Genomic analysis of a reef-building coral, Acropora digitifera, reveals complex population structure and a migration network in the Nansei Islands, Japan

Understanding the structure and connectivity of coral populations is fundamental for developing marine conservation policies, especially in patchy environments such as archipelagos. The Nansei Islands, extending more than 1,000 km in southwestern Japan, are characterized by high levels of biodiversity and endemism, supported by coral reefs, although precise, detailed genetic attributes of corals are still largely unknown. In this study, we conducted population genomic analyses based on genome-wide, single-nucleotide polymorphisms (SNPs) of Acropora digitifera, a common species in the Nansei Islands, for which a complete genome is available. With ~24x sequencing coverage of entire genomes of 303 colonies collected at 21 locations, we identified more than four million genome-wide SNPs. While population structure analyses suggested weak genetic differentiation among sampled locations, the most southwestern location (the west end of the Yaeyama Islands) was genetically similar to the northernmost location (the Tanegashima Islands), separated by >1,000 km. Although examination of a migration network found a general tendency of northward migration along the Kuroshio Current, a substantial amount of southward migration was also detected, indicating important contributions of minor ocean currents to coral larval dispersal. Moreover, heterogeneity in the transition of effective population sizes among locations suggests different histories for individual subpopulations. The unexpected complexity of both past and present population dynamics in the Nansei Islands implies that heterogeneity of ocean currents and local environments, past and present, have influenced the population structure of this species, highlighting the importance of local scale assessments for effective coral restoration and management.

Detention and alternatives to detention in international protection and return procedures in Ireland

Related Press Release Detention and alternatives to detention can be used for immigration-related purposes in Ireland. Detention takes place in Garda Síochána stations and prisons. Throughout 2019, 477 people were detained in Irish prisons for immigration-related reasons, reducing to 245 people in 2020 during the COVID-19 pandemic. Alternatives to detention, such as regularly reporting to a Garda station, however, tend to be used more routinely and in the first instance. This study presents a comprehensive review of legislation and practice on detention and alternatives to detention in international protection and return procedures in Ireland. It is based on the Irish contribution to a European Migration Network (EMN) report comparing the situation in EU Member States. Immigration detention in the EU and the UK has been the subject of considerable academic research; however, there has been comparatively less research on the situation in Ireland, particularly regarding alternatives to detention.

Graphite Classification Based on Improved Convolution Neural Network

In the development of high-tech industries, graphite has become increasingly more important. The world has gradually entered the graphite era from the silicon era. In order to make good use of high-quality graphite resources, a graphite classification and recognition algorithm based on an improved convolution neural network is proposed in this paper. Based on the self-built initial data set, the offline expansion and online enhancement of the data set can effectively expand the data set and reduce the risk of deep convolution neural network overfitting. Based on the visual geometry group 16 (VGG16), residual net 34 (ResNet34), and mobile net Vision 2 (MobileNet V2), a new output module is redesigned and loaded into the full connection layer. The improved migration network enhances the generalization ability and robustness of the model; moreover, combined with the focal loss function, the superparameters of the model are modified and trained on the basis of the graphite data set. The simulation results illustrate that the recognition accuracy of the proposed method is significantly improved, the convergence speed is accelerated, and the model is more stable, which proves the feasibility and effectiveness of the proposed method.

Irish Jacobites in Continental Europe at End of 17th — 18th Centuries

The problem of migration of the Irish military to the European continent in modern times is examined in the article. Particular attention is paid to their role, political attitudes and adaptation in host societies. The relevance of the study is due to insufficient knowledge of the specifics of the Irish military migration of the 18th century and the degree to which Jacobite ideology influenced the political mood of Irish people in Europe. The novelty of the study is seen in the fact that the study of the mass migration of the Irish military to Europe in the period between the Treaty of Limerick in 1691 and the end of the War of Austrian Succession in 1748 will complement the Irish military history of modern times. The study of personal correspondence, memoirs and literary works allows a deeper study of the issues of identity, ideology and collective memory of the Irish military, to determine the degree of participation of the Irish in various dynastic wars and conspiracies in Europe in the XVIII century, to restore some details from the life of the Irish Jacobites, conspirators, spies and social net-works migrants. Analysis of various sources has led to a rethinking of the situation of the Irish diaspora in France and Spain. It was found that through an extensive migration network, the Irish Jacobites communicated with the world community of Irish-in-exile, posing a threat to the Hanoverian government.

Migration terminology in the EU Institutions

‘Migration’ has recently become a single domain for specialized terminology in the European Union, linked to the crisis which has been rapidly unfolding in Europe since 2015. The migration crisis, with the dramatic increase in arrivals of migrants in Europe, has highlighted the uncertainty of institutional classifications used to describe and manage migration flows. What is a migrant in the EU Institutions and how is the term refugee or asylum seeker respectively classified? The present study delves into Migration from a terminological perspective and investigates how migrants have been mirrored through terminology in institutional texts from 1950 to 2016 by analyzing two sets of corpora: the European Migration Network glossaries (EMN) of the European Commission and the EU database of official legislative text, EUR-lex EN 2/16. This paper aims to show how migration phenomena can be narrated through the lens of terminology and how term choice plays a vital role in making an impact in the representation of migrants and refugees in political institutions and society.

Structure and Dynamic of Global Population Migration Network

People are the most important factors of economy and the primary carriers of social culture. Cross-border migration brings economic and cultural impacts to the origin and destination and is also a key to reflect the international relations of related countries. In fact, the migration relationships of countries are complex and multilateral, but most traditional migration models are bilateral. Network theories could provide a better description of global migration to show the structure and statistical characteristics more clearly. Based on the estimated migration data and disparity filter algorithm, the networks describing the global multilateral migration relationships have been extracted among 200 countries over fifty years. The results show that the global migration networks during 1960–2015 exhibit a clustering and disassortative feature, implying globalized and multipolarized changes of migration during these years. The networks were embed into a Poincaré disk, yielding a typical and hierarchical “core-periphery” structure, which is associated with angular density distribution, and has been used to describe the “multicentering” trend since 1990s. Analysis on correlation and evolution of communities indicates the stability of most communities, yet some structural changes still exist since 1990s, which reflect that the important historical events are contributable to regional and even global migration patterns.