Download or read book Primary Production Biomass Nutrient Limitation and Taxonomic Composition of Algal Communities Epiphytic on the Submersed Macrophyte Myriophyllum Spicatum L in a Hardwater Eutrophic Lake written by Ralph Christian Jones and published by . This book was released on 1980 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Wastewater Treatment Facilities on Wetlands in the Midwest written by and published by . This book was released on 1983 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1985 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1981 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Algal Primary Production in Prairie Wetlands written by Rhonda L. McDougal and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: I studied algal primary production in prairie wetlands, and impacts of anthropogenic nutrient loading, changes in light and temperature, and the presence or absence of macrophytes in the water column. I manipulated nitrogen and phosphorus loading, macrophyte abundance, temperature, and photosynthetically active radiation. My study sites were two Ramsar wetlands, Delta Marsh, an 18,500 ha lacustrine marsh, and Oak Hammock Marsh, a 2,400 ha diked marsh. I hypothesized that algae would contribute significantly to primary production in prairie wetlands, on a scale comparable to or exceeding macrophyte production. The objective in Delta Marsh was to promote a shift from an epiphyton- and submersed macrophyte-dominated marsh (clear water state) to a phytoplankton-dominated turbid state by manipulating macrophyte abundance and inorganic nutrient loading in large enclosures. One objective of my survey of algal and macrophyte abundance in Oak Hammock Marsh was to quantify the contribution of all algal and macrophyte communities to total wetland primary production. Other objectives were to develop a photosynthesis model for each wetland algal assemblage based on photosynthesis-irradiance relationships, and to determine the major limiting resource for algal primary production. I found that algae contribute significantly to primary production in prairie wetlands. In Delta Marsh, algae contributed 34% to standing crop in unmanipulated mesocosms, and 57% to standing crop in nutrient enriched mesocosms. In Oak Hammock Marsh, algae contributed 62% and 68% of total annual primary production in two consecutive years. Phytoplankton responded to nutrient addition, both in the presence of macrophytes and when they were absent. Therefore, the nutrient addition treatments did promote a more turbid state, but the likelihood of a complete switch from clear water to a turbid state in the enclosures was equivocal. This is because periphyton and epiphyton showed a similar magnitude of response to nutrient addition as phytoplankton did, providing an important buffering mechanism within the enclosures by sequestering large amounts of added nutrients. The photosynthesis model, developed from experimentally determined photosynthesis parameters, was able to predict accurate daily productivity estimates when compared with in situ measurements. Light was the single most limiting resource for algae in Oak Hammock Marsh.
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of the Epiphytic Algal Communities to Experimentally Elevated Nutrient Levels in Intertidal Salt Marsh Habitats written by Stephanie Amy Verhulst and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Epiphytes are organisms attached to plants and are responsible for the majority of primary productivity in many aquatic systems. While epiphytes serve as a valuable food resource to herbivores, they may prove deleterious to the host plant by competing for light and nutrients, as well as increasing sheer stress. This study evaluated the impacts of nutrient additions, nitrogen and phosphorus, on the epiphytic algal community on Spartina alterniflora over the course of two growing seasons. Three nutrient treatments (N, P, and N+P) and one control treatment were placed in a salt marsh in the Tolomato River during the growing seasons of 2011 and 2012. To assess community development, we examined biomass, ash-free dry mass (AFDM), chlorophyll-a levels, cell counts, and community diversity by algal division. The nutrient additions did not significantly alter any of the measured parameters in either sampling year. However, the sampling month did have a significant (pa, and community composition. A total of 155 infrageneric taxa were identified. Biomass tended to be dominated by diatoms and red algae, while cyanobacteria were most abundant. In both years, biomass was highest in the spring with a second smaller pulse in the fall. Conversely, chlorophyll-a levels varied between the years and did not show the same monthly patterns as AFDM. A laboratory study subjecting S. alterniflora to the same nutrient additions also found no significant effects of increased nutrients, but did observe temporal changes in biomass and chlorophyll-a levels. Overall, epiphytic growth was not influenced by nutrient additions in this study suggesting that this and other similar salt marsh systems may be resilient to anthropogenic eutrophication. Instead, other factors, such as light and herbivory, likely played a key role in determining epiphytic algal growth and community composition.
Download or read book A Comparison of Epiphytic Algal Communities Growing on Natural and Artificial Macrophytes in an Eutrophic Lake written by Glenn A. Bechtel and published by . This book was released on 1994 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Description of the Epiphytic Epipelic and Planktonic Algal Communities in Two Shallow Eutrophic Lakes in Southwestern Manitoba written by Jennifer Joyce Shamess and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Species composition and biomass (expressed as cell volume and chlorophyll a) of the epiphytic, epipelic and planktonic algal communities of the littoral zones in two shallow prairie lakes were examined and the periphytic communities on Typha latifolia and cellulose acetate were compared. Species diversity was considerably lower in all communities studied than previously reported values. The Bacillariophyceae contributed large volumes, often 90-100% of the total community in the epiphytic communities on Typha and in the epipelon in both Lakes 255 and 623. The epiphyton on the artificial substrates (smooth and roughened) in L255 was dominated by the Cyanophyta which often contributed more than 45% of the total communitv. In L623 the communities on the smooth and roughened acetate were almost completely dominated by the green alga Stigeoclonium nanum which frequently comprised 90-100% of the total community. Seasonal mean biomass estimates expressed as cell volume and chlorophyll a in both lakes were lowest among the epiphyton and highest in the epipelon. Generally the epiphytic and epipelic biomass estimates were lower in L255 than in L623 but the phytoplankton biomass expressed as cell volume and chlorophyll a was much higher in L255 than L623. However in only 3 of the 10 communities investigated during 1979 did the seasonaL cell volume and chlorophyll a biomass estimates correlate significantly. Cell volume was considered to be a much better method of biomass determination than chlorophyll a when comparisons were made with the actual species present. The epiphytic algal communities on smooth and roughened cellulose acetate compared to those on Typha displayed comparable seasonal mean cell volume estimates only. Community composition differed significantly and in all cases the values obtained as either species composition or biomass demonstrated great similarity bethween the populations on the two artificial substrates but never between the artificial and natural substrate.
Download or read book Algal Ecology written by and published by Academic Press. This book was released on 1996-06-03 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algae are an important component of aquatic benthic ecosystems because they reflect the health of their environment through their density, abundance, and diversity. This comprehensive and authoritative text is divided into three sections to offer complete coverage of the discussion in this field. The first section introduces the locations of benthic algae in different ecosystems, like streams, large rivers, lakes, and other aquatic habitats. The second section is devoted to the various factors, both biotic and abiotic, that affect benthic freshwater algae. The final section of the book focuses on the role played by algae in a variety of complex freshwater ecosystems. As concern over environmental health escalates, the keystone and pivotal role played by algae is becoming more apparent. This volume in the Aquatic Ecology Series represents an important compilation of the latest research on the crucial niche occupied by algae in aquatic ecosystems. - Presents algae as the important player in relation to environmental health - Prepared by leading authorities in the field - Includes comprehensive treatment of the functions of benthic algae as well as the factors that affect these important aquatic organisms - Acts as an important reference for anyone interested in understanding and managing freshwater ecosystems
Download or read book Primary Productivity Chemo organotrophy and Nutritional Interactions of Epiphytic Algae and Bacteria on Macrophytes in the Littoral of a Lake written by Harold LeRoy Allen and published by . This book was released on 1969 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Variation in Biomass of the Dominant Submersed Macrophytes and Associated Algal Epiphytes in Lake Okeechobee Florida written by Margaret Sherrie Hopson-Fernandes and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phytoplankton Biomass and Algal Composition in Natural Fertilized and Polluted Subarctic Lakes written by Staffan Holmgren and published by . This book was released on 1983 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on 600 quantitative algal analysis from 1971-1980 the seasonal variations of phytoplankton biomass and species diversity have been evaluated in one natural, three fertilized and one polluted subarctic lake before and after nutrient reduction.
Download or read book Contrasting Patterns of Nutrient Limitation in the Littoral and Pelagic Zones of Mesotrophic Maine Lakes written by Grace C. Neumiller and published by . This book was released on 2021 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intense nutrient loading of nitrogen (N) and phosphorus (P) causes sudden regime shifts in freshwater ecosystems from clearwater to turbid conditions with frequent cyanobacterial blooms. Characterization of nutrient limitation patterns of primary productivity in these ecosystems is necessary for effective management of algal blooms. However, much of this research has focused on pelagic habitats. The influence of lake habitat (i.e. benthic littoral versus pelagic zones) on nutrient limitation of primary production in mesotrophic lakes is largely unknown, particularly in contrast to research on pelagic nutrient limitation in eutrophic systems. Using paired nutrient diffusing substrata and mesocosm experiments, we measured chlorophyll-a (chl-a) concentrations in response to 4 nutrient treatments (N, P, N + P, Control) to assess nutrient limitation patterns in littoral and pelagic zones of two temperate, mesotrophic lakes in late summer, prior to the fall mixing period (October 2020). While both lakes are mesotrophic, China Lake has approximately 2.18 times higher overall average [chl-a] in the water column than Great Pond in this late stratification period. In the pelagic zone, China Lake phytoplankton are colimited by N and P, while Great Pond phytoplankton are P limited. In the benthic zone, China Lake periphyton are serially limited by N then P, and Great Pond periphyton are N limited. These data will improve our understanding of nutrient limitation patterns in mesotrophic systems in danger of eutrophication and allow us to incorporate littoral zone production into our understanding of whole lake ecosystem productivity.
Download or read book Nutrient Distribution and Algal Community Composition in a Residential Eutrophic Pond written by Marika Paulina Krupitsky and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eutrophication and harmful algal blooms are a worldwide problem that contribute to long term habitat disturbance and pose potential health and safety threats for both humans and natural ecosystems. Algal overgrowths, especially harmful algal blooms dominated by cyanobacteria, are rising in prominence because of climate change and are expected to continue appearing in areas with high volumes of nutrient runoff in coming years. This senior project is a two-part study with an observational and experimental component focusing on eutrophication, algal blooming, and bloom mitigation in a residential eutrophic pond. I assessed the condition of a small residential eutrophic pond to determine the nutrient concentrations and algal community composition. Using a mesocosm experiment, I then tested the effects of an algaecide treatment that is intended to control algal overgrowths by adding 'beneficial bacteria' that consume excess organic matter. Based on my surveys of the pond, the eutrophication in the pond is likely caused by a combination of internal and external loading, with nutrient storage occurring in the sediment and entering through the inlet. The algal communities of the pond were unique at varying depths and sites, with a total of 30 different morphotypes located throughout the pond. The 'beneficial bacteria' product was not found to be effective in the removal of cyanobacteria blooming and is not the recommended method of HAB management for this pond.
Download or read book Effects of Nutrient Enrichment on Biomass and Primary Production of Sediment Micro Algae in Halodule Wrightii Ascherson shoalgrass Seagrass Beds written by Philip Bucolo and published by . This book was released on 2006 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eutrophication of coastal waters often leads to excessive growth of microalgal epiphytes attached to seagrass leaves. However, the effect of increased nutrient levels on sediment microalgae has not been studied within seagrass communities. A slow-release NPK Osmocote fertilizer was added to sediments within and outside beds of shoal grass Halodule wrightii Ascherson, in Big Lagoon, Perdido Key, FL. Gross primary production (GPP) and biomass (HPLC photopigments) of sediment microalgae within and adjacent to fertilized and control H. wrightii beds were measured following two enrichment periods during June and July 2004. There was no effect of position on sediment microalgal GPP or biomass. However, nutrient enrichment significantly increased GPP in both June and July, whereas sedimentary chlorophyll a and fucoxanthin (proxies of total microalgal and diatom biomass respectively) increased only in June. These results suggest that sediment microalgae could fill some of the void in primary production where seagrass beds disappear.
Download or read book Shallow Lakes 95 written by Lech Kufel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow lakes differ from deep ones in many aspects of nutrient dynamics, biotic structure and interactions of various trophic levels. Though very common in European lowlands, shallow lakes attract inadequate attention from research teams. This book aims at filling gaps in our knowledge of the processes which take place in non-stratified lakes. It contains proceedings from the international conference `Shallow Lakes *95' held in Mikolajki, Poland, on 20-26 August 1995. In more than 50 original papers up-to-date views on eutrophication, degradation and recovery of shallow lakes are presented. The first four sections of the book (Nutrient fluxes, Biotic structure, Trophic interactions and Whole lake studies) deal with theoretical aspects of lake functioning while the fifth (Biomanipulation, restoration and management) is devoted to practical measures undertaken to improve water quality in shallow lakes. The book is therefore addressed to university biologists and ecologists and PhD students, as well as to managers involved in restoration of shallow lakes.
