Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain
[EN] We developed a conceptual framework for classifying habitat quality that requires the construc- tion of separate habitat models for each key demographic feature; the framework can be applied when the factors that determine different demographic processes differ substantially. For example, survi...
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ftcsic:oai:digital.csic.es:10261/50293 2024-02-11T10:09:21+01:00 Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain Especies Amenazadas Limitadas por Factores Naturales y Humanos: el Caso del Oso Pardo en el Norte de España Naves, Javier Wiegand, Thorsten Revilla, Eloy Delibes, M. 2003-10 http://hdl.handle.net/10261/50293 https://doi.org/10.1046/j.1523-1739.2003.02144.x en eng Society for Conservation Biology http://dx.doi.org/10.1046/j.1523-1739.2003.02144.x Conservation Biology, Pages 1276–1289 Volume 17, No. 5, 2003 http://hdl.handle.net/10261/50293 doi:10.1046/j.1523-1739.2003.02144.x open artículo http://purl.org/coar/resource_type/c_6501 2003 ftcsic https://doi.org/10.1046/j.1523-1739.2003.02144.x 2024-01-16T09:38:05Z [EN] We developed a conceptual framework for classifying habitat quality that requires the construc- tion of separate habitat models for each key demographic feature; the framework can be applied when the factors that determine different demographic processes differ substantially. For example, survival of large car- nivores is mainly determined by human-induced mortality, whereas nutritional condition determines repro- ductive rate. Hence, a two-dimensional habitat model built for reproduction and survival yields five hypothet- ical habitat categories: matrix, with no reproduction and/or very high mortality; sink, with low reproduction and high mortality; refuge, with low reproduction and low mortality; attractive sink, with high reproduction and high mortality; and source, with high reproduction and low mortality. We applied this framework to two endangered brown bear ( Ursus arctos ) populations in the Cantabrian Mountains, Spain. Our aim was to gen- erate working hypotheses about the quality and spatial arrangement of bear habitat to analyze the present conditions of the different population nuclei and to facilitate identification of core areas of high conservation value, conflictive areas, or areas with unoccupied potential habitat. We used a geographic information system and two spatial long-term data sets on presence and reproduction and performed logistic regressions for building a two-dimensional model. The analysis reveals that both populations exist under different subopti- mal conditions: the eastern population mainly occupies areas of suboptimal natural habitat and relatively low human impact, whereas the western population is located mainly in areas with high human impact but otherwise good natural quality. To test hypotheses about demographic features of the obtained habitat cate- gories, we classified data on historic extinction in northern Spain ( fourteenth to nineteenth centuries ) with the two-dimensional model. Extinction probabilities within each habitat category confirmed the hypotheses: ... Article in Journal/Newspaper Ursus arctos Digital.CSIC (Spanish National Research Council) Conservation Biology 17 5 1276 1289 |
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Digital.CSIC (Spanish National Research Council) |
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English |
description |
[EN] We developed a conceptual framework for classifying habitat quality that requires the construc- tion of separate habitat models for each key demographic feature; the framework can be applied when the factors that determine different demographic processes differ substantially. For example, survival of large car- nivores is mainly determined by human-induced mortality, whereas nutritional condition determines repro- ductive rate. Hence, a two-dimensional habitat model built for reproduction and survival yields five hypothet- ical habitat categories: matrix, with no reproduction and/or very high mortality; sink, with low reproduction and high mortality; refuge, with low reproduction and low mortality; attractive sink, with high reproduction and high mortality; and source, with high reproduction and low mortality. We applied this framework to two endangered brown bear ( Ursus arctos ) populations in the Cantabrian Mountains, Spain. Our aim was to gen- erate working hypotheses about the quality and spatial arrangement of bear habitat to analyze the present conditions of the different population nuclei and to facilitate identification of core areas of high conservation value, conflictive areas, or areas with unoccupied potential habitat. We used a geographic information system and two spatial long-term data sets on presence and reproduction and performed logistic regressions for building a two-dimensional model. The analysis reveals that both populations exist under different subopti- mal conditions: the eastern population mainly occupies areas of suboptimal natural habitat and relatively low human impact, whereas the western population is located mainly in areas with high human impact but otherwise good natural quality. To test hypotheses about demographic features of the obtained habitat cate- gories, we classified data on historic extinction in northern Spain ( fourteenth to nineteenth centuries ) with the two-dimensional model. Extinction probabilities within each habitat category confirmed the hypotheses: ... |
format |
Article in Journal/Newspaper |
author |
Naves, Javier Wiegand, Thorsten Revilla, Eloy Delibes, M. |
spellingShingle |
Naves, Javier Wiegand, Thorsten Revilla, Eloy Delibes, M. Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
author_facet |
Naves, Javier Wiegand, Thorsten Revilla, Eloy Delibes, M. |
author_sort |
Naves, Javier |
title |
Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
title_short |
Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
title_full |
Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
title_fullStr |
Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
title_full_unstemmed |
Endangered Species Constrained by Natural and Human Factors: the Case of Brown Bears in Northern Spain |
title_sort |
endangered species constrained by natural and human factors: the case of brown bears in northern spain |
publisher |
Society for Conservation Biology |
publishDate |
2003 |
url |
http://hdl.handle.net/10261/50293 https://doi.org/10.1046/j.1523-1739.2003.02144.x |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_relation |
http://dx.doi.org/10.1046/j.1523-1739.2003.02144.x Conservation Biology, Pages 1276–1289 Volume 17, No. 5, 2003 http://hdl.handle.net/10261/50293 doi:10.1046/j.1523-1739.2003.02144.x |
op_rights |
open |
op_doi |
https://doi.org/10.1046/j.1523-1739.2003.02144.x |
container_title |
Conservation Biology |
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17 |
container_issue |
5 |
container_start_page |
1276 |
op_container_end_page |
1289 |
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1790609206027485184 |