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Canberra Bird Notes Cbn@Canberrabirds.Org.Au Cogoffice@Canberrabirds.Org.Au canberra ISSN 0314-8211 Volume 31 Number 4 bird December 2006 notes Registered by Australia Post — Publication No. NBH 0255 CANBERRA ORNITHOLOGISTS GROUP PO Box 301 Civic Square ACT 2608 2006-07 Committee President Jack Holland 6288 7840 (h) Vice-President Chris Davey 6254 6324 (h) Secretary Sandra Henderson 6231 0303 (h) Treasurer Lia Battisson 6231 0147 (h) Conservation Jenny Bounds 6288 7802 (h) Field trips Anthony Overs 6254 0168 (h) Newsletter Sue Lashko 6251 4485 (h) Webmaster David Cook 6236 9153 (h) Member Tony Lawson 6161 9430 (h) Email contacts Website www.canberrabirds.org.au Canberra Bird Notes [email protected] [email protected] [email protected] Gang-gang monthly newsletter [email protected] GBS coordinator David Rosalky 6273 1927 (h) [email protected] Unusual bird reports [email protected] [email protected] Other COG contacts Databases Paul Fennell 6254 1804 (h) Rarities Panel Barbara Allan 6254 6520 (h) Records officer Nicki Taws 6251 0303 (h) Sales Carol Macleay 6286 2624 (h) Waterbird survey Michael Lenz 6249 1109 (h) COG no longer operates an office in the Griffin Centre. If members wish to access the library, please contact Barbara Allan on 6254 6520; to borrow equipment, please contact the field trips officer. Canberra Bird Notes 31 (4) December 2006 THE STATUS OF HOODED ROBINS IN THE HALL TO NEWLINE WOODLAND CORRIDOR Jenny Bounds PO Box 403, Woden, ACT 2606 Abstract. This article documents the occurrence and abundance of Hooded Robins Melanodryas cucullata in what is regarded as the largest woodland corridor in the ACT from Hall to Newline. It draws largely on information from the COG Woodland Project and COG databases and discusses the status of the Hooded Robin in that corridor. The latest data analysis from the COG Woodland Project, which has eight survey locations in the corridor (86 monitoring points), shows a worrying trend for Hooded Robin, a significant decreasing trend in occupancy (detection) rate. Background The corridor contains the largest area of The Hall to Newline woodland corridor endangered Yellow Box Eucalyptus is a relatively extensive area of melliodora and Red Gum E. blakelyi woodland and dry forest which forms ecological community in the ACT and the landscape backdrop for the northern has, for the most part, good connectivity part of the ACT. This corridor runs values for birds generally, although from around Hall Cemetery to the there are areas where these linkages Newline Quarry woodland and could be improved on ground. For Molonglo River. The grassy woodland example, the narrow link between mosaic in the corridor, some of which is Mulligans Flat and Goorooyarroo largely unmodified, is broadly Reserves is regarded as inadequate, representative of the landscape which especially if the proposed suburb of once covered much of sub-coastal Throsby goes ahead as on the plan. South-east Australia, and is recognised Also, the links between the Newline in the ACT Lowland Woodland woodland, Molonglo River and Conservation Strategy as one of the woodlands in the Jerrabomberra Valley largest areas of contiguous woodland in need to be improved (Environment ACT the ACT (Environment ACT 2004). 2004). This relatively extensive area of The Corridor comprises two large woodland contributes significantly to woodland complexes, Gungahlin (4435 the landscape pattern by size and ha) and Majura-Kowen (4900 ha), and connectivity, potentially linking with includes Hall Cemetery, Hall and other key woodland corridors in the environs, the Kinlyside woodlands ACT (Callum Brae-Jerrabomberra in adjacent to Hall (currently leaseholds), central Canberra) and into rural areas of wooded and forested slopes and ridges adjacent NSW, thus providing important in north and central Gungahlin running access from the north, particularly for around the northern border of the ACT more mobile species of birds with NSW (largely hills, ridges and (Environment ACT 2004). buffers under the ACT Territory Plan), 169 Canberra Bird Notes 31 (4) December 2006 the Mulligans Flat and Goorooyarroo Locally, the Hooded Robin is known to Nature Reserves, the Mt Majura and Mt be restricted to habitats away from the Ainslie Nature Reserves, Campbell Park urban areas, that contain a mixture of woodlands, woodlands and grasslands in woodland and grassland, with trees for and around the Majura Field Firing protective cover, areas of open grass for Range, the Kowen Forest area and the feeding (with insects and invertebrates), Newline woodland (Environment ACT perching sites from which to forage and 2004). suitable trees with cover for nesting (Graham 1990). The corridor supports habitat for the eight bird species listed in the ACT as In his study across 72 woodland threatened (vulnerable or endangered remnants in and around the ACT for status) under the Nature Conservation Greening Australia's Vegetation Act 1980, another four bird species of Investment Project, Freudenberger concern under a 'watching brief, as found that the Hooded Robin was the well as other rare or uncommon most 'sensitive' or demanding bird woodland birds (Environment ACT species (the focal species), requiring 2004). All twelve species of birds on structurally complex habitat patches the ACT listing have been recorded in greater than 100 hectares, that are within the corridor. Some of these species, for about 1000 metres of other patches example the Hooded Robin (Freudenberger 1999). Melanodryas cucullata, are known to require large, well-connected and Based on COG database records and complex-structured woodland patches anecdotal information from the (Freudenberger 1999). coordinators of COG Woodland Project surveys at locations in the corridor, it is Discussion estimated there are only four to six Hooded Robin territories in the whole of It is known from COG's Woodland the Mulligans Flat/Goorooyarroo Nature Project surveys and other records, that Reserve complex of around 1500 there are small groups of Hooded hectares - possibly two territories in Robins resident within the Hall to Mulligans Flat on the eastern side of the Newline corridor. Although COG does reserve, and two to three territories in not undertake surveys across all areas of nearby Goorooyarroo, only in the the woodland corridor, surveys at eight northern part of the reserve. There are locations in representative areas of good possibly only one or two territories in quality grassy woodland (total of 86 the Kinlyside woodlands near Hall monitoring points), indicate that small (though the current status is uncertain) groups of Hooded Robins are clustered and possibly two to three territories in in particular areas, where the habitat is the Majura Field Range (N Taws, A apparently most favourable to them, but Rowell pers comm, J Bounds pers obs.) are not widespread (COG Databases, Cunningham and Rowell 2006). Why Hooded Robins do not occur more widely in these very large woodland areas is not clear. What is known is that 170 Canberra Bird Notes 31 (4) December 2006 the right mix of habitat structures for the foot of Mt Ainslie, and is known to nesting and shelter, with tree and shrub occur in only two Woodland Project cover, eucalypt re-growth and open locations in the corridor, Majura Field feeding areas, appears to be very Firing Range and Newline (COG important for Hooded Robins to persist Databases). and breed successfully. The experimental research being Hooded Robins used to occur in places conducted in the Mulligans Flat and like Black Mountain and Mt Mugga Goorooyarroo Reserves by the Mugga, but are no longer found in these Australian National University/CRES areas close to urban Canberra (Graham and the ACT Government should assist 1995, COG Databases). Urban-related in better understanding the resident bird impacts from a large and growing populations, their habitat preferences Gungahlin community adjacent to much and the long-term conservation and of the corridor, especially the Mulligans management needs, especially for Flat and Goorooyarroo Nature Reserves, highly sensitive species like the Hooded are an emerging issue for birds and Robin. other fauna, as there is likely to be increased use of the reserves for The latest data analysis from the COG recreational purposes. There are likely Woodland Project, from surveys to be impacts from a variety of other conducted between 1998 to 2005, factors such as feral predators (foxes indicates that the Hooded Robin is and roaming cats), climate related decreasing in occupancy rate (detection factors, drought, kangaroo grazing etc. rate) across the Project's fourteen locations, a 24% change in occupancy Maybe the 'extinction debt', the final rate (Bounds, Cunningham and Taws, outcome of land clearance and 2007, in press). In the previous analysis fragmentation and other factors which of Woodland Project data to the end of reduces some bird populations to small, 2004, the trend for Hooded Robins was isolated groups and eventual extinction, listed as uncertain, needing more years' is almost played out with respect to this data to clarify the trend (Cunningham remaining woodland corridor. Have and Rowell 2006). Hooded Robins reduced to such low numbers in the corridor and are able to Eight of the fourteen COG Woodland persist as breeding groups only in the Project locations are in the corridor, of most optimum habitat patches within the which five of those locations have larger woodland complexes? The recorded Hooded Robins, although the Brown Treecreeper Climacteris
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