摘要:

SUMMARYBLACK, A. 1986. The taxonomic of the affinity of the New Guinean MagpieGymnorhina tibicen papuana.Emu 86: 65–70.The New Guinean MagpieGymnorhina tibicen papuanais distinctive in several ways, especially in the exceptionally large bill, which is both longer and deeper than in other forms. In dorsal plumage it is similar to the Western MagpieG.t. dorsalisbut in other characters it resembles the long-billed form of the Black-backed MagpieG.t. longirostrisof north-western Australia. Little is known of its behaviour, calls, nesting, eggs and social organization.The New Guinean and long-billed Magpies may have been derived from a common stock, which was isolated in a northern refuge during an arid phase of the Pleistocene.

ISSN:0158-4197    

DOI:10.1071/MU9860065

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

摘要:

SUMMARYBAKER-GABB, D.J. 1986. Ecological release and behavioural and ecological flexibility in Marsh Harriers on islands. Emu 86: 71–81.Marsh HarriersCircus aeruginosusin New Zealand have undergone both niche expansion and niche shifts. Niche expansion has occurred in the range of habitats hunted over and nested in, because Marsh Harriers in New Zealand exploit all of the range of habitats used by Australian Marsh Harriers as well as hunting over short grass and frequently nesting in tall vegetation well away from wetlands. Harriers in New Zealand have shifted from exploiting the traditional Marsh Harrier food of waterfowl to consuming more of the abundant SheepOvis ariescarrion and road-killed animals. These niche changes and increases in the density of the island population have been facilitated by ecological release from diffuse interspecific competition and differences in resource availability. The interspecific ecological changes observed in New Zealand are probably the result of behavioural and ecological flexibility within the species rather than recent genetic change.

ISSN:0158-4197    

DOI:10.1071/MU9860071

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

摘要:

SUMMARYRINKE, DIETER. 1986. Notes on the avifauna of Niuafo'ou island, Kingdom of Tonga. Emu 86: 82–86.Observations on the status and habits of birds of the Tonga island of Niuafo'ou are recorded and short notes are given on most of the 16 species observed, with special reference to the Niuafo'ou Megapode. The Jungle Mynah is recorded for the first time on the island. The avifauna comprises Fijian, Samoan and Tongan elements, and it is characterized by a low degree of endemism. The volcanic activity of Niuafo'ou may have had a considerable influence on the number of bird species and on the rates of extinction and successful colonization.

ISSN:0158-4197    

DOI:10.1071/MU9860082

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

摘要:

SUMMARYFORD, J. 1986. Avian hybridization and allopatry in the region of the Einasleigh Uplands and Burdekin-Lynd Divide, north-eastern Queensland. Emu 86; 87–110.The Einasleigh Uplands and Burdekin-Lynd Divide comprise an elevated section of the Great Dividing Range in northeastern Queensland. About twenty avian species of eucalypt forest, woodland and grassland habitats have range gaps, hybrid zones or stepped size-clines in the region of these uplands. Species and species-pairs with a discontinuous or partly discontinuous range include the Lemon-bellied FlycatcherMicroeca flavigaster, Restless FlycatcherMyiagra inquieta, White-gaped HoneyeaterLichenostomus unicolor, Yellow HoneyeaterLichenostomus flavus, Fuscous/Yellow-tinted HoneyeatersLichenostomus fuscus/flavescens, Bar-breasted HoneyeaterRamsayornis fasciatus, Crimson FinchNeochmia phaeton, Star FinchNeochmia ruficaudaand Chestnut-breasted MannikinLonchura castaneothorax.Those with a hybrid zone are the Squatter PigeonPetrophassa (Geophaps) scripta, Pale-headed RosellaPlatycercus adscitus, Brown TreecreeperClimacteris picumnus, Black-chinned HoneyeaterMelithreptus gularis, Striated PardalotePardalotus striatusand Black-throated FinchPoephila cincta.Stepped size-clines or sharp morphological changes occur in the Brown GoshawkAccipiter fasciatus, Barking OwlNinox connivens, Masked OwlTyto novaehollandiae, Tawny FrogmouthPodargus strigoidesand Laughing KookaburraDacelo gigas.Though some of the hybrid zones and steps might have been produced by nearby geographical barriers consisting of low rainfall salients, the upland-divide is an active barrier at present. A cooler climate in the upland-divide now, and presumably in past times, appears to be the cause of present and past range gaps because relevant habitats are continuous throughout north-eastern Queensland. Two taxa,Accipiter fasciatusandMelithreptus gularis, might each be composed of two species; because the small (didimus) and large (fasciatus) forms ofA. fasciatuspossibly both occur in tropical Australia throughout the year rather than only in winter when the large form is presumed to be a southern migrant; and the evidence for hybridization between the altitudinal vicariant formsgularisandlaetioris equivocal. Most geographical barriers between isolated avian populations on the Australian mainland to consist of arid or low-rainfall belts extending to the coast but other cold upland sections of the Great Dividing Range besides the Einasleigh Uplands and Burdekin- Lynd have operated as barriers. These include the McPherson Range and Blue Mountains—Snowy Mountains chain.

ISSN:0158-4197    

DOI:10.1071/MU9860087

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9860111

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9860113

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9860117

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9860118

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9860121

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1080/01584197.1986.11799563

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor