摘要:

SUMMARYBerruti, A. 1979. The breeding biologies of the sooty albatrossesPhoebetria fuscaandP. palpebrata.Emu 79: 161–175.The breeding biologies of the Sooty AlbatrossPhoebetria fuscaand the Light-mantled Sooty AlbatrossP. palpebratawere studied at Marion Island (46°54'S, 37°45'E), Prince Edward group of islands, one of only two (possibly three) groups where they breed sympatrically.Phoebetria fuscais far more abundant thanP. palpebrataat Marion Island.The breeding biologies of the two species were similar; the pre-egg, egg and nestling periods of the breeding cycle are compared. There is an overlap in selection of nest sites but interspecific competition for nest sites is probably not sufficiently intense to limit either species. Giant-petrelsMacronectesmay be important predators of nestlings, specially those offusca.Differences in the pelagic distribution of the two albatrosses and in the composition of their cephalopod prey suggests thatpalpebratafeeds mainly south of the Antarctic Convergence and thus has farther to fly to obtain food thanfuscabecause the Antarctic Convergence lies south of Marion Island. Interspecific differences in shifts of brooding and incubation may be related to the greater distance thatpalpebratamust fly to obtain food.Elsewhere the nestling period ofpalpebratais shorter than that offusca.This is discussed in relation to the availability of food to the two species according to season.Phoebetria palpebratamay have difficulty supplying the nestling with sufficient energy to fledge, at least partly becausepalpebratamust fly farther thanfuscato obtain food.

ISSN:0158-4197    

DOI:10.1071/MU9790161

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYBrooker, M. G., M. G. Ridpath, A. J. Estbergs, J. Bywater, D. S. Hart and M. S. Jones. 1979. Bird observations on the north-western Nullarbor Plain and neighbouring regions, 1967–1978. Emu: 176–190.A systematic account of 135 species of birds observed on or near the north-western Nullarbor Plain from 1967 to 1978 is given. Four habitats have been recognized on the Plain in which twenty-eight sedentary, fifteen nomadic, twenty-nine irregular and nineteen vagrant species were recorded. Regular counts of birds were made in three habitats. During the last forty years, Chiming Wedgebill and Redthroat seem to have disappeared from the Plain Mid the distribution of several others has changed.

ISSN:0158-4197    

DOI:10.1071/MU9790176

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYFord, J. 1979. A new subspecies of Grey Butcherbird from the Kimberley, Western Australia. Emu 79: 191–194.The Kimberley isolate of the Grey ButcherbirdCracticus torquatusis morphologically distinguishable from the subspeciesargenteusin the Northern Territory and is described as a new subspecieslatens.Phylogenetic implications regarding the presence of a partly developed black breast inlatensare discussed and it is concluded thatC. mentalisis closer toC. torquatusthan toC. nigrogularis.

ISSN:0158-4197    

DOI:10.1071/MU9790191

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYFord, J. 1979. Subspeciation, hybridization and relationships in the Little Shrike-thrushColluricincla mega-rhynchaof Australia and New Guinea. Emu 79: 195–210.The shrike-thrushesC. megarhynchaandC. parvulaare considered to be conspecific because they hybridize on the south-western edge of the Gulf of Carpentaria and theC. m. obscurasubspecies group of northern New Guinea is a phenetic link. Geographical variation inC. megarhynchais complex and has resulted from an interplay of ecotypy, past and present allopatric subspeciation and introgressive hybridization. In eastern Australia variation is clinal with a distinct step at the Burdekin Gap indicative of past isolation. Three or four subspecies groups, may be recognized in New Guinea but far too many subspecific names are in use. The evolutionary history ofC. megarhynchais constructed from its pattern of geographical variation and the climatic regime of the late Quaternary and Holocene.Colluricinclacomprises two groups of species andC. boweriis considered to be closest to themegarhyncharather than theharmonicapluswoodwardigroup.

ISSN:0158-4197    

DOI:10.1071/MU9790195

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYBriggs, S. V. 1979. Daytime habitats of waterbirds at four swamps on the northern tablelands of New South Wales. Emu 79: 211–214.Waterbirds at four swamps on the northern tablelands of New South Wales were commonly associated with particular habitats. They could be divided into three groups accordingly. Choice of different habitat probably reduced competition between birds in different groups. Competition within groups may be reduced by choice of different food.

ISSN:0158-4197    

DOI:10.1071/MU9790211

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYSaunders, D. A. 1979. Distribution and taxonomy of the white-tailed and yellow-tailed black-cockatoosCalyptorhynchusspp. Emu. 79: 215–227.The history of the classification of the Yellow-tailed Black CockatooCalyptorhynchus funereusand the White-tailed Black-Cockatoo C.baudiniiis given. The differences between the long-billed (C.baudinii)and short-billed (C.latirostris)forms of the White-tailed Black-Cockatoo are presented: the long-billed form has a longer wing, differently shaped upper mandible, different cranial morphology, different food preferences and different contact calls; the breeding and foraging ranges of the two forms are presented and discussed. Based on these differences, the two forms are treated as separate species. The results of an examination of museum material and literature on the Yellow-tailed Black-Cockatoo are presented. On this evidence the Yellow-tailed Black-Cockatoo is divided into three subspecies: one,C. funereus funereusranges from eastern Victoria, north to Berserker Range (hear Rockhampton, Q.) and has a longer wing and tail, with a slightly larger upper mandible, tarsus and claw; another,C. f. xanthanotus, occurs in southern Victoria, south-eastern South Australia to lower Eyre Peninsula, Kangaroo Island, Tasmania and King, Flinders and Cape Barren Islands, Bass Strait; the third,C. f. latirostris, is white tailed, here transferred fromC. baudinii, and occurs in south-western Australia in the drier inland sandplain and mallee areas.The similarities betweenC. f. xanthanotusandlatirostrisare stressed and discussed; the only major difference is loss of yellow colouring and brown-black spotting. It is suggested that a continuous population of a stock jointly ancestral tofunereusandbaudiniiacross southern Australia was split climatically andC. baudiniiarose from the western isolate and developed specialized adaptations for feeding on the fruits of MarriEucalyptus calophylla.A subsequent invasion later gave rise toC. f. latirostris, which was reproductively isolated from C.baudiniiby different habitat and calls.

ISSN:0158-4197    

DOI:10.1071/MU9790215

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790228

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790230

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790231

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790234

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor