1,721,283 research outputs found
Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium
No full textAndré, Coralie, Sabbe, Koen, Vijver, Bart Van De (2023): Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium. Phytotaxa 591 (1): 83-86, DOI: 10.11646/phytotaxa.591.1.10, URL: http://dx.doi.org/10.1094/PDIS-04-22-0755-PD
Cymatosirella minutissima Dabek, Witkowski & Sabbe 2013, comb. nov.
No full textCymatosirella minutissima (Sabbe & Muylaert) Dąbek, Witkowski & Sabbe comb. nov. Basionym: Cymatosira minutissima Sabbe & Muylaert in Sabbe, K., Vanelslander, B., Ribeiro, L., Witkowski, A., Muylaert, K. & Vvyerman, W. (2010: 246, figs 17–20, 28, 31). For a detailed description of this species, see Sabbe et al. (2010).Published as part of Dąbek, Przemysław, Sabbe, Koen, Witkowski, Andrzej, Archibald, Colin, Kurzydłowski, Krzyszof J. & Zgłobicka, Izabela, 2013, Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae, pp. 42-56 in Phytotaxa 121 (1) on page 50, DOI: 10.11646/phytotaxa.121.1.2, http://zenodo.org/record/507946
FIGURES 1–35 in Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium
No full textFIGURES 1–35. Pseudostaurosira ellipticolanceolata André, Sabbe & Van de Vijver, sp. nov. LM and SEM pictures taken from the holotype material (BR-4776, Aardenburg sediment core, depth 85 cm, Belgium). 1–21. LM views of several specimens arranged in decreasing size. 22. SEM external view of an entire valve. 23. SEM view of two valves with interdigitating spines (white arrows). 24. SEM internal view of an entire valve, connected to another. 25. SEM external view of an entire valve. 26. SEM internal view of an entire valve. Note the raised virgae bordering the flat sternum. 27. SEM internal detail of the valve apex. The white arrow indicates the apical pore field. 28. SEM external detail of the valve apex. The white arrows indicate the eroded apical pore field. The black arrows indicate the presence of vestiges of the areola coverings. Scale bars = 10 µm (Figs 21, 22, 24, 26), 5 µm (Figs 23, 25, 27), 1 µm (Fig. 28).Published as part of André, Coralie, Sabbe, Koen & Vijver, Bart Van De, 2023, Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium, pp. 83-86 in Phytotaxa 591 (1) on page 84, DOI: 10.11646/phytotaxa.591.1.10, http://zenodo.org/record/778413
FIGURES 23–43 in Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae
No full textFIGURES 23–43: Cymatosirella benguelensis Dąbek & Witkowski sp. nov., Lamberts Bay, South Africa. All images originate from the holotype slide SZCZ 17497. Figs 23–33: LM images. Scale bar = 10 µm. Figs 32, 33: Living cells with plastids. Figs 34–39, 41, 42: SEM images. Figs 40, 43: TEM images. Figs 34–36: Frustule in girdle view with complete cingulum. Bands with one row of poroids (arrowhead). Fig. 37: External view of valve. Note the simple occlusions closing areolae and spines on the valve face. Figs 38, 39: Internal view of the valve and ocelluli. Fig. 40: Valve with occlusions (arrowhead) and spines (arrow). Fig. 41: Ocellulus composed of 13 porelli (3 central porelli). Figs. 42, 43: Central, bulged part of the valve face surrounded by one row of poroids and spines. Fig. 43: Detail of valve showing occlusions (arrowhead) and spines (arrow).Published as part of Dąbek, Przemysław, Sabbe, Koen, Witkowski, Andrzej, Archibald, Colin, Kurzydłowski, Krzyszof J. & Zgłobicka, Izabela, 2013, Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae, pp. 42-56 in Phytotaxa 121 (1) on page 48, DOI: 10.11646/phytotaxa.121.1.2, http://zenodo.org/record/507946
Diversity and dynamics of protist communities in subtidal North Sea sediments in relation to metal pollution and algal bloom deposition
No full textThe Belgian Coastal Zone (BCZ) is heavily polluted by trace metals, that pose a potential threat to the marine ecosystem in the area, including to humans (a.o. via fisheries). Trace metals accumulate in silty, organically enriched sediments and changes in the environment can lead to the resuspension of the metals, with the activity of the benthic microbes as one potential factor influencing the release of TM into the water column. Benthic microbial activity and dynamics in turn are regulated by the availability of growth substrates, and sedimentation of phytoplankton blooms represents a major source of organic material for the benthic biota in subtidal areas. It remains unclear however, how microbial communities, phytodetritus deposition and TM behaviour interact in subtidal sediments. We aimed to obtain a better insight in the interactions between microbial communities, metal contaminants and algae-derived organic matter in contaminated sediments of the BCZ. Our study focussed on protist (unicellular eukaryotes) communities, which are largely understudied but ecologically very important since they occupy a central position in the benthic food webs, especially in the microbial loop. Both field studies and microcosm experiments were performed, and molecular fingerprinting techniques (18S rDNA and rRNA- based DGGE and clone libraries) were used to characterise protistan diversity and dynamics in the contaminated sediments. A high diversity was found, with members ecologically important as primary producers (mainly diatoms), grazers (Rhizaria, Alveolata, Amoebozoa, heterotrophic stramenopiles), saprobes (Fungi) or pathogen/parasites (e.g. Marine Alveolates Group I, Pirsonia sp.). Our results showed that phytoplankton deposition after the spring algal bloom stimulates microbial activity and activates the development of the microbial loop, and a positive link is suggested between this increased microbial activity and the observed increased mobilisation and upward metal fluxes. Moreover, we found indications that the diversity and structure of the protistan communities in these sediments are affected by the trace metals, as evidenced by both the field and experimental data
Taxonomy, diversity and ecology of freshwater diatom communities (Bacillariophyta) from moss habitats of Gough Island (southern Atlantic Ocean)
No full textThe present study shows the results of a taxonomic and ecological survey on moss- inhabiting diatoms from Gough Island (40ř21' S, 9ř53' W). An analysis of more than 100 samples resulted in 141 identified diatom taxa, of which 21 were described by Carter (1966) and have not been reported elsewhere. Illustrative analyses of diatom communities from Tristan da Cunha and Inaccessible islands revealed an additional nine taxa, but an otherwise highly similar flora. The observed flora was highly disharmonic in its composition, represented by only a few diatom genera (i.e. Eunotia, Pinnularia, Psammothidium and Chamaepinnularia), a feature typical for oceanic islands. Also, few diatom species dominating the flora were unique to the Tristan da Cunha archipelago (Gough Island in particular) and possibly endemic, or cosmopolitan in distribution. Diatom taxa being typical for sub-Antarctic islands haven't been observed in larger amount. This, together with the highly specific diatom flora of Gough Island, resulted in very low similarity values between Gough and the other islands of southern ocean. The closest to the Tristan da Cunha archipelago based on its flora was identified to be Ile Amsterdam from the south Indian Ocean, implying the influence of west-wind drift. To investigate the diatom flora..
Long-term trends in phytoplankton biomass, composition and dynamics in the Belgian part of the North Sea
Full text linkDiversity and occurrence of free-living protozoa on food and in food-related environments
Full text link
- …
