Chapter 5 Feeding Ecology of the Australian Raven on Rottnest Island

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irds can be assessed to confirm that <strong>the</strong>y are recovering in response to habitat restoration programs. ii
Contents Acknowledgements vii <strong>Chapter</strong> 1 Introduction 1 1.1 What are bush birds? 2 1.2 Why is <strong>the</strong> <strong>Australian</strong> <strong>Raven</strong> a pest? 3 1.3 Research questions 4 <strong>Chapter</strong> 2 Terrestrial Avifauna <strong>of</strong> Rottnest Island 7 2.1 Introduction and Aims 7 2.1.1 Geography and geology 7 2.1.2 History 8 2.1.3 Vegetation 9 2.2 Methods 15 2.2.1 Literature review 15 2.2.2 Study area and observations 15 2.3 Results 17 2.3.1 History <strong>of</strong> Rottnest Avifauna 17 Decreases 17 Increases 22 2.3.2 Species <strong>of</strong> conservation concern 23 2.3.3 Distribution and abundance <strong>of</strong> bush birds 23 2.4 Discussion 26 <strong>Chapter</strong> 3 Biology and <strong>Ecology</strong> <strong>of</strong> <strong>the</strong> <strong>Australian</strong> <strong>Raven</strong> on Rottnest Island 29 3.1 Introduction and Aims 29 3.1.1 Taxonomy <strong>of</strong> <strong>Australian</strong> corvids 29 3.1.2 Life history <strong>of</strong> <strong>the</strong> <strong>Australian</strong> <strong>Raven</strong> 30 3.1.3 The <strong>Australian</strong> <strong>Raven</strong> as a pest 31 3.1.4 History <strong>of</strong> ravens on Rottnest Island 32 3.2 Methods 33 3.2.1 Field observation 33 3.2.2. Laboratory analysis 34 3.3. Results 37 3.3.1 Distribution and abundance 37 3.3.2 Behaviour and activity 40 3.3.3 Breeding 41 iii
Page 1: Ecological Impacts of</stro
Page 5: Abstract The Australian</st
Page 9 and 10: 5.2.2 Laboratory examination <stron
Page 11 and 12: Acknowledgements My sincerest thank
Page 13 and 14: Chapter 1 Introduc
Page 15 and 16: 1.2 Why is the <st
Page 17: Chapter 5 Investig
Page 20 and 21: 2.1.2 History Archaeological eviden
Page 22 and 23: Figure 2.1: Rottnest Island in rela
Page 24 and 25: Figure 2.2b: Rottnest Island with t
Page 26 and 27: Early observers did not document <s
Page 29 and 30: 2.2 Methods 2.2.1 Literature review
Page 31 and 32: 2.3 Results 2.3.1 History o
Page 33 and 34: Genus species Common Name Habitat S
Page 35 and 36: Gerygone fusca Western Gerygone W R
Page 37 and 38: Increases Twelve species have incre
Page 39 and 40: diversity (Figure 2.5). These sites
Page 41 and 42: 13 Figure 2.5: Combned monthly freq
Page 43 and 44: some species, but causing t
Page 45 and 46: smaller in size than the</s
Page 47 and 48: Pest Management Plan, with 180 indi
Page 49 and 50: within the settlem
Page 51 and 52: Figure 3.1: Age characteristics <st
Page 53 and 54: highest daily frequency of<
Page 55 and 56: individuals in the
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pair of Osprey als
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There were a higher number
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and multiple nests support
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Chapter 4 Nest Pre
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4.1.3 Hypothesis t
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To reduce the impa
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The outside of <st
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Five nests, one of
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4.2.8 Control - naturally occurring
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Total Settlement (a) Nests SITE 1 5
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Figure 4.4: Linear regression test
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This can be explained by th
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Chapter 5
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conducted in 2011 (May - September)
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Figure 5.1: Sources of</str
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Figure 5.2: Raven
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Food Category (i) Seed/Plant Grit/
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Initially, culling was conducted at
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settlement for foraging, roosting a
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6.3 Recommendations for future rese
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Given that several bush bird specie
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Program may already be influencing
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Appendices Appendix I Characteristi
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49 2 B 49 11/10/2010 GW Exposed YES
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101 5 C 101 8/11/2010 LTD Exposed Y
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Appendix II Summary: Nest predation
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Appendix IV Summary: Nest predation
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References Alexander, W.B. (1921).
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Burbidge, A.A. (2010). Australia’
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Glauert, L. (1929). Contributions t
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Major, R.E., Pyke, G.H., Christy, M
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Ricklefs, R.E. (1969). An analysis
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Skutch, A.F. (1966). A breeding bir
Page 127:
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Chapter 5 Feeding Ecology of the Australian Raven on Rottnest Island

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