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British Stoneworts Charophyta
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Book Synopsis British Stoneworts (Charophyta) by : Guy Oldfield Allen
Download or read book British Stoneworts (Charophyta) written by Guy Oldfield Allen and published by . This book was released on 1950 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis British Stoneworts-Charophyta. [By] G.O. Allen by : Haslemere Microscope and Natural History Society (HASLEMERE)
Download or read book British Stoneworts-Charophyta. [By] G.O. Allen written by Haslemere Microscope and Natural History Society (HASLEMERE) and published by . This book was released on 1950 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Environmental Range and Tolerance Level of British Stoneworts (charophytes). by : Stephen John Lambert
Download or read book The Environmental Range and Tolerance Level of British Stoneworts (charophytes). written by Stephen John Lambert and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Environmental Range AndTolerance Limits OfBritish Stoneworts (Charophytes) by : Stephen John Lambert
Download or read book The Environmental Range AndTolerance Limits OfBritish Stoneworts (Charophytes) written by Stephen John Lambert and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Charophytes playa significant role in ecological succession and the community structure of many water bodies. Thirty three species have been recorded in the UK; however the future existence of 17 species. is now considered threatened due to habitat degradation and loss. The aim of this thesis was to investigate limits of environmental tolerance for British charophytes with particular reference to water quality and rarer species. The work was carried out in four stages: 1. Field surveys at 49 major British charophyte sites (2004-2007) to record (a) the abundance of all macrophyte species, (b) charophyte perfonnance as indicated by the efficiency of photosystem IT - (Fv/Fm), and (c) the chemical and physical properties of waters and sediment. 2. Intensive studies at three nationally important charophyte sites: Slapton Ley (Devon), Orton Pits (Cambridgeshire) and Hickling Broad (Norfolk) to include analysis of interstitial water chemistry. 3. Probabilistic detennination of environmental ranges for charophytes as derived via pair wise and multivariate statistical analysis of collected field data. 4. Hypotheses generated from analysis ofthe field data to demonstrate that environmental concentrations of copper, inorganic phosphate and salinity were key limiting factors of charophyte survival were tested via a series of laboratory investigations. The survey results indicate that the probability of charophytes occupying a site is dependent upon minimum concentrations of filterable calcium, chloride, magnesium, sodium, and sulphate; it was also limited by maximum environmental concentrations of filterable cobalt (0.36,ugr1), copper (4.9,ugr1), manganese (16 mgr1), nitrate (2.6 mgr1 0.58 mgr1 N), inorganic phosphate (56,ugr1, 18.3,ugr1 P) and silicate (6.2 mgr1) • The probability of finding charophytes decreased significantly in waters of high lightextinction coefficient (Kd> 4.4), in fluid sediments or under competitive canopies. The probability of charophyte presence at a site is greatly reduced by· competitive succession pressure from Phragmites australis. Charophyte species may be grouped according to tolerance of the conductivity of open and interstitial waters and also according to interstitial water Eh and pH. Charophytes are also sensitive to low open water Eh, which is reflected as photosystem-IT stress. Environmental nitrate concentrations pose the widest threat to charophyte habitats, whilst dissolved cobalt lowers probability of presence at the lowest concentrations; copper, manganese and inorganic phosphate were also shown to limit the probability of charophyte survival at concentrations commonly recorded in the field. Of three SSSI sites investigated, none was in favourable condition: Slapton Ley was in danger of succeeding to Carr and reed-swamp, Hickling Broad contained no charophytes by 2007 and Orton Pits (Cambridgeshire) was suffering from diffuse nitrate and phosphorus pollution, with point-source pollution from copper. The results of the laboratory experiments re-enforced the field survey findings showing that copper caused reduced growth at 50,ugrl in all species tested, with a reduction of photosynthetic function at 100,ugrl . This concentration also caused a loss of rhizoids in Chara intermedia, and is similar to the mean copper concentrations (97,ugrl) recorded at 70 sample points in the interstitial waters ofHickling Broad in August 2006. Growth rates of Charophytes cultured in a phosphate rich solution were significantly reduced at 100,ugrl P04 (32.6,ugrl P), however photosynthetic function remained unstressed suggesting alternative mechanisms of interference. Changes in salinity were shown to affect growth and photosynthetic function in three species previously common to Hickling Broad in different ways; Chara intermedia performed best at 12.5-25% addition of seawater to the recent median salinities, however Chara connivens and Nitellopsis obtusa performed better at a 12.5% reduction from recent median salinities. The results suggest that should recovery ever take place, changes in salinity are likely to affect the charophyte species assemblage in Hickling Broad and that such a recovery is likely to be hindered by deep sediments, interstitial heavy metal concentrations, internal phosphorus reserves and saline ingress.
Book Synopsis Red Data Books of Britain and Ireland by : N. F. Stewart
Download or read book Red Data Books of Britain and Ireland written by N. F. Stewart and published by . This book was released on 1992 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lower plant conservation has moved forward considerably. This book represents a joint venture between the nature and conservation agencies of Ireland and the United Kingdom. There are only 33 species of the algae called Stoneworts in Ireland and the UK, but they are of great ecological significance, often carpeting vast areas in freshwater lakes and forming an important source of food for diving ducks. A high proportion of the group is regarded as threatened. This book aims to bring stoneworts to the wider attention of those who manage sites for nature conservation.
Download or read book Important Stonewort Areas written by and published by . This book was released on 2004 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Important Stonewort Areas by : Nick Stewart
Download or read book Important Stonewort Areas written by Nick Stewart and published by . This book was released on 2004 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polish Charophytes by : Jacek Urbaniak (biologia)
Download or read book Polish Charophytes written by Jacek Urbaniak (biologia) and published by . This book was released on 2014 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stoneworts written by Dr. Stephen Lambert and published by . This book was released on 2009 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Preliminary Report on Important Sites for Stoneworts in Great Britain by : Gavin Stark
Download or read book A Preliminary Report on Important Sites for Stoneworts in Great Britain written by Gavin Stark and published by . This book was released on 1994 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Stoneworts of Sussex by : Frances Abraham
Download or read book The Stoneworts of Sussex written by Frances Abraham and published by . This book was released on 2020 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stoneworts written by and published by . This book was released on 2011 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Management and Ecology of Freshwater Plants by : Joseph Caffrey
Download or read book Management and Ecology of Freshwater Plants written by Joseph Caffrey and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a growing need for appropriate management of aquatic plants in rivers and canals, lakes and reservoirs, and drainage channels and urban waterways. This management must be based on a sound knowledge of the ecology of freshwater plants, their distribution and the different forms of control available including chemical, physical, biological and biomanipulation. This series of papers from over 20 different countries was generated from the highly successful European Weed Research Society symposia on aquatic plant management, this being the ninth. The contributions provide a valuable insight into the complexities involved in managing aquatic systems, discuss state-of-the-art control techniques such as biomanipulation using fish and waterfowl and the use of straw, and deal with patterns of regrowth and recovery post-management. Careful consideration is given to the use of chemicals, a practice which has come under scrutiny in recent years. Underpinning the development of such control techniques is a growing body of knowledge relating to the biology and ecology of water plants, including growth responses under different trophic conditions, the impact of pollution, and aspects of photosynthesis. The authorship of the papers represents the collective wisdom of leading scientists and experts from fisheries agencies, river authorities, nature conservation agencies, the agrochemical industry and both governmental and non-governmental organisations.
Book Synopsis Freshwater Algae by : Edward G. Bellinger
Download or read book Freshwater Algae written by Edward G. Bellinger and published by John Wiley & Sons. This book was released on 2011-09-20 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater Algae: Identification and Use as Bioindicators provides a comprehensive guide to temperate freshwater algae, with additional information on key species in relation to environmental characteristics and implications for aquatic management. The book uniquely combines practical material on techniques and water quality management with basic algal taxonomy and the role of algae as bioindicators. Freshwater Algae: Identification and Use as Bioindicators is divided into two parts. Part I describes techniques for the sampling, measuring and observation of algae and then looks at the role of algae as bioindicators and the implications for aquatic management. Part II provides the identification of major genera and 250 important species. Well illustrated with numerous original illustrations and photographs, this reference work is essential reading for all practitioners and researchers concerned with assessing and managing the aquatic environment.
Book Synopsis Freshwater Algae of North America by : John D. Wehr
Download or read book Freshwater Algae of North America written by John D. Wehr and published by Elsevier. This book was released on 2015-06-05 with total page 1067 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater Algae of North America: Ecology and Classification, Second Edition is an authoritative and practical treatise on the classification, biodiversity, and ecology of all known genera of freshwater algae from North America. The book provides essential taxonomic and ecological information about one of the most diverse and ubiquitous groups of organisms on earth. This single volume brings together experts on all the groups of algae that occur in fresh waters (also soils, snow, and extreme inland environments). In the decade since the first edition, there has been an explosion of new information on the classification, ecology, and biogeography of many groups of algae, with the use of molecular techniques and renewed interest in biological diversity. Accordingly, this new edition covers updated classification information of most algal groups and the reassignment of many genera and species, as well as new research on harmful algal blooms. Extensive and complete Describes every genus of freshwater algae known from North America, with an analytical dichotomous key, descriptions of diagnostic features, and at least one image of every genus. Full-color images throughout provide superb visual examples of freshwater algae Updated Environmental Issues and Classifications, including new information on harmful algal blooms (HAB) Fully revised introductory chapters, including new topics on biodiversity, and taste and odor problems Updated to reflect the rapid advances in algal classification and taxonomy due to the widespread use of DNA technologies
Book Synopsis Charophytes of Great Britain and Ireland by : Jenny A. Moore
Download or read book Charophytes of Great Britain and Ireland written by Jenny A. Moore and published by . This book was released on 1986 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Freshwater Algal Flora of the British Isles by : David M. John
Download or read book The Freshwater Algal Flora of the British Isles written by David M. John and published by . This book was released on 2021-08-05 with total page 897 pages. Available in PDF, EPUB and Kindle. Book excerpt: First comprehensive guide of its kind, this volume is essential for any study of freshwater algae in the British Isles.