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Book Review: Diatoms from the Antarctic Region

by Anh Tu (Lina) Van* |

Iconographia Diatomologica, annotated diatom monographs, Volume 24, Diatoms from the Antarctic Region: Maritime Antarctica. 2012. By Ralitsa Zidarova, Katerina Kopalova & Bart Van de Vijver. Edited by Horst Lange-Bertalot. 216 plates and 1 appendix, 504 pages. Koeltz Scientific books. 180€ (prices in other currencies depend on current course).  ISBN: 978-3-946583-05-9

Detailed book review:

Antarctica remains in many ways a scientific frontier – its vast and unforgiving landscape belies the biological diversity present there. Within the transient freshwater and wet terrestrial habitats, diatoms manage to survive. In the last two decades, major strides have been made in describing the flora and fauna present in Antarctica. This book describes the nearly decade-long effort.

Like the other Iconographia Diatomologica books, this book is not meant to be read through. Rather, it is mostly a reference for newly described freshwater and terrestrial diatom taxa of several Antarctic islands, specifically of the South Shetland Islands and James Ross Island. The vast majority of these taxa were established by the authors themselves.

The book is well-organized, if a bit unintuitive for perusal, as the taxa are listed according to the systematic classification of Round et al. (1990), and then alphabetically within each genus. However, there is an alphabetic taxa listing to supplement this this. Indices and references are very well crosslinked. Printing on glossy paper has helped the photographs to be smooth and almost grain-free.

Species descriptions are consistent and formulaic, making it easy to search for specific characters during diagnostic work. Excellent quality LM and SEM photos accompany the descriptions; scale bars are included on every page. Of most value might be the comparison with morphologically similar taxa, but the differences are more clearly described for some taxa than others. There are several well-known and cosmopolitan taxa described, but interestingly, many of the species seem to be rare or seldom-observed. Due to sampling methods, there was an unusual and welcome focus on diatoms found in terrestrial habitats.

There are only two minor flaws with the book. First, the type localities of novel taxa are not listed. Rather, the locality descriptions are ecologically-based, e.g., “mostly in wet seepage areas with or without moss vegetation cover and on mosses (p.162)”. While the permanent slides and stubs, and presumably the metadata, are available at the Botanical Garden Meise (Belgium), an easier oversight would have been better.

Second, the book lacks any molecular support for the taxa described. Diatom research is becoming increasingly reliant on bioinformatics and systematics to resolve taxonomic problems, one of which is species delimitation. Arguably, the establishment of new taxa would fall into this category. The introduction has a brief section on taxonomic revision, so it is surprising to see no mention of a phylogeny of the individual taxa.

Nevertheless, it may well be only a minor flaw in the context of the book’s original concept. Even obtaining environmental DNA metabarcoding data would have been a major task, possibly beyond the scope of what the authors and their collaborators were feasibly able to do. And because the book is not posited as a phylogenetic analysis of diatoms in Antarctica, its main function would be the description of novel morphological forms of species of diatoms.

This is not to say that Volume 24 is an insignificant contribution to diatom studies. The sheer morphological diversity presented here, even for the limited genera presented, can be seen as a starting point for future biodiversity research. And although it is not an identification key per se, its focus on rare taxa, often found in transient habitats, makes it a valuable work. It will serve as an excellent reference guide for those working in the Antarctic region.

*Anh Tu (Lina) Van
Universität Rostock
Angewandte Ökologie & Phykologie
Albert-Einstein-Straße 3
18059 Rostock
Germany

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