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Combining taxon-by-trait and taxon-by-site matrices for analysing trait patterns of macroinvertebrate communities : a rejoinder to Monaghan & Soares (2014)
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2670526
Author(s) Schmera, D; Podani, J; Eros, T; Heino, J
Author(s) at UniBasel Schmera, Dénes
Year 2014
Title Combining taxon-by-trait and taxon-by-site matrices for analysing trait patterns of macroinvertebrate communities : a rejoinder to Monaghan & Soares (2014)
Journal Freshwater biology
Volume 59
Pages / Article-Number 1551-1557
Abstract

Monaghan and Soares (2014) suggested that combining traits with log-transformed abundance of taxa may cause anomalies in analyses of stream macroinvertebrate communities. While they addressed an important issue in stream ecology, here we present an opposite view. To identify the causes of these contrasting opinions, we carefully examined the examples provided by Monaghan and Soares (2014) and demonstrated how traits can be weighted by the presence, abundance and log-transformed abundance of the taxa in a meaningful way. We found that Monaghan and Soares (2014), following other authors, use the term weighting' differently from classical papers of stream ecology. The general practice is to calculate the sum of trait values multiplied by the abundance of each taxon and divide it by the total invertebrate abundance to get a community-level trait value. In contrast, Monaghan and Soares (2014) did not perform the final division and consequently did not get a standardised community-level trait value. It follows that the term weighting' is used with different meanings in stream ecology, and ecologists should keep these differences in mind. We agree with Monaghan and Soares (2014) that the addition of log-transformed data is equivalent to multiplication on an arithmetic scale. However, we disagree that this provides an inconsistent scaling that confounds quantitative analyses. Using example data sets, we illustrate how trait-based data analysis can be performed in community ecology in a meaningful way.

Publisher Blackwell
ISSN/ISBN 0046-5070
edoc-URL http://edoc.unibas.ch/dok/A6288982
Full Text on edoc No
Digital Object Identifier DOI 10.1111/fwb.12369
ISI-Number WOS:000337528600017
Document type (ISI) Article
 
   

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