scholarly journals Uncommon species diversity values in epiphytic diatom assemblages of the kelp Eisenia arborea

2016 ◽  
Vol 26 (1) ◽  
pp. 61-76 ◽  
Author(s):  
David Alfaro Siqueiros Beltrones ◽  
Keyword(s):  
Species Diversity ◽  
Diatom Assemblages ◽  
Eisenia Arborea

Diatoms in the Early Valdai (Weichselian) sediments in Lake Ladoga basin

2019 ◽  
pp. 225-228
Author(s):  
Anna V. Ludikova
Keyword(s):  
Species Diversity ◽  
High Energy ◽  
Lake Ladoga ◽  
Diatom Assemblages ◽  
Marine Diatoms ◽  
Selective Preservation

The pioneer diatom study of the Early Weichselian (Valdai) sediments in Lake Ladoga basin was performed. The specifics of the diatom assemblages (co-occurrence of ecologically incompatible taxa, poor species diversity, low diatom concentration and selective preservation) suggest that during the Early Weichselian time intense erosion of previously deposited marine Eemian (Mikulino) sediments prevailed, which resulted in re-deposition of marine diatoms. The sedimentation took place in high-energy environments unfavorable for diatom accumulation and preservation.

scholarly journals The diversity of diatom assemblages developed on fallow soil in Pogórska Wola near Tarnów (southern Poland)

2015 ◽  
Vol 68 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Jadwiga Stanek-Tarkowska ◽  
Teresa Noga ◽  
Natalia Kochman-Kędziora ◽  
Łukasz Peszek ◽  
Anita Pajączek ◽  
...  
Keyword(s):  
Species Diversity ◽  
Dominant Species ◽  
Wiener Index ◽  
Elevated Concentration ◽  
Fallow Land ◽  
Loose Sand ◽  
Diatom Assemblages ◽  
Neutral Species ◽  
Southern Poland ◽  
Fallow Soil

The aim of this work was to investigate the species diversity of diatoms growing on fallow fields on loose sand. The study site was located in the western part of Pogórska Wola near Tarnów (southern Poland). Samples were collected from fallow land once a month from April to December 2011. 57 diatom taxa from 19 different genera were found. The most numerous genera were <em>Fragilaria</em> (8) and <em>Luticola</em> (7). The highest species richness was observed in December, November and July, while the highest values of species diversity (Shannon–Wiener index) were recorded between August and October. Four taxa – <em>Pinnularia borealis</em> Ehrenb. var. <em>borealis</em>, <em>Stauroneis borrichii</em> (Petersen) Lund, <em>Hantzschia amphioxys</em> (Ehrenb.) Grunow, and <em>Luticola nivalis</em> (Ehrenb.) D.G. Mann, were found to be the dominant species. Neutral species (a pH of about 7) dominated in all months (from April to December), reaching an over 90% share in the assemblage. In terms of nitrogen content, nitrogen-autotrophic taxa, tolerating an elevated concentration of organically bound nitrogen, occurred most abundantly, as was indicated by the low content of nitrogen in the soil.

scholarly journals A First Estimate of Species Diversity for Benthic Diatom Assemblages from the Revillagigedo Archipelago, Mexico

Diversity ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 458
Author(s):  
David A. Siqueiros Beltrones ◽  
Francisco Omar López-Fuerte ◽  
Yuriko Jocselin Martínez ◽  
María del Carmen Altamirano-Cerecedo
Keyword(s):  
Species Diversity ◽  
Pacific Coast ◽  
New Records ◽  
Benthic Diatom ◽  
Marine Diatom ◽  
Diatom Assemblages ◽  
Species List ◽  
Mexican Pacific ◽  
Epiphytic Diatoms ◽  
Revillagigedo Archipelago

Recent investigations at previously unexplored localities on the Mexican coast have confirmed the high taxonomic potential of benthic marine diatom assemblages (BMDA) in the region. An exploratory study of epiphytic diatoms of macroalgae in the Revillagigedo Archipelago (RA) suggested that further studies would yield many more taxa, prompting the hypothesis that diversity measurements, based on ecological indices, would be among the highest in pristine environments. Thus, the aim of this research was to enrich the record of epiphytic diatom floristics of the RA, and to estimate species diversity based on information theory (H′). Floristically, 167 identified taxa are added here to the BMDA species list of the RA, bringing the total to 397 taxa overall, including 52 taxa that are potentially new records for the Mexican Pacific coast. Among the most conspicuous genera are Mastogloia with five new taxa and it remains the most diverse genus with 55 taxa overall, followed by Cocconeis (27), Nitzschia (24), Amphora (23), Navicula (19), Diploneis (17) and Grammatophora (15). As expected for a pristine environment, the computed species diversity values for the BMDA were high, ranging from H′ = 3.92–5.2, depicting stability. Future surveys are expected to further increase the species richness of BMDA for the RA.

Holocene diatom assemblages from Dunderbukhta sediments, West Svalbard

2019 ◽  
pp. 242-245
Author(s):  
Ksenya V. Poleshchuk ◽  
Zinaida V. Pushina ◽  
Sergey R. Verkulich
Keyword(s):  
Environmental Changes ◽  
Ecological Groups ◽  
Diatom Assemblages ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
Sediment Samples ◽  
Ecological Zones ◽  
Middle Holocene ◽  
Temperature Trends

The diatom analysis results of sediment samples from Dunderbukta area (Wedel Jarlsberg Land, West Svalbard) are presented in this paper. The diatom flora consists of four ecological groups, which ratio indicates three ecological zones. These zones show environmental changes of the area in early–middle Holocene that is demonstrating periods of regression and temperature trends.

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