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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Judy Reservoir Monitoring Project 2013 Final Report, Robin A. Matthews, Joan Vandersypen
Judy Reservoir Monitoring Project 2013 Final Report, Robin A. Matthews, Joan Vandersypen
Judy Reservoir
The purpose of this study was to identify and count the phytoplankton and measure chlorophyll, total nitrogen, and total phosphorus levels in water samples collected from Judy Reservoir. Water quality and algal data have been collected on a weekly basis since October 2006; annual reports have been sent to the Skagit Public Utility District No. 1 in 2007, 2008, 2010 (January and December), 2011, and 2012. This project ended in 2013; the final chemistry sample was collected May 2, 2013 and the final algae sample was collected November 6, 2013.
Reservoir Management Techniques To Enhance Biological Productivity And Protect Water Quality, Ben Alan Thompson
Reservoir Management Techniques To Enhance Biological Productivity And Protect Water Quality, Ben Alan Thompson
Graduate Theses and Dissertations
Three reservoirs of similar size, watershed land use, and qualitative characteristics in northwest Arkansas, USA were selected to compare the effects of chemical fertilization and pulsed artificial-upwelling on whole-lake productivity, specifically primary production and phytoplankton biomass. Numerous water quality parameters were quantified over a two year period (2011-13) with the goal of understanding how each management technique would stimulate productivity. This experiment was the first step towards a larger goal to ultimately enhance sport fish production. The first year of monitoring occurred in 2011 and served as a control year for the three lakes. Treatments were initiated in two of …
Phytoplankton Life History Events: Resting Stages And Physiological Cell Death, Christine R. Kozik
Phytoplankton Life History Events: Resting Stages And Physiological Cell Death, Christine R. Kozik
Theses and Dissertations
Understanding and predicting changes in phytoplankton populations requires knowledge of key life history processes such as recruitment from benthic resting stages and losses due to sedimentation and cell death. Currently, these processes are poorly understood in freshwater systems. Phytoplankton resting stage and cell death life history events were separately examined in two freshwater systems in Wisconsin, four northern lakes and an urban pond. In the norther lakes, sedimentation and benthic recruitment were examined using sediment and recruitment traps that were sampled weekly over two summers. Sedimentation and benthic recruitment contributed little to changes in standing crop chl a, but rather …
Long-Term (1927-1978) Changes In The Phytoplankton Community Of Lake Michigan At Chicago, R. Baybutt, Joseph Makarewicz
Long-Term (1927-1978) Changes In The Phytoplankton Community Of Lake Michigan At Chicago, R. Baybutt, Joseph Makarewicz
Joseph C Makarewicz
Fifty-one years of phytoplankton data from the South District Water Intake of the Chicago Water Filtration Plant were analyzed to determine changes in the phytoplankton community related to the eutrophication of Lake Michigan. From 1930 to 1940, a net biomass (~100 mg C/m3) indicative of oligotrophic-mesotrophic conditions were implied by the net algal biomass. By 1961 net algal biomass was ~600 mg C/m3-a biomass indicative of a eutrophic lake. Much of the biomass increase is due to Tabellaria, Stephanodiscus tenuis and S. binderanus. Since the early 1970's, there has been a consistent general decrease in algal biomass to levels associated …
Phytoplankton And Zooplankton: In Lakes Erie, Lake Huron And Lake Michigan: 1984, Joseph Makarewicz
Phytoplankton And Zooplankton: In Lakes Erie, Lake Huron And Lake Michigan: 1984, Joseph Makarewicz
Joseph C Makarewicz
With the acknowledgement that biological monitoring was fundamental to charting ecosystem health (Great Lakes Water Quality Agreement 1978), EPA's program was developed for Lakes Erie, Huron and Michigan to: 1) monitor seasonal patterns, ranges of abundance and, in general, structure of the phytoplankton and zooplankton communities; 2) relate the biological components to variations in the physical, nutrient and biological environment; and 3) assess the annual variance to allow better long-term assessments of trophic structure and state. Several offshore stations (9-11) on several cruises (9-11) during the spring, summer and autumn of 1984 and winter of 1985 were sampled. By examining …
Trophic Interactions: Changes In Phytoplankton Community Structure Coinciding With Alewife Introduction (Alosa Pseudoharengus), Joseph Makarewicz
Trophic Interactions: Changes In Phytoplankton Community Structure Coinciding With Alewife Introduction (Alosa Pseudoharengus), Joseph Makarewicz
Joseph C Makarewicz
Conesus Lake is a eutrophic lake (MILLS 1975) and the most western of the Finger Lakes of New York State, USA. Abundance of a top level predator, the walleye (Stizostedion vitreum vitreum), decreased from a high of 12,000 individuals in 1966 to 9,614 individuals in 1975 to 1,850 individuals by 1985 in Conesus Lake (ABRAHAM 1989). Coincidental with the decline of the walleye in Conesus Lake was the proliferation of an obligate planktivore, Alosa pseudoharengus (ABRAHAM 1988). During the late 1970s (probably 1978 or 79), the alewife was accidentally introduced and became established in the lake. The pre-alewife zooplankton community …
Multivariate Analysis Of The Lake Michigan Phytoplankton Community At Chicago, R. Baybutt, Joseph Makarewicz
Multivariate Analysis Of The Lake Michigan Phytoplankton Community At Chicago, R. Baybutt, Joseph Makarewicz
Joseph C Makarewicz
Ordination techniques were used to analyze phytoplankton and water chemistry data collected between 1927 and 1978 from Lake Michigan at Chicago. Ordination analysis summarized the phytoplankton data and illustrated the progression from oligotrophy to eutrophy and the subsequent reversal of cultural eutrophication after 1970 in the nearshore waters of Lake Michigan at Chicago. The analysis highlighted a significant correlation between blue-green algal biomass and Na+ concentration. The increase in mean annual Na+ concentration in Lake Michigan at Chicago and the experimental evidence implying a Na+ requirement for blue-green algae suggested that the increase in blue-greens, although influenced by P enrichment …
Investigations Of Phytoplankton Diversity In Chesapeake Bay, Todd Arthur Egerton
Investigations Of Phytoplankton Diversity In Chesapeake Bay, Todd Arthur Egerton
Biological Sciences Theses & Dissertations
Characterizing the diversity of a community in relation to environmental conditions and ecosystem functions are core concepts in ecology. While decades of research have led to a growing comprehension of diversity in many ecosystems, our understanding in aquatic habitats and microbial organisms remains relatively limited. Phytoplankton represent a diverse and important group that contribute approximately half of global primary productivity and are intrinsically connected to changing environmental conditions, especially in systems as dynamic as estuaries. To better understand the ecological processes governing phytoplankton composition and diversity, spatial and temporal patterns of environmental parameters and their relation to the algal community …
Effects Of Deepwater Horizon Oil On The Growth Rates And Pigment Composition Of Phytoplankton Isolated From Grand Isle, La, Jie Li
LSU Master's Theses
This research focused on the effects of un-weathered Macondo crude oil on the growth rates and pigment ratios of phytoplankton isolated from Grand Isle, LA. The experiments involved incubating nutrient-enriched artificial media containing a range of oil concentrations up to 19.2 ppm with small aliquots of coastal water from Grand Isle and measuring the growth rates of the phytoplankton during the subsequent 10–14 days and the pigment ratios of the phytoplankton at the end of log-phase growth to determine whether the crude oil affected the growth rate of the phytoplankton and their composition in terms of pigment ratios. Pigment analysis …