Arid
DOI10.2307/1941559
ON DETERMINING THE STATISTICAL SIGNIFICANCE OF DISCONTINUITIES WITHIN ORDERED ECOLOGICAL DATA
CORNELIUS, JM; REYNOLDS, JF
来源期刊ECOLOGY
ISSN0012-9658
出版年1991
卷号72期号:6页码:2057-2070
英文摘要

Current ecological theory hypothesizes that boundaries between adjacent ecosystem units are important in determining ecosystem structure and function across heterogeneous landscapes, and that such boundaries are potentially important sites for early detection of global climate change effects. Hence, there is an increasing research effort to elucidate the structure and function of ecological boundaries. Yet traditional data analysis methods focus primarily on homogeneous units rather than on the boundaries between them; thus, new methods are being developed for detecting, characterizing and classifying boundaries, e.g., split moving-window boundary analysis (SMW). SMW is a simple yet sensitive method for locating discontinuities that may exist within multivariate, serial data (ordered in one dimension) at various scales relative to the length of the data series. However, SMW is subjective and relative, and therefore locates apparent discontinuities even within random, serial data. In this paper we present two nonparametric methods for determining the statistical significance of discontinuities detected by SMW. First, we describe a Monte Carlo method for determining the statistical significance of scale-dependent discontinuities (i.e., discontinuities that are significant relative to only one scale). Second, we propose a nonparametric, scale-independent method (it also is dependent upon scale size, but to a much lesser degree than the Monte Carlo method) that is more appropriate for locating statistically significant discontinuities that separate different, relatively homogeneous groups of varying size along a series. We examine the robustness of these two methods using computer-generated data having varying intensities of imposed discontinuities, and illustrate their application to locating boundaries between vegetation samples collected at systematic intervals across a desert landscape in southern New Mexico, USA.


英文关键词BOUNDARY DETECTION CONCENTRATION CONTOURS DISSIMILARITY PROFILE GRADIENT MONTE-CARLO SIMULATION NONMETRIC MULTIDIMENSIONAL SCALING NONPARAMETRIC ORDINATION PERMUTATION PROCEDURES SPATIAL PATTERN STATISTICAL METHODS TRANSECT
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1991GV76900015
WOS关键词PARTITIONING SOIL TRANSECTS ; EDGE-DETECTION ; PATTERN ; COMMUNITY ; ORDINATION ; VEGETATION ; GRADIENTS ; CALIFORNIA ; GRASSLAND ; BOUNDARY
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/126337
作者单位(1)SAN DIEGO STATE UNIV,SYST ECOL RES GRP,SAN DIEGO,CA 92182
推荐引用方式
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CORNELIUS, JM,REYNOLDS, JF. ON DETERMINING THE STATISTICAL SIGNIFICANCE OF DISCONTINUITIES WITHIN ORDERED ECOLOGICAL DATA[J],1991,72(6):2057-2070.
APA CORNELIUS, JM,&REYNOLDS, JF.(1991).ON DETERMINING THE STATISTICAL SIGNIFICANCE OF DISCONTINUITIES WITHIN ORDERED ECOLOGICAL DATA.ECOLOGY,72(6),2057-2070.
MLA CORNELIUS, JM,et al."ON DETERMINING THE STATISTICAL SIGNIFICANCE OF DISCONTINUITIES WITHIN ORDERED ECOLOGICAL DATA".ECOLOGY 72.6(1991):2057-2070.
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