Revision of the Coccoid Myxophyceae: Additions and Corrections

Drouet, Francis; Daily, William A.

doi:10.2307/3223637

Cited by 50 publications

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“…Relative proportions of each taxon of centrics and pennates were then multiplied by the respective Utermöhl counts. Primary taxonomic references included Prescott (1962), Kramer andLange-Bertalot (1991, 1997), Patrick andReimer (1966, 1975), Germain (1981), Huber-Pestalozzi (1941, 1968, 1983, and Drouet and Daily (1972). At least 10 individuals of each taxon were measured per sample and cell volumes computed using geometric formulae that most closely approximate their shape.…”

Section: Laboratory Methodsmentioning

confidence: 99%

The Deep Chlorophyll Maximum in Lake Superior

Barbiero

Tuchman

2004

Journal of Great Lakes Research

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Section: Laboratory Methodsmentioning

confidence: 99%

The Deep Chlorophyll Maximum in Lake Superior

Barbiero

Tuchman

2004

Journal of Great Lakes Research

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“…Numerous species have been described using only morphological characters. However, their wide variability was recognised, which resulted in the tendency of some authors to classify different similar types into large taxonomic units at specific and generic levels (Drouet and Daily 1956;Drouet 1968Drouet , 1973Drouet , 1977. Nevertheless, this "Drouet's concept" is not consistent with the variation and ecology of cyanobacteria in natural biotopes, and has been definitely discredited by modern molecular investigations.…”

Section: Species Conceptsmentioning

confidence: 99%

Cyanobacterial Taxonomy: Current Problems and Prospects for the Integration of Traditional and Molecular Approaches

Komárek¹

2006

ALGAE

145

115

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Cyanobacteria (Cyanophytes, Cyanoprokaryotes) are among the most fascinating organisms in the Earth's biosphere. Their origin in the Early Precambrian was one of the most important steps in evolution (Schopf 1974a(Schopf , 1974b(Schopf , 1993(Schopf , 1996. They are prokaryotic bacteria, however, their cells developed the plant-type photosynthetic apparatus that included chlorophyl a and both photosystems. The subsequent evolution of the plant kingdom is based on numerous intracellular symbioses of prokaryotic cyanobacteria with eukaryotic heterotrophs. The relative ease with which cyanobacteria enter into symbioses is a characteristic of this lineage (cf., e.g., reviews of Janson 2002; Carpenter and Foster 2002, and others). Other remarkable adaptations developed in cyanobacteria enabled them to colonize variable and extreme habitats in Earth ecosystems (Carr and Whitton 1973;Fogg et al. 1973; Whitton and Potts 2000; Rai and Gaur 2001). Cyanobacteria are the only oxyphototrophic organisms to contain Nif-genes, and mechanisms and adaptations for fixation of gaseous nitrogen. They participate in the formation of travertine and stromatolites, and a substantial part of limestone deposits over the Earth results from their metabolic activity. Several types are adapted to colonise hypersaline locations, hot springs up to over 70°C, or to enormous oscillations of temperatures and periodical drying in both cold and hot deserts. They are able to produce toxins, which can function in competitive interactions in various ecosystems. Most noteworthy is the extraordinary vitality of this special bacterial group which has not declined during its existence that has spanned billions of years.The massive developments of cyanobacterial populations have also become important because of increasing eutrophication of the biosphere. Thus there is major concern regarding "water blooms" in freshwaters of all continents, unexpected developments of cyanobacterial types in plankton and littoral zones of seas and oceans (e.g., picoplanktic Prochlorococcus, or periphytic Lyngbya majuscula), and cyanobacterial crusts in semideserts (Leptolyngbya, Microcoleus, Nostoc). From a scientific perspective the most challenging questions revolve around evolutionary strategies, the survival and diversification of cyanobacteria over the long period of their existence, and evaluation of their present diversity in nature (cf. The application of modern ecological, ultrastructural and molecular methods, aided by the cultivation of numerous cyanobacterial morphotypes, has substantially changed our knowledge of these organisms. It has led to major advances in cyanobacterial taxonomy and criteria for their phylogenetic classification. Molecular data provide basic criteria for cyanobacterial taxonomy; however, a correct phylogenetic system cannot be constructed without combining genetic data with knowledge from the previous 150 years research of cyanobacterial diversity. Thus, studies of morphological variation in nature, and modern morphological, ultrastructural...

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“…Specimens were documented via drawings and microphotographs. Types and synonymies were traced according to data in Drouet & Daily (1956).…”

Section: Materials and Microscopymentioning

confidence: 99%

Phylogenetic and taxonomic delimitation of the cyanobacterial genusAphanotheceand description ofAnathece gen. nov.

Komárek

Kaštovský

Jezberová

2011

European Journal of Phycology

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The traditional cyanobacterial form-genus Aphanothece was established according to morphological criteria in the middle of the 19th century by Na¨geli. It comprises unicellular morphotypes with oval or cylindrical cells arranged irregularly in amorphous mucilaginous colonies. Up to now, more than 80 morphospecies have been described, mostly from various freshwater aquatic habitats. The genus Aphanothece is heterogeneous in the traditional morphological concept as well as according to modern molecular criteria. Therefore, it must be divided into several taxonomic clusters. Generic characteristics, studied by a combination of molecular sequencing of 16S rDNA, ultrastructure, ecology and morphological variation, were investigated in selected strains and populations of type species of the traditional subgenera Aphanothece and Anathece. Distinct differences were found between both of these clusters in their position in the phylogenetic tree, ultrastructure of cells, morphology (size of cells), mucilage structure, life cycles and ecology. They must therefore be separated into two genera, according to both bacteriological and botanical criteria, and placed in different orders (Chroococcales and Synechococcales). Accordingly we describe Anathece, gen. et stat. nov., and transfer to it the type A. clathrata comb. nov. and six other species. Several other morphotypes, originally classified in the genus Aphanothece (but morphologically different from Aphanothece sensu stricto), correspond to the genera Cyanoaggregatum, Cyanogastrum, Gloeobacter, Gloeothece and Halothece. The closest relative of Anathece appears to be Cyanobium.

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Revision of the Coccoid Myxophyceae: Additions and Corrections

Cited by 50 publications

References 0 publications

The Deep Chlorophyll Maximum in Lake Superior

The Deep Chlorophyll Maximum in Lake Superior

Cyanobacterial Taxonomy: Current Problems and Prospects for the Integration of Traditional and Molecular Approaches

Phylogenetic and taxonomic delimitation of the cyanobacterial genusAphanotheceand description ofAnathece gen. nov.

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