<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Seabloom, E. W.</style></author><author><style face="normal" font="default" size="100%">Williams, J. W.</style></author><author><style face="normal" font="default" size="100%">Slayback, D.</style></author><author><style face="normal" font="default" size="100%">Stoms, D. M.</style></author><author><style face="normal" font="default" size="100%">Viers, J. H.</style></author><author><style face="normal" font="default" size="100%">Dobson, A. P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Human impacts, plant invasion, and imperiled plant species in California</style></title><secondary-title><style face="normal" font="default" size="100%">Ecological Applications</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">California</style></keyword><keyword><style  face="normal" font="default" size="100%">dispersal</style></keyword><keyword><style  face="normal" font="default" size="100%">exotic plants</style></keyword><keyword><style  face="normal" font="default" size="100%">extinction</style></keyword><keyword><style  face="normal" font="default" size="100%">global biodiversity hotspot</style></keyword><keyword><style  face="normal" font="default" size="100%">habitat loss</style></keyword><keyword><style  face="normal" font="default" size="100%">invasive species</style></keyword><keyword><style  face="normal" font="default" size="100%">rare species</style></keyword><keyword><style  face="normal" font="default" size="100%">species richness</style></keyword><keyword><style  face="normal" font="default" size="100%">structural equation models</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2006</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.esajournals.org/esaonline/?request=get-abstract&amp;issn=1051-0761&amp;volume=016&amp;issue=04&amp;page=1338</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">1338-1350</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Invasive species are one of the fastest growing conservation problems. These species homogenize the world’s flora and fauna, threaten rare and endemic species, and impose large economic costs. Here, we examine the distribution of 834 of the more than 1000 exotic plant taxa that have become established in California, USA. Total species richness increases with productivity; however, the exotic flora is richest in low-lying coastal sites that harbor large numbers of imperiled species, while native diversity is highest in areas with high mean elevation. Weedy and invasive exotics are more tightly linked to the distribution of imperiled species than the overall pool of exotic species. Structural equation modeling suggests that while human activities, such as urbanization and agriculture, facilitate the initial invasion by exotic plants, exotics spread ahead of the front of human development into areas with high numbers of threatened native plants. The range sizes of exotic taxa are an order of magnitude smaller than for comparable native taxa. The current small range size of exotic species implies that California has a significant ‘‘invasion debt’’ that will be paid as exotic plants expand their range and spread throughout the state.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Seabloom, E. W.</style></author><author><style face="normal" font="default" size="100%">Dobson, A. P.</style></author><author><style face="normal" font="default" size="100%">Stoms, D. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Extinction rates under nonrandom patterns of habitat loss</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the National Academy of Science of the United States of America</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2002</style></year></dates><number><style face="normal" font="default" size="100%">17</style></number><volume><style face="normal" font="default" size="100%">99</style></volume><pages><style face="normal" font="default" size="100%">11229-11234</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Most models that examine the effects of habitat conversion on species extinctions assume that habitat conversion occurs at random. This assumption allows predictions about extinction rates based on the speciesarea relationship. We show that the spatially aggregated nature of habitat conversion introduces a significant bias that may lead species-loss rates to exceed those predicted by speciesarea curves. Correlations between human activity and major compositional gradients, or species richness, also alter predicted species extinction rates. We illustrate the consequences of nonrandom patterns of habitat conversion by using a data set that combines the distribution of native vascular plants with human activity patterns in California.</style></abstract></record></records></xml>