title: The origins of a New Zealand suicidal cohort: 1970-2007

authors: Curtis, Cate

subjects: New Zealand

abstract: Many western countries have experienced increased rates of youth suicide over recent years. This has been an issue of particular concern in New Zealand, since it had the highest rate of youth suicide among OECD countries in the mid-1990s. However, while attention is drawn to the now declining youth suicide rate by politicians and policy-makers, what is obscured is a cohort effect.

In this paper we will argue that a cohort effect is clearly visible; suicide rates among 15-24 year olds came to the fore in the mid-1980s, peaking 10 years later, and were displaced by that among 25-35 year olds by the late-1990s.
Further, this century has been characterised by the rise of suicide rates among 35-44 year olds. This effect correlates with a dramatic downturn in the New Zealand economy in a five-year period bracketing 1970. We argue for an increased focus on social and economic factors underlying suicide.

text: The origins of a New Zealand suicidal cohort: 1970-2007 Many western countries have experienced increased rates of youth suicide over recent years. This has been an issue of particular concern in New Zealand, since it had the highest rate of youth suicide among OECD countries in the mid-1990s. However, while attention is drawn to the now declining youth suicide rate by politicians and policy-makers, what is obscured is a cohort effect.

In this paper we will argue that a cohort effect is clearly visible; suicide rates among 15-24 year olds came to the fore in the mid-1980s, peaking 10 years later, and were displaced by that among 25-35 year olds by the late-1990s.
Further, this century has been characterised by the rise of suicide rates among 35-44 year olds. This effect correlates with a dramatic downturn in the New Zealand economy in a five-year period bracketing 1970. We argue for an increased focus on social and economic factors underlying suicide.

year: 2011

title: Pattern and process of vegetation change (succession) in recent volcanic landscapes of New Zealand and Hawaii

authors: Clarkson, Bruce D.

subjects: volcanic landscapes

abstract: Volcanic activity (including lava flows, debris flows and tephra eruptions) is a regular feature of many landscapes of the North Island of New Zealand and the Hawaiian archipelago. Over the last 35 years, we have been using a combination of the chronosequence and direct monitoring methodologies (Clarkson 1998; Walker et al. 2010) to research the pattern and process of vegetation change (succession) in these landscapes. The following account summarizes pattern and process from our main study sites: Whakaari (White Island), Rangitoto Island, Mt Tarawera, Mt Ngauruhoe, Mt Ruapehu, and Mt Taranaki in New Zealand and Mauna Loa in Hawaii. The main focus of this account is forest development following significant eruptions.

text: Pattern and process of vegetation change (succession) in recent volcanic landscapes of New Zealand and Hawaii Volcanic activity (including lava flows, debris flows and tephra eruptions) is a regular feature of many landscapes of the North Island of New Zealand and the Hawaiian archipelago. Over the last 35 years, we have been using a combination of the chronosequence and direct monitoring methodologies (Clarkson 1998; Walker et al. 2010) to research the pattern and process of vegetation change (succession) in these landscapes. The following account summarizes pattern and process from our main study sites: Whakaari (White Island), Rangitoto Island, Mt Tarawera, Mt Ngauruhoe, Mt Ruapehu, and Mt Taranaki in New Zealand and Mauna Loa in Hawaii. The main focus of this account is forest development following significant eruptions.

year: 2010

title: Significance of an early date from an adzed tree stump in Northland

authors: Higham, Thomas F.G.

abstract: Ogle, Jones, Sutton and Wallace (1998) have recently investigated the radiocarbon dating of a tree stump ('Ogle's stump’) which had evidence of adze marks, near the site of Taumatawhana pa, Houhora, Northland. The conventional radiocarbon age of 938 ± 31 BP was obtained at the Institute of Geological and Nuclear Sciences Ltd (formerly INS) laboratory in 1971. Ogle et al.(1998) considered the 'inbuilt age' of the wood (see McFadgen, 1982) and assessed its contribution to the radiocarbon determination. In this brief paper we re-evaluate that methodology and question the conclusion of Ogle et al. (1998) that the date is reliable. We are particularly concerned with the comparison of the date with an associated radiocarbon result obtained by Elliot et al. (1995) from a nearby site at Lake Taumatawhana, which we think is misleading.

text: Significance of an early date from an adzed tree stump in Northland Ogle, Jones, Sutton and Wallace (1998) have recently investigated the radiocarbon dating of a tree stump ('Ogle's stump’) which had evidence of adze marks, near the site of Taumatawhana pa, Houhora, Northland. The conventional radiocarbon age of 938 ± 31 BP was obtained at the Institute of Geological and Nuclear Sciences Ltd (formerly INS) laboratory in 1971. Ogle et al.(1998) considered the 'inbuilt age' of the wood (see McFadgen, 1982) and assessed its contribution to the radiocarbon determination. In this brief paper we re-evaluate that methodology and question the conclusion of Ogle et al. (1998) that the date is reliable. We are particularly concerned with the comparison of the date with an associated radiocarbon result obtained by Elliot et al. (1995) from a nearby site at Lake Taumatawhana, which we think is misleading.

year: 1998