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Author: Richard Dennis Olsen
Publisher:
ISBN:
Category : Freshwater phytoplankton
Languages : en
Pages : 640
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Book Description
Author: Richard Dennis Olsen
Publisher:
ISBN:
Category : Freshwater phytoplankton
Languages : en
Pages : 640
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Book Description
Author: Richard Dennis Olsen
Publisher:
ISBN:
Category :
Languages : en
Pages : 321
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Book Description
Author: Cathryn Lawrence Rhodes
Publisher:
ISBN:
Category : Cyanobacteria
Languages : en
Pages : 416
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Book Description
Author: Tyler R. Sawyer
Publisher:
ISBN:
Category : Freshwater plankton
Languages : en
Pages : 91
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Book Description
In 2010, a monthly sampling regimen was established to examine ecological differences in Saguaro Lake and Lake Pleasant, two central Arizona reservoirs. Lake Pleasant is relatively deep and clear, while Saguaro Lake is relatively shallow and turbid. Preliminary results indicated that phytoplankton biomass was greater by an order of magnitude in Saguaro Lake, and that community structure differed. The purpose of this investigation was to determine why the reservoirs are different, and focused on physical characteristics of the water column, nutrient concentration, community structure of phytoplankton and zooplankton, and trophic cascades induced by fish populations. I formulated the following hypotheses: 1) Top-down control varies between the two reservoirs. The presence of piscivore fish in Lake Pleasant results in high grazer and low primary producer biomass through trophic cascades. Conversely, Saguaro Lake is controlled from the bottom-up. This hypothesis was tested through monthly analysis of zooplankton and phytoplankton communities in each reservoir. Analyses of the nutritional value of phytoplankton and DNA based molecular prey preference of zooplankton provided insight on trophic interactions between phytoplankton and zooplankton. Data from the Arizona Game and Fish Department (AZGFD) provided information on the fish communities of the two reservoirs. 2) Nutrient loads differ for each reservoir. Greater nutrient concentrations yield greater primary producer biomass; I hypothesize that Saguaro Lake is more eutrophic, while Lake Pleasant is more oligotrophic. Lake Pleasant had a larger zooplankton abundance and biomass, a larger piscivore fish community, and smaller phytoplankton abundance compared to Saguaro Lake. Thus, I conclude that Lake Pleasant was controlled top-down by the large piscivore fish population and Saguaro Lake was controlled from the bottom-up by the nutrient load in the reservoir. Hypothesis 2 stated that Saguaro Lake contains more nutrients than Lake Pleasant. However, Lake Pleasant had higher concentrations of dissolved nitrogen and phosphorus than Saguaro Lake. Additionally, an extended period of low dissolved N:P ratios in Saguaro Lake indicated N limitation, favoring dominance of N-fixing filamentous cyanobacteria in the phytoplankton community in that reservoir.
Author: Nico Salmaso
Publisher: Springer
ISBN: 9400757905
Category : Science
Languages : en
Pages : 380
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Book Description
Phytoplankton responses to human impact at different scales provides a state-of-the-art review of changes in the phytoplankton assemblages determined by human alterations of lakes and rivers. A wide spectrum of case studies describe the effects due to eutrophication and climate change, as well as other impacts connected with watershed management, hydrological alterations and introduction of non-indigenous species. The volume also includes two wide reviews on planktonic coccoid green algae and planktic heterocytous cyanobacteria. This book is addressed to ecologists and scientists involved in phytoplankton ecology and taxonomy. Many case studies provide a sound scientific basis of knowledge for a wise management of water bodies. Previously published in Hydrobiologia, vol. 698, 2012
Author: C. S. Reynolds
Publisher: Cambridge University Press
ISBN: 1139454897
Category : Science
Languages : en
Pages : 437
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Book Description
This important new book by Colin Reynolds covers the adaptations, physiology and population dynamics of phytoplankton communities. It provides basic information on composition, morphology and physiology of the main phyletic groups represented in marine and freshwater systems and in addition reviews recent advances in community ecology.
Author: Cecila M. Conway
Publisher:
ISBN:
Category : Devils Lake (N.D.)
Languages : en
Pages : 324
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Book Description
Author: C. S. Reynolds
Publisher:
ISBN: 9780521237826
Category : Freshwater phytoplankton
Languages : en
Pages : 384
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Book Description
This describes the lifestyles of planktons and their adaptation for living independently of solid surfaces.
Author: Environmental Monitoring and Support Laboratory (Las Vegas, Nev.). Water and Land Quality Branch
Publisher:
ISBN:
Category : Lakes
Languages : en
Pages : 84
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Book Description
Author: J.-P. Descy
Publisher: Springer Science & Business Media
ISBN: 9401726701
Category : Science
Languages : en
Pages : 214
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Book Description
The ecology of potamoplankton has received less attention than lake plankton. These proceedings produce a synthesis of the composition, community structure and dynamics of lotic phytoplankton, which are intuitively submitted to a strong physical control in the flowing environment, perceived as much more `disturbed' than a lake, even than a well-mixed shallow one. It turns out that the boundary between the phytoplankton of rivers and lakes is not as clear-cut as was thought. In particular, most contributions provide arguments emphasizing the prominent role of physical control in both aquatic systems, especially due to the steep light gradient resulting from turbulent mixing in a turbid water column. Similarities and differences between potamoplankton and limnoplankton, largely based on the information gathered by the contributors are discussed in the introductory paper by Reynolds et al.
