http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/ucd_environment_elcp/rss Recent eScholarship items from Ecotoxicology Lead Campus Program Publications Sat, 27 Jun 2026 05:30:15 +0000 https://escholarship.org/uc/item/5bb7k6t9 <p>Studies from different continents have proved amphibians to be the most frequently killed vertebrates on roads. In Central-Europe their ratio is between 70 and 88 percent. Local populations are known to become extinct or genetically isolated, and avoidance is also recognised, especially where the road network is dense and the traffi c is intensive. Besides ecological and conservation considerations, amphibian road kills also present a hazard for motorists when amphibians migrate in large numbers. Mitigation measures for amphibians have been applied since the 1960s. In Central-Europe the fi rst amphibianrelated culvert modifi cation occurred at Parassapuszta, Hungary, in 1986. A number of amphibian-oriented mitigation measures have been made in the region under roads and motorways since then, especially after 1995. The aim of this paper is to describe the main features of these constructions, overview the different designs, and make suggestions for their improvement as well... https://escholarship.org/uc/item/5bb7k6t9 Wed, 8 Nov 2006 00:00:00 +0000 Puky, Miklós https://escholarship.org/uc/item/38w6t5ds <p>Habitat and population fragmentation as a result of human disturbance in the form of human transportation and settlement corridors is affecting the viability of wildlife populations worldwide. I studied dispersal, inter-population movement and population fragmentation of grizzly bears near the southern extent of their North American range in southwestern Canada and northwestern U.S.A. This area represents the interior portion of the southern edge of grizzly bear distribution following 100 years of range contraction. I address whether anthropogenic fragmentation has affected grizzly bear populations in this vulnerable area. Human attitudes toward grizzly bears, and large carnivores in general, have experienced a paradigm shift from active persecution towards tolerance and respect. However, major forces underpinning range contraction, including human-caused mortality and fragmentation, may be still operating, albeit, more subtly and less intentionally. Checking further range... https://escholarship.org/uc/item/38w6t5ds Wed, 8 Nov 2006 00:00:00 +0000 Proctor, Michael