Explaining the cover image for issue 2.6

A lichen crust community

Cover image for issue 2.6

The cover image for the last issue of the year of Methods in Ecology and Evolution is a biological soil crust (BSC), a community which may be composed by mosses, lichens, liveworths fungi and bacteria that are prevalent in drylands worldwide.

Lichen-dominated BSCs (like the one in the image) affect multiple ecosystem functions in those habitats where they are present, including carbon and nitrogen cycling, soil stabilization, and water infiltration and runoff.

The article linked to the image is Randomization tests for quantifying species importance to ecosystem function by Nicholas Gotelli, Werner Ulrich and Fernando Maestre. In the article the authors introduce randomization tests for evaluating the effect of individual species on ecosystem variables measured in multiple plots. This approach is tested using data on ecosystem functioning in lichen-dominated BSC assemblages from central Spain, and further validated using an independent microcosm experiment. The method proposed in this article provides a simple index and statistical test of species importance that can form the basis for additional hypothesis tests and experimental studies of species occurrence and ecosystem functioning.

This BSC-forming lichen community was photographed by Fernando T. Maestre in gypsum outcrops from Sax (South East Spain).


Issue 2.6

Our last issue for 2011 is out. Issue 2.6 is packed with the latest methodological developments.

We have four new articles on monitoring: from positional accuracy in the field by Mike Dodd to distance sampling butterflies by Nick Isaac and colleagues, to how to account for non-independent detection of individuals by Julien Martin and collaborators and, finally, to a class of spatial capture-recapture models for ‘search-encounter’ data by Andrew Royle, Marc Kéry and Jérôme Guélat.

Two articles focus on modelling distributions. Darryl MacKenzie and colleagues present their work on modelling habitat and species distribution dynamics and Peter Wilson introduces an analytical framework applying a distance-based approach to the ordination and analysis of maps produced by species distribution modelling tools.

Kristen L. Granger and collaborators explain their extraction and assay methods on seed chemistry while Adam Davis et al look at seed predation rates.

Also, Joseph Chipperfield et al model dispersal kernels, Alexandre Bec and co-authors assess the reliability of fatty acid–specific stable isotope analysis for trophic studies. Jeroen Groot and Walter Rossing review recent developments in systems modelling which support learning by creating a salient diversity of management alternatives and by translating science-based results into stakeholder perspectives.

Nicholas J. Gotelli, Werner Ulrich and Fernando T. Maestre explore randomization tests for quantifying species importance to ecosystem function and their article takes the front cover.

Finally, the issue contains two free Application articles. In the first Conrad Stack, Luke Harmon and Brian O’Meara detail RBrownie, an R package for testing hypotheses about rates of evolutionary change. In the second, Stefan Prost and Christian Anderson present TempNet, a method to display statistical parsimony networks for heterochronous DNA sequence data.

Ask your librarian to get free access in perpetuity to the first two years of Methods in Ecology and Evolution by completing this request form or learn about how to access the journal in 2012.