Asterionella formosa. Asterionella fibula (Breb., 1849) Hustedt, 1952 Species: Asterionella formosa Hass. Living cells are joined in colonies, linked valve face to valve face, at the footpole by mucilage pads. (1856) 2003), 20-25% in lakes of the Beartooth Mountains (Saros et al. Körner (1970) considers A. gracillima to be synonymous with A. formosa. PMID 24355202. Sarah Spaulding, Mark Edlund - Jan 2009 Reviewer. order Fragilariales family Fragilariaceae genus ... Asterionella formosa Name Synonyms Asterionella gracillima var. Valves are elongate, narrow, with capitate apices. They are frequently found in star-shaped colonies of individuals. Explanation of each environmental variable and units are as follows: ELEVATION = stream reach elevation (meters) log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU). were most abundant in summer. Transmission electron micrographs further show porefields at … 1990). SLOPE = stream reach gradient (degrees) [4] Asterionella have no means of locomotion. Order Fragilarialesᵀ P.C. 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. Change History. … log_NA = log concentration of sodium (µeq/L) log_HCO3 = log concentration of the bicarbonate ion (µeq/L) acaroides (Lemmermann) Cleve-Euler, 1953 Asterionella gracillima var. The silica skeleton of a diatom cell (called the frustule) consists of an epitheca and an hypotheca. Therefore one daughter cell is always smaller than the original cell. 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. Variety: Asterionella formosa var. We herein discuss five cultures of parasitic chytrids on diatoms Aulacoseira spp. John E. Brittain, ... Lars-Evan Pettersson, in Rivers of Europe, 2009. [ About COPEPEDIA] 1990). The Northern Dvina phytoplankton is typical of lowland rivers (Bryzgalo et al. During four months in culture the valve length of five isolates decreased. The sinking rates of colonies of a laboratory strain of Asterionella formosa were measured over a 5-year period, during which time mean cell length and cell volume reduced by almost an order of magnitude and the typical, stellate arrangement of eight-celled colonies was eventually lost. DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance. 2005, Saros et al. doi:10.3955/046.088.0306. Mekhalfi, Malika; Amara, Sawsan; Robert, Sylvie (June 2014). In Windermere, and some other lakes in the English Lake District, the vernal increase of Asterionella formosa ceases when the concentration of silica in the water falls to approximately 0.5 mg/l. Common names 福爾摩沙星杆藻 in language. Patrick and Reimer (1966) report maximum valve length of 130 µm in US specimens. Variety: Asterionella formosa var. Valves are distinctly heteropolar. Asterionella is a genus of pennate freshwater diatoms. 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. Order: Fragilariales Silva Family: Fragilariaceae Greville Genus: Asterionella Hassall Species: Asterionella formosa Hass. Note that the relative abundance scale is the same on each plot. 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. The cells in the colony are attached by the apex by extracellular matter. acaroides Lemm. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a new hypotheca. Asterionella formosa is a common diatom in the plankton of lakes and slow moving rivers. 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. Irregular marginal spines may, or may not, be present. [Order] Tabellariales [Family] Tabellariaceae [Genus] Asterionella: Records associated with the species formosa: #V87R4 2. A. japonica Contributor. were dominant in autumn, spring and early summer, and Scenedesmus sp., Coelastrum sp. Responses of the planktonic diatom Asterionella formosa Hassall to abiotic environmental factors in a reservoir complex (south-eastern France). Retrieved January 15, 2021, from https://diatoms.org/species/asterionella_formosa. Taxonomy - Asterionella formosa (SPECIES) ))) Map to UniProtKB (177) Unreviewed (177) TrEMBL. A. formosa is infected by three well-described chytrid species, Rhizophydium planktonicum Canter emend., Zygorhizidium planktonicum Canter, and Zygorhizidium affluens Canter. log_COND = log concentration of specific conductivity (µS/cm) ... Asterionella formosa. This is called a hypersensitive reaction. A single rimoportula is present at the footpole (larger apex). doi:10.1016/j.biochi.2013.12.004. EMBED = percent of the stream substrate that is embedded by sand and fine sediment For short-term K for silicate-limiled oyowlh of C. meneghiniana is less than that of A. Iormosa. Visit #25 (February 18th, 2018) at Hostigates Lochs (South) View Photo Species Profile. A. formosa characterized by elongated valves with wide poles. "Observations of a Diatom Chytrid Parasite in the Lower Columbia River". Marginal spines may, or may not be present. Biochimie. The striae are uniseriate and somewhat irregularly spaced. PHSTVL = pH measured in a sealed syringe sample (pH units) A. gracillima The average size of an Asterionella colony is between 60 and 80 micrometers long, with each arm being 2-4 micrometers wide. Terminal (leaf) node. 2015). Maier, Michelle A.; Peterson, Tawnya D. (Oct 2014). Hydrobiologia. This increase is interpreted as a response to atmospheric nutrient enrichment. Lake Maarsseveen (52.142828 N, 5.085711 E, The Netherlands) is a dimictic, Hoh Lake, in western Washington, increased to more than 20% A. formosa in response to an estimated summer bulk deposition load of 1.0± 0.3 kg N ha-1 yr-1 (Sheibley et al. Northwest Science. 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. 101: 21–30. Fragilariaceae. Asterionella is a genus of a diatom. A single rimoportula is present at the footpole. A. formosa is almost an order of -ma onilll(le more cf- firien/ at internal PhosPhalc for o.row/h. log_DOC = log concentration of dissolved organic carbon (mg/L) This increase has been interpreted as a response to atmospheric nutrient enrichment (Saros et al. 9.7.3 Biodiversity. Asterionella formosa is known to be susceptible to the chytrid fungus Zygorhizidium planktonicum. In naming species, a heterotypic synonym is one that comes into being when a taxon becomes part of a different taxon. Copyright © 2021 Diatoms of North America, Search taxa, citations, glossary, contributors, and images. Format. A. kariana. Type Species Asterionella formosa Hass. Correlation and multiple regression analyses revealed associations between plankton and chemical variables. Asterionella formosa is a common diatom in the plankton of lakes and slow moving rivers. The source for diatom identification and ecology. 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. … Asterionella formosa Name Synonyms Asterionella formosa f. acaroides (Lemmermann) Skabichevskii, 1960 Asterionella gracillima var. A difference in type. 2014). Cell Size: Length (apical axis) 30-150um Distribution: Found in nutrient-rich temperate lakes; is a major contributor to spring blooms. Phylum : Chrysophyta Kelas : Bacillariophceae Ordo : Pennales ... Order : Cyclopoida Family : Cyclopoidae Genus : Cyclops Spesies : Cyclops sp. Although A. formosa is common in mesotrophic and eutrophic lakes globally, it has been increasing in presence and abundance in oligotrophic alpine lakes. Mnemonic i-Taxon identifier i: 210441: Scientific name i: Asterionella formosa: Taxonomy navigation › Asterionella. Klasifikasi Asterionella formosa; Gambar Klasifikasi ciri-ciri habitat Asterionella formosa. Information on the nutrient kinetics of Asterionella formosa Hass. Fragilariales. 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. 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. A rimoportula may be present at either pole, at both poles, or even more than one rimoportula at a pole (Körner 1969, Round et al. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a new hypotheca. Taxonomy - Asterionella (GENUS) ))) Map to UniProtKB (188) Unreviewed (188) TrEMBL. 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. Transmission electron micrographs further show porefields at both apices (Körner 1969). The morphology of Asterionella formosa isolated from two contrasting lakes has been studied. log_SIO2 = log concentration of silicon (mg/L) Asterionella average cell size is 60–85 micrometers long and 2–4 micrometers wide. Mnemonic i-Taxon identifier i: 35129: Scientific name i: Asterionella: Taxonomy navigation › Fragilariaceae. A. bleakeleyi These web pages are currently under construction and expansion. 88 (3): 234–245. formosa (Hassall) Wislouch, 1921 Homonyms Asterionella formosa Hass. Format. It forms colonies that often consist of eight cells, but can vary up to 20 cells. A number of varieties are treated in the same reference by Körner. The striae are slightly off-set from one another at the central sternum. Asterionella formosa lives in colonies, joined by mucilage pads. Asterionella formosa var. Many diatoms in low nutrient lakes respond with population increases even with relatively low loads of reactive nitrogen. 2010). By the way the cells are attached to each other, the colonies often look like stars or spiralling chains. A. formosa Columnar incubators 4 m in height, held at 4 C, with a light gradient of 250 10 m mol photons m -2 sec -1 were used to simulate vertical mixing as found in Lake Michigan. Family. Diatoms respond, even to relatively low loads of anthropogenic reactive nitrogen, in low nutrient lakes. A. glacialis Studies of the seasonality of A. formosa date to the classic works of Lund (1950) in Windemere. The striae are slightly off-set from one another at the central sternum. 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