Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1365-2664.2011.01970.x |
Placing linkages among fragmented habitats: do least-cost models reflect how animals use landscapes? | |
Sawyer, Sarah C.1; Epps, Clinton W.2; Brashares, Justin S.1 | |
通讯作者 | Sawyer, Sarah C. |
来源期刊 | JOURNAL OF APPLIED ECOLOGY
![]() |
ISSN | 0021-8901 |
EISSN | 1365-2664 |
出版年 | 2011 |
卷号 | 48期号:3页码:668-678 |
英文摘要 | P>1. The need to conserve and create linkages among fragmented habitats has given rise to a range of techniques for maximizing connectivity. Methods to identify optimal habitat linkages face trade-offs between constraints on model inputs and biological relevance of model outputs. Given the popularity of these methods and their central role in landscape planning, it is critical that they be reliable and robust. 2. The most popular method used to inform habitat linkage design, least-cost path (LCP) analysis, designates a landscape resistance surface based on hypothetical ’costs’ that landscape components impose on species movement, and identifies paths that minimize cumulative costs between locations. 3. While LCP analysis represents a valuable method for conservation planning, its current application has several weaknesses. Here, we review LCP analysis and identify shortcomings of its current application that decrease biological relevance and conservation utility. We examine trends in published LCP analyses, demonstrate the implications of methodological choices with our own LCP analysis for bighorn sheep Ovis canadensis nelsoni, and point to future directions in cost modelling. 4. Our review highlights three weaknesses common in recent LCP analyses. First, LCP models typically rely on remotely sensed habitat maps, but few studies assess whether such maps are suitable proxies for factors affecting animal movement or consider the effects of adjacent habitats. Secondly, many studies use expert opinion to assign costs associated with landscape features, yet few validate these costs with empirical data or assess model sensitivity to errors in cost assignment. Thirdly, studies that consider multiple, alternative movement paths often propose width or length requirements for linkages without justification. 5. Synthesis and applications. LCP modelling and similar approaches to linkage design guide connectivity planning, yet often lack a biological or empirical foundation. Ecologists must clarify the biological processes on which resistance values are based, explicitly justify cost schemes and scale (grain) of analysis, evaluate the effects of landscape context and sensitivity to cost schemes, and strive to optimize cost schemes with empirical data. Research relating species’ fine-grain habitat use to movement across broad extents is desperately needed, as are methods to determine biologically relevant length and width restrictions for linkages. |
英文关键词 | animal movement connectivity corridor dispersal fragmentation linkage design model validation |
类型 | Review |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000290587100020 |
WOS关键词 | DESERT BIGHORN SHEEP ; GENE FLOW ; FLORIDA PANTHER ; CLIMATE-CHANGE ; FUNCTIONAL CONNECTIVITY ; CONSERVATION LANDSCAPE ; OPTIMIZING DISPERSAL ; RESOURCE SELECTION ; SCALE CONSERVATION ; CIRCUIT-THEORY |
WOS类目 | Biodiversity Conservation ; Ecology |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
来源机构 | University of California, Berkeley |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/168812 |
作者单位 | 1.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; 2.Oregon State Univ, Dept Fisheries & Wildlife, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Sawyer, Sarah C.,Epps, Clinton W.,Brashares, Justin S.. Placing linkages among fragmented habitats: do least-cost models reflect how animals use landscapes?[J]. University of California, Berkeley,2011,48(3):668-678. |
APA | Sawyer, Sarah C.,Epps, Clinton W.,&Brashares, Justin S..(2011).Placing linkages among fragmented habitats: do least-cost models reflect how animals use landscapes?.JOURNAL OF APPLIED ECOLOGY,48(3),668-678. |
MLA | Sawyer, Sarah C.,et al."Placing linkages among fragmented habitats: do least-cost models reflect how animals use landscapes?".JOURNAL OF APPLIED ECOLOGY 48.3(2011):668-678. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。