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Structural Features of Unicellular Desmids (Desmidiales) When Examined in a Scanning Electron Microscope © O
BOTANICHESKII ZHURNAL, 2021, Vol. 106, N 6, pp. 523–528 COMMUNICATIONS Structural Features of Unicellular Desmids (Desmidiales) when Examined in a Scanning Electron Microscope © O. V. Anissimovaa,# and A. F. Luknitskayab,## a Zvenigorod Biological Station, M.V. Lomonosov Moscow State University Leninskiye Gory, 1/12, Moscow, 119234, Russia b Komarov Botanical Institute RAS Prof. Popov Str., 2, St. Petersburg, 197376, Russia #e-mail: [email protected] ##e-mail: [email protected] DOI: 10.31857/S0006813621060028 We have demonstrated the possibility of using scanning electron microscopy methods for studying the mor- phology and ornamentation of the cell wall of unicellular species of desmid algae (Charophyta, Zygnemato- phyceae). Scanning electron microscopy was used to confirm and refine the identification of taxa with 10 spe- cies as an example: Cosmarium sp., C. anceps, C. granatum, C. nymannianum, C. pokornyanum, Euastrum bidentatum, E. crassicolle, E. luetkemuelleri, E. oblongum, Pleurotaenium ehrenbergii. The use of electron microscope enables a more subtle and qualitative study of the cell wall surface. We con- sidered the difficulties arising when working with cells of desmids in scanning electron microscopy. Attention should be paid to the artifacts arising from the preparation of samples for the study of algae in scanning elec- tron microscopy: mucus plugs and abundant accumulation of mucus on the cell surface, “molting” process and asymmetry in the development of the semicells. Keywords: Сharophyta, Zygnematophyceae, cell wall, morphology, taxonomy, scanning electron microscope ACKNOWLEDGEMENTS Brook A.J. 1981. The biology of desmids. Oxford. 276 p. The studies were carried out within the framework of the Kosinskaya E.K. 1960. Flora sporovykh rasteniy SSSR. -
The Desmids of the West End of Lake Erie1-2
THE DESMIDS OF THE WEST END OF LAKE ERIE1-2 CLARENCE E. TAFT INTRODUCTION For several years the writer has had the opportunity to study the desmids of the Island Region of the west end of Lake Erie. First in 1933, and later while a member of the staff of the Franz Theodore Stone Laboratory on Gibraltar Island in Put-in-Bay Harbor during the summers of 1938, 1940, and 1941. Collections made from the open lake, shore margins, and from ponds and beach pools on the Islands were augmented during; the interim from 1933 to 1938 by collections made by Tiffany during his work on "The plankton algae of the west end of Lake Erie" (1934) and "The filamentous algae of the west end of Lake Erie" (1937). The writer gratefully acknowledges these collections, as well as many collections placed at his disposal by members of the fresh-water algae classes at the StoneLaboratory. The writer hopes that this report, the latest in a series on the algae of the region will be not only of taxonomic interest, but helpful to the student of aquatic biology. For the benefit of; the, latter the'paper; has been prepared in somewhat greater detail than would otherwise be necessary,; .: ••••.-.-> .-•"•-. Two groups remain toK be reported!. They are the Dinophyceae (which has been; only superficially worked) and the Bacillariophyeeaei Of the two classes, the representatives of the latter are,far more numerous, and at times constitute air important bulk; of the plankton. 11: is hoped that in the near future: this group may receive the attention that its importance deserves. -
The Genus Euastrum Ehrenberg Ex Ralfs (Desmidiaceae) in a Subtropical Stream Adjacent to the Parque Nacional Do Iguaçu, Paraná State, Brazil
Hoehnea 44(1): 1-9, 26 fig., 2017 http://dx.doi.org/10.1590/2236-8906-55/2016 The genus Euastrum Ehrenberg ex Ralfs (Desmidiaceae) in a subtropical stream adjacent to the Parque Nacional do Iguaçu, Paraná State, Brazil Camila Akemy Nabeshima Aquino1,2,3, Norma Catarina Bueno1,2, Liliane Caroline Servat1,2 and Jascieli Carla Bortolini2 Received: 7.07.2016; accepted: 8.11.2016 ABSTRACT - (The genus Euastrum Ehrenberg ex Ralfs (Desmidiaceae) in a subtropical stream adjacent to the Parque Nacional do Iguaçu, Paraná State, Brazil). This study aimed to document the species of Euastrum (Desmidiaceae) in a subtropical stream adjacent to an important environmental protection area, the Parque Nacional do Iguaçu, in the extreme west of Paraná State, Brazil. For this purpose, monthly samplings of periphytic material associated to Eleocharis minima Kunth were performed in the period between August 2012 and July 2013. This taxonomic inventory allowed the identification of 12 taxa at specific and infraespecific level. Eight new occurrences were recorded for Paraná State:Euastrum attenuatum var. splendens, E. bidentatum var. bidentatum, E. cornubiense var. cornubiense, E. croasdaleae var. croasdaleae, E. denticulatum var. quadrifarium, E. didelta var. quadriceps, E. elegans var. elegans and E. evolutum var. incudiforme. Keywords: biodiversity, desmids, Freshwater, taxonomy, Zygnematophyceae RESUMO - (O gênero Euastrum Ehrenberg ex Ralfs (Desmidiaceae) em um riacho subtropical, área adjacente ao Parque Nacional do Iguaçu, PR, Brasil). Este estudo objetivou documentar as espécies do gênero Euastrum (Desmidiaceae) em um riacho subtropical adjacente a uma importante área de proteção ambiental, o Parque Nacional do Iguaçu, no extremo oeste do Estado do Paraná, Brasil. -
Desmid of Some Selected Areas of Bangladesh
Bangladesh J. Plant Taxon. 12(1): 11-23, 2005 (June) DESMIDS OF SOME SELECTED AREAS OF BANGLADESH. 3. DOCIDIUM, PLEUROTAENIUM, TRIPLASTRUM AND TRIPLOCERAS A. K. M. NURUL ISLAM AND NASIMA AKTER Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh Key words: Desmids, Docidium, Pleurotaenium, Triplastrum, Triploceras, Bangladesh Abstract 23 taxa belonging to Pleurotaenium, 2 under Triploceras and 1 each under Docidium and Triplastrum have been recorded in this paper from some selected areas of Bangladesh. Of these, 11 are new records for the country. Introduction This is the third paper in a series under the above title. The first and second papers with the same title have already been published in this journal (Islam and Akter 2004 and Islam and Begum 2004). The present paper includes the species belonging to Docidium, Pleurotaenium, Triplastrum and Triploceras from the same selected areas as mentioned in the above papers. The illustrated descriptions of these taxa are given below. For materials and methods, dates and places of collections and other information see Islam and Akter (2004). Taxonomy Class: Chlorophyceae; Order Desmidiales; Family: Desmidiaceae A total of 27 taxa (Docidium 1, Pleurotaenium 23, Triplastrum 1 and Triploceras 2) have been described with diagrams and photomicrographs. Of these, 11 taxa are new records for the country (marked by *). Genus: Docidium de Brebisson 1844 em. Lundell 1871 Cells straight, cylindrical, smooth, or with undulate margins, 8-26 times longer than broad; circular in cross section, slightly constricted in the midregion, with an open sinus; apex usually truncate, rounded, sometimes dilated, smooth or rarely with a few intramarginal granules; base of semicell inflated, with 6-9 visible folds (plications) at the isthmus, the folds usually subtended by granules; cell wall smooth or faintly punctulate; chloroplast axial with irregular longitudinal ridges and 6-14 axial pyrenoids; zygospore unknown. -
New Desmid Records from High Mountain Lakes in Artabel Lakes Nature Park, Gümüşhane, Turkey
Turkish Journal of Botany Turk J Bot (2019) 43: 570-583 http://journals.tubitak.gov.tr/botany/ © TÜBİTAK Research Article doi:10.3906/bot-1810-71 New desmid records from high mountain lakes in Artabel Lakes Nature Park, Gümüşhane, Turkey 1, 2 Bülent ŞAHİN *, Bülent AKAR 1 Department of Biology Education, Fatih Education Faculty, Trabzon University, Trabzon, Turkey 2 Department of Food Engineering, Faculty of Engineering and Natural Sciences, Gümüşhane University, Gümüşhane, Turkey Received: 30.10.2018 Accepted/Published Online: 15.04.2019 Final Version: 08.07.2019 Abstract: The algal flora of 17 lakes and 1 pond in the Artabel Lakes Nature Park were investigated during two summer seasons (2013 and 2016). In total, 26 desmid taxa were found and identified as new records for the desmid flora of Turkey based on their morphotaxonomic characteristics and ecological preferences. The taxa identified belong to the genera Actinotaenium (1), Closterium (1), Cosmarium (15), Micrasterias (1), Spondylosium (1), Staurastrum (5), Teilingia (1), and Tetmemorus (1). Morphotaxonomy, ecology, and distribution of each species were discussed in detail. Key words: Desmids, new records, high mountain lakes, Artabel Lakes Nature Park, Turkey 1. Introduction Desmids are an integral part of benthic habitats of Desmid habitats are exclusively freshwater (Coesel and high mountain lakes; in particular, those of the Northern Meesters, 2007; Kouwets, 2008). Desmids usually prefer Hemisphere (Medvedeva, 2001; Sterlyagova, 2008). In acidic or pH-circumneutral, nutrient-poor, and clear the period from 1998 to 2014, 43 new records of desmid waters (Lenzenweger, 1996; Coesel and Meesters, 2007). species from high mountain lakes in the eastern Black It is well known that members of order Desmidiales Sea Region were identified and published (Şahin, 1998, exhibit great diversity in their external morphology and 2000, 2002, 2007, 2008, 2009; Şahin and Akar, 2007; Akar also have remarkably complex cell symmetry (Lee, 2015). -
Life Strategies of Selected Algae Species Along the Habitat Gradient on Peat Bogs
Ecological Questions 13/2010: 55 – 66 DOI: 10.2478/v10090–010–0016–x Life strategies of selected algae species along the habitat gradient on peat bogs Urszula Jacuńska Department of Plant Ecology and Nature Conservation, Institute of Environment Protection, Nicolaus Copernicus University, Gagarina 9, 87-100 Toruń, Poland, e-mail: [email protected] Abstract. Autecological studies on some selected algae species were conducted in 1998 and 1999 on transition mires and raised bogs situated in the water and peat-bog nature reserve „Dury” in the Wdecki Landscape Park. Apart from forms co-dominating at all studied sites, such as Penium silvae-nigrae f. parallelum or Anisonema ovale, also forms that occurred occasionally were selected for autecological studies, such as e.g. Tetmemorus brebissonii var. brebissonii occurring in summer, or Chroococcus turgidus connected with sites situated near the water table. From the literature data it appears that the selected algae species, perhaps with exception of Petalomonas sphagnophila, are cosmopolitan organisms, characteristic of oligotrophic raised bogs. Species such as Anisonema ovale and Penium silvae-nigrae, despite different nutrition methods and different life „strategies”, have a similarly wide range of tolerance to changeable habitat parameters. They are eurytopic species, which can find their developmental optimum in all habitats. Chroococcus turgidus and Tetmemorus brebissonii are autotrophic species, which display certain characteristics corresponding to the K – strategy of development. They are stenotopic species connected with a highly hydrated habitat of low electrolytic conductivity and low concentration of biogenic substances. From the data presented in this paper, it appears that there exists a certain ecological group of algae adapted to life in raised bogs. -
Table of Contents
Table of Contents General Program………………………………………….. 2 – 5 Poster Presentation Summary……………………………. 6 – 8 Abstracts (in order of presentation)………………………. 9 – 41 Brief Biography, Dr. Dennis Hanisak …………………… 42 1 General Program: 46th Northeast Algal Symposium Friday, April 20, 2007 5:00 – 7:00pm Registration Saturday, April 21, 2007 7:00 – 8:30am Continental Breakfast & Registration 8:30 – 8:45am Welcome and Opening Remarks – Morgan Vis SESSION 1 Student Presentations Moderator: Don Cheney 8:45 – 9:00am Wilce Award Candidate FUSION, DUPLICATION, AND DELETION: EVOLUTION OF EUGLENA GRACILIS LHC POLYPROTEIN-CODING GENES. Adam G. Koziol and Dion G. Durnford. (Abstract p. 9) 9:00 – 9:15am Wilce Award Candidate UTILIZING AN INTEGRATIVE TAXONOMIC APPROACH OF MOLECULAR AND MORPHOLOGICAL CHARACTERS TO DELIMIT SPECIES IN THE RED ALGAL FAMILY KALLYMENIACEAE (RHODOPHYTA). Bridgette Clarkston and Gary W. Saunders. (Abstract p. 9) 9:15 – 9:30am Wilce Award Candidate AFFINITIES OF SOME ANOMALOUS MEMBERS OF THE ACROCHAETIALES. Susan Clayden and Gary W. Saunders. (Abstract p. 10) 9:30 – 9:45am Wilce Award Candidate BARCODING BROWN ALGAE: HOW DNA BARCODING IS CHANGING OUR VIEW OF THE PHAEOPHYCEAE IN CANADA. Daniel McDevit and Gary W. Saunders. (Abstract p. 10) 9:45 – 10:00am Wilce Award Candidate CCMP622 UNID. SP.—A CHLORARACHNIOPHTYE ALGA WITH A ‘LARGE’ NUCLEOMORPH GENOME. Tia D. Silver and John M. Archibald. (Abstract p. 11) 10:00 – 10:15am Wilce Award Candidate PRELIMINARY INVESTIGATION OF THE NUCLEOMORPH GENOME OF THE SECONDARILY NON-PHOTOSYNTHETIC CRYPTOMONAD CRYPTOMONAS PARAMECIUM CCAP977/2A. Natalie Donaher, Christopher Lane and John Archibald. (Abstract p. 11) 10:15 – 10:45am Break 2 SESSION 2 Student Presentations Moderator: Hilary McManus 10:45 – 11:00am Wilce Award Candidate IMPACTS OF HABITAT-MODIFYING INVASIVE MACROALGAE ON EPIPHYTIC ALGAL COMMUNTIES. -
Freshwater Algae in Britain and Ireland - Bibliography
Freshwater algae in Britain and Ireland - Bibliography Floras, monographs, articles with records and environmental information, together with papers dealing with taxonomic/nomenclatural changes since 2003 (previous update of ‘Coded List’) as well as those helpful for identification purposes. Theses are listed only where available online and include unpublished information. Useful websites are listed at the end of the bibliography. Further links to relevant information (catalogues, websites, photocatalogues) can be found on the site managed by the British Phycological Society (http://www.brphycsoc.org/links.lasso). Abbas A, Godward MBE (1964) Cytology in relation to taxonomy in Chaetophorales. Journal of the Linnean Society, Botany 58: 499–597. Abbott J, Emsley F, Hick T, Stubbins J, Turner WB, West W (1886) Contributions to a fauna and flora of West Yorkshire: algae (exclusive of Diatomaceae). Transactions of the Leeds Naturalists' Club and Scientific Association 1: 69–78, pl.1. Acton E (1909) Coccomyxa subellipsoidea, a new member of the Palmellaceae. Annals of Botany 23: 537–573. Acton E (1916a) On the structure and origin of Cladophora-balls. New Phytologist 15: 1–10. Acton E (1916b) On a new penetrating alga. New Phytologist 15: 97–102. Acton E (1916c) Studies on the nuclear division in desmids. 1. Hyalotheca dissiliens (Smith) Bréb. Annals of Botany 30: 379–382. Adams J (1908) A synopsis of Irish algae, freshwater and marine. Proceedings of the Royal Irish Academy 27B: 11–60. Ahmadjian V (1967) A guide to the algae occurring as lichen symbionts: isolation, culture, cultural physiology and identification. Phycologia 6: 127–166 Allanson BR (1973) The fine structure of the periphyton of Chara sp. -
Microalgae of Protected Lakes of Northwestern Ukraine
Polish Botanical Journal 62(1): 61–76, 2017 e-ISSN 2084-4352 DOI: 10.1515/pbj-2017-0008 ISSN 1641-8190 MICROALGAE OF PROTECTED LAKES OF NORTHWESTERN UKRAINE Yuriy Malakhov 1, Olha Kryvosheia & Petro Tsarenko Abstract. The paper reports the first comprehensive study of microalgal species composition in four lakes of Volhynian Polissya (northwestern Ukraine), in which 271 species (279 intraspecific taxa) of 11 microalgal phyla were identified. Four dominant phytoplankton assemblages were determined for each lake. Bacillariophyta and Charophyta formed more than half (59.2%) of the taxonomic list, accounting for 94 and 66 species respectively. Desmidiaceae was the most diverse family, with 44 species (47 intraspecific taxa) of microalgae. The four lakes are highly dissimilar in species richness and composition, having only 8 (2.9%) species in common. Lake Cheremske had the highest number of algal species – 137 (144). Lake Bile, Lake Somyne and Lake Redychi were much less diverse, with 105, 79 (80) and 75 (78) species respectively. Morphological descriptions, original microg- raphies and figures are presented for a number of species, including some not previously documented in Ukraine: Chromulina cf. verrucosa G. A. Klebs, Eunotia myrmica Lange-Bert. and E. tetraodon Ehrenb. The lakes, which are almost pristine or are recovering, maintain diverse and valuable algal floras, making them important sites in the Pan-European ecological network. Key words: microalgae, diversity, distribution, phytoplankton, lakes, nature reserves, Volhynian Polissya -
Identification of Algae in Water Supplies
Identification of Algae in Water Supplies Table of Contents Section I Introduction to the Algae by George Izaguirre Section II Review of Methods for Collection, Quantification and Identification of Algae by Miriam Steinitz-Kannan Section III Bibliography Section IV Key for the identification of the most common freshwater algae in water supplies Section V Photographs and descriptions of the most common genera of algae found in water supplies. Appendix A Figures A-1–A-6 Algae — AWWA Manual 7, Chapter 10 Continue Credits Copyright © 2002 American Water Works Association, all rights reserved. No copying of this informa- tion in any form is allowed without expressed written consent of the American Water Works Association. Disclaimer While AWWA makes every effort to ensure the accuracy of its products, it cannot guarantee 100% accuracy. In no event will AWWA be liable for direct, indirect, special, incidental, or consequential damages arising out of the use of information presented on this CD. In particular AWWA will not be responsible for any costs, including, but not limited to, those incurred as a result of lost revenue. In no event shall AWWA's liability exceed the amount paid for the purchase of this CD Identification of Algae in Water Supplies Section I Back to Table of Contents George Izaguirre The algae are a large and very diverse group of organisms that rangefrom minute single-celled forms to the giant marine kelps. They occupy a wide variety of habitats, including fresh water (lakes, reservoirs, and rivers), oceans, estuaries, moist soils, coastal spray zones, hot springs, snow fields and stone or concrete surfaces. -
Botswana), a Subtropical Flood-Pulsed Wetland
Biodiversity and Biomass of Algae in the Okavango Delta (Botswana), a Subtropical Flood-Pulsed Wetland Thesis submitted for the degree of Doctor of Philosophy by LUCA MARAZZI University College London Department of Geography University College London December 2014 I, LUCA MARAZZI, confirm that the work presented in this thesis is my own. Where information has been derived from other sources, I confirm that this has been indicated in the thesis. LUCA MARAZZI 2 ABSTRACT In freshwater bodies algae provide key ecosystem services such as food and water purification. This is the first systematic assessment of biodiversity, biomass and distribution patterns of these aquatic primary producers in the Okavango Delta (Botswana), a subtropical flood-pulsed wetland in semiarid Southern Africa. This study delivers the first estimate of algal species and genera richness at the Delta scale; 496 species and 173 genera were observed in 132 samples. A new variety of desmid (Chlorophyta) was discovered, Cosmarium pseudosulcatum var. okavangicum, and species richness estimators suggest that a further few hundred unidentified species likely live in this wetland. Rare species represent 81% of species richness and 30% of total algal biovolume. Species composition is most similar within habitat types, thus varying more significantly at the Delta scale. In seasonally inundated floodplains, algal species / genera richness and diversity are significantly higher than in permanently flooded open water habitats. The annual flood pulse has historically allowed more diverse algal communities to develop and persist in these shallower and warmer environments with higher mean nutrient levels and more substrata and more heterogenous habitats for benthic taxa. These results support the Intermediate Disturbance Hypothesis, Species-Energy Theory and Habitat Heterogeneity Diversity hypotheses. -
No. 188 (21 April 2021) ISSN 2009-8987 Taxonomic And
No. 188 (21 April 2021) ISSN 2009-8987 Taxonomic and nomenclatural notes on desmids I. Euastrum circulare Hassall ex Ralfs and Euastrum sinuosum Lenormand ex W.Archer (Zygnematophyceae, Desmidiaceae) Olga V. Anissimova, Faculty of Biology, M.V. Lomonosov Moscow State University, Leninskie Gory, 1, building 12, Moscow, 119991, Russia (correspondence: [email protected]) Michael D. Guiry, AlgaeBase, Ryan Institute, NUI Galway, Galway H91 TK33, Ireland. The taxonomy and nomenclature of desmids is complex and difficult, particularly as the limitation of the Principle of Priority as applied to the “Desmidiaceae s.l. [in the broad sense]” resulted in the setting of the starting point for all desmids as 1 January 1848 and Ralfs (1848) was also set with this notional date of publication (ICN Art. 13.1, Turland & al. 2018). Designations applied to desmids prior to 1 January 1848 are thus devalidated and have no nomenclatural status other than providing taxonomic information. The name Euastrum sinuosum Kützing [Kützing 1849: 174, ‘Euastrum (?) sinuosum’] is an illegitimate name as it included in synonymy “Cosmarium crenatum Ralfs” (Ralfs 1844: 394; Ralfs 1848: 96, pl. XV: fig. 7). Whilst “Cosmarium crenatum Ralfs”, 1844 is a devalidated name, it was validated as Cosmarium crenatum Ralfs ex Ralfs (Ralfs 1848: 96, pl. XV: fig. 7). Euastrum sinuosum Kützing is thus an illegitimate name as it included in synonymy a valid and legitimate name. The valid name Euastrum sinuosum Lenormand ex W.Archer (in Pritchard 1861: 729) was subsequently introduced by William Archer (1830–1897) who included “E. circulare b (Rfs.) and “E. circulare, var. Falaisensis (Bréb.)”. Archer (in Pritchard 1861) was referring to Ralfs (1848: 85-86) in which Euastrum circulare Hassall ex Ralfs included “Euastrum circulare Hass.” (Hassall 1845: 383, pl.