Nitzschia gobbii sp. nov. (Bacillariophyceae): a common but overlooked planktonic diatom species from the northwestern Adriatic Sea

Phycologia ◽  
2021 ◽  
pp. 1-14
Author(s):  
Sonia Giulietti ◽  
Cecilia Totti ◽  
Tiziana Romagnoli ◽  
Melania Siracusa ◽  
Simone Bacchiocchi ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Diatom Species ◽  
Planktonic Diatom

Entomoneis tenera sp. nov., a new marine planktonic diatom (Entomoneidaceae, Bacillariophyta) from the Adriatic Sea

Phytotaxa ◽  
2017 ◽  
Vol 292 (1) ◽  
pp. 1 ◽  
Author(s):  
MAJA MEJDANDŽIĆ ◽  
SUNČICA BOSAK ◽  
SANDI ORLIĆ ◽  
MARIJA GLIGORA UDOVIČ ◽  
PETRA PEHAREC ŠTEFANIĆ ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Phylogenetic Analyses ◽  
Morphological Characteristics ◽  
The Other ◽  
Small Cells ◽  
Molecular Analyses ◽  
Clear Separation ◽  
Planktonic Diatom ◽  
Taxonomic Affiliation ◽  
Apical Axis

The genus Entomoneis Ehrenberg includes diatoms with structurally complex frustules having a bilobate keel elevated above the valve surface and numerous girdle bands. We describe here a new member of the genus, Entomoneis tenera sp. nov., a minute species found in the plankton of the south-eastern Adriatic Sea. The description and proposed taxonomic affiliation are based on both morphological observations and molecular analyses obtained from three cultivated strains. The cultures were established from plankton net samples taken during BIOTA (Bio-tracing Adriatic Water Masses) cruise conducted in February–March 2015. In addition to characteristic Entomoneis features such as panduriform cells, often twisted around the apical axis and a raphe with simple endings positioned on the sigmoid keel, morphological characteristics of E. tenera are: (1) very small cells, 16–21 μm long and 5–20 μm wide (2) very lightly silicified, delicate frustules without valve striation discernible in light microscopy, (3) broad lanceolate valves with scalpeliform apices (4) a straight to slightly arcuate junction line. Phylogenetic analyses using SSU, rbcL and psbC supported the position of E. tenera within the Entomoneis genus with a clear separation from the other described species.

scholarly journals Diatoms and bacteria diversity: study of their relationships in the Southern Adriatic Sea

2003 ◽  
Vol 4 (2) ◽  
pp. 73 ◽  
Author(s):  
C. CAROPPO ◽  
L. STABILI ◽  
R.A. CAVALLO
Keyword(s):  
Annual Cycle ◽  
Adriatic Sea ◽  
Heterotrophic Bacteria ◽  
Gram Negative Bacteria ◽  
Diatom Species ◽  
Gram Negative ◽  
Culturable Heterotrophic Bacteria ◽  
Italian Coasts ◽  
Diversity Study ◽  
Phytoplankton Group

In the Southern Adriatic Sea (Italian coasts) bacterial and diatom diversity was studied over an annual cycle and the relationships between these two microbial components were analyzed. As regards the culturable heterotrophic bacteria, Aeromonas was the predominant genus among the Gram-negative bacteria. The presence of Enterobacteriaceae, Cytophaga, Pseudomonas, Acinetobacterand Photobacteriumwas also remarkable. Flexibacter, Moraxella, Chromobacterium, Flavobacteriumand Vibriowere present at less than 5%. Of the 92 diatom species determined, 16 were the most abundant representing the 96% of this phytoplankton group. The results obtained demonstrated that several bacterial genera were significantly related to the most abundant and representative diatoms ( Chaetocerosspp., Pseudo-nitzschia pseudodelicatissimaand Rhizosoleniaspp.).

A Study of the Diatoms of the Ouse Estuary, Sussex III. The Seasonal Variation in the Littoral Epiphyte Flora and the Shore Plankton

1964 ◽  
Vol 44 (3) ◽  
pp. 613-644 ◽  
Author(s):  
J. T. Hopkins
Keyword(s):  
Littoral Zone ◽  
Sea Water ◽  
Limiting Factors ◽  
Diatom Species ◽  
Growth Phases ◽  
Lethal Temperatures ◽  
Planktonic Diatom ◽  
Coastal Sea ◽  
Temperature Records ◽  
The Relationship

SUMMARYAnalyses have been made of some of the constituents of the coastal sea water and the river water, and the results have been correlated with the growth phases of some planktonic diatom species and littoral epiphytes, although for most species the sea-water temperature and light intensity were limiting factors.The factor determining the death of an epiphytic diatom community in the littoral zone has been considered to be the air temperature in conjunction with desiccation and a summary of the limiting temperatures for each of the four substrata is given in Table 7. Table 10 is a summary of all the distribution and temperature records. The heat itself is not lethal in many cases but the desiccation of the epiphyte in the littoral zone is accelerated at higher temperatures. Diatoms in damp situations were found to occur at temperatures which in a dry site were limiting, and further work indicating the relationship between relative humidity and lethal temperatures is needed.The ability of a diatom to survive depends upon the water-retaining ability of the substratum. Chalk and large algae favoured the growth of most solitary epiphytes, and filamentous epiphytes grew particularly well on algae except the filamentous Navicula, which were best suited by chalk. The Achnanthes blue-green community was most frequent on wood. Concrete makes a firm substratum and allows rapid growth in winter but it is easily dried and most diatoms on it are destroyed in the summer.Four diatom genera (Fragilaria, Grammatophora, Biddulphia and Melosira) are able to exist in the epiphyte flora and the shore plankton and the term facultative epiphyte is suggested to describe the behaviour of at least some of the species of these genera.

The planktonic diatom genus Chaetoceros Ehrenberg (Bacillariophyta) from the Adriatic Sea

Phytotaxa ◽  
2017 ◽  
Vol 314 (1) ◽  
pp. 1 ◽  
Author(s):  
SUNČICA BOSAK ◽  
DIANA SARNO
Keyword(s):  
Adriatic Sea ◽  
Light And Electron Microscopy ◽  
Single Species ◽  
Distinct Species ◽  
Morphological Comparison ◽  
Distinctive Features ◽  
Planktonic Diatom ◽  
Field Samples ◽  
Diatom Genus ◽  
Species Specific

The morphology of the genus Chaetoceros, one of the most abundant and diverse planktonic diatom groups, was investigated using material collected in the eastern Adriatic Sea from 2006 to 2012. Twenty-seven morphologically distinct species have been identified from both field samples and cultivated strains. Two species, C. bacteriastroides and C. pseudodichaeta, are reported for the first time for the area. Morphometric data, general morphology and ultrastructural characters are presented for each species, based on light and electron microscopy observations, with a special emphasis on species-specific distinctive features. Valve ultrastructure appeared to be characteristic for single species or group of closely related species, especially inside the subgenus Hyalochaete. A collection of appropriate micrographs will facilitate future identification of Chaetoceros species and morphological comparison with material from other geographic areas.

Discostella oyanensis, sp. nov., a new planktonic diatom species from Nigeria, West Africa

2017 ◽  
Vol 32 (2) ◽  
pp. 163-173 ◽  
Author(s):  
Taofikat Abosede Adesalu ◽  
Matthew L. Julius
Keyword(s):  
West Africa ◽  
Diatom Species ◽  
Planktonic Diatom
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