title: Population genomic insights into invasion success in a polyphagous agricultural pest, Halyomorpha halys

authors: Parvizi, Elahe

subjects: gene flow

abstract: Invasive species are increasingly threatening ecosystems and agriculture by rapidly expanding their range and adapting to environmental and human-imposed selective pressures. The genomic mechanisms that underlie such rapid changes remain unclear, especially for agriculturally important pests. Here, we used genome-wide polymorphisms derived from native, invasive, and intercepted samples and populations of the brown marmorated stink bug (BMSB), Halyomorpha halys, to gain insights into population genomics processes that have promoted the successful global invasion of this polyphagous pest. Our analysis demonstrated that BMSB exhibits spatial structure but admixture rates are high among introduced populations, resulting in similar levels of genomic diversity across native and introduced populations. These spatial genomic patterns suggest a complex invasion scenario, potentially with multiple bridgehead events, posing a challenge for accurately assigning BMSB incursions to their source using reduced-representation genomic data. By associating allele frequencies with the invasion status of BMSB populations, we found significantly differentiated single nucleotide polymorphisms (SNPs) located in close proximity to genes for insecticide resistance and olfaction. Comparing variations in allele frequencies among populations for outlier SNPs suggests that BMSB invasion success has probably evolved from standing genetic variation. In addition to being a major nuisance of households, BMSB has caused significant economic losses to agriculture in recent years and continues to expand its range. Despite no record of BMSB insecticide resistance to date, our results show high capacity for potential evolution of such traits, highlighting the need for future sustainable and targeted management strategies.

text: Population genomic insights into invasion success in a polyphagous agricultural pest, Halyomorpha halys Invasive species are increasingly threatening ecosystems and agriculture by rapidly expanding their range and adapting to environmental and human-imposed selective pressures. The genomic mechanisms that underlie such rapid changes remain unclear, especially for agriculturally important pests. Here, we used genome-wide polymorphisms derived from native, invasive, and intercepted samples and populations of the brown marmorated stink bug (BMSB), Halyomorpha halys, to gain insights into population genomics processes that have promoted the successful global invasion of this polyphagous pest. Our analysis demonstrated that BMSB exhibits spatial structure but admixture rates are high among introduced populations, resulting in similar levels of genomic diversity across native and introduced populations. These spatial genomic patterns suggest a complex invasion scenario, potentially with multiple bridgehead events, posing a challenge for accurately assigning BMSB incursions to their source using reduced-representation genomic data. By associating allele frequencies with the invasion status of BMSB populations, we found significantly differentiated single nucleotide polymorphisms (SNPs) located in close proximity to genes for insecticide resistance and olfaction. Comparing variations in allele frequencies among populations for outlier SNPs suggests that BMSB invasion success has probably evolved from standing genetic variation. In addition to being a major nuisance of households, BMSB has caused significant economic losses to agriculture in recent years and continues to expand its range. Despite no record of BMSB insecticide resistance to date, our results show high capacity for potential evolution of such traits, highlighting the need for future sustainable and targeted management strategies.

year: 2022-10-17

title: Birth, Death, and Marriage in the Garden: Canterbury Colonial Women Gardeners, 1850–1914

authors: Bainbridge, Annette Helen

subjects: Garden History

abstract: This thesis presents a study of the role of gardens in the life stages of colonial women of Canterbury. Using the framework of the expected life-cycle of middle- and upper-class Victorian women (birth, marriage, death), this thesis analyses how women’s garden-making, and interactions with gardens, cast new light on various aspects of colonial gender discourse and gender relations.

The study demonstrates that gardens of colonial women were sites of social cohesion in settler communities. Colonial women used the garden for family or communal events, such as wedding celebrations, and community games and sports that helped bind together rural society. Women were also capable of using the garden as a site of resistance to, or rejection of, the prevailing gender norms. The ambiguity of the garden space, both public and private, connected to the house but separate from the house, enabled women to use it as a site for pushing the boundaries of what was considered socially acceptable behaviour in colonial society

Women gardeners also made considerable contributions to environmental transformation in New Zealand’s South Island. This thesis argues that this has been overlooked or minimalised in environmental historiography in New Zealand. It also argues that previous historical arguments that women gardeners were motivated primarily by imperial ideologies and the desire for social display, ignores the very real role played by environmental hazards and health issues in the creation of colonial gardens.

text: Birth, Death, and Marriage in the Garden: Canterbury Colonial Women Gardeners, 1850–1914 This thesis presents a study of the role of gardens in the life stages of colonial women of Canterbury. Using the framework of the expected life-cycle of middle- and upper-class Victorian women (birth, marriage, death), this thesis analyses how women’s garden-making, and interactions with gardens, cast new light on various aspects of colonial gender discourse and gender relations.

The study demonstrates that gardens of colonial women were sites of social cohesion in settler communities. Colonial women used the garden for family or communal events, such as wedding celebrations, and community games and sports that helped bind together rural society. Women were also capable of using the garden as a site of resistance to, or rejection of, the prevailing gender norms. The ambiguity of the garden space, both public and private, connected to the house but separate from the house, enabled women to use it as a site for pushing the boundaries of what was considered socially acceptable behaviour in colonial society

Women gardeners also made considerable contributions to environmental transformation in New Zealand’s South Island. This thesis argues that this has been overlooked or minimalised in environmental historiography in New Zealand. It also argues that previous historical arguments that women gardeners were motivated primarily by imperial ideologies and the desire for social display, ignores the very real role played by environmental hazards and health issues in the creation of colonial gardens.

year: 2015

title: Te matakite - Te kupu whakaari

authors: Temara, Pou

subjects: Matakite

abstract: Ko te whāinga o tēnei tuhinga poto he matapaki i te matakite me te kupu whakaari, arā, he whakatakoto i tētahi tūāpapa kōrero e mārama ai te kaipānui ki te tikanga o ēnei kaupapa e rua e ai ki tā te Māori i matapaki ai. Otirā, he kōrero tā ngā iwi katoa o te ao mō te matakite me te kupu whakaari, kai tēnā iwi tāna kōrero, kai tēnā iwi tāna. Kāore tēnei tuhinga e rere ki te whakamārama i ā ētahi kōrero, engari mau tonu ki te ao Māori. Mēnā ka whakahua i ngā whakamārama a ētahi atu iwi, e whai ana kia mārama ai te tauira ki tā te Māori i kōrero ai.

text: Te matakite - Te kupu whakaari Ko te whāinga o tēnei tuhinga poto he matapaki i te matakite me te kupu whakaari, arā, he whakatakoto i tētahi tūāpapa kōrero e mārama ai te kaipānui ki te tikanga o ēnei kaupapa e rua e ai ki tā te Māori i matapaki ai. Otirā, he kōrero tā ngā iwi katoa o te ao mō te matakite me te kupu whakaari, kai tēnā iwi tāna kōrero, kai tēnā iwi tāna. Kāore tēnei tuhinga e rere ki te whakamārama i ā ētahi kōrero, engari mau tonu ki te ao Māori. Mēnā ka whakahua i ngā whakamārama a ētahi atu iwi, e whai ana kia mārama ai te tauira ki tā te Māori i kōrero ai.

year: 2016