Download or read book Cladophora in the Great Lakes written by Harvey Shear and published by Windsor : Great Lakes Research Advisory Board. This book was released on 1975 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Proceedings of a workshop based on a state of the art report by Mr. John H. Neil, Limnos Ltd., and held in Windsor, Ontario at the International Joint Commission's Regional Office, February 19-21, 1975, sponsored by the International Joint Commission's Research Advisory Board, Standing Committee on Eutrophication".
Download or read book The Nutrition of Great Lakes Cladophora written by Gerald C. Gerloff and published by . This book was released on 1976 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cladophora in the Great Lakes written by International Joint Commission. Research Advisory Board Standing Committee on Eutrophication and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cladophora in the Great Lakes written by Great Lakes Research Advisory Board and published by . This book was released on 1975 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Great Lakes Cladophora Model written by Lisa A. Tomlinson and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mapping of Major Cladophora Populations in the Great Lakes written by Martin T. Auer and published by . This book was released on 1981 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TOWARD A NEW MODELING APPROACH FOR MANAGEMENT OF NUISANCE CLADOPHORA GROWTH IN THE GREAT LAKES written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Cladophora glomerata, a filamentous green alga that grows on hard substrate, first started to attract significant attention in the mid-1970s, when the species spread in Lakes Huron, Erie, and Ontario. High concentrations of soluble reactive phosphorus in discharges led to increased Cladophora growth, which impaired beaches, ecosystem services, and water intakes. The Great Lakes Water Quality Agreement of 1972 (amended in 1978) presumably helped curb the algal proliferation by setting phosphorus limits for any discharges to the Great Lakes. The scientific literature indicates success in this management strategy as measured maximum biomass values decreased. Recent studies, however, show that - while phosphorus limitations are still in effect - Cladophora has returned, and at greater depths. The introduction and establishment of invasive zebra and quagga mussels (Dreissena polymorpha and Dreissena rostriformis bugensis) to the Great Lakes in the late 1980s to early 1990s cause perturbations in the light environment that lead to favorable conditions for Cladophora. This dissertation first investigates the potential drivers of the Cladophora resurgence by comparing historical data and conducting a modeling exercise that - for the first time - quantifies the effect of each driving force on the Cladophora resurgence (Chapter 2). In the spirit of monitoring and analyzing existing data, this section establishes that the Cladophora resurgence is not only perceived but real and that changes in light conditions following the invasion of dreissenids allow for renewed algal proliferation. Chapter 3 of this work describes the development, calibration, and confirmation of a hydrodynamic model, which is applied to describe mass transport in the nearshore of northern Lake Ontario. This work is in response the Great Lakes Water Quality Protocol of 2012, which recognizes that a whole-lake (offshore) approach to controlling nuisance algal growth will not be effective where effluent and tributary discharges are received immediately and locally in the nearshore. Chapter 4 focuses on the development, calibration, and confirmation of the Great Lakes Cladophora Model version 3 (GLCM v3), which includes several improvements of the previous version of the GLCM: redefined light/temperature rate of photosynthesis and respiration response curves, inclusion of a growth-inhibiting self-shading term, a newly defined relationship between the phosphorus uptake rate and stored phosphorus content, replacement of the Droop relationship between the rate of photosynthesis and stored phosphorus content with a similar relationship based on experimental results, and treatment of self-shading and sloughing for an improved understanding and algorithm describing those processes. The GLCM v3 will serve to set a phosphorus standard specific to managing Cladophora, an ecosystem objective that has never been quantitatively defined before.
Download or read book Cladophora Growth in Littoral Environments of Large Lakes written by David Christopher Depew and published by . This book was released on 2009 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis brings together a variety of new and evolving technologies in an attempt to characterize spatial variability in highly complex near shore areas of the Laurentian Great Lakes in order to provide methods and mechanisms of answering ecological questions in the presence of dynamic and heterogeneous environmental conditions. A high frequency echosounder was used to detect and characterize the nuisance macroalgae (Cladophora) that currently blooms along many of the lower Great Lakes shorelines. Detection of algal stands that were of high biomass and therefore likely to be considered a nuisance was largely successful and robust. Detection of short stands and those of low biomass were limited by the acoustic resolution of the system. Attempts to use average backscatter strength and integrated scattering volume as predictive metrics to estimate standing crop were largely unsuccessful, likely due to the inability of completely excluding reverberation from the substrate and the presence of invertebrates within the algal mats. This acoustic system was subsequently used during near shore mobile surveys to map the distrubtion of Cladophora at several locations in Lakes Ontario, Erie and Huron. Cladophora was detected with the acoustic unit at all sites in Lakes Ontario and Erie, including at offshore shoals, far removed from catchment influence. Cladophora was not detected at any of the Lake Huron sites and visual observation combined with underwater camera work confirmed that Cladophora did not accumulate to levels that would be detecable with acoustics, or was absent entirely. Nutrient conditions varied surprisingly little among sites, and did not readily explain the differences in Cladophora distribution from site to site. In contrast, dreissenid mussel abundance was significantly associated with Cladophora biomass, likely due to their effects on water clarity and nutrient regeneration in the benthos. Despite the strong association between dreissenid abundance and Cladophora biomass observed during the multi-lake surveys, urbanized catchments contain a multitude of potential shoreline nutrient sources which may contribute to the current patterns of Cladophora growth. No compelling evidence for nutrient supply from shoreline sources or municipal waste water treatment plants was observed, and although some degree of spatial association between Cladophora growth and tributaries was observed at one of the study sites, the widespread nature of Cladophora growth in conjunction with a lack of nutrient enrichment evidence argues against shoreline sources as a significant cause. Although much of the spatial variation of water masses and phytoplankton in the near shore is structured by hydrodynamic processes, some evidence exists that the extensive beds of Cladophora may have some ability to affect the overlying water chemistry and water quality. Patterns of dissolved gases in the near shore were largely consistent with the demand for CO2 and the release of O2 by Cladophora in the summer months when biomass and areal cover were high. Furthermore, changes in phytoplankton photosynthetic efficiency were consistent with changes in nutrient and CO2 levels, suggesting that perhaps the interplay between benthic algae and pelagic phytoplankton may be important in the shallow waters. Although Cladophora is a major component of the lower Great Lakes benthic community, it does not reach comparable levels in Lake Simcoe despite comparable water clarity, phosphorus concentrations and dreissenid mussel abundance to the lower Great Lakes. The difference in physical size between Lake Simcoe and the Great Lakes may partly explain the relative lack of Cladophora growth in Lake Simcoe, perhaps through reduced turbulence or reduced physical disturbance that allows for invertebrate grazers to maintain high abundances relative to the Great Lakes where mussel shells are pulverized to fine grained material that eliminates invertebrate refuge. Differences in water chemistry may also be important; dissolved silica concentrations in Lake Simcoe are comparable to those measured in the upper Great Lakes and do not drop below the threshold for silica limitation of phytoplankton or benthic algae. This may prevent Cladophora from outgrowing its epiphyte coating, leaving Cladophora in a state of nearly continuous light limitation. Although Cladophora did not respond in Lake Simcoe as it did in the lower Great Lakes to dreissenid invasion, macrophyte growth has clearly increased. Macrophyte growth covered nearly 100% of Cook's Bay to a depth of 8 m, and macrophytes were observed at depths of up to 10 m. It appears that while historical nutrient loading as provided the nutrient rich sediment in Cook's Bay, dreissenids have supplied the significant increase in water clarity, that has allow for the expansion of macrophytes into deeper water.
Download or read book Cladophora in the Great Lakes written by Harvey Shear and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cladophora Modeling in the Great Lakes written by Qin Ji and published by . This book was released on 2011 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is the first step towards development of a nearshore ecosystem model that could be used to support management of nearshore areas with respect to water quality problems, in particular Cladophora. The specific goal is to couple a hydrodynamic and a Cladophora model, and apply and test the coupled model for a nearshore region in Lake Ontario, in connection with the Lake Ontario Nearshore Nutrient Study (LONNS). Through sensitivity analyses under shallow and deep water conditions and other comparisons of the Cladophora Growth Model (CGM) from Higgins and the Great Lakes Cladophora Model (GLCM) from Tomlinson et al., the GLCM was selected because it is simpler and more stable. Spatial resolutions of attached and sloughed Cladophora biomass on the Oak Orchard nested region of Lake Ontario were obtained by coupling the Princeton Ocean Model (POM) to GLCM. The results show that Cladophora was concentrated along a width of approximately 1 km off the coast (water depth 0-10 m) and the highest attached and sloughed biomass for each nested grid were both achieved on the 191st Julian day in year 2008. A particle tracking model (PTM) was later combined with these two models and was used to predict the sloughed biomass transport pattern (forward PTM) and simulate the potential source region of the sloughed biomass observed on the beach (backward PTM). Modeling results show that more than 50% of the sloughed Cladophora crashed on the nearest beach within 12 hours after sloughing and the potential source region of the sloughed Cladophora on the beach is the nearest nearshore region.
Download or read book Modeling the Growth Dynamics of Cladophora in Eastern Lake Erie electronic Resource written by Scott Neil Higgins and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cladophora glomerata is a filamentous green alga that currently forms extensive blooms in nearshore areas of Lake Ontario, eastern Lake Erie, Lake Michigan, and isolated locations in Lake Huron. The biomass, areal coverage, algal bed characteristics, and tissue phosphorus concentrations of Cladophora glomerata were measured at 24 nearshore rocky sites along the northern shoreline of Lake Erie's eastern basin between 1995-2002. Midsummer areal coverage at shallow depths ([lto]5m) ranged from 4-100 %, with a median value of 96%. Peak seasonal biomass ranged from
Download or read book Cladophora Distribution in Lake Ontario IFYGL written by C. T. Wezernak and published by . This book was released on 1974 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multispectral remote sensing data were collected along the U.S. shoreline of Lake Ontario, under the sponsorship of the Environmental Protection Agency, as part of the International Field Year on the Great Lakes (IFYGL) program in Lake Ontario. Data were processed to show the distribution of Cladophora in the nearshore zone and to estimated the standing crop. The results show an extensive growth and development of Cladophora in the study area. Approximately 66% of the nearshore zone in the western portion of the lake and 79% in the eastern portion is covered by Cladophora. -- Abstract.
Download or read book Cladophora in the Great Lakes written by John H. Neil and published by . This book was released on 1974 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report of the Great Lakes Research Division University of Michigan written by University of Michigan. Great Lakes Research Division and published by . This book was released on 1986 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MODELING CANOPY EFFECT IN THE GREAT LAKES CLADOPHORA MODEL written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Cladophora glomerata is a filamentous green alga native to the Great Lakes. However, its nuisance growth in phosphorus rich waters negatively affects the lakes' aesthetic and water quality. The Great Lakes Cladophora Model (GLCM) v1, developed in 1982, was the first mechanistic model to simulate Cladophora growth basing phosphorus availability and environmental conditions followed by Cladophora Growth Model and GLCM v2. In this study, the light and temperature mediation factors for Cladophora net growth are revised as a necessary step prior to the development of a self-shading algorithm. The concept of a fixed-value, maximum achievable biomass (carrying capacity) employed in the previous models is replaced by an approach where the maximum realized biomass is determined mechanistically. The canopy (self-shading) algorithm, incorporated in the GLCM framework, models the effects of light attenuation within the algal mat on the net biomass production of Cladophora. The resultant GLCM v3 is more mechanistic and eliminates the need of an overly deterministic carrying capacity term.
Download or read book Publication Great Lakes Research Division written by University of Michigan. Great Lakes Research Division and published by . This book was released on 1960 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Great Lakes and Their Problems written by University of Toronto. Great Lakes Institute and published by . This book was released on 1965 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
