Victorian Pardalotes 153 1961

Total Page:16

File Type:pdf, Size:1020Kb

Victorian Pardalotes 153 1961 December J CHANDLER, Victorian Pardalotes 153 1961 - evident. Although Jacking the black and gold of the male, the female Regent bird is extremely handsome. On one occasion I watched her and the immature birds feeding on the flowers of a clump of pencil-orchids which were growing on a Satin-ash. Within ten minutes they had stripped every bloom from about 30 or 40 orchids. Another highlight of this year's Noosa holiday was the sighting, again in the company of Barbara and Arthur Salter, of a pair of Beach Stone-curlews ( Orthorhamphus magnirostris) on the island just inside the mouth of the Noosa River. There is little doubt that this would be the pair sighted during the 1958 R .A.O .U. Camp-out and which had their egg washed away by a king-tide. They were again seen in the same place on the island but there was little sign of nesting activity; probably it was too early. Some excellent views of the birds were obtained and the most noticeable points were the large size, the heavy bill, the eye-streak and bar on the wing and the bobbing motion when agitated. When first seen the birds reminded me strongly of a small bustard in gait and general appearance. Since the submission of this paper, advice has been received from Mrs. Essie Green, that a Noisy Pitta in Noosa National Park had been killed by a cat. This bird was probably the " tame" one observed by Mr. Peddie. It is to be hoped that its mate will manage to find another partner, or the Noisy Pitta may indeed disappear from this delightful Park. Victorian Pardalotes By L. G . CHANDLER, Red Cliffs, Victoria The changing of the names of birds through the so-called law of priority, or, occasionally, by the re-examination of a type speci­ men held in a museum, makes the study of birds rather confusing for the student of ornithology. The reading of old literature on the subject in check-lists, books, scientific or popular magazines and newspapers will give the beginner in the study of ornithology many headaches before he would be able to finally work out the correct name for some species. However, the lively little Pardalotes of the treetops, of which five species are found in Victoria - two of them spotted and three striated - go their way quite unworried by the ink that has been spilt about them. I would write here of their charm, and register a hope that their names will not undergo another change before this article is in print. Several of the species are known by the local name of Diamond­ bird, and in Leach's first edition of An Australian Bird Book they are called Diamond-birds. In the latest edition, edited by P . Crosbie Morrison, the name Pardalote is substituted. To make it more confusing two of the birds are listed under the scientific name of Pardalotus 'Omatus. The common name now recognised fo r one - species, the Striated Pardalote, was the Red-tipped in the book. 154 CHANDLER, Victorian Pardalotes [ Bird Watcher The bird now known as the Yellow-tipped - one of its original names - was called the Striated Pardaloi:e in the new edition. The range of the three Pardalotes with striated feathers on the head extends far beyond Victoria, and in many places they overlap. These are the Striated, the Eastern Striated and the Yellow-tipped Pardalotes. The Yellow-tipped is the only one of the trio that is found in Tasmania. Its range also extends along the eastern side of the mainland to south-east Queensland. The Striated Pardalote is distributed over most of Australia, while the Eastern Striated species seems to be confined, as the name suggests, to the eastern areas. It is interesting to note that the Striated and the Eastern Striated Pardalotes have been found interbreeding on numerous occasions. Mr. Roy P. Cooper (The Emu, Vol. 61 : pp. 1-6) femnd that of 24 nests that he had under observation in the Maryborough, Vic­ toria, district during November and December, 1959, almost 30 per cent were occupied by an interbreeding pair of birds. Other observers have also noticed this habit and I have a record of the mating of the two species - my only one- as far back as 1909. Since then I have been living in a district where I have not seen the two species together. T he Striated Pardalote is common in the north-west of Victoria although it is becoming rarer each year. When walking through the bush the call note "will-ju" or "wit-e-loo" is often heard. The birds feed largely in the tree-tops and the " tap, tap" of their beaks on the leaves can be heard clearly on a still day. They feed largely on scale insects but all manner of small insects and spiders are added to the bill of fare, as I have noticed when food is brought to the young in a nest. On rare occasions I have seen dozens of these birds in the Red Cliffs district feeding on the ground. It might have been that heavy wind or rain had dislodged some of their normal food supply from the trees. Being accustomed to seeing the birds feeding in the trees it was delightful to watch the dainty sprites at close quarters, hop­ ping about on the ground. The nest of the Striated Pardalote is a semi-domed structure and built of rootlets, grass or bark in a hollow or spout of a tree, or sometimes in a hole in a bank. The nesting site varies from 3 to 25 feet from the ground. The Eastern Striated Pardalote is similar in habits and appearance to the Striated. T he main difference is in the white feathers in the wings. The latter has a broad white patch on the primary feathers and the former a narrow line of white. The Eastern Striated birds seem to favour the banks and creeks to tunnel into to build their nests, but in some areas tree-hollows are readily used. My memories of this species are vivid and pleasant It has an engaging habit of spreading its wings and uttering a soft trilling note if it is disturbed by an observer when it is perched near its nest. They are good subjects for a camera and my first bird photograph was this Pardalote. Going to and from Dr.r.ember J CHANDLER, Victorian Pardalotes 155 1961 - 00 c: "' "'c: 156 ROBINSON, Feeding of Fairy Prions [ Bird Watcher the nest the birds perched on my tripod but I was soon to Jearn that many native birds are not so obliging. With the Yellow-tipped Pardalote we have a distinct species that can be easily recognised, at close quarters, by the small yellow mark on the wings not far from the shoulders. In the tree-tops it is difficult, without the aid of powerful glasses, to distinguish it from the other two species. In habits it is very similar to them also, but I have no records of it interbreeding with them. Without doubt the two spotted species are the most beautiful of the Victorian group of Pardalotes. The Spotted Pardalote is found in the southern, central and eastern portions of Victoria, and also in Tasmania, south-west Australia and through to southern Queens­ land. In my early bird observing days I found numerous nests of the Spotted Pardalote in the banks of Cardinia Creek, Beaconsfield, Victoria. It was a pretty sight to see the little bird pop out of its nesting tunnel through a doorway of maiden-hair fern, while in the flowering silver wattles and gum saplings a few score of Bell­ Miners tinkled their clear bell-like notes incessantly. When I hear a Spotted Pardalote calling now, in fancy, I smell the perfume of wattle and maiden-hair fern, and hear the creek rippling as an undertone to the music of the Bell-Miners. The soft notes of the Spotted Pardalote, which resemble "sleep baby", can often be heard in the tree-tops. I think that the call may be given by both sexes in conjunction, the "baby" being the answering note. Last of all is the Yellow-tailed Pardalote of the Mallee scrubs. It makes a tunnel in the sandy soil and in an enlarged chamber at the end builds its nest. All the Pardalotes lay white eggs and this applies to most birds that nest in hollows. In the dwarf mallee scrub it is an unforgettable sight to come upon one of these beautiful birds feeding on scale insects on the leaves of the gums. It will sometimes allow an observer to approach closely, and in the strong sunlight its lovely colours are seen to advantage. The Feeding of Fairy Prions By LEN N. ROBINSON, Murrumbeena, Victoria Following the rough weather across southern Victoria, a visit was made to Sorrento on July 9, 1961, when it was noticed that numbers of sea-birds had entered Port Phillip Bay (The Bird Observer, August, 1961) . Amongst those birds seen were many hundreds of Fairy Prions (Pachyptila turtur) which were frequently observed to alight on the water and feed on what the observers thought would be plankton. On returning to the Sorrento pier, after spending several hours "sea-bird watching" just inside Port Phillip Heads, a small party of about 40 Prions was observed feeding close to the pier. After disembarking, the four observers sat on the pier for about 30 .
Recommended publications
  • The Role of Habitat Variability and Interactions Around Nesting Cavities in Shaping Urban Bird Communities
    The role of habitat variability and interactions around nesting cavities in shaping urban bird communities Andrew Munro Rogers BSc, MSc Photo: A. Rogers A thesis submitted for the degree of Doctor of Philosophy at The University of Queensland in 2018 School of Biological Sciences Andrew Rogers PhD Thesis Thesis Abstract Inter-specific interactions around resources, such as nesting sites, are an important factor by which invasive species impact native communities. As resource availability varies across different environments, competition for resources and invasive species impacts around those resources change. In urban environments, changes in habitat structure and the addition of introduced species has led to significant changes in species composition and abundance, but the extent to which such changes have altered competition over resources is not well understood. Australia’s cities are relatively recent, many of them located in coastal and biodiversity-rich areas, where conservation efforts have the opportunity to benefit many species. Australia hosts a very large diversity of cavity-nesting species, across multiple families of birds and mammals. Of particular interest are cavity-breeding species that have been significantly impacted by the loss of available nesting resources in large, old, hollow- bearing trees. Cavity-breeding species have also been impacted by the addition of cavity- breeding invasive species, increasing the competition for the remaining nesting sites. The results of this additional competition have not been quantified in most cavity breeding communities in Australia. Our understanding of the importance of inter-specific interactions in shaping the outcomes of urbanization and invasion remains very limited across Australian communities. This has led to significant gaps in the understanding of the drivers of inter- specific interactions and how such interactions shape resource use in highly modified environments.
    [Show full text]
  • Eastern Australia: October-November 2016
    Tropical Birding Trip Report Eastern Australia: October-November 2016 A Tropical Birding SET DEPARTURE tour EASTERN AUSTRALIA: From Top to Bottom 23rd October – 11th November 2016 The bird of the trip, the very impressive POWERFUL OWL Tour Leader: Laurie Ross All photos in this report were taken by Laurie Ross/Tropical Birding. 1 www.tropicalbirding.com +1-409-515-9110 [email protected] Page Tropical Birding Trip Report Eastern Australia: October-November 2016 INTRODUCTION The Eastern Australia Set Departure Tour introduces a huge amount of new birds and families to the majority of the group. We started the tour in Cairns in Far North Queensland, where we found ourselves surrounded by multiple habitats from the tidal mudflats of the Cairns Esplanade, the Great Barrier Reef and its sandy cays, lush lowland and highland rainforests of the Atherton Tablelands, and we even made it to the edge of the Outback near Mount Carbine; the next leg of the tour took us south to Southeast Queensland where we spent time in temperate rainforests and wet sclerophyll forests within Lamington National Park. The third, and my favorite leg, of the tour took us down to New South Wales, where we birded a huge variety of new habitats from coastal heathland to rocky shorelines and temperate rainforests in Royal National Park, to the mallee and brigalow of Inland New South Wales. The fourth and final leg of the tour saw us on the beautiful island state of Tasmania, where we found all 13 “Tassie” endemics. We had a huge list of highlights, from finding a roosting Lesser Sooty Owl in Malanda; to finding two roosting Powerful Owls near Brisbane; to having an Albert’s Lyrebird walk out in front of us at O Reilly’s; to seeing the rare and endangered Regent Honeyeaters in the Capertee Valley, and finding the endangered Swift Parrot on Bruny Island, in Tasmania.
    [Show full text]
  • Where Do All the Bush Birds Go?
    Australian Bird Count WHERE DO ALL THE BUSH BIRDS GO? In 1989 the RAOU embarked on one of the most ambitious bird counting projects undertaken in Australia – the Australian Bird Count. Now the analysis of the enormous volume of data is beginning to reveal the seasonal movements of our bush birds – including some surprises. by Michael F. Clarke, Peter Griffioen and Richard H. Loyn Supplement to Wingspan, vol. 9, no. 4, December 1999 ¢ ii Australian Bird Count The Australian Bird Count relied on the participation of a dedicated band of volunteers throughout the country. Photo by Jane Miller Inset: The ABC is helping to clarify the seasonal distribution of species that migrate southward from the tropics in summer, such as the Fairy Martin. Photo by Graeme Chapman EVEN A CASUAL OBSERVER KNOWS that the abundance of different bird species changes over time and space. What is less obvious is how changes at individual sites fit in with a continental picture of bird movements. By the early 1980s it was becoming increasingly clear that species and ecosystems could not be properly managed without an understanding of these movements. Thus it was that in the mid-1980s the RAOU’s best method to introduce in Australia.1,2 Four Research Committee decided to embark on an methods were selected for field testing,3 which ambitious Australia-wide project to gather bird showed that active methods (transects or area count data in a consistent and scientific manner. searches) detected more individual birds and species At that time there were already several monitoring in 20 minutes than stationary methods.
    [Show full text]
  • A Glovebox Guide Greening Australia
    n A GLOVEBOX GUIDE GREENING AUSTRALIA n A GLOVEBOX GUIDE GREENING AUSTRALIA bringing birds back acknowledgements A glovebox GUIDE FOR BIRD IDENTIFICation Greening Australia Would like & Habitat restoration IN THE ACT & SE NSW to THank: PROJECT TEAM: Sue Streatfield, Nicki Taws & • All landholders for their commitment to habitat Haydn Burgess restoration, and for making their properties available for bird surveys AUTHOR: Nicki Taws • Sue Streatfield for conceiving and developing ContributORS: Suzi Bond & Toby Jones the Birdwatch project INFormation SOURCES: • Nicki Taws for making the project happen, drawing Pizzey, G. and Knight, F. 2003. The Field Guide the data together and writing the Bringing Birds to Birds of Australia 7th ed. Back publication Schodde, R. and Tidemann, S.C. (eds.) 1986. • C anberra Ornithologists Group and associated Reader’s Digest Complete Book of Australian Birds. volunteers, including Barbara Allan, Tony Daukus, PHotos: Dianne Deans, Mike Doyle, Ken Freeman, Roger Helen Fallow: Yellow-rumped Thornbill, Crimson Freney, Malcolm Fyfe, Julie McGuiness, Martyn Rosella, Australian Magpie, Willie Wagtail, White- Moffat, John Reynolds, Graham and Helen plumed Honeyeater, European Goldfinch, White-browed Stephinson, Nicki Taws and Richard Webb for Scrubwren, Australian Raven, Blackbird, Scarlet Robin, contributing their highly skilled birdwatching efforts Speckled Warbler, Diamond Firetail, Hooded Robin, • Special thanks to Malcolm Fyfe and Barbara Allan Southern Whiteface, White-throated Treecreeper, for their unwavering
    [Show full text]
  • 5Th Australasian Ornithological Conference 2009 Armidale, NSW
    5th Australasian Ornithological Conference 2009 Armidale, NSW Birds and People Symposium Plenary Talk The Value of Volunteers: the experience of the British Trust for Ornithology Jeremy J. D. Greenwood, Centre for Research into Ecological and Environmental Modelling, The Observatory, Buchanan Gardens, University of St Andrews, Fife KY16 9LZ, Scotland, [email protected] The BTO is an independent voluntary body that conducts research in field ornithology, using a partnership between amateurs and professionals, the former making up the overwhelming majority of its c13,500 members. The Trust undertakes the majority of the bird census work in Britain and it runs the national banding and the nest records schemes. The resultant data are used in a program of monitoring Britain's birds and for demographic analyses. It runs special programs on the birds of wetlands and of gardens and has undertaken a series of distribution atlases and many projects on particular topics. While independent of conservation bodies, both voluntary and statutory, much of its work involves the provision of scientific evidence and advice on priority issues in bird conservation. Particular recent foci have been climate change, farmland birds (most of which have declined) and woodland birds (many declining); work on species that winter in Africa (many also declining) is now under way. In my talk I shall describe not only the science undertaken by the Trust but also how the fruitful collaboration of amateurs and professionals works, based on their complementary roles in a true partnership, with the members being the "owners" of the Trust and the staff being responsible for managing the work.
    [Show full text]
  • Common Urban Birds
    Common Urban Birds Crested Pigeon Spotted Turtle Dove* Feral Pigeon* Noisy Miner New Holland Eastern Spinebill White-plumed Honeyeater Honeyeater JS SW SW SW SW JS JS (Crest on head) (White spots on neck) (Dark grey feathers usually with a (Black head, yellow around eyes) (Black and yellow wings, Black and (Black, white and reddish-brown (White lines on neck) shiny green neck) white striped chest) feathers) Nectarivore & Granivore Granivore Granivore Nectarivore & Insectivore Nectarivore & Insectivore Nectarivore & Insectivore q q q q Insectivore,Omnivore q q q X Ground X Trees,Shrubs,Ground X Ground X Trees,Shrubs,Ground,Air X Trees,Shrubs,Air X Shrubs,Air X Trees,Shrubs,Ground,Air Red Wattlebird Little Wattlebird Striated Pardalote Welcome Swallow House Sparrow* Silvereye Willie Wagtail JS SW JH SW JMG JT JS (Yellow-orange belly, red wattles) (No orange on belly, no wattles) (Yellow face, black & white (Flies around ovals and other (Very small) (Silver ring around eye) (Black and white, tail wags from streaked crown, white wing streaks grassed areas, forked tail) side to side) with red spot) Nectarivore & Nectarivore & Insectivore Nectarivore & Insectivore Insectivore Granivore Omnivore Insectivore q q q Insectivore,Insectivore q q q q X Trees,Shrubs,Air X Trees,Shrubs,Air X Trees,Shrubs X Air X Ground X Trees,Shrubs X Ground,Air Common Blackbird* Common Starling* Australian Magpie Magpie-lark Little Raven Laughing Nankeen Kestrel Kookaburra JS JS JG JS JS JG JS (Smaller beak and body than (Breeding male black with bright yellow (Dark
    [Show full text]
  • Natural Values of the TWWH 2013 Extension
    Natural Values of the Tasmanian Wilderness World Heritage Area 2013 Extension - Central North Sector Nature Conservation Report 20/3 DeparNaturalt mentand Cultural of Heritage PrDepartmentimaryNatural Industr of Values Primaryies, PaSurveyrk Industries,s, W• 2013ater TWWHA Parks,and En Water vExtensionironmen And Area, tEnvironment Central North Sector 1 Natural Values of the TWWHA Extension - Central North Sector Edited by Elise Dewar Document design by Land Tasmania Design Unit © Department of Primary Industries, Parks, Water and Environment This report was prepared under the direction of the Natural and Cultural Heritage Division of the Department of Primary Industries, Parks, Water and Environment (Tasmanian Wilderness World Heritage Program). Australian Government funds contributed to the project. The views and opinions expressed in this report are those of the authors and do not necessarily reflect those of the Australian Governments. ISSN: 1838-7403 (electronic) Front cover photograph by Micah Visoiu; overlooking the headwaters of Brumby Creek in the TWWHA Cite as: DPIPWE (2020). Natural values of the Tasmanian Wilderness World Heritage Area 2013 Extension – Central North Sector. Nature Conservation Report 20/3, Department of Primary Industries, Parks, Water and Environment, Hobart Natural Values Survey • 2013 TWWHA Extension Area, Central North Sector 2 KEY FINDINGS In 2013, an area of 172,276 ha was added to the Tasmanian Wilderness World Heritage Area (TWWHA). A review of the known natural values for this extension and the threats to those values highlighted significant knowledge gaps (Balmeret al., 2017). To redress these knowedge gaps, at least partially, a multi-disciplinary survey was undertaken in November 2019 to document flora, fauna and geodiversity values in part of the extension area known as the Central North Sector (CNS).
    [Show full text]
  • Australian Magpie Crested Bellbird Australian Raven Crested Pigeon
    This list of species in Wandoo Woodlands was compiled from various pieces of data for Bob Huston (Nature Conservation Coordinator – Perth Hills District) by Belinda Milne LIST 1 * = Introduced to Western Australia Australian magpie Crested bellbird Australian raven Crested pigeon Barn owl Domestic pigeon* Black-capped sitella Dusky woodswallow Black-eared cuckoo Elegant parrot Black-faced cuckoo shrike Emu Black-faced woodswallow Fan-tailed cuckoo Black-shouldered kite Galah Blue-breasted fairy-wren Golden whistler Boobook owl Grey butcherbird Broad-tailed thornbill Grey currawong Brown falcon Grey fantail Brown goshawk Grey shrike-thrush Brown honeyeater Hooded robin Brown-headed honeyeater Horsfield’s bronze cuckoo Brown quail Jacky winter Bush stone-curlew Laughing kookaburra* Carnaby’s cockatoo Laughing turtledove* Crested shrike-tit Little wattlebird Common bronzewing Long -billed corella Magpie-lark Silvereye Major Mitchell’s cockatoo Singing honeyeater Malleefowl Splendid fairy-wren Mistletoe bird Striated pardalote Nankeen kestrel Stubble quail New Holland honeyeater Tawny-crowned honeyeater Owlet nightjar Tawny frogmouth Pallid cuckoo Tree martin Painted button quail Wedge-tailed eagle Peregrine falcon Weebill Pied butcherbird Western rosella Port Lincoln/ringneck parrot Western spinebill Purple-crowned lorikeet Western thornbill Rainbow bee-eater Western warbler Red-capped parrot Western yellow robin Red-capped robin White-browed babbler List 1 Continued Red-tailed black cockatoo White-browed scrubwren Red wattlebird White-cheeked
    [Show full text]
  • Strathfieldsaye Estate Monitoring. Report by Chris Healey
    STRATHFIELDSAYE ESTATE BIRD MONITORING PROJECT: INTERIM REPORT FOR 2018 Chris Healey and Brian Martin INTRODUCTION: This is a preliminary report on the first twelve months of a project to monitor the diversity and abundance of birds of the Strathfieldsaye Estate grazing property on the shore of Lake Wellington at Perry Bridge, East Gippsland. We anticipate being able to release a more detailed report early in 2019. In late 2017 BirdLife East Gippsland (BLEG) was invited by the Australian Landscape Trust (ALT) to undertake regular bird monitoring surveys of their Strathfieldsaye Estate property at Perry River. The estate is a historic property established in the late 19th century,and bequeathed by the late Dr Clive Disher to the University of Melbourne. Ownership was transferred subsequently to the ALT, which manages the property as an ecologically sustainable organic grazing property. The bird surveys form a part of a larger fauna survey initiative of the ALT with Victorian government funding under the 'Bio-diversity On-ground Action – Community and Volunteer Action’ program. The bird survey program was established in consultation with Ms Madeline Watts, Ecologist with ALT, and overall project manager. The estate covers approximately 2000 hectares, and includes a heritage listed homestead and farm outbuildings. It also includes a ‘bombing range’ used as a training facility by the RAAF during World War Two (the ‘bombs’ consisted of flour bags!) While most of the property has been cleared of the original Red Gum grassy plains vegetation, significant remnants remain, along with several other threatened vegetation communities. The ALT has sought to protect and restore native vegetation through stock exclusion of selected areas and management of the large numbers of Grey Kangaroos.
    [Show full text]
  • Parasite Impacts of 40 Spotted Pardalote
    Animal Conservation. Print ISSN 1367-9430 Native fly parasites are the principal cause of nestling mortality in endangered Tasmanian pardalotes A. B. Edworthy1 , N. E. Langmore1 & R. Heinsohn2 1 Research School of Biology, Australian National University, Canberra, ACT, Australia 2 Fenner School of Environment and Society, Australian National University, Canberra, ACT, Australia Keywords Abstract forty-spotted pardalote; host–parasite relationship; myiasis; parasitic fly; Established host–parasite interactions at an evolutionary equilibrium are not pre- Passeromyia longicornis; striated pardalote; dicted to result in host population decline. However, parasites may become a major nestling mortality; ectoparasites. threat to host species weakened by other factors such as habitat degradation or loss of genetic diversity in small populations. We investigate an unusually virulent Tas- Correspondence manian ectoparasite, Passeromyia longicornis, in its long-term hosts, the endan- Amanda Edworthy, Department of gered forty-spotted pardalote (Pardalotus quadragintus) and striated pardalote Entomology, Washington State University, (Pardalotus striatus) in southeastern Tasmania, Australia. We conducted a parasite 100 Dairy Road, Pullman, WA 99164, USA. elimination experiment to determine the net effect of parasites on forty-spotted par- Tel: 1-971-232-7248; dalote nestling mortality, and monitored nestling parasite load and mortality in Email: [email protected] forty-spotted and striated pardalote nestlings during two breeding seasons (Aug– Jan, 2013–2015). Passeromyia longicornis larvae killed 81% of all forty-spotted Editor: John Ewen pardalotes nestlings. Across 2 years, forty-spotted pardalotes fledged fewer nest- lings (18%) than sympatric striated pardalotes (26%), and this difference was gen- Received 25 February 2018; accepted 17 erated by a combination of higher parasite load and virulence in forty-spotted July 2018 pardalote nests.
    [Show full text]
  • Spatial Variation in Avian Bill Size Is Associated with Humidity in Summer Among Australian Passerines Janet L
    Gardner et al. Climate Change Responses (2016) 3:11 DOI 10.1186/s40665-016-0026-z RESEARCH Open Access Spatial variation in avian bill size is associated with humidity in summer among Australian passerines Janet L. Gardner1*, Matthew R. E. Symonds2, Leo Joseph3, Karen Ikin4, John Stein4 and Loeske E. B. Kruuk1 Abstract Background: Climate imposes multiple selection pressures on animal morphology. Allen’s Rule proposes that geographic variation in the appendage size of endotherms, relative to body size, is linked to climatic variation, thereby facilitating heat exchange and body temperature regulation. Thus relatively larger appendages tend to be found in animals in warmer climates. Despite growing understanding of the role of the avian bill as an organ for heat exchange, few studies have tested the ecological significance of bill size for heat dissipation across species and environmental gradients. Amongst those that have, most have focused on the relationship with ambient temperature, but there is growing evidence that humidity also has a strong influence on heat dissipation. In particular, increasing humidity reduces the potential for evaporative cooling, favouring radiative and convective heat loss via the bill, and hence potentially favouring larger bills in humid environments. Here, we used phylogenetically-controlled analyses of the bill morphology of 36 species of Australian passerines to explore the relationship between bill size and multiple aspects of climate. Results: Humidity during the hot summer months (December-February) was positively associated with relative bill surface area across species. There was no overall association between bill size and summer temperatures per se, but the association with humidity was mediated by temperature, with a significant interaction indicating stronger associations with humidity at cooler summer temperatures.
    [Show full text]
  • The Noisy Native: a Miner Menace? Noisy Miner Habitat Preferences and Influence on Woodland Bird Species Richness
    The noisy native: a miner menace? Noisy miner habitat preferences and influence on woodland bird species richness Sarah Chubb Submitted in partial fulfilment of the requirements for the degree of Bachelor of Science with Honours in the Fenner School of Environment and Society, Australian National University November 2011 ii Candidate's Declaration This thesis contains no material which has been accepted for the award of any other degree or diploma in any university. To the best of the author’s knowledge, it contains no material previously published or written by another person, except where due reference is made in the text. Sarah Constance Chubb Date Sarah Chubb The noisy native: a miner menace? iii Acknowledgements This project has let me immerse myself in a topic that I have been passionate about – and I have come out of it thoroughly inspired. My inspiration has largely come from the people who have supported and nurtured my learning experiences, without whom this project would not have been possible! To my supervisors, Chris McElhinny and Julian Reid, many thanks for all of your guidance and support over the past 9 months. You have helped me to shape my research, and thesis, and have provided me with the encouragement and enthusiasm that helped me to sustain my interest (and energy) throughout the year. Thank-you Chris, for being such a wonderful teacher over the past 3 years. You are an inspiration to me. Without the support and funding of the Cowra Woodland Birds Program, this project could not have happened. John and Madeline Rankin, Neale and Janeen Coutanche, Malcolm Fyfe, Maret Vesk and Rosemary Stapleton have been so encouraging and made me feel so welcome in Cowra.
    [Show full text]