VellendBjorkmanMcConchie2008

Référence

Vellend, M., Bjorkman, A.D. and McConchie, A. (2008) Environmentally biased fragmentation of oak savanna habitat on southeastern Vancouver Island, Canada. Biological Conservation, 141(10):2576-2584. (Scopus )

Résumé

Quantifying the degree to which natural or protected areas are representative of a specified baseline provides critical information to conservation prioritization schemes. We report results on southeastern Vancouver Island, Canada, where we compared environmental conditions represented across the entire landscape, in oak savanna habitats prior to European settlement (<1850), and in both protected and unprotected oak savannas in the present-day. In this region, oak savannas represent a rare habitat type, harboring many threatened species. Before European settlement, oak savannas occurred in a distinctly different subset of environmental conditions than they do today. Compared to the entire landscape, oak savannas were historically found predominantly in warm, dry, flat, and low-lying areas, but habitat destruction has left oak savannas in largely the exact opposite set of conditions at present. Thus, the range of conditions in both protected and unprotected oak savannas at present are highly unrepresentative of historical conditions. It appears that fire management by indigenous peoples maintained oak savannas historically across large areas of flat low-lying conditions with deep soils, where succession otherwise produces closed coniferous forest. These areas have since been almost entirely converted to agricultural and urban areas, leaving remnant oak savannas largely on steep, rocky hilltops, where the habitat is maintained by shallow soils. Our results provide quantitative guidance for setting conservation priorities for oak savannas in this region, while highlighting the important general issue of the major role traditional land-use practices can play in shaping landscapes, and therefore in influencing the baselines used to set conservation priorities. © 2008 Elsevier Ltd. All rights reserved.

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@ARTICLE { VellendBjorkmanMcConchie2008,
    AUTHOR = { Vellend, M. and Bjorkman, A.D. and McConchie, A. },
    TITLE = { Environmentally biased fragmentation of oak savanna habitat on southeastern Vancouver Island, Canada },
    JOURNAL = { Biological Conservation },
    YEAR = { 2008 },
    VOLUME = { 141 },
    PAGES = { 2576-2584 },
    NUMBER = { 10 },
    ABSTRACT = { Quantifying the degree to which natural or protected areas are representative of a specified baseline provides critical information to conservation prioritization schemes. We report results on southeastern Vancouver Island, Canada, where we compared environmental conditions represented across the entire landscape, in oak savanna habitats prior to European settlement (<1850), and in both protected and unprotected oak savannas in the present-day. In this region, oak savannas represent a rare habitat type, harboring many threatened species. Before European settlement, oak savannas occurred in a distinctly different subset of environmental conditions than they do today. Compared to the entire landscape, oak savannas were historically found predominantly in warm, dry, flat, and low-lying areas, but habitat destruction has left oak savannas in largely the exact opposite set of conditions at present. Thus, the range of conditions in both protected and unprotected oak savannas at present are highly unrepresentative of historical conditions. It appears that fire management by indigenous peoples maintained oak savannas historically across large areas of flat low-lying conditions with deep soils, where succession otherwise produces closed coniferous forest. These areas have since been almost entirely converted to agricultural and urban areas, leaving remnant oak savannas largely on steep, rocky hilltops, where the habitat is maintained by shallow soils. Our results provide quantitative guidance for setting conservation priorities for oak savannas in this region, while highlighting the important general issue of the major role traditional land-use practices can play in shaping landscapes, and therefore in influencing the baselines used to set conservation priorities. © 2008 Elsevier Ltd. All rights reserved. },
    COMMENT = { Cited By (since 1996): 4 Export Date: 11 March 2011 Source: Scopus CODEN: BICOB doi: 10.1016/j.biocon.2008.07.019 },
    ISSN = { 00063207 (ISSN) },
    KEYWORDS = { Climate, Conservation baselines, Indigenous land use, Oak savanna, Protected areas, Representativeness, coniferous forest, deciduous tree, endangered species, environmental conditions, environmental degradation, fire management, habitat fragmentation, habitat type, human settlement, indigenous population, island, land use change, protected area, savanna, succession, British Columbia, Canada, North America, Vancouver Island },
    OWNER = { Luc },
    TIMESTAMP = { 2011.03.11 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-52049084795&partnerID=40&md5=e6403efbab9ef629cf13dba04b47ca83 },
}

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