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.     

The Lives and Afterlives of Vis and Rāmin

This article is a review of the afterlife, or Nachleben, of the romance Vis and Rāmin, one of the first representatives of its genre in New Persian literature. In addition to providing readers with an extensive bibliography of sources and research concerning the poem, it also analyzes these materials to put forward two basic arguments: one, that moral or religious antipathy to the poem’s contents may not have played as great a role in its fortunes as did aesthetic taste; and two, that V&R proved to be a more widely circulated and durable work than is commonly supposed, but on the level of fragments, not the entire text. In light of these arguments, it is proposed that studies structured around the comparison of fragments—themes, ideas, ethics, and motifs, rather than whole texts—may offer more purchase in constructing models of analysis that situate V&R, and Persian literature more broadly, within a literary oikumene in which it connects and interacts with neighboring traditions.     

世界纪录世界有多大？数字告诉你……

以色列12 以色列航空工业公司微型机器人实验室研制出一款新型机器人——“机械蝴蝶”。它属于接近纳米技术的微电子科技产品。“机械蝴蝶”长20厘米,仅重12克,内含发动机、传感器、通讯及转向系统,模拟蝴蝶煽动四片翅膀推动其前进。