title: Whole genome resequencing reveals origins and global invasion pathways of the Japanese beetle Popillia japonica

authors: Funari, Rebecca

subjects: phylogeography

abstract: Invasive species are an increasing global threat given their ability to rapidly spread and adapt to novel environments. The adverse ecological and economic impacts of invasive species highlight the critical need to understand the mechanisms that underpin invasion processes and success. The Japanese beetle, Popillia japonica, is an invasive pest of remarkable interest, as it feeds on hundreds of economically valuable plant species. It has been expanding outside of its native range in Japan since the first decades of the 20th century, colonising large areas of North America and, more recently, Europe. Here, we compared whole-genome resequencing data from individuals encompassing the entire species distribution to study the geographic differentiation of P. japonica populations and reconstruct expansion routes from Japan to the USA and Europe. We found six genomically distinguishable clusters, corresponding to the approximate colonisation areas at a continental scale. Our analysis supported an ancestral divergence between South and North/Central Japan, with the latter being the source of the initial invasion to the USA. Coalescent simulations supported independent bridgehead events from the USA to the Azores and Italy. We also investigated possible signals of selection to better understand the adaptive mechanisms that underlie the invasion success of P. japonica. However, the absence of strong selection signatures suggested that the beetle's adaptive ability might be embedded in pre-existing genomic features. Our comprehensive genome-wide dataset allowed a detailed inference of the invasion process and may be useful in determining the origin of P. japonica individuals in future invasion events.

text: Whole genome resequencing reveals origins and global invasion pathways of the Japanese beetle Popillia japonica Invasive species are an increasing global threat given their ability to rapidly spread and adapt to novel environments. The adverse ecological and economic impacts of invasive species highlight the critical need to understand the mechanisms that underpin invasion processes and success. The Japanese beetle, Popillia japonica, is an invasive pest of remarkable interest, as it feeds on hundreds of economically valuable plant species. It has been expanding outside of its native range in Japan since the first decades of the 20th century, colonising large areas of North America and, more recently, Europe. Here, we compared whole-genome resequencing data from individuals encompassing the entire species distribution to study the geographic differentiation of P. japonica populations and reconstruct expansion routes from Japan to the USA and Europe. We found six genomically distinguishable clusters, corresponding to the approximate colonisation areas at a continental scale. Our analysis supported an ancestral divergence between South and North/Central Japan, with the latter being the source of the initial invasion to the USA. Coalescent simulations supported independent bridgehead events from the USA to the Azores and Italy. We also investigated possible signals of selection to better understand the adaptive mechanisms that underlie the invasion success of P. japonica. However, the absence of strong selection signatures suggested that the beetle's adaptive ability might be embedded in pre-existing genomic features. Our comprehensive genome-wide dataset allowed a detailed inference of the invasion process and may be useful in determining the origin of P. japonica individuals in future invasion events.

year: 2025

title: Book review: Chang‐tai Hung. Mao's New World: Political Culture in the Early People's Republic

authors: Galikowski, Maria

subjects: book review

abstract: This article reviews the book, “Chang‐tai Hung. Mao's New World: Political Culture in the Early People's Republic”, by Chang-tai Hung.

text: Book review: Chang‐tai Hung. Mao's New World: Political Culture in the Early People's Republic This article reviews the book, “Chang‐tai Hung. Mao's New World: Political Culture in the Early People's Republic”, by Chang-tai Hung.

year: 2011

title: Taku Ara, Taku Mahara: Pākehā Family Experiences of Kaupapa Māori and Bilingual Education

authors: Barnes, Alexander Louis

subjects: Kaupapa Maori

abstract: Kaupapa Māori (indigenous Māori-centred philosophies) initiatives have transformed various social, cultural and public projects in the domains of governance and constitutional issues, health, education, the environment, community development and research in Aotearoa – New Zealand. As a Pākehā graduate of te kōhanga reo and kura kaupapa Māori (Māori language immersion pre-school and primary school), this research is concerned with exploring the impact of kaupapa Māori and bilingual educational initiatives on my life and the lives of two other Pākehā families who share similar educational backgrounds. This foundational study utilises qualitative narrative inquiry methods as a means of understanding and analysing the implications for Pākehā as a result of their participation in kaupapa Māori and bilingual education. An intergenerational family approach is used in this research whereby the individual voices and experiences of young adults are heard equally alongside their parents’. Collectively understood, the themes represented in this research offer a unique means of understanding why Päkehä families decided to be involved in Māori immersion settings, and what these experiences mean to them now. One of the principle aims of this study is that it be used as a platform for dialogue amongst Pākehā, non-Māori and Māori about the future direction of bicultural education in Aotearoa – New Zealand.

text: Taku Ara, Taku Mahara: Pākehā Family Experiences of Kaupapa Māori and Bilingual Education Kaupapa Māori (indigenous Māori-centred philosophies) initiatives have transformed various social, cultural and public projects in the domains of governance and constitutional issues, health, education, the environment, community development and research in Aotearoa – New Zealand. As a Pākehā graduate of te kōhanga reo and kura kaupapa Māori (Māori language immersion pre-school and primary school), this research is concerned with exploring the impact of kaupapa Māori and bilingual educational initiatives on my life and the lives of two other Pākehā families who share similar educational backgrounds. This foundational study utilises qualitative narrative inquiry methods as a means of understanding and analysing the implications for Pākehā as a result of their participation in kaupapa Māori and bilingual education. An intergenerational family approach is used in this research whereby the individual voices and experiences of young adults are heard equally alongside their parents’. Collectively understood, the themes represented in this research offer a unique means of understanding why Päkehä families decided to be involved in Māori immersion settings, and what these experiences mean to them now. One of the principle aims of this study is that it be used as a platform for dialogue amongst Pākehā, non-Māori and Māori about the future direction of bicultural education in Aotearoa – New Zealand.

year: 2006