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Using Ants as bioindicators: Multiscale Issues in Ant Community Ecology Ecology and Society
Andersen, Alan; Wildlife and Ecology, CSIRO Tropical Ecosystems Research Centre; Alan.Andersen@terc.csiro.au.
Ecological patterns and processes are characteristically scale dependent, and research findings often cannot be translated easily from one scale to another. Conservation biology is challenged by a lack of congruence between the spatial scales of ecological research (typically involving small plots) and land management (typically involving whole landscapes). Here, I discuss spatial scaling issues as they relate to an understanding of ant communities and, consequently, their use as bioindicators in land management. Our perceptions of fundamental patterns and processes in ant communities depend on scale: taxa that are behaviorally dominant at one scale are not necessarily so at others, functional groups recognized at one scale are often inappropriate for...
Tipo: Peer-Reviewed Reports Palavras-chave: Ants; Biodiversity surrogacy; Bioindicators; Community; Diversity patterns; Functional groups; Multiscale; Spatial scale..
Ano: 1997
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Bridging the Gap between Ecology and Resource Management Ecology and Society
Pulliam, Ron; ; pulliam@ecology.uga.edu.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Commentary on Gordon Baskerville's Perspective Ecology and Society
Gallopin, Gilberto C; Economic Commission for Latin America and the Caribbean, Environment and Human S; ggallopin@eclac.cl.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Commentary on Gordon Baskerville's Perspective Ecology and Society
Fujii, Koichi; university; fujiiko@sakura.cc.tsukuba.ac.jp.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Commentary on Gordon Baskerville's Perspective Ecology and Society
Franklin, Jerry; University of Washington; jff@u.washington.edu.
Tipo: Peer-Reviewed Reports
Ano: 1997
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The Multifaceted Aspects of Ecosystem Integrity Ecology and Society
De Leo, Giulio A; Agenzia Regionale per la Protezione dell' Ambiente; deleo@dsa.unipr.it; Levin, Simon A; Princeton University; slevin@eno.princeton.edu.
The need to reduce human impacts on ecosystems creates pressure for adequate response, but the rush to solutions fosters the oversimplification of such notions as sustainable development and ecosystem health. Hence, it favors the tendency to ignore the complexity of natural systems. In this paper, after a brief analysis of the use and abuse of the notion of ecosystem health, we address the problem of a sound definition of ecosystem integrity, critically review the different methodological and conceptual approaches to the management of natural resources, and sketch the practical implications stemming from their implementation. We show thatthere are merits and limitations in different definitions of ecosystem integrity, for each acknowledges different...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Biodiversity; Complexity and stability; Conservation strategies; Disturbance anthropogenic; Disturbance natural; Ecosystem integrity; Ecosystem functioning; Ecosytem structure; Natural resource management; Resilience; Sustainable development..
Ano: 1997
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Detecting Critical Scales in Fragmented Landscapes Ecology and Society
Keitt, Timothy; State University of New York at Stony Brook; Timothy.Keitt@StonyBrook.Edu; Urban, Dean L; Duke University; deanu@pinus.env.duke.edu; Milne, Bruce T; University of New Mexico; bmilne@sevilleta.unm.edu.
We develop methods for quantifying habitat connectivity at multiple scales and assigning conservation priority to habitat patches based on their contribution to connectivity. By representing the habitat mosaic as a mathematical "graph," we show that percolation theory can be used to quantify connectivity at multiple scales from empirical landscape data. Our results indicate that connectivity of landscapes is highly scale dependent, exhibiting a marked transition at a characteristic distance and varying significantly for organisms with different dispersal behavior. More importantly, we show that the sensitivity and importance of landscape pattern is also scale dependent, peaking at scales associated with the percolation transition. In addition, the...
Tipo: Peer-Reviewed Reports Palavras-chave: Connectivity; Conservation in fragmented landscapes; Dispersal; Fragmentation; Habitat connectivity vs. dispersal distance; Landscape; Landscape graphs; Metapopulation; Percolation; Quantifying habitat connectivity at multiple scales; "stepping stone" patch; Strix occidentalis lucida..
Ano: 1997
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Advocacy, Science, Policy, and Life in the Real World Ecology and Society
Baskerville, Gordon; ; basker@unixg.ubc.ca.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Resilience and Restoration of Lakes Ecology and Society
Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu; Cottingham, Kathryn L; ; cottingh@nceas.ucsb.edu.
Lake water quality and ecosystem services are normally maintained by several feedbacks. Among these are nutrient retention and humic production by wetlands, nutrient retention and woody habitat production by riparian forests, food web structures that cha nnel phosphorus to consumers rather than phytoplankton, and biogeochemical mechanisms that inhibit phosphorus recycling from sediments. In degraded lakes, these resilience mechanisms are replaced by new ones that connect lakes to larger, regional economi c and social systems. New controls that maintain degraded lakes include runoff from agricultural and urban areas, absence of wetlands and riparian forests, and changes in lake food webs and biogeochemistry that channel phosphorus to blooms of nuisance...
Tipo: Peer-Reviewed Reports Palavras-chave: Ecological economics; Ecosystem; Eutrophication; Lake; Resilience; Restoration; Watershed..
Ano: 1997
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Challenges in adaptive management of riparian and coastal ecosystems Ecology and Society
Walters, Carl; University of British Columbia; c.walters@fisheries.ubc.ca.
Many case studies in adaptive-management planning for riparian ecosystems have failed to produce useful models for policy comparison or good experimental management plans for resolving key uncertainties. Modeling efforts have been plagued by difficulties in representation of cross-scale effects (from rapid hydrologic change to long-term ecological response), lack of data on key processes that are difficult to study, and confounding of factor effects in validation data. Experimental policies have been seen as too costly or risky, particularly in relation to monitoring costs and risk to sensitive species. Research and management stakeholders have shown deplorable self-interest, seeing adaptive-policy development as a threat to existing research programs and...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Coastal ecosystems; Ecosystem management; Fisheries; Institutional barriers; Management experiments; Modeling; Riparian ecosystems; Simulation.
Ano: 1997
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The Relations Among Threatened Species, Their Protection, and Taboos Ecology and Society
Colding, Johan; Stockholm University and Royal Swedish Academy of Sciences; johanc@beijer.kva.se; Folke, Carl; Stockholm University; calle@system.ecology.su.se.
We analyzed the role of taboos for the protection of species listed as "threatened" by the World Conservation Union (IUCN), and also for species known to be endemic and keystone. The study was limited to taboos that totally avoid or prohibit any use of particular species and their populations. We call them specific-species taboos . Through a literature review, 70 currently existing examples of specific-species taboos were identified and analyzed. The species avoided were grouped into biological classes. Threat categories were determined for each species, based on the IUCN Red Data Book. We found that ~ 30% of the identified taboos prohibit any use of species listed as threatened by IUCN. Of the specific-species taboos, 60% are set on reptiles and mammals....
Tipo: Peer-Reviewed Reports Palavras-chave: Endemic species; Keystone species; Nature conservation; Taboos; Threatened species; Traditional societies..
Ano: 1997
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Uncertainty, Climate Change, and Adaptive Management Ecology and Society
Peterson, Garry; McGill University; garry.peterson@mcgill.ca; De Leo, Giulio A; Agenzia Regionale per la Protezione dell' Ambiente; deleo@dsa.unipr.it; Hellmann, Jessica J; Stanford University; jessicah@leland.stanford.edu; Janssen, Marco A; Indiana University; maajanss@indiana.edu; Kinzig, Ann; Arizona State University; Ann.Kinzig@asu.edu; Malcolm, Jay R; University of Toronto; jay.malcolm@utoronto.ca; O'Brien, Karen L; -; kobrien@online.no; Pope, Shealagh E; Environment Canada; shealagh.pope@ec.gc.ca; Rothman, Dale S; Columbia University; drothman@bio2.edu; Shevliakova, Elena; Carnegie Mellon University; lenish@cmu.edu; Tinch, Robert R.T.; York University, UK; rrtt100@york.ac.uk.
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Climate change; Global change; Uncertainty; Models.
Ano: 1997
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The Inaugural Issue of Conservation Ecology Ecology and Society
Holling, C. S.; University of Florida; holling@zoo.ufl.edu.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Ecology, Ethics, and Advocacy Ecology and Society
Peterson, Garry; McGill University; garry.peterson@mcgill.ca; Pope, Shealagh E; Environment Canada; shealagh.pope@ec.gc.ca; De Leo, Giulio Alessandro; Agenzia Regionale per la Protezione dell' Ambiente; deleo@dsa.unipr.it; Janssen, Marco A; National Institute for Public Health and the Environment, The Netherlands; marco.janssen@rivm.nl; Malcolm, Jay R; Department of Forestry, University of Toronto, Canada; jay.malcolm@utoronto.ca; Parody, Jennifer M; Department of Biological Sciences, University of New Mexico, USA; jmparody@unm.edu; Hood, Greg; Australian National University/CSIRO, Australia; greg.hood@dwe.csiro.au; North, Malcolm; U.S. Forest Service, Pacific Southwest Research Station, USA; north_md@msn.com.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Commentary on Gordon Baskerville's Perspective Ecology and Society
Walker, Brian; CSIRO Sustainable Ecosystems; Brian.Walker@csiro.au.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Sustainability, Stability, and Resilience Ecology and Society
Ludwig, Don; University of British Columbia; ludwig@math.ubc.ca; Walker, Brian; CSIRO Sustainable Ecosystems; Brian.Walker@csiro.au; Holling, C. S.; University of Florida; holling@zoo.ufl.edu.
The purpose of this essay is to define and refine the concepts of stability and resilience and to demonstrate their value in understanding the behavior of exploited systems. Some ecological systems display several possible stable states. They may also show a hysteresis effect in which, even after a long time, the state of the system may be partly determined by its history. The concept of resilience depends upon our objectives, the types of disturbances that we anticipate, control measures that are available, and the time scale of interest.
Tipo: Peer-Reviewed Reports Palavras-chave: Bifurcation; Multiple stable states; Resilience; Stability..
Ano: 1997
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An Overview of the Implications of Global Change for Natural and Managed Terrestrial Ecosystems Ecology and Society
Walker, Brian; CSIRO Sustainable Ecosystems; Brian.Walker@csiro.au; Steffen, Will; ; Will.Steffen@dwe.csiro.au.
Global change is the net effect of individual and interactive effects of changes in land use, atmospheric composition, biological diversity, and climate. A synthesis of the past six years' activities of the Global Change and Terrestrial Ecosystems project of the IGBP (International Geosphere-Biosphere Programme) deals with global change effects as ecosystem responses and living with global change. Ecosystem responses are considered in terms of changes in function and vegetation composition/structure. Field experiments of elevated CO2 effects on aboveground biomass show, on average, a positive effect on biomass, ranging from -20% to +80%. Some early predictions of CO2 effects (C3 vs. C4 plants, N-fixers, C:N in litter) are not generally supported, and it...
Tipo: Peer-Reviewed Reports Palavras-chave: Agriculture; Biomes; Carbon dioxide; Climate; Dynamics; Ecosystem functioning; Global change; Impacts; Land use; Terrestrial biosphere; Vegetation changes..
Ano: 1997
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Scientific Responsibility and Responsible Ecology Ecology and Society
Wiens, John A; ; jaws@lamar.colostate.edu.
Tipo: Peer-Reviewed Reports
Ano: 1997
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Automated Techniques for the Qualitative Analysis of Ecological Models: Continuous Models Ecology and Society
van Coller, Lynn; UBC; lvcoller@nbs.co.za.
The mathematics required for a detailed analysis of the behavior of a model can be formidable. In this paper, I demonstrate how various computer packages can aid qualitative analyses by implementing techniques from dynamical systems theory. Because computer software is used to obtain the results, the techniques can be used by nonmathematicians as well as mathematicians. In-depth analyses of complicated models that were previously very difficult to study can now be done. Because the paper is intended as an introduction to applying the techniques to ecological models, I have included an appendix describing some of the ideas and terminology. A second appendix shows how the techniques can be applied to a fairly simple predator-prey model and establishes the...
Tipo: Peer-Reviewed Reports Palavras-chave: Bifurcation; Computer analysis; Dynamical systems; Ecological models; Qualitative analysis; Ratio-dependent model; XPPAUT..
Ano: 1997
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Regional Responses to Global Change Ecology and Society
Holling, C. S.; University of Florida; holling@zoo.ufl.edu.
Tipo: Peer-Reviewed Reports
Ano: 1997
Registros recuperados: 2.004
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