Incorporation of zinc into the frustule of the freshwater diatom Stephanodiscus hantzschii

Much recent attention has been focused on vegetative survival forms of planktonic diatoms and other algae. There are several reports of extended vegetative survival of the freshwater diatom Melosira in lake sediments. In contrast to those diatoms which form a morphologically distinct resistant spore, Melosira is known to produce physiological resting cells that are indistinguishable in outward morphology from actively growing cells.We used both light and electron microscopy to document and elucidate the sequence of cytological changes during the transition from resting cells to actively growing cells in a population of Melosira granulata from Douglas Lake, Michigan sediments collected in mid-July of 1983.

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Microbial biogeography through the lens of exotic species: the recent introduction and spread of the freshwater diatom Discostella asterocostata in the United States

Biological Invasions ◽

10.1007/s10530-021-02497-5 ◽

2021 ◽

Author(s):

Andrew J. Alverson ◽

Tyler K. Chafin ◽

Kiley A. Jones ◽

Kalina M. Manoylov ◽

Hillary Johnson ◽

...

Keyword(s):

United States ◽

Exotic Species ◽

The United States ◽

Microbial Biogeography ◽

Recent Introduction ◽

Freshwater Diatom

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Cyclotella deceusteriana, a new centric diatom species (Bacillariophyta) from the sub-Antarctic Region

Phytotaxa ◽

10.11646/phytotaxa.333.1.8 ◽

2018 ◽

Vol 333 (1) ◽

pp. 108 ◽

Cited By ~ 1

Author(s):

BART VAN DE VIJVER ◽

STEVEN DESSEIN

Keyword(s):

New Species ◽

Morphological Analysis ◽

Central Area ◽

Centric Diatom ◽

New Taxon ◽

Antarctic Region ◽

Distribution And Ecology ◽

Electron Microscopical ◽

A New Species ◽

Freshwater Diatom

During a survey of the freshwater diatom flora of the sub-Antarctic region (Iles Kerguelen and Iles Crozet) in the southern Indian Ocean, an unknown Cyclotella taxon was observed that was formerly identified as the presumed cosmopolitan C. meneghinana. Detailed morphological analysis based on light and scanning electron microscopical observations and comparison with several similar Cyclotella taxa worldwide justified the description of this unknown taxon as a new species: Cyclotella deceusteriana sp. nov. The new taxon is characterized by the presence of marginal fultoportulae on every costa, hyaline furrows between the raised marginal parts on which the striae are located, 2, occasionally 1, 3 or 4 central fultoportulae and an entirely flat, smooth, relatively small central area. The new species is described and compared with other Cyclotella taxa. Notes on its distribution and ecology are added.

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Inorganic carbon uptake in a freshwater diatom, Asterionella formosa (Bacillariophyceae): from ecology to genomics

Phycologia ◽

10.1080/00318884.2021.1916297 ◽

2021 ◽

pp. 1-12

Author(s):

Stephen C. Maberly ◽

Brigitte Gontero ◽

Carine Puppo ◽

Adrien Villain ◽

Ilenia Severi ◽

...

Keyword(s):

Inorganic Carbon ◽

Carbon Uptake ◽

Asterionella Formosa ◽

Inorganic Carbon Uptake ◽

Freshwater Diatom

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Encyonema oblonga (Bacillariophyta, Cymbellaceae), a new species from Shanxi Province, China

Phytotaxa ◽

10.11646/phytotaxa.480.3.8 ◽

2021 ◽

Vol 480 (3) ◽

pp. 284-290

Author(s):

QI LIU ◽

JIAJIA LI ◽

QUANXI WANG ◽

JOHN PATRICK KOCIOLEK Patrick Kociolek ◽

Shulian Xie

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

New Species ◽

Shanxi Province ◽

Diatom Flora ◽

A New Species ◽

Scanning Electron ◽

Freshwater Diatom

A new species, Encyonema oblonga Liu & Xie, is collected during a survey of the freshwater diatom flora of Manghe River, Shanxi, China. The valves of this new species are oblong with rounded apices and have the features typical of Encyonema, including complex areolae. We compare the new species with the most similar taxa, E. leei, E. leei var. sinensis and E. appalachianum and consider that E. leei var. sinensis is the valid name. The morphology of E. oblonga is documented with light and scanning electron microscopy.

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Freshwater diatom transfer to clothing: Spatial and temporal influences on trace evidence in forensic reconstructions

Science & Justice ◽

10.1016/j.scijus.2018.11.004 ◽

2019 ◽

Vol 59 (3) ◽

pp. 292-305 ◽

Cited By ~ 3

Author(s):

K.R. Scott ◽

R.M. Morgan ◽

N.G. Cameron ◽

V.J. Jones

Keyword(s):

Trace Evidence ◽

Freshwater Diatom

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Pinnularia subcatenaborealis sp. nov. (Bacillariophyta) a new chain-forming diatom species from King George Island (Maritime Antarctica)

Phytotaxa ◽

10.11646/phytotaxa.364.3.5 ◽

2018 ◽

Vol 364 (3) ◽

pp. 259 ◽

Cited By ~ 2

Author(s):

NATALIA KOCHMAN-KĘDZIORA ◽

EVELINE PINSEEL ◽

MATEUSZ RYBAK ◽

TERESA NOGA ◽

MARIA OLECH ◽

...

Keyword(s):

Morphological Characteristics ◽

New Taxon ◽

King George Island ◽

Maritime Antarctica ◽

Glacier Forefield ◽

Valve Size ◽

James Ross Island ◽

Small Pool ◽

A New Species ◽

Freshwater Diatom

During a survey conducted on the freshwater diatom flora of small shallow pools on the Ecology Glacier forefield (King George Island, Maritime Antarctic Region), an unknown spine-bearing chain-forming Pinnularia species, belonging to the Pinnularia borealis species complex, was found. Although it closely resembles the recently described Pinnularia catenaborealis from James Ross Island and Vega Island (Antarctic Peninsula), a unique set of morphological characteristics revealed in both light and scanning electron microscopy clearly discriminates the specimens of King George Island as a new species. Pinnularia subcatenaborealis Kochman-Kędziora, Pinseel & Van de Vijver sp. nov. can be distinguished from P. catenaborealis by an overall smaller valve size, the presence of irregularly formed silica outgrowths on the mantle and small, irregular plates located near the apices. The new taxon is so far only recorded from a small pool with circumneutral pH and very low conductivity.

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The structure and diversity of freshwater diatom assemblages from Franz Josef Land Archipelago: a northern outpost for freshwater diatoms

PeerJ ◽

10.7717/peerj.1705 ◽

2016 ◽

Vol 4 ◽

pp. e1705 ◽

Cited By ~ 5

Author(s):

Sergi Pla-Rabés ◽

Paul B. Hamilton ◽

Enric Ballesteros ◽

Maria Gavrilo ◽

Alan M. Friedlander ◽

...

Keyword(s):

Seasonal Changes ◽

Ph Gradient ◽

Diatom Assemblages ◽

Diatom Flora ◽

Human Footprint ◽

Franz Josef Land ◽

Freshwater Diatoms ◽

Arctic Conditions ◽

Cell Densities ◽

Freshwater Diatom

We examined diatom assemblages from 18 stream and pond samples in the Franz Josef Land Archipelago (FJL), the most northern land of Eurasia. More than 216 taxa were observed, revealing a rich circumpolar diatom flora, including many undescribed taxa. Widely distributed taxa were the most abundant by cell densities, while circumpolar taxa were the most species rich. Stream and pond habitats hosted different assemblages, and varied along a pH gradient.Diatoma tenuiswas the most abundant and ubiquitous taxon. However, several circumpolar taxa such asChamaepinnularia gandrupii, Cymbella botellus, Psammothidiumsp. andHumidophila laevissimawere also found in relatively high abundances. Aerophilic taxa were an important component of FJL diatom assemblages (Humidophilaspp.,Caloneisspp. andPinnulariaspp.), reflecting the large and extreme seasonal changes in Arctic conditions. We predict a decrease in the abundance of circumpolar taxa, an increase in local (α-) freshwater diatom diversity, but a decrease in regional diversity (circumpolar homogenization) as a result of current warming trends and to a lesser extent the increasing human footprint in the region.

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