Coccoid Cyanobacteria

Komárek, Jiří; Johansen, Jeffrey R.

doi:10.1016/b978-0-12-385876-4.00003-7

Cited by 25 publications

(17 citation statements)

References 175 publications

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“…This category includes solitary cells of cyanobacteria and eukaryotic algae in the 0.2–2 μ m size range or slightly larger (c. 5 μ m). Coccoid cyanobacteria include those in the genera Cyanobium , Cyanothece , Synechococcus , and Synechocystis (Stockner et al 2000; Komárek and Johansen 2015). Not included here are the many cyanobacteria with coccoid cells in colonies that contain 4–12 and up to 40–50 cells, and that range in size from <12 to 400 μ m (Stockner 1991; Stockner et al 2000).…”

Section: Types Of Food Availablementioning

confidence: 99%

Food niches of planktonic rotifers: Diversification and implications

Gilbert

2022

Limnology & Oceanography

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The diverse diets of common planktonic rotifers are described in detail from field and laboratory observations and experiments. Also considered are methodological approaches, rotifer feeding mechanisms, and the availability in natural waters of less well-known food items (detritus, picoplankton, protozoans). Despite much variation among and within rotifer genera, food niches of planktonic rotifers can be subdivided into four broad, overlapping categories defined by the predominant types and sizes of food ingested: (1) microphagous rotifers that eat fine detritus/organic aggregates, picoplankton, and 2-10 μm nanoplankton; (2) polyphagous rotifers that eat the above items, larger nanoplankton, and small (20-50 μm) microplankton; (3) macrophagous algivores that eat 5-50 μm algae; and (4) macrophagous omnivores/predators that eat 5-250 μm algae, protozoans, and metazoans. These diet-based categories have ecological advantages over categories based on rotifer morphology or feeding mode. The information on diets assembled here is important for understanding: (1) the population dynamics of planktonic rotifers and their food organisms; (2) the position of rotifers in classical and microbial food webs;(3) the seasonality, spatial distribution, and species diversity of rotifers in plankton communities; and (4) food overlap, and thus potential resource competition, among planktonic protozoans, rotifers, and crustaceans.

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Section: Types Of Food Availablementioning

confidence: 99%

Food niches of planktonic rotifers: Diversification and implications

Gilbert

2022

Limnology & Oceanography

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“…However, a question arises: how many different genetic, morphological and probably functional identities are included in this taxon? Morphological plasticity in cyanobacteria has been recognized for a long time, making taxonomic classification difficult, especially in coccoid cyanobacteria, which have simpler and less diacritical characteristics (Komárek and Johansen, 2015). Pointing (2016) pointed out that species names have yet to be agreed upon for many taxa within this genus.…”

Section: Discussionmentioning

confidence: 99%

Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life

Mehda

Muñoz-Martín

Oustani

et al. 2021

Environmental Microbiology

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The hyperarid Sahara Desert presents extreme and persistent dry conditions with a limited number of hours during which the moisture availability, temperature and light allow phototrophic growth. Some cyanobacteria can live in these hostile conditions by seeking refuge under (hypolithic) or inside (endolithic) rocks, by colonizing porous spaces (cryptoendoliths) or fissures in stones (chasmoendoliths). Chroococcidiopsis spp. have been reported as the dominant or even the only phototrophs in these hot desert lithic communities. However, the results of this study reveal the high diversity of and variability in cyanobacteria among the sampled habitats in the Sahara Desert. The chasmoendolithic samples presented high coccoid cyanobacteria abundances, although the dominant cyanobacteria were distinct among different locations. A high predominance of a newly described cyanobacterium, Pseudoacaryochloris sahariense, was found in hard, compact, and more opaque stones with cryptoendolithic colonization. On the other hand, the hypolithic samples were dominated by filamentous, non-heterocystous cyanobacteria. Thermophysiological bioassays confirmed desiccation and extreme temperature tolerance as drivers in the cyanobacterial community composition of these lithic niches. The results of the present study provide key factors for understanding life strategies under polyextreme environmental conditions. The isolated strains, especially the newly described cyanobacterium P. sahariense, might represent suitable microorganisms in astrobiology studies aimed at investigating the limits of life.

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“…The keys derive from the specific literature survey on the taxonomy of cyanobacteria [11][12][13][14][15][16][17][18][19], green algae [11,13] and diatoms [11,13,21] and from the authors' collected material. The keys are dichotomous.…”

Section: Identification Keysmentioning

confidence: 99%

“…An easy to use guide containing identification keys for the main phototrophs growing on monumental fountains and other wet stone surfaces is presented in this work. These new keys resulted after revising and simplifying other different identification keys [11][12][13][14][15][16][17][18][19][20][21] and they were tailored as a new tool for professionals in the field of stone conservation, that are interested in making their first steps in phototrophs identification. It is based on both macroscopic and microscopic characteristics for the main genera belonging to cyanobacteria, green algae and diatoms, the main three phototrophic groups found on the ornamental fountains.…”

Section: Introductionmentioning

confidence: 99%

Facing Phototrophic Microorganisms That Colonize Artistic Fountains and Other Wet Stone Surfaces: Identification Keys

et al. 2021

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All fountains are inhabited by phototrophic microorganisms, especially if they are functional and located outdoors. This fact, along with the regular presence of water and the intrinsic bioreceptivity of stone material, easily favors the biological development. Many of these organisms are responsible for the biodeterioration phenomena and recognizing them could help to define the best strategies for the conservation and maintenance of monumental fountains. The presence of biological growth involves different activities for the conservation of artistic fountains. This paper is a review of the phototrophic biodiversity reported in 46 fountains and gives a whole vision on coping with biodeteriogens of fountains, being an elementary guide for professionals in the field of stone conservation. It is focused on recognizing the main phototrophs by using simplified dichotomous keys for cyanobacteria, green algae and diatoms. Some basic issues related to the handling of the samples and with the control of these types of microalgae are also briefly described, in order to assist interested professionals when dealing with the biodiversity of monumental fountains.

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Coccoid Cyanobacteria

Cited by 25 publications

References 175 publications

Food niches of planktonic rotifers: Diversification and implications

Food niches of planktonic rotifers: Diversification and implications

Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life

Facing Phototrophic Microorganisms That Colonize Artistic Fountains and Other Wet Stone Surfaces: Identification Keys

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