Multi-response permutation procedures for a priori classifications

Mielke, Paul W.; Berry, Kenneth J.; Johnson, Earl S.

doi:10.1080/03610927608827451

Cited by 275 publications

(136 citation statements)

References 5 publications

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“…Samples were classified into clusters based on similarities of community composition. A multi-response permutation procedure (MRPP; Mielke et al, 1976), a non-parametric method for testing the hypothesis of "no difference between two or more groups of entities", was used to evaluate the statistical significance of the clusters. Cluster analysis and the MRPP were conducted using PC-Ord (McCune and Mefford, 1999).…”

Section: Discussionmentioning

confidence: 99%

Distribution of benthic diatoms in Korean rivers and streams in relation to environmental variables

Hwang

Kim

Yoon

et al. 2011

Ann. Limnol. - Int. J. Lim.

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-The diatoms are an ecologically important group of algae that have been extensively studied by ecologists and taxonomists. However, the large-scale patterns of diatom distribution and the factors underlying this distribution are largely unknown. The aims of this study were to identify the large-scale spatial patterns of benthic diatom assemblages in Korean streams and rivers, and to assess the importance of numerous environmental factors on diatom distribution. We classified 720 study sites based on diatom flora. Benthic diatoms, water chemistry, altitude, and riparian land cover and use were characterized by multivariate analyses, Monte Carlo permutation tests, and indicator species analysis. In total, we identified 531 diatom taxa. Diatom assemblages were mostly dominated by species of the genera Achnanthes, Navicula, Nitzschia, Cocconeis, Fragilaria (Synedra included), Cymbella, Gomphonema, and Melosira. Cluster analysis partitioned all 720 sites into eight groups based on diatom species composition. Canonical correspondence analysis indicated that altitude, land cover and use, current velocity, electrical conductivity, and nutrient levels explained a significant amount of the variation in the composition of assemblages of benthic diatoms. At the national scale, a downstream ecological gradient was apparent, from fast-flowing, mostly oligotrophic highland streams to slow-flowing, mostly eutrophic lowland rivers. Our data suggest that spatial factors explain some of the variation in diatom distribution. The present investigation of the spatial patterns of benthic diatoms, the ecological determinants of diatom occurrence, and the identification of diatom indicator species contributes to development of a program for assessing the biological integrity of lotic ecosystems in Korea.

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Section: Discussionmentioning

confidence: 99%

Distribution of benthic diatoms in Korean rivers and streams in relation to environmental variables

Hwang

Kim

Yoon

et al. 2011

Ann. Limnol. - Int. J. Lim.

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“…The distance (kilometres) between the centroids of pack home ranges between the two periods and between seasons was also calculated. Multiple response permutation procedures (MRPPs; Mielke et al 1976) were used to examine changes in distributions of coyote locations or space-use patterns between the two periods, to elucidate changes in the internal structure of the home range. MRPPs compare the observed intragroup (for example, pack or season locations) average distances between any two locations with the average distances that would have resulted from all possible combinations of intergroup locations under the null hypothesis.…”

Section: Methodsmentioning

confidence: 99%

Long-term spatial stability of coyote (Canis latrans) home ranges in southeastern Colorado

Kitchen¹,

Gese²,

Schauster³

2000

Can. J. Zool.

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Long-term stability of territorial boundaries has not been well documented in canids. To evaluate the prevalence of long-term spatial stability of coyote (Canis latrans) home ranges, we compared the overlap of territorial boundaries and the spatial distribution of telemetry locations of packs in southeastern Colorado. From August 1983 to July 1988 (period l), 16 coyotes from six packs were radio-tracked. From April 1996 to August 1997 (period 2), 12 coyotes from six packs were captured and tracked in the same area. Mean percentage of overlap of pack ranges was 89.8 * 8.3% (+SD) for period 1 ranges over period 2 ranges and 55.8 * 14.4% for period 2 ranges over period 1 ranges. Mean percentage of overlap of the 30% core area of the home ranges was 65.2 * 13.9% for those of period 1 over those of period 2 and 66.3 * 28.7% for those of period 2 over those of period 1. Despite substantial overlap of home-range and core-use areas, there were significant differences in the distribution of locations between periods in five of six home ranges. This suggests that, although packs are faithful to one site (i.e., boundaries remain similar over a period of years), their use of the site (i.e., distribution of locations within the range) may change temporally.RCsumC : La stabilitC B long terme des limites territoriales chez les canidCs est encore ma1 connue. Dans le but d7Cvaluer la stabilitC spatiale B long terme des domaines chez le Coyote (Canis latrans), nous avons comparC le chevauchement des limites territoriales et la rkpartition spatiale des repCrages ttltmCtriques chez des meutes du sud-est du Colorado. D'aoQt 1983 B juillet 1998 (pCriode l), 16 coyotes appartenant B six meutes on Ct C repCrCs par radio. D'avril 1996 B aoQt 1997 (pkriode 2), 12 coyotes appartenant B six meutes ont Ct C capturks et suivis dans la meme zone. Le chevauchement moyen des meutes exprim6 en pourcentage a Ct C de 89,8 * 8,3 % (Ccart type) dans le cas des domaines enregistrks durant la pCriode 1 par rapport B ceux enregistrCs durant la ptriode 2 et de 55,8 * 14,4 % dans le cas des domaines enregistres durant la pCriode 2 par rapport B ceux de la pCriode 1. Le chevauchement moyen de la portion centrale (30 %) des domaines a Ct C de 65,2 rt 13,9 % (pCriode 1 sur pCriode 2) et de 66,3 * 28,7 % (pCriode 2 sur PCriode 1). En dCpit du chevauchement important des domaines et des zones-centrales, il y avait des diffkrences significatives de la rCpartition des sites de repCrage entre les pCriodes dans cinq des six domaines. Ces rCsultats indiquent que malgrC la fidClitC des meutes B un endroit (i.e., similitude des limites durant plusieurs annCes), l'utilisation de l'endroit (i.e., rCpartition des sites de repCrage dans le domaine) peut changer temporairement.[Traduit par la RCdaction]

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“…Samples for each water depth were classified into clusters based on the similarities of their community composition. A multiresponse permutation procedure (MRPP; Mielke et al, 1976), which is a nonparametric procedure for testing the hypothesis of no difference between two or more groups of entities, was conducted to evaluate the significance of the clusters. Cluster analysis and MRPP were conducted using PCORD (McCune and Mefford, 1999).…”

Section: Discussionmentioning

confidence: 99%

Temporal changes of phytoplankton community at different depths of a shallow hypertrophic reservoir in relation to environmental variables

Kwon

Hwang

Park

et al. 2009

Ann. Limnol. - Int. J. Lim.

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-We characterized phytoplankton community succession at different depths of a shallow hypertrophic reservoir in relation to physical and chemical environmental variables. The phytoplankton community was sampled biweekly at three different water depths (surface, middle and bottom) in the reservoir from November 2002 to February 2004. A range of 18 environmental variables including temperature, electrical conductivity (EC), total phosphorus (TP) and total nitrogen (TN) were measured to assess their influence on phytoplankton community succession. As well, combined multivariate analyses with a cluster analysis and a nonmetric multidimensional scale (NMDS) were conducted. Microcystis aeruginosa was the dominant species in all seasons except spring. Thus, Cyanophyceae was a dominant taxonomic group. In spring, Bacillariophyceae dominated, followed by Cryptophyceae and Chlorophyceae. The succession was relatively delayed at the middle and bottom layers compared with at the surface layer. Abundance and species richness of phytoplankton were also higher in the surface layer than in the bottom layer. Cluster analysis classified the phytoplankton community into four clusters at each depth, and the changes were also well reflected in the NMDS ordination. Each cluster showed seasonal patterns characterized by indicator species, as well as environmental variables such as temperature, conductivity, and nutrients including N and P. Seasonal dynamics of the phytoplankton community was the strongest at the surface layer and weakest at the bottom layer. These depth-variable environmental variables are likely to be the key factors driving changes in the phytoplankton community composition.

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Multi-response permutation procedures for a priori classifications

Cited by 275 publications

References 5 publications

Distribution of benthic diatoms in Korean rivers and streams in relation to environmental variables

Distribution of benthic diatoms in Korean rivers and streams in relation to environmental variables

Long-term spatial stability of coyote (Canis latrans) home ranges in southeastern Colorado

Temporal changes of phytoplankton community at different depths of a shallow hypertrophic reservoir in relation to environmental variables

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