title: Can redirected aggression explain interspecific attacks by Australian magpies on other birds?

authors: Morgan, Dai K.J.

subjects: agonistic behaviour

abstract: Attacks by participants of conflicts against a third party are referred to as redirected aggression. Usually the third party is a conspecific — few documented cases of redirected aggression against other species exist. The Australian magpie (Gymnorhina tibicen), however, often attacks other species; the reasons for attacks are largely unknown. Some attacks occur after territorial disputes with conspecifics, suggesting that attacks are the result of redirected aggression. We subjected eight Australian magpie groups to simulated territorial intrusions. In one treatment an Australian magpie and rock dove (Columba livia) were presented in cages next to one another (5 m apart) on the territory for 30 min; the Australian magpie decoy was then covered and aggressive responses toward the rock dove by residents were recorded for a further 30 min (Treatment 1). Two additional treatments were presented in an identical manner on each territory where both decoys were either Australian magpies (Treatment 2) or rock doves (Treatment 3). We predicted that if Australian magpies regularly redirect aggression onto benign species after conspecific territorial intrusions, attack rates on the rock dove decoy in Treatment 1 would be higher than attack rates on the rock dove decoy in Treatment 3. Residents were seldom recorded close (<1 m) and not seen attacking rock dove decoys during tests. In contrast, Australian magpie decoys were often approached and attacked by residents. After a decoy was covered (following the first 30 min phase), residents spent little time in close proximity (on cage, <0.3 m, or 0.3-1 m) to the rock dove decoy in either Treatment 1 or Treatment 3; in contrast, residents were often recorded close to the Australian magpie decoy in Treatment 2. We found no evidence that Australian magpies redirect aggression onto other birds after territorial intrusions. The true proportion of territorial disputes leading to redirected attacks may be small, or only occur under highly specific contexts.

text: Can redirected aggression explain interspecific attacks by Australian magpies on other birds? Attacks by participants of conflicts against a third party are referred to as redirected aggression. Usually the third party is a conspecific — few documented cases of redirected aggression against other species exist. The Australian magpie (Gymnorhina tibicen), however, often attacks other species; the reasons for attacks are largely unknown. Some attacks occur after territorial disputes with conspecifics, suggesting that attacks are the result of redirected aggression. We subjected eight Australian magpie groups to simulated territorial intrusions. In one treatment an Australian magpie and rock dove (Columba livia) were presented in cages next to one another (5 m apart) on the territory for 30 min; the Australian magpie decoy was then covered and aggressive responses toward the rock dove by residents were recorded for a further 30 min (Treatment 1). Two additional treatments were presented in an identical manner on each territory where both decoys were either Australian magpies (Treatment 2) or rock doves (Treatment 3). We predicted that if Australian magpies regularly redirect aggression onto benign species after conspecific territorial intrusions, attack rates on the rock dove decoy in Treatment 1 would be higher than attack rates on the rock dove decoy in Treatment 3. Residents were seldom recorded close (<1 m) and not seen attacking rock dove decoys during tests. In contrast, Australian magpie decoys were often approached and attacked by residents. After a decoy was covered (following the first 30 min phase), residents spent little time in close proximity (on cage, <0.3 m, or 0.3-1 m) to the rock dove decoy in either Treatment 1 or Treatment 3; in contrast, residents were often recorded close to the Australian magpie decoy in Treatment 2. We found no evidence that Australian magpies redirect aggression onto other birds after territorial intrusions. The true proportion of territorial disputes leading to redirected attacks may be small, or only occur under highly specific contexts.

year: 2007

title: Colonial geographies of settlement: Vegetation, towns, disease and well-being in Aotearoa/New Zealand, 1830s-1930s

authors: Beattie, James John

subjects: environment

abstract: A Fruitful new area of environmental history research can be undertaken on the relationship between plants and health in colonial societies. By using New Zealand as a case study, I demonstrate the strength of settler beliefs in the connections between existing environments, environmental transformation, and their own health. I attempt to reconnect the historiographies of medical and environmental history by arguing that urban settlements- as much as rural areas – were important sites for debates about environmental change and human health. I adopt a broad perspective in order to sketch out the contours of a new field, demonstrating the complicated connections between health, aesthetic appreciation, medicine and garden history. Furthermore, I argue that many environmental-health ideas associated with miasmic theories became incorporated into the microbial ‘revolution’ taking place from the late nineteenth century. Finally, I note that a close study of settler environmental-health ideas reveals a far more ambiguous- a far more anxious – history of European engagement with temperate colonies than the existing historiography on the topic posits. Rather than wholly confident and arrogant agent of environmental exploitation, it reveals that great anxieties about health existed side-by-side with confidence in the environmentally transformative potential of colonisation.

text: Colonial geographies of settlement: Vegetation, towns, disease and well-being in Aotearoa/New Zealand, 1830s-1930s A Fruitful new area of environmental history research can be undertaken on the relationship between plants and health in colonial societies. By using New Zealand as a case study, I demonstrate the strength of settler beliefs in the connections between existing environments, environmental transformation, and their own health. I attempt to reconnect the historiographies of medical and environmental history by arguing that urban settlements- as much as rural areas – were important sites for debates about environmental change and human health. I adopt a broad perspective in order to sketch out the contours of a new field, demonstrating the complicated connections between health, aesthetic appreciation, medicine and garden history. Furthermore, I argue that many environmental-health ideas associated with miasmic theories became incorporated into the microbial ‘revolution’ taking place from the late nineteenth century. Finally, I note that a close study of settler environmental-health ideas reveals a far more ambiguous- a far more anxious – history of European engagement with temperate colonies than the existing historiography on the topic posits. Rather than wholly confident and arrogant agent of environmental exploitation, it reveals that great anxieties about health existed side-by-side with confidence in the environmentally transformative potential of colonisation.

year: 2008

title: Reducing our prison population: Past failures and new approaches

authors: Tauri, Juan Marcellus

abstract: Earlier this year the Minister of Justice, Andrew Little announced the latest in a long line of reviews, taxpayer-funded summits and inter-agency, ‘wholeof-government’ projects stretching back to the late-1980s, all aimed in some form or other, at making the criminal justice system more ‘safe’ and ‘effective’. Officially launched at a summit held in Porirua in August 2018, the aim of the latest review is to reduce New Zealand’s prison muster by 30% over the next 15 years. And unsurprisingly, given our significant over-representation in prisons, a specific focus of the review is on identifying ways to significantly reduce Māori over-representation in the prison population. This commentary represents a modest offering in response to the current government’s stated aim of making the justice system safer and more effective, and to reduce the prison muster, and it is based on two core arguments, namely that successive governments and the public service have failed to reduce offending and imprisonment and that successful solutions require community empowerment and government/public service accountability.

text: Reducing our prison population: Past failures and new approaches Earlier this year the Minister of Justice, Andrew Little announced the latest in a long line of reviews, taxpayer-funded summits and inter-agency, ‘wholeof-government’ projects stretching back to the late-1980s, all aimed in some form or other, at making the criminal justice system more ‘safe’ and ‘effective’. Officially launched at a summit held in Porirua in August 2018, the aim of the latest review is to reduce New Zealand’s prison muster by 30% over the next 15 years. And unsurprisingly, given our significant over-representation in prisons, a specific focus of the review is on identifying ways to significantly reduce Māori over-representation in the prison population. This commentary represents a modest offering in response to the current government’s stated aim of making the justice system safer and more effective, and to reduce the prison muster, and it is based on two core arguments, namely that successive governments and the public service have failed to reduce offending and imprisonment and that successful solutions require community empowerment and government/public service accountability.

year: 2019