Olden Julian D, Jackson Donald A, Peres-Neto Pedro R
Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, Ontario, M5S 3G5, Canada.
Oecologia. 2001 May;127(4):572-585. doi: 10.1007/s004420000620. Epub 2001 May 1.
Fifty-two drainage lakes, located in south-central Ontario, Canada, were examined to study the association of isolation- and environment-related factors with fish community composition. Eight quantitative measures of lake isolation were examined, each of which incorporated potential ecological "challenges" that a fish encounters when moving between lakes. A Procrustean approach was employed to assess the degree of concordance between fish assemblage structure, measures of lake isolation and environmental conditions (i.e., lake morphology and water chemistry). Our results revealed a high concordance between patterns in fish community composition and lake isolation and lake morphology at the watershed scale, suggesting that insular and habitat-related factors influence the structure of fish communities. At the scale of the individual lake, this relationship varied greatly, ranging from a strong match of community composition with both spatial and abiotic conditions to communities exhibiting weak association with these conditions. Furthermore, we showed that alternative measures of lake isolation provide additional insight into potential factors shaping patterns in fish community composition; information not provided using straight-line distances between lakes. Finally, the statistical methodology outlined in this paper provides a robust technique for assessing both the overall association between multivariate data matrices (i.e., landscape or regional scale), as well as facilitating the examination of smaller-scale relationships of individual observations (i.e., local scale).
对位于加拿大安大略省中南部的52个排水湖进行了调查，以研究与隔离和环境相关的因素与鱼类群落组成之间的关联。研究了八种湖泊隔离的定量指标，每个指标都纳入了鱼类在湖泊之间移动时可能遇到的潜在生态“挑战”。采用了一种普罗克汝斯忒斯方法来评估鱼类组合结构、湖泊隔离指标和环境条件（即湖泊形态和水化学）之间的一致程度。我们的结果表明，在流域尺度上，鱼类群落组成模式与湖泊隔离和湖泊形态之间存在高度一致性，这表明岛屿相关和栖息地相关因素会影响鱼类群落的结构。在单个湖泊尺度上，这种关系差异很大，从群落组成与空间和非生物条件的强烈匹配到与这些条件关联较弱的群落。此外，我们表明，湖泊隔离的替代指标为塑造鱼类群落组成模式的潜在因素提供了额外的见解；而使用湖泊之间的直线距离无法提供这些信息。最后，本文概述的统计方法提供了一种强大的技术，用于评估多变量数据矩阵之间的整体关联（即景观或区域尺度），同时也便于检验单个观测值的较小尺度关系（即局部尺度）。
