A lesson from Bass Strait on connectivity conservation

Isolation effects on the distributions of plant species in fragmented forests appear to be weak over tens to hundreds of years and strong over geological eras. The 250 km wide, 6.5 millennia old Bass Strait, and other millennium-scale disjunctions in the range of Eucalyptus regnans forests, were used to determine the effects of intermediate periods of isolation on plant species occurrence and composition. Three of six floristic communities were found on both sides of Bass Strait. The residuals from multiple regression models using climatic variables on the latitude vector were not explained by latitude, indicating negligible isolation effects from Bass Strait. However, there was a lesser compositional effect of disjunctions within land masses than between land masses, suggesting some effect of the larger barrier. No species that commonly occurred with E. regnans and were largely confined to wet forest exhibited absences from any region where the climate and soils were within their range. If areas isolated from each other for millennia can maintain their vascular plant biota, the expenditure of conservation funds on creating corridors to connect large areas separated by anthropogenic landscape modification might require more justification than it is currently afforded.     

Constructing clandestine communities: oaths of collective secrecy and conceptual boundaries in the late antique Mediterranean

This article explores fourth- to seventh-century narratives about oaths of collective secrecy, which our sources typically frame negatively. By examining the terminology used in reference to these promises, the dynamics inherent in the practice and its relationship to oath-taking customs in other contexts, and the influence of Christianity on the discourses around such pledges, we can see that late antique authors routinely frame the swearing of these pacts as a transition to a liminal state of existence. Through this rhetoric, church and state authorities constructed conceptual boundaries between those who agreed and disagreed with their definitions of acceptable behaviours.