the presence of the noisy miner, as it cannot outcompete it for food resources. The noisy miner has quite a negative impact on tree health, which also limits the availability of suitable nesting material for the jacky winter.[27]

geographical and elevation range of birds quite significantly. These effects are seen all over the world on a number of different species.[28][29][30][31] What threatens the jacky winter in Australia is rising temperature and evapotranspiration, causing more droughts and increasing fire severity and frequency.[30][32] It is expected that these will impact the availability of food, as well as safe nesting sites and refuges from predators.[33] The rising temperature has already caused birds around the world to decrease in body size. This has been interpreted as a micro-evolutionary response to global climate warming, and to the changes in nutrition associated with declining food availability and habitat quality, which the jacky winter is undergoing in southeastern Australia.[34]

References

Wikimedia Commons has media related to Microeca fascinans.
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  1. doi:10.2305/IUCN.UK.2016-3.RLTS.T22704769A93984438.en
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  9. ^ a b Jobling, James A. "Helm Dictionary of Scientific Bird-names". Retrieved 10 April 2020.
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  12. ^ a b c d e Reid, J. R. W. and Gillen, J. S. 2013. Riparian bird assembladges of Cooper Creek, South Australia Archived 4 March 2016 at the Wayback Machine. – South Australian Arid Lands Natural Resources Management Board.
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  17. ^ a b c Recher, H. F., Davis, W. E. and Calver, M. C. 2002. Comparative foraging ecology of five species of ground-pouncing birds in western Australian woodlands with comments on species decline. – Ornithol. Sci. 1: 29–40.
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  19. ^ a b Recher, H. F. and Davis Jr, W. E. 2002. Foraging profile of a Salmon Gum woodland avifauna in Western Australia. – Journal of the Royal Society of Western Australia. 85: 103–111.
  20. doi:10.1007/978-1-4615-6781-3_2
  21. ^ a b Reid, J. R. W. 1999. Threatened and declining birds in the New South Wales Sheep-Wheat Belt: I. Diagnosis, characteristics and management. Consultancy report to the NSW National Parks and Wildlife Service. – CSIRO Wildlife and Ecology.
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  23. ^ Ford, H. A., Barrett, G. W., Saunders, D. A. and Recher, H. F. 2001. Why have birds in the woodlands of Southern Australia declined? – Biol. Cons. 97: 71–88.
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  28. ^ Neuhӓuser, M. 2007. Climate change and the arrival of self-introduced bird species in New Zealand. – Notornis. 54: 11–14.
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  33. ^ Ford, H. A., Walters, J. R., Cooper, C. B., Debus, S. J. S. and Doerr, V. A. J. 2009. Extinction debt or habitat change? – Ongoing losses of woodland birds in north-eastern New South Wales, Australia. – Biol. Cons. 142: 3182–3190.
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