|
|
|
| Registros recuperados: 10.260 | |
|
|
| Comiskey, E. Jane; University of Tennessee; ecomiske@tiem.utk.edu; Bass, Jr., Oron L; Everglades National Park; Sonny_Bass@nps.gov; Gross, Louis J; University of Tennessee; gross@tiem.utk.edu; McBride, Roy T; Livestock Protection Company;; Salinas, Rene; University of Tennessee; salinas@tiem.utk.edu. |
| The endangered Florida panther (Puma concolor coryi) survives in an area of pronounced habitat diversity in southern Florida, occupying extensive home ranges that encompass a mosaic of habitats. Twenty-one years of daytime monitoring via radiotelemetry have provided substantial but incomplete information about panther ecology, mainly because this method fails to capture movement and habitat use between dusk and dawn, when panthers are most active. Broad characterizations of panther habitat suitability have nonetheless been derived from telemetry-based habitat selection studies, focusing narrowly on forests where daytime resting sites are often located. The resulting forest-centered view of panthers attributed their restricted distribution and absence of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Felis concolor coryi; Florida panther; Puma concolor coryi; Forested habitat; Endangered species; Fractal analysis; Habitat selection; Home range; Landscape conservation; Telemetry. |
| Ano: 2002 |
|
| |
|
| |
|
|
| Odion, Dennis; Marine Science Institute, University of California, Santa Barbara; dennisodion@home.com; Tyler, Claudia; Institute for Computational Earth Systems Science; tyler@lifesci.ucsb.edu. |
| Morro manazanita (Arctostaphylos morroensis) is a distinctive shrub restricted to a small area along the coast of California, USA. This endangered species faces two opposing fire-related extinction risks: (1) adults are killed by fire, and (2) recruitment opportunities only occur with fire. These strongly limit the capacity of this, as well as other obligate-seeding species, to recover from a population decline, which may result if there is an inadequate amount of time between fires for replenishment of sufficient seed populations. Using a prescribed burn, we tested whether the size of the seed bank that had accumulated in a 40-yr-old stand would prove adequate for maintaining A. morroensis population sizes through fire. Prior to the burn, we found ~11,000... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Arctostaphylos morroensis; California coast; Endangered species; Fire-dependent germination; Fire-related extinction risk; Maritime chaparral; Morro manzanita; Obligate-seeder; Postfire seedling recruitment; Seed bank; Shrublands; Viable seed. |
| Ano: 2002 |
|
| |
|
| |
|
|
| Hull, R. Bruce; Virginia Polytechnic Institute and State University; hullrb@vt.edu; Robertson, David P; Virginia Polytechnic Institute and State University; porter@vt.edu; Buhyoff, Gregory J; Virginia Department of Conservation and Recreation; drichert@dcr.state.va.us; Seekamp, Erin; College of Natural Resources, Virginia Tech; redheaderin@hotmail.com; Buhyoff, Gregory J; College of Natural Resources, Virginia Tech; buhyoff@vt.edu. |
| Assumptions about nature are embedded in people’s preferences for environmental policy and management. The people we interviewed justified preservationist policies using four assumptions about nature knowing best: nature is balanced, evolution is progressive, technology is suspect, and the Creation is perfect. They justified interventionist policies using three assumptions about nature: it is dynamic, inefficient, and robust. Unstated assumptions about temporal, spatial, and organizational scales further confuse discussions about nature. These findings confirm and extend findings from previous research. Data for our study were derived from interviews with people actively involved in negotiating the fate of forest ecosystems in southwest Virginia:... |
| Tipo: Peer-Reviewed Reports |
|
| Ano: 2002 |
|
| |
|
| |
|
| |
|
| |
|
|
| Lertzman, Ken; Simon Fraser University; lertzman@sfu.ca; Gavin, Daniel; Department of Plant Biology, University of Illinois, Urbana, IL 61801, USA; dgavin@life.uiuc.edu; Hallett, Douglas; Center for Environmental Sciences & Quaternary Sciences Program, Northern Arizon; Douglas.Hallett@NAU.EDU; Brubaker, Linda; College of Forest Resources, University of Washington, Seattle, WA 98195, USA; lbru@u.washington.edu; Lepofsky, Dana; Simon Fraser University; dlepofsk@sfu.ca; Mathewes, Rolf; Department of Biological Sciences, Simon Fraser University; mathewes@sfu.ca. |
| Coastal temperate rainforests from southeast Alaska through to southern Oregon are ecologically distinct from forests of neighboring regions, which have a drier, or more continental, climate and disturbance regimes dominated by fires. The long-term role of fire remains one of the key outstanding sources of uncertainty in the historical dynamics of the wetter and less seasonal forests that dominate the northerly two thirds of the rainforest region in British Columbia and Alaska. Here, we describe the long-term fire regime in two forests on the south coast of British Columbia by means of 244 AMS radiocarbon dates of charcoal buried in forest soils. In both forests, some sites have experienced no fire over the last 6000 years and many other sites have... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Clayoquot Sound; Fraser Valley; Coastal temperate rainforests; Fire intervals; Long-term fire regime; Soil carbon storage; Soil charcoal; Sub-alpine forest; Time-since-fire. |
| Ano: 2002 |
|
| |
|
|
| Perrings, Charles; University of York; cap8@york.ac.uk; Williamson, Mark; University of York; mw1@york.ac.uk; Barbier, Edward B; University of Wyoming; ebarbier@uwyo.edu; Delfino, Doriana; University of York; dd109@york.ac.uk; Dalmazzone, Silvana; University of Turin; silvana.dalmazzone@unito.it; Shogren, Jason; University of Wyoming; jramses@uwyo.edu; Simmons, Peter; University of York; ps1@york.ac.uk; Watkinson, Andrew; University of East Anglia; A.Watkinson@uea.ac.uk. |
| We postulate that the causes of the problem of invasive alien species are primarily economic and, as such, require economic solutions. Invasive alien species are of increasing concern for four reasons. First, introductions are increasing sharply, while mechanisms for excluding or eradicating alien species have been either withdrawn or progressively weakened. Both trends are due to the liberalization of and increase in international travel and trade, an economic phenomenon. Second, the costs of invasions are rising rapidly due partly to increasing human population density, and partly to increasing intensity of production in genetically impoverished agricultural systems. Third, biological invasions are associated with a high degree of uncertainty both... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Invasive species. |
| Ano: 2002 |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Sayer, Jeffrey A; WWF (World Wildlife Fund); jsayer@wwfint.org; Campbell, Bruce; Center for International Forestry Research (CIFOR); b.campbell@cgiar.org. |
| To meet the challenges of poverty and environmental sustainability, a different kind of research will be needed. This research will need to embrace the complexity of these systems by redirecting the objectives of research toward enhancing adaptive capacity, by incorporating more participatory approaches, by embracing key principles such as multi-scale analysis and intervention, and by the use of a variety of tools (e.g., systems analysis, information management tools, and impact assessment tools). Integration will be the key concept in the new approach; integration across scales, components, stakeholders, and disciplines. Integrated approaches, as described in this Special Feature, will require changes in the culture and organization of research. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive capacity; Decision making; Impact assessment; Integration; Scale; Social learning; Systems modeling.. |
| Ano: 2002 |
|
| |
|
| |
|
|
| Voinov, Alexey; IEE UMCES; voinov@cbl.umces.edu. |
| A framework for web-based collaborative teaching has been created. This framework is implemented as an ecological modeling course (http://iee.umces.edu/AV/Simmod.html), but should be flexible enough to apply to other disciplines. I have developed a series of tools to facilitate interactive communication between students and instructors, and among students taking the course. The course content consists of reading materials that describe the theory of systems analysis and modeling, guidelines on how models can be built, and numerous examples and illustrations. The interactive part includes exercises that can be discussed with and evaluated by the instructor, and provides a means to mimic class discussions. To what extent this approach can replace... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Collaborative teaching; Ecological modeling; Interactivity; Open source; Web education. |
| Ano: 2002 |
|
| |
|
| |
| Registros recuperados: 10.260 | |
|
|
|
