During four months in culture the valve length of five isolates decreased. 2010). Greater variation in valve length was observed in the strain from Llyn Coron, resulting in the separation of two morphologically distinct clones from the original isolate. doi:10.3955/046.088.0306. By the way the cells are attached to each other, the colonies often look like stars or spiralling chains. 2003), 20-25% in lakes of the Beartooth Mountains (Saros et al. log_HCO3 = log concentration of the bicarbonate ion (µeq/L) In North America, populations of A. formosa, along with Fragilaria crotonensis Kitton, have been shown to increase greatly with increases of reactive nitrogen (Nr) in oligotrophic alpine lakes of the Rocky Mountains. 2002), mainly consisting of diatoms and green algae, with Asterionella and Aulacoseira being dominant, and Cyclotella and Stephanodiscus occurring in some areas.In warm periods, Anabaena increases in number. Asterionella formosa. Asterionella formosa. In order to regain their original size, it is usually assumed diatoms have to reproduce sexually, although this has not yet been observed in A. formosa. Many diatoms in low nutrient lakes respond with population increases even with relatively low loads of reactive nitrogen. A clone of the diatom Asterionella formosa was studied to determine the ability of the species to photoacclimate as they were passed through a light gradient at varying rates. Valves are long and narrow, with capitate apices. −1 in a medium containing Si: P in various concentration ratios. The central sternum is very narrow and may not be distinguishable. However, there may also be other ways to rejuvenate.[1]. The cells in the colony are attached by the apex by extracellular matter. We herein discuss five cultures of parasitic chytrids on diatoms Aulacoseira spp. Asterionella formosa is known to be susceptible to the chytrid fungus Zygorhizidium planktonicum. formosa (Hassall) Wislouch, 1921 Homonyms Asterionella formosa Hass. Mekhalfi, Malika; Amara, Sawsan; Robert, Sylvie (June 2014). A single rimoportula is present at the footpole. Summary. Heiberg (1863) Asterionella notata Grunow, in Van Heurck Asterionella ralfsii W. Sm. North American Diatom Ecological Database. The morphology of Asterionella formosa isolated from two contrasting lakes has been studied. Family. In lakes, the freshwater diatom Asterionella formosa Hassall is one of the principal bloom-forming diatom species that are inedible to zooplankton (13, 25) and is known to be susceptible to chytrid parasitism (9, 26).formosa A. is infected by three well-described chytrid species, Rhizophydium planktonicum Canter emend., Zygorhizidium PMID 24355202. In naming species, a heterotypic synonym is one that comes into being when a taxon becomes part of a different taxon. log_SIO2 = log concentration of silicon (mg/L) Seven Asterionella formosa genotypes were isolated from a single water sample taken with a 5L Uwitec water sampler during an Asterionella spring bloom in January 2008 at 5m depth in Lake Maarsseveen. Algae Details UTEX Number: FD381 Class: Bacillariophyceae Strain: Asterionella formosa Medium: Ag Diatom Medium (Ag) Origin: Iowa, USA Description of Location: GPS: Type Culture: No Collection: D. Czarnecki Isolation: D. Czarnecki (11/18/96) Isolator Number: L1460 Deposition: D. Czarnecki (4/5/06) Relatives: Also Known As: Notes: A. formosa is almost an order of -ma onilll(le more cf- firien/ at internal PhosPhalc for o.row/h. under either phosphate or silicate limitation was obtained for use in a Monod model and in a variable internal stores model of growth. The central sternum is very narrow and may not be distinguishable. were dominant in autumn, spring and early summer, and Scenedesmus sp., Coelastrum sp. Asterionella formosa. … The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Asterionella formosa from all the stream reaches where it was present. In order to assess the patterns of distribution of plankton species in relation to acidity, water chemistry, and physical characteristics, twenty lakes in Nova Scotia were selected for examination, with pH ranging from 3.5 to 7.6. Studies of the seasonality of A. formosa date to the classic works of Lund (1950) in Windemere. Direct Children: Variety: Asterionella formosa var. For short-term K for silicate-limiled oyowlh of C. meneghiniana is less than that of A. Iormosa. The striae are slightly off-set from one another at the central sternum. 1990). The striae are uniseriate and somewhat irregularly spaced. Although A. formosa is common in mesotrophic and eutrophic lakes globally, it has been increasing in presence and abundance in oligotrophic alpine lakes. Note that the relative abundance scale is the same on each plot. A number of varieties are treated in the same reference by Körner. Asterionella is a genus of pennate freshwater diatoms. They are often found in colonies of eight or more in the shape of a star, which is how they got their name. In particular, A. formosa has been used as a marker of “critical loads”, defined as the threshold of the nitrogen deposition rate above which there is a discernible ecological effect (Porter and Johnson 2007). It is most likely a combination of gravity and currents that distribute the organism. The kQ of A. formosa compared to C. meneghiniana found in long‐term semicontinuous culture indicates that A. formosa is almost an order of magnitude more efficient at using internal phosphate for growth. Change History. #V24R11 1. acaroides (Lemmermann) Meister, 1912 Homonyms Asterionella formosa var. The elongate shape of the frustules and the spiral colonies are resistant to sinking in their planktonic habitat. A. gracillima 2010) and to a lesser extent in shallow lakes of the Tetons (Spaulding et al. A. glacialis Körner (1970) considers A. gracillima to be synonymous with A. formosa. Taxonomy - Asterionella (GENUS) ))) Map to UniProtKB (188) Unreviewed (188) TrEMBL. These web pages are currently under construction and expansion. log_NO3 = log concentration of nitrate (µeq/L) PHSTVL = pH measured in a sealed syringe sample (pH units) and Cyclotella meneghiniana Kutz. Order. Retrieved January 15, 2021, from https://diatoms.org/species/asterionella_formosa. acaroides synonym: UKSI Classification unranked Biota kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Fragilariales family Fragilariaceae genus Asterionella species Asterionella formosa variety Asterionella formosa var. Asterionella formosa is a common diatom in the plankton of lakes and slow moving rivers. A. formosa characterized by elongated valves with wide poles. (1833) Genus Asterionella Hassall (1850) Asterionella formosa Hassall (1850) Asterionella gracillima (Hantzsch.) Therefore one daughter cell is always smaller than the original cell. Mnemonic i-Taxon identifier i: 210441: Scientific name i: Asterionella formosa: Taxonomy navigation › Asterionella. Asterionella formosa was most common in winter, while centric diatoms such as A. granulata, Cyclotella sp., Skeletonema potamos and Stephanodiscus sp. Spaulding, S. (2012). acaroides (Lemmermann) Cleve-Euler, 1953 Asterionella gracillima var. (1856) They are frequently found in star-shaped colonies of individuals. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a new hypotheca. 101: 21–30. Asterionella japonica Cleve 1882 Close. acaroides Lemm. Order: Fragilariales Silva Family: Fragilariaceae Greville Genus: Asterionella Hassall Species: Asterionella formosa Hass. The cell quotas of P and Si changed in relation to the available concentrations of P and Si at constant μ= 0.11 and 0.16 d −1. Order Fragilarialesᵀ P.C. [ About COPEPEDIA] 2014). As a model, we brought into stable laboratory culture a pairing between the bloom-forming diatom Asterionella formosa and a pathogenic chytrid identified as Rhizophydium planktonicum, isolated from Pavin Lake, France. Contributor. A single rimoportula is present at the footpole (larger apex). Species: Asterionella gracilis Species: Asterionella gracillima (Hantzsch) Heib. ... Asterionella formosa. Patrick and Reimer (1966) report maximum valve length of 130 µm in US specimens. Asterionella formosa is common in mesotrophic and eutrophic lakes globally and is one of the most common planktonic diatoms in these lakes in the northern hemisphere. Asterionella formosa var. The hypotheca is slightly smaller than the epitheca. Hydrobiologia. Common names 福爾摩沙星杆藻 in language. Asterionella fibula (Breb., 1849) Hustedt, 1952 Species: Asterionella formosa Hass. EMBED = percent of the stream substrate that is embedded by sand and fine sediment Algae Details UTEX Number: FD480 Class: Bacillariophyceae Strain: Asterionella formosa Medium: Ag Diatom Medium (Ag) Origin: Description of Location: GPS: Type Culture: No Collection: Isolation: D. Czarnecki (5/16/04) Isolator Number: L1880 Deposition: D. … The spines may also be irregularly spaced. 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