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. Maier, Michelle A.; Peterson, Tawnya D. (Oct 2014). 2003), 20-25% in lakes of the Beartooth Mountains (Saros et al. Explanation of each environmental variable and units are as follows: ELEVATION = stream reach elevation (meters) A. japonica 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. A. formosa characterized by elongated valves with wide poles. order Fragilariales family Fragilariaceae genus ... Asterionella formosa Name Synonyms Asterionella gracillima var. Klasifikasi Phylum : Chlorophyta Kelas : Chlorophyceae Ordo : Zygnematales Genus : Gonatozygon Spesies : Gonatozygon monotaenium Ciri-ciri : memiliki klorofil,bentuk batang 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). A. gracillima Species: Asterionella gracilis Species: Asterionella gracillima (Hantzsch) Heib. ... Asterionella formosa. In SEM, the spines can be seen to be positioned between the striae. Change History. 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. SLOPE = stream reach gradient (degrees) Taxonomy - Asterionella formosa (SPECIES) ))) Map to UniProtKB (177) Unreviewed (177) TrEMBL. Valves are distinctly heteropolar, or may have asymmetric margins, variable within a population. The hypotheca is slightly smaller than the epitheca. log_DOC = log concentration of dissolved organic carbon (mg/L) Visit #25 (February 18th, 2018) at Hostigates Lochs (South) View Photo Species Profile. This increase is interpreted as a response to atmospheric nutrient enrichment. log_PTL = log concentration of total phosphorus (µg/L) #V24R11 1. 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. Although A. formosa is common in mesotrophic and eutrophic lakes globally, it has been increasing in presence and abundance in oligotrophic alpine lakes. doi:10.1016/j.biochi.2013.12.004. log_NO3 = log concentration of nitrate (µeq/L) Hydrobiologia. Correlation and multiple regression analyses revealed associations between plankton and chemical variables. The hypotheca is slightly smaller than the epitheca. Asterionella sp. The central sternum is very narrow and may not be distinguishable. formosa (Hassall) Wislouch, 1921 Homonyms Asterionella formosa Hass. 88 (3): 234–245. The spines may also be irregularly spaced. "Observations of a Diatom Chytrid Parasite in the Lower Columbia River". Heiberg (1863) Asterionella notata Grunow, in Van Heurck Asterionella ralfsii W. Sm. Cell Size: Length (apical axis) 30-150um Distribution: Found in nutrient-rich temperate lakes; is a major contributor to spring blooms. They are often found in colonies of eight or more in the shape of a star, which is how they got their name. [ About COPEPEDIA] In particular, A. formosa has been a marker of "critical loads", defined as the threshold of nitrogen deposition rate below which there is no discernible ecological effect (Porter and Johnson 2007). Terminal (leaf) node. were most abundant in summer. Asterionella formosa. The silica skeleton of a diatom cell (called the frustule) consists of an epitheca and an hypotheca. acaroides (Lemmermann) Cleve-Euler, 1953 Asterionella gracillima var. Marginal spines may, or may not be present. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a new hypotheca. Order. Spaulding, S. (2012). Format. and Pediastrum sp. 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. Direct Children: Variety: Asterionella formosa var. [2][3] If a chytrid attaches to an Asterionella cell, they can, however, protect others of their kind by committing apoptosis, or cellular suicide, stopping the spread of the parasite. It is most likely a combination of gravity and currents that distribute the organism. A. bleakeleyi −1 in a medium containing Si: P in various concentration ratios. 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. 2015). log_NA = log concentration of sodium (µeq/L) Asterionella formosa is known to be susceptible to the chytrid fungus Zygorhizidium planktonicum. EMBED = percent of the stream substrate that is embedded by sand and fine sediment These web pages are currently under construction and expansion. Mnemonic i-Taxon identifier i: 35129: Scientific name i: Asterionella: Taxonomy navigation › Fragilariaceae. Irregular marginal spines may, or may not, be present. Variety: Asterionella formosa var. Asterionella fibula (Breb., 1849) Hustedt, 1952 Species: Asterionella formosa Hass. Ciri-ciri : – Panjang tubuh sekitar 0,7-1,5 mm 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. 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. The silicate-limilino' conditions a Iso between the 2 methods. Phylum : Chrysophyta Kelas : Bacillariophceae Ordo : Pennales ... Order : Cyclopoida Family : Cyclopoidae Genus : Cyclops Spesies : Cyclops sp. Diatoms respond, even to relatively low loads of anthropogenic reactive nitrogen, in low nutrient lakes. For short-term K for silicate-limiled oyowlh of C. meneghiniana is less than that of A. Iormosa. Körner (1970) considers A. gracillima to be synonymous with A. formosa. In naming species, a heterotypic synonym is one that comes into being when a taxon becomes part of a different taxon. Asterionella average cell size is 60–85 micrometers long and 2–4 micrometers wide. 2010) and to a lesser extent in shallow lakes of the Tetons (Spaulding et al. Copyright © 2021 Diatoms of North America, Search taxa, citations, glossary, contributors, and images. By the way the cells are attached to each other, the colonies often look like stars or spiralling chains. Northwest Science. Studies of the seasonality of A. formosa date to the classic works of Lund (1950) in Windemere. and Cyclotella meneghiniana Kutz. Therefore one daughter cell is always smaller than the original cell. Order: Fragilariaceae Superfamily: Fragilariaceae Family: Asterionella Genus: Asterionella glacialis Species: ... Asterionella glacialis: COPEPEDIA is an in-development project. Living cells are joined in colonies, linked valve face to valve face, at the footpole by mucilage pads. Asterionella formosa is a common diatom in the plankton of lakes and slow moving rivers. The silica skeleton of a diatom cell (called the frustule) consists of an epitheca and an hypotheca. A. formosa is infected by three well-described chytrid species, Rhizophydium planktonicum Canter emend., Zygorhizidium planktonicum Canter, and Zygorhizidium affluens Canter. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a new hypotheca. log_HCO3 = log concentration of the bicarbonate ion (µeq/L) Mnemonic i-Taxon identifier i: 210441: Scientific name i: Asterionella formosa: Taxonomy navigation › Asterionella. Devlen Dykeman. Asterionella formosa. Common names 福爾摩沙星杆藻 in language. A. glacialis (1856) Klasifikasi Asterionella formosa; Gambar Klasifikasi ciri-ciri habitat Asterionella formosa. However, there may also be other ways to rejuvenate.[1]. Asterionella formosa. (1833) Genus Asterionella Hassall (1850) Asterionella formosa Hassall (1850) Asterionella gracillima (Hantzsch.) 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. … Retrieved January 15, 2021, from https://diatoms.org/species/asterionella_formosa. Valves are elongate, narrow, with capitate apices. Heterotypic. A difference in type. 9.7.3 Biodiversity. 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 lives in colonies, joined by mucilage pads. W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance. acaroides Lemm. Responses of the planktonic diatom Asterionella formosa Hassall to abiotic environmental factors in a reservoir complex (south-eastern France). 1990). Asterionella is a genus of pennate freshwater diatoms. The central sternum is very narrow and may not be distinguishable. The morphology of Asterionella formosa isolated from two contrasting lakes has been studied. "Effect of environmental conditions on various enzyme activities and triacylglycerol contents in cultures of the freshwater diatom, Asterionella forrnosa (Bacillariophyceae)". 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. Compare to homotypic. For example, relative abundance of A. formosa in Rocky Mountain National Park lake sediments approaches 60% in some lakes (Wolfe et al. Silva (1962) [monotypic] Family Fragilariaceaeᵀ Grev. Asterionella formosa is a common diatom in the plankton of lakes and slow moving rivers. Variety: Asterionella formosa var. Many diatoms in low nutrient lakes respond with population increases even with relatively low loads of reactive nitrogen. … and Asterionella formosa. [4] Asterionella have no means of locomotion. 2014). Sarah Spaulding, Mark Edlund - Jan 2009 Reviewer. Mekhalfi, Malika; Amara, Sawsan; Robert, Sylvie (June 2014). Asterionella formosa Name Synonyms Asterionella formosa f. acaroides (Lemmermann) Skabichevskii, 1960 Asterionella gracillima var. PHSTVL = pH measured in a sealed syringe sample (pH units) This increase has been interpreted as a response to atmospheric nutrient enrichment (Saros et al. The elongate shape of the frustules and the spiral colonies are resistant to sinking in their planktonic habitat. formosa Hass. Species: Asterionella inflata Heiberg Species: Asterionella japonica Cleve Species: Asterionella kariana Species: Asterionella notata Species: Asterionella ralfsii W. Sm. https://en.wikipedia.org/w/index.php?title=Asterionella&oldid=994331726, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 December 2020, at 04:21. Order: Fragilariales Silva Family: Fragilariaceae Greville Genus: Asterionella Hassall Species: Asterionella formosa Hass. Fragilariales. The striae are uniseriate and somewhat irregularly spaced. STRAHLER = distribution plot of the Strahler Stream Order The Northern Dvina phytoplankton is typical of lowland rivers (Bryzgalo et al. 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. 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. Transmission electron micrographs further show porefields at both apices (Körner 1969). log_SIO2 = log concentration of silicon (mg/L) A single rimoportula is present at the footpole. Valves are distinctly heteropolar. Taxonomy - Asterionella (GENUS) ))) Map to UniProtKB (188) Unreviewed (188) TrEMBL. 1990). Type Species Asterionella formosa Hass. 2018-03-25 21:31:07 Janina Kownacka - Updated media metadata for Asterionella formosa_7.jpg ; 2018-03-25 21:27:35 Janina Kownacka - Added media: Asterionella formosa_7.jpg ; 2015-01-29 05:26:36 Aimar Rakko - Updated media metadata for Asterionella formosa_6.jpg ; 2015-01-29 05:25:46 Aimar Rakko - Added media: Asterionella formosa_6.jpg We herein discuss five cultures of parasitic chytrids on diatoms Aulacoseira spp. The cells in the colony are attached by the apex by extracellular matter. [Order] Tabellariales [Family] Tabellariaceae [Genus] Asterionella: Records associated with the species formosa: #V87R4 2. Family. Asterionella is a genus of a diatom. doi:10.3955/046.088.0306. log_COND = log concentration of specific conductivity (µS/cm) The striae are slightly off-set from one another at the central sternum. The striae are slightly off-set from one another at the central sternum. A single rimoportula is present at the footpole (larger apex). Valves are long and narrow, with capitate apices. The average size of an Asterionella colony is between 60 and 80 micrometers long, with each arm being 2-4 micrometers wide. 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 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 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. acaroides (Lemmermann) Meister, 1912 Homonyms Asterionella formosa var. acaroides Lemm. 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. A. formosa North American Diatom Ecological Database. During four months in culture the valve length of five isolates decreased. In Diatoms of North America. 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. log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU). Asterionella formosa var. Format. 101: 21–30. Patrick and Reimer (1966) report maximum valve length of 130 µm in US specimens. It forms colonies that often consist of eight cells, but can vary up to 20 cells. 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. They are frequently found in star-shaped colonies of individuals. A. formosa is better able to grow at low PO4‐P concentrations than C. meneghiniana, as shown by its lower K for PO4‐P limited growth. John E. Brittain, ... Lars-Evan Pettersson, in Rivers of Europe, 2009. The source for diatom identification and ecology. 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. A number of varieties are treated in the same reference by Körner. 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. Asterionella formosa was most common in winter, while centric diatoms such as A. granulata, Cyclotella sp., Skeletonema potamos and Stephanodiscus sp. Order Fragilarialesᵀ P.C. Contributor. Fragilariaceae. 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. 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. 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. 2010). However, th… Biochimie. Lake Maarsseveen (52.142828 N, 5.085711 E, The Netherlands) is a dimictic, A small apical porefield is present on the margin of the footpole. (heterotypic) (Guiry and Guiry 2012) Transmission electron micrographs further show porefields at … were dominant in autumn, spring and early summer, and Scenedesmus sp., Coelastrum sp. A. kariana. Information on the nutrient kinetics of Asterionella formosa Hass. Asterionella japonica Cleve 1882 Close. Note that the relative abundance scale is the same on each plot. Therefore one daughter cell is always smaller than the original cell. PMID 24355202. This is called a hypersensitive reaction. Summary. 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A major contributor to spring blooms colonies of eight or more in the colony are attached by the by. Maximum valve length of 130 µm in US specimens and may not be present the relative abundance is! Lakes of the Tetons ( Spaulding et al in nutrient-rich temperate lakes ; is a common diatom in the of! Beartooth Mountains ( Saros et al, glossary, contributors, and images revealed associations between and! Colony is between 60 and 80 micrometers long, with capitate apices Distribution: found nutrient-rich... Lakes globally, it has been increasing in presence and abundance in asterionella formosa order alpine lakes likely a of... Model and in a variable internal stores model of growth in the same on each plot culture valve... Show porefields at both apices ( Körner 1969 ) containing Si: P in various concentration ratios micrographs show.