title: Dating the emergence of the divaricate habit in the New Zealand flora

authors: Maurin, Kévin Jean Louis

subjects: Botany

abstract: The New Zealand divaricates are a collection of shrubs, short trees and tree juveniles whose crowns are made of tough interlaced twigs branching at wide angles and bearing small leaves. These species represent c. 13% of the native woody flora, a proportion not seen in any other region of the world. Since the late 19ᵗʰ century, ecologists and botanists have sought to understand the of drivers this unique case of convergent evolution. Debate has been dominated by two main competing hypotheses invoking (1) the effect of browsing by now-extinct avian herbivores (moa) and (2) a response to frosty and droughty Plio-Pleistocene climates. Observational and experimental evidence, as well as theoretical discussions, have not clearly favoured one over the other. More recently, a synthetic hypothesis involving both climate and browsing has been proposed, but has not been specifically tested yet: the divaricate habit did not become advantageous as an anti-browsing defence until Plio-Pleistocene climatic constraints prevented young trees and shrubs from growing quickly out of reach of ground-dwelling herbivores.
These hypotheses imply different expected divergence periods between divaricate species and their non-divaricate relatives. The focus of this PhD project is to produce a dated phylogeny including as many divaricates as possible, with the aim of bringing new evidence to help tease apart the various hypotheses about their evolution.
This PhD thesis is built from a previously published paper and draft manuscripts intended for submission to scientific journals. The first two papers report phylogenies of small genera (Pennantia J.R.Forst. & G.Forst. and Corokia A.Cunn.) that include divaricate species. These studies helped develop lab methods and offered the opportunity to test diverse phylogenetic methods on a smaller scale in preparation for the third paper, which is the core dating work of this PhD.
The phylogenies of Pennantia and Corokia provided in this thesis (Chapter 2 and 3, respectively) are the first published dated phylogenies of all the species of each genus. Building the phylogeny of Corokia was also the occasion to discuss two theories trying to explain the distribution of extant species on landmasses formerly part of Gondwana: vicariance and long-distance dispersal—Corokia appears to be one of an increasing number of cases where long-distance dispersal is indicated. The dated phylogeny of most New Zealand divaricate species presented in Chapter 4 reveals that, in the great majority of genera with divaricate representatives, the divaricate habit appeared in New Zealand within the last 5 My, i.e. since the beginning of the Pliocene. 
On one hand, this research constitutes a valuable methodological addition to the field of molecular phylogenetics by (1) disseminating a method for retrieving extra genetic markers, at no marginal cost, from Next Generation Sequencing shotgun sequencing data of DNA samples enriched for a specific set of markers, and (2) developing a guide to using a piece of phylogenetic reconstruction software (treePL), which was missing from the literature and needed by users. On the other hand, dating the emergence of the divaricate habit brought new and crucial evidence to the debate over what promoted the evolution of the divaricate habit in New Zealand: the findings are clearly consistent with a major effect of Plio-Pleistocene climates—and given evidence and discussion from past studies of these plants and similar plants around the world, the effect of browsing by moa was also probably involved.

text: Dating the emergence of the divaricate habit in the New Zealand flora The New Zealand divaricates are a collection of shrubs, short trees and tree juveniles whose crowns are made of tough interlaced twigs branching at wide angles and bearing small leaves. These species represent c. 13% of the native woody flora, a proportion not seen in any other region of the world. Since the late 19ᵗʰ century, ecologists and botanists have sought to understand the of drivers this unique case of convergent evolution. Debate has been dominated by two main competing hypotheses invoking (1) the effect of browsing by now-extinct avian herbivores (moa) and (2) a response to frosty and droughty Plio-Pleistocene climates. Observational and experimental evidence, as well as theoretical discussions, have not clearly favoured one over the other. More recently, a synthetic hypothesis involving both climate and browsing has been proposed, but has not been specifically tested yet: the divaricate habit did not become advantageous as an anti-browsing defence until Plio-Pleistocene climatic constraints prevented young trees and shrubs from growing quickly out of reach of ground-dwelling herbivores.
These hypotheses imply different expected divergence periods between divaricate species and their non-divaricate relatives. The focus of this PhD project is to produce a dated phylogeny including as many divaricates as possible, with the aim of bringing new evidence to help tease apart the various hypotheses about their evolution.
This PhD thesis is built from a previously published paper and draft manuscripts intended for submission to scientific journals. The first two papers report phylogenies of small genera (Pennantia J.R.Forst. & G.Forst. and Corokia A.Cunn.) that include divaricate species. These studies helped develop lab methods and offered the opportunity to test diverse phylogenetic methods on a smaller scale in preparation for the third paper, which is the core dating work of this PhD.
The phylogenies of Pennantia and Corokia provided in this thesis (Chapter 2 and 3, respectively) are the first published dated phylogenies of all the species of each genus. Building the phylogeny of Corokia was also the occasion to discuss two theories trying to explain the distribution of extant species on landmasses formerly part of Gondwana: vicariance and long-distance dispersal—Corokia appears to be one of an increasing number of cases where long-distance dispersal is indicated. The dated phylogeny of most New Zealand divaricate species presented in Chapter 4 reveals that, in the great majority of genera with divaricate representatives, the divaricate habit appeared in New Zealand within the last 5 My, i.e. since the beginning of the Pliocene. 
On one hand, this research constitutes a valuable methodological addition to the field of molecular phylogenetics by (1) disseminating a method for retrieving extra genetic markers, at no marginal cost, from Next Generation Sequencing shotgun sequencing data of DNA samples enriched for a specific set of markers, and (2) developing a guide to using a piece of phylogenetic reconstruction software (treePL), which was missing from the literature and needed by users. On the other hand, dating the emergence of the divaricate habit brought new and crucial evidence to the debate over what promoted the evolution of the divaricate habit in New Zealand: the findings are clearly consistent with a major effect of Plio-Pleistocene climates—and given evidence and discussion from past studies of these plants and similar plants around the world, the effect of browsing by moa was also probably involved.

year: 2021

title: Wrist injury prevention in gymnastics: Gymnast and coach perspectives

authors: Dalal, Sneha

subjects: gymnastics injuries

abstract: This study assesses the understanding and awareness of injury prevention programmes in minimising wrist injuries in gymnastics. The study uses a mixed-method approach, collecting extensive data via an anonymous online survey for gymnasts and their parents or guardians, and interviews with coaches. The research aims to understand program awareness, implementation, barriers, and outcomes from various perspectives. The findings from the study contribute to the existing body of knowledge on wrist injury prevention in gymnastics and provide valuable insights for improving training practices and program design to create safer gymnast-centric training programs. The study shows that flexibility and strength training alone do not significantly reduce wrist injuries in gymnastics, suggesting the need for a more comprehensive injury prevention approach. Findings also highlight the importance of balancing training frequency with adequate rest days to minimise injury risk. The lack of awareness and inconsistent implementation of injury prevention programs indicates a need for better communication and education among gymnasts, coaches and their parents/guardians. Interviews with coaches emphasise gradual training progression, strength building, and holistic well-being, underscoring the importance of a multifaceted approach to injury prevention. The study concludes that injury prevention programs must be prioritised and implemented effectively to further reduce the risk of wrist injuries, highlighting the importance of a multifaceted individualised approach to wrist injury prevention in gymnastics.

text: Wrist injury prevention in gymnastics: Gymnast and coach perspectives This study assesses the understanding and awareness of injury prevention programmes in minimising wrist injuries in gymnastics. The study uses a mixed-method approach, collecting extensive data via an anonymous online survey for gymnasts and their parents or guardians, and interviews with coaches. The research aims to understand program awareness, implementation, barriers, and outcomes from various perspectives. The findings from the study contribute to the existing body of knowledge on wrist injury prevention in gymnastics and provide valuable insights for improving training practices and program design to create safer gymnast-centric training programs. The study shows that flexibility and strength training alone do not significantly reduce wrist injuries in gymnastics, suggesting the need for a more comprehensive injury prevention approach. Findings also highlight the importance of balancing training frequency with adequate rest days to minimise injury risk. The lack of awareness and inconsistent implementation of injury prevention programs indicates a need for better communication and education among gymnasts, coaches and their parents/guardians. Interviews with coaches emphasise gradual training progression, strength building, and holistic well-being, underscoring the importance of a multifaceted approach to injury prevention. The study concludes that injury prevention programs must be prioritised and implemented effectively to further reduce the risk of wrist injuries, highlighting the importance of a multifaceted individualised approach to wrist injury prevention in gymnastics.

year: 2025

title: Maori and Pakeha at Te Aroha: the context: 2: Maori in Hauraki in the nineteenth century

authors: Hart, Philip

abstract: After the arrival of Europeans, the Maori population of Hauraki suffered a rapid decline. Some rangatira opposed Pakeha ways, whereas others adopted these for their personal benefit. Keeping ‘the peace of Hauraki’ required government agents to intervene in various disputes between hapu (Ngati Hako in particular causing concern in the 1870s and early 1880s). Although rangatira had links to both Queen Victoria and King Tawhiao, the government was relieved that most remained ‘loyal’ to the new order, and only an intransigent minority opposed the spread of ‘civilisation’ through its roads, telegraph, and the snagging of the Waihou River. A liking for Pakeha goods encouraged collaboration, with Maori joining the cash economy through their involvement in road making, gum digging, and European agriculture to raise money for, in part, traditional gatherings that for a while were more lavish than earlier possible.
Maori of all ranks were quick to stand up for their rights by using the court system, reminding Pakeha of the Treaty of Waitangi, and, in some cases, violence. Tensions were eased by Maori socializing with Pakeha in sport, horse racing, and even the Volunteers, but drinking together in hotels could result in fights, and the lure of alcohol had to be countered by temperance movements. A few Maori children attended school, with Pakeha, and for a time the government provided a (free) doctor and vaccinated them against smallpox (though some preferred traditional ‘cures’ for other ailments). For most, living conditions remained poor. Criminal behaviour was of a minor nature. Christianity had to compete with old beliefs (notably in maketu), newer ones such as ‘Hauhauism’, and by the later years of the century the popularity of the Mormons.
Examples are included of intermarriage, ‘half-castes’, and Pakeha Maori, all being notable features of the time. In a variety of ways, Maori society was sufficiently resilient to adapt and thereby to survive the impact of Pakeha settlement, which produced massive changes and dominated the region well before the end of the century.

text: Maori and Pakeha at Te Aroha: the context: 2: Maori in Hauraki in the nineteenth century After the arrival of Europeans, the Maori population of Hauraki suffered a rapid decline. Some rangatira opposed Pakeha ways, whereas others adopted these for their personal benefit. Keeping ‘the peace of Hauraki’ required government agents to intervene in various disputes between hapu (Ngati Hako in particular causing concern in the 1870s and early 1880s). Although rangatira had links to both Queen Victoria and King Tawhiao, the government was relieved that most remained ‘loyal’ to the new order, and only an intransigent minority opposed the spread of ‘civilisation’ through its roads, telegraph, and the snagging of the Waihou River. A liking for Pakeha goods encouraged collaboration, with Maori joining the cash economy through their involvement in road making, gum digging, and European agriculture to raise money for, in part, traditional gatherings that for a while were more lavish than earlier possible.
Maori of all ranks were quick to stand up for their rights by using the court system, reminding Pakeha of the Treaty of Waitangi, and, in some cases, violence. Tensions were eased by Maori socializing with Pakeha in sport, horse racing, and even the Volunteers, but drinking together in hotels could result in fights, and the lure of alcohol had to be countered by temperance movements. A few Maori children attended school, with Pakeha, and for a time the government provided a (free) doctor and vaccinated them against smallpox (though some preferred traditional ‘cures’ for other ailments). For most, living conditions remained poor. Criminal behaviour was of a minor nature. Christianity had to compete with old beliefs (notably in maketu), newer ones such as ‘Hauhauism’, and by the later years of the century the popularity of the Mormons.
Examples are included of intermarriage, ‘half-castes’, and Pakeha Maori, all being notable features of the time. In a variety of ways, Maori society was sufficiently resilient to adapt and thereby to survive the impact of Pakeha settlement, which produced massive changes and dominated the region well before the end of the century.

year: 2016