Eberto Novelo; Rosaluz Tavera; Claudia Ibarra:

Bacillariophyceae from Karstic Wetlands in Mexico

Dedicated to Dr. Arturo Gómez-Pompa

2007. 136 pages, 3 figures, 21 plates, 14x23cm, 290 g
Language: English

(Bibliotheca Diatomologica, Band 54)

ISBN 978-3-443-57045-3, paperback, price: 49.00 €

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Bacillariophyceae karstic wetland Mexico diatom flora El Eden Ecological Reserve


Synopsis top ↑

This publication describes the diatom flora of freshwater environments from karstic wetlands from El Eden Ecological Reserve, Mexico. Environmental parameters and latitude are found to influence the diatom flora significantly. Encountered species and their distribution are documented. Of the 156 taxa identified in this location, 29 have a tropical distribution, 76 are considered alkaliphilous. As a result of this study three new combinations and 9 new taxa are described.

Review: Acta Botanica Hungarica 51. 2009 top ↑

This volume presents the diatom flora of freshwater environments in karstic wetlands (cenotes, ponds, inundated savannah) from El Edén Ecological Reserve, Mexico. 151 samples collected from metaphyton, periphyton and phytoplankton were examined by the authors. The aim of the study was not only to create the species list of the area, but to answer the question if the species composition is influenced by the special geographical, environmental and ecological features of the area.

Accordingly, an ecological characterisation of species - based on bibliographic information of their distribution, pH preference and salinity tolerance - is presented in the book.

It is mentioned by the authors, that in case of some species designated as "cosmopolitan" in the literature (e.g. species described from alpine lakes and from shallow water bodles at low altitudes as well), there may be morphological differences between populations living in different circumstances. Sometimes these differences are left hidden in the descriptions which make determination more difficult.

156 taxa occurred in El Edén Ecological Reserve, 29 of them have a tropical distribution, 76 are registered as alkalophilous species and 64 have an affinity to calcareous substrata. According to the results of the presented investigation, latitudinal situation and environmental features of the Reserve influence significantly the composition of diatom flora, which has little similarity with other floras for tropical America, such as those from Brazil, Venezuela or Guyana, where most of the species are acidophilous. The most abundant species were: Cymbopleura chacii sp. nov., Brachysira microcephala (Grunow) Compére, Encyonema mesianum (Cholnoky) Mann, E. gracile Ehrenberg, E. mexicanum Krammer and Mastogloiai smithii Thwaites ex W. Smith.

Species and their distributions are described in the part "Descriptions of the taxa from El Edén Ecological Reserve". Descriptions of the species are alphabetically organised according to the system of Krammer and Lange-Bertalot, with some of the modifications proposed by Round et al. for supraspecific taxa.

As a result of the study, 9 new taxa are described and 3 new combinations are proposed: Aulacoseira periphytica sp. nov., Caloneis subanicola sp. nov., Capartogramma paradisiaca sp. nov., Cymbopleura cachii sp. nov., Encyonema densistriata sp. nov., Fragilaria dzonoticola sp. nov., Nitzschia yalahau sp. nov., Pinnularia mayarum sp. nov., Stauroneis amphibia sp. nov., Achnantidium chlinados (Hohn et Hellermann) comb. nov., Cymbopleura hustedtii (Krasske) comb. nov., Placoneis porifera var. oportuna (Hustedt) comb. nov.

Unfortunately, descriptions of new species are based on LM observations only, since the authors found it unambiguous that populations in their samples clearly differ from other similar species. Hence, only LM micrographs of the new taxa are found on the 26 figure plates that follows the descriptional part. According to the methodological part of the book, the authors have had the possibility to use a scanning electron microscope; therefore it would have been very useful to examine these species with the SEM as well, in order to have more exact information about the morphology of new species, and to take SEM micrographs to illustrate them.

The volume has a logical structure, and it is nicely edited. It is worth reading for everyone deals with diatom taxonomy or distribution and for other researchers of the fields as well.

B. Bolla

Acta Botanica Hungarica 51.2009

Contents top ↑

Abstract / Resumen 4
Introduction 5
Study Area 6
Methods 7
Diatoms from El Edén Ecological Reserve 8
Acknowledgements 12
Descriptions of the taxa from El Edén Ecological Reserve 13
Centrales 13
Pennales 17
Fragilariaceae 17
Eunotiaceae 26
Achnanthaceae 26
Naviculaceae 32
Bacillariaceae 77
Epithemiaceae 77
Surirellaceae 80
References 82
Plates 89
Names index 132