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Schwellenwerte der Landschaftszerschneidung Schwellenwerte der Landschaftszerschneidung

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Landscape fragmentation adversely affects wildlife populations by reducing the amount and quality of habitat, increasing the number and strength of barriers to movement, enhancing mortality due to collisions with vehicles, and breaking up the remaining habitat into smaller pieces. All four mechanisms exhibit critical thresholds, below which the population is prone to a much higher risk of extinction. However, empirical determination of these thresholds in real landscapes (e.g., by using molecular-genetic methods) is very difficult due to long time lags in population reactions ("extinction debt"), and due to many confounding ecological variables. As a consequence, better policies, decisionmaking procedures, and planning tools are needed that are based on the precautionary principle and on prospective simulation models, e.g., quantitative environmental standards limiting the degree of landscape fragmentation and precautionary assessment criteria.

German
Landscape fragmentation adversely affects wildlife populations by reducing the amount and quality of habitat, increasing the number and strength of barriers to movement, enhancing mortality due to collisions with vehicles, and breaking up the remaining habitat into smaller pieces. All four mechanisms exhibit critical thresholds, below which the population is prone to a much higher risk of extinction. However, empirical determination of these thresholds in real landscapes (e.g., by using molecular-genetic methods) is very difficult due to long time lags in population reactions ("extinction debt"), and due to many confounding ecological variables. As a consequence, better policies, decisionmaking procedures, and planning tools are needed that are based on the precautionary principle and on prospective simulation models, e.g., quantitative environmental standards limiting the degree of landscape fragmentation and precautionary assessment criteria.
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Keywords: BARRIER EFFECT; CONNECTIVITY; DEMOGRAPHIC STOCHASTICITY; EXTINCTION THRESHOLDS; GENE FLOW; HABITAT FRAGMENTATION; INBREEDING; LANDSCAPE FRAGMENTATION; MINIMUM VIABLE POPULATION SIZE; POPULATION PERSISTENCE; POPULATION VIABILITY ANALYSIS (PVA); ROADS; TRAFFIC MORTALITY

Language: German

Document Type: Research Article

Publication date: June 1, 2005

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  • GAIA is a peer-reviewed inter- and transdisciplinary journal for scientists and other interested parties concerned with the causes and analyses of environmental and sustainability problems and their solutions.

    Environmental problems cannot be solved by one academic discipline. The complex natures of these problems require cooperation across disciplinary boundaries. Since 1991, GAIA has offered a well-balanced and practice-oriented forum for transdisciplinary research. GAIA offers first-hand information on state of the art environmental research and on current solutions to environmental problems. Well-known editors, advisors, and authors work to ensure the high quality of the contributions found in GAIA and a unique transdisciplinary dialogue – in a comprehensible style.

    GAIA is an ISI-journal, listed in the Science Citation Index Expanded, Social Science Citation Index and in Current Contents/Social and Behavioral Sciences.

    All contributions undergo a double-blind peer review.

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