Recognizing cyanobacterial diversity through adoption of a new species paradigm

Johansen, Jeffrey R.; Casamatta, Dale A.

doi:10.1127/1864-1318/2005/0117-0071

Cited by 145 publications

(137 citation statements)

References 33 publications

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“…Most recently, Kim et al (2014) combined previously mentioned approaches and proposed 98.65 % similarity in 16S rRNA as a threshold for species delimitation. Unfortunately, these are all similarity based criteria, and not in line with modern systematics approaches which emphasize broader tools of reconstruction of evolutionary relationships (Castenholz and Norris 2005;Johansen and Casamatta 2005;Komárek 2010 and many others).…”

Section: Species Concept In (Cyano)bacteriamentioning

confidence: 99%

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

et al. 2015

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The cyanobacteria are the most important prokaryotic primary producers on Earth, inhabiting a great diversity of aquatic and terrestrial environments exposed to light. However, the evolutionary forces leading to their divergence and speciation remain largely enigmatic compared to macroorganisms due to their prokaryotic nature, including vast population sizes, and largely asexual reproduction. The advent of modern molecular techniques has facilitated an understanding of the important factors shaping cyanobacterial evolution, including horizontal gene transfer and homologous recombination. We review the forces shaping the evolution of cyanobacteria and discuss the role of cohesive forces on speciation. Further, while myriad species concepts and definitions are currently used, only a limited subset might be applied to cyanobacteria due to their asexual reproduction. Additionally, concepts based solely on phenotypes provide insufficient resolution. A monophyletic species concept which is universal may be ideal for cyanobacteria. Actual identification of the cyanobacteria is difficult due to cryptic diversity, lack of morphological variability, and frequent convergent evolutionary events. Thus, applied molecular techniques such as DNA barcoding will be useful for identifications of environmental samples. Lastly, we show that the real biodiversity of the cyanobacteria is widely underestimated, due in part to low sampling efforts, sensitivity to the molecular markers 123Biodivers Conserv (2015) 24:739-757 DOI 10.1007 employed, and the species definitions employed by researchers. In conclusion, we anticipate a rapid increase in cyanobacterial taxa described and large revisions of the system in the future as scientists adopt a common approach to cyanobacterial systematics.

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Section: Species Concept In (Cyano)bacteriamentioning

confidence: 99%

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

et al. 2015

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“…Furthermore, the 571 PTP-defined species represents 12.7-21.2% of the total described species under the ICN included in either AlgaeBase (Guiry & Guiry 2015;4484) or the CyanoDB (information from Nabout et al 2013; 2698 species), respectively. It should be noted that species under the ICN and ICNP are described using various species concepts, mostly phenetic with some form of a phylogenetic species concept, but a majority of recently published descriptions and revisions do not cite any particular species concept (for a review, see Johansen & Casamatta 2005). Species identified using the PTP are purely phylogenetic species as advocated by Nixon & Wheeler (1990).…”

Section: On the Incompatibility Of Molecular And Traditional Cyanobacmentioning

confidence: 99%

“…Since modern molecular methods are able to provide greater taxonomic resolution due to a bounty of additional data (e.g. Johansen & Casamatta 2005;Erwin & Thacker 2008), we consider the discrepancy between the number of phylogenetic species and number of described species to reflect that the total diversity is underestimated.…”

Section: On the Incompatibility Of Molecular And Traditional Cyanobacmentioning

confidence: 99%

“…Although cyanobacteria are an evolutionary and ecologically important group of organisms, significant gaps exist regarding their taxonomy and systematics. These problems are exacerbated due to difficulty of culturing, low sampling efforts outside the temperate zone, and problematic species concepts (for reviews see Castenholz 1992;Komárek 2003;Johansen & Casamatta 2005;Komárek et al 2014;Dvořák et al 2015a, b).…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that these quantifications are mostly based on traditional (and often flawed due to convergent evolution) morphological approaches using a phenetic species concept under the ICN. The introduction of molecular markers for unraveling the systematics of cyanobacteria has allowed researchers to use species concepts derived from evolutionary principles, such as the phylogenetic or monophyletic species concepts, which are increasingly being employed by cyanobacterial taxonomists (reviewed in Johansen & Casamatta 2005).…”

Section: Introductionmentioning

confidence: 99%

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Difference without distinction? Gaps in cyanobacterial systematics; when more is just too much

Dvořák¹,

Jahodářová²,

Casamatta³

et al. 2018

Fottea

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Cyanobacteria are amongst the most abundant, ubiquitous, ecologically and evolutionarily significant microbes on Earth. Unique among the Bacteria in their capacity to be identified using morphology, understanding the evolutionary relationships and describing the diversity of this lineage is both important and challenging. The advent of modern sequencing technology has proven a boon to those studying cyanobacterial systematics as it has provided copious amounts of sequence data (mainly of the 16S rRNA gene sequence). However, this influx of data has also led to taxonomic confusion and recognition of polyphyly in many genera. Thus, the purpose of this paper is to describe this apparent paradox of increasing data yet poor phylogenetic resolutions by employing the Poisson Tree Process (PTP) algorithm and to propose some ameliorative efforts.

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Modern classification of cyanobacteria

Komárek

2013

Cyanobacteria

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Recognizing cyanobacterial diversity through adoption of a new species paradigm

Cited by 145 publications

References 33 publications

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

Difference without distinction? Gaps in cyanobacterial systematics; when more is just too much

Modern classification of cyanobacteria

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