World checklist of hornworts and liverworts

A working checklist of accepted taxa worldwide is vital in achieving the goal of developing an online flora of all known plants by 2020 as part of the Global Strategy for Plant Conservation. We here present the first-ever worldwide checklist for liverworts (Marchantiophyta) and hornworts (Anthocerotophyta) that includes 7486 species in 398 genera representing 92 families from the two phyla. The checklist has far reaching implications and applications, including providing a valuable tool for taxonomists and systematists, analyzing phytogeographic and diversity patterns, aiding in the assessment of floristic and taxonomic knowledge, and identifying geographical gaps in our understanding of the global liverwort and hornwort flora. The checklist is derived from a working data set centralizing nomenclature, taxonomy and geography on a global scale. Prior to this effort a lack of centralization has been a major impediment for the study and analysis of species richness, conservation and systematic research at both regional and global scales. The success of this checklist, initiated in 2008, has been underpinned by its community approach involving taxonomic specialists working towards a consensus on taxonomy, nomenclature and distribution

Public Transit Corridor Assignment Assuming Congestion Due to Passenger Boarding and Alighting

Public transit, Assignment, Congestion,

Contested Cornerstones of Nonviolent National Self-Perception in Costa Rica: A Historical Approach

Huhn S. Contested Cornerstones of Nonviolent National Self-Perception in Costa Rica: A Historical Approach. GIGA Working Papers. Vol 101. Hamburg: GIGA; 2009.Crime, violence, and insecurity are perceived as society’s biggest problems in contemporary Costa Rica. This degree of priority is especially remarkable because the country has always been considered the peaceful exception in the violent Central American region. In this paper I analyze four cornerstones of the nonviolent national self-perception in the 1940s and 1980s as the fundamental basis for the current talk of crime: the civil war, the abolition of the military, the proclamation of neutrality, and the peace plan for Central America and the subsequent granting of the Nobel Peace Prize. The result of the analysis is the determination that these historical cornerstones were not publicly discussed as expressions of the nonviolent identity for which they are today cited as evidence

Open borders in the nineteenth century : constructing the national, the citizen and the foreigner in South America

This working paper describes and explains the historical origins of the division between the national and the foreigner in South America. In the early nineteenth century, all the previously Spanish possessions in South America as well as Brazil achieved independence. With this new freedom, countries turned their attention to asserting their statehood through the delineation of three constitutive elements: government, territory and population. The new governments had to define who were going to be considered as nationals, citizens and foreigners, and the rights that pertained to each of these categories. These countries were all concerned with attracting new settlers and very early on introduced constitutional provisions on open borders and equal treatment for foreigners. White, male Europeans were the principal addresses of open borders provisions in an effort to entice them to settle in territories presented as empty to the exclusion of indigenous groups, bring new industries, and contribute to the whitening of mixed race populations. Whilst weak statehood came with independence, forming nations was a much longer process and States used migration and citizenship policies as tools to define nationhood