• Login
    View Item 
    •   Home
    • University Colleges
    • SUNY Brockport
    • Scholarship
    • Technical Reports (Water Resources)
    • View Item
    •   Home
    • University Colleges
    • SUNY Brockport
    • Scholarship
    • Technical Reports (Water Resources)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of SUNY Open Access RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsDepartmentThis CollectionPublication DateAuthorsTitlesSubjectsDepartmentAuthor ProfilesView

    My Account

    LoginRegister

    Campus Communities in SOAR

    Alfred State CollegeBrockportBroomeCantonDownstateEmpireFredoniaMaritimeNew PaltzOneontaOptometryOswegoPlattsburghSUNY Polytechnic InstituteSUNY Office of Community Colleges and the Education PipelineSUNY PressUpstate Medical

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Epilimnetic Phytoplankton and Zooplankton Biomass and Species Composition In Lake Ontario, 1986 to 1992.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    tech_rep/12/fulltext (1).pdf
    Size:
    916.0Kb
    Format:
    PDF
    Download
    Average rating
     
       votes
    Cast your vote
    You can rate an item by clicking the amount of stars they wish to award to this item. When enough users have cast their vote on this item, the average rating will also be shown.
    Star rating
     
    Your vote was cast
    Thank you for your feedback
    Author
    Makarewicz, Joseph C.
    Lewis, Theodore W.
    Bertram, Paul
    Keyword
    Lake Ontario
    Phytoplankton And Zooplankton Biomass And Abundance
    Historical Trends
    Eutrophication Trends
    Food Web Changes.
    Date Published
    1995-07-01
    
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/20.500.12648/4332
    Abstract
    Results of the Food Web Workshop II (Hartig et al. 1991) indicated that Lake Ontario may be the next Great Lake after Lake Michigan to demonstrate the effects of changing nutrient levels and food web controls. Total phosphorus loads into the lake declined by 80% since 1972 and have approached the target loading set by the Great Lakes Water Quality Agreements between the United States and Canada. Spring total phosphorus levels declined from 25 to 14 IlglL between 1971 and the late 1980s and are currently below 10 Ilg/L. Although declines in chlorophyll-a were relatively low and transparency has not changed appreciably, there is some evidence that algal biomass has declined. Besides changes in nutrient concentrations, changes in fish abundance has occurred as alewife, slimy sculpin and smelt biomass have decreased, while stocking of coho and chinook salmon increased from 40,000 to 5.4 million from 1968 to 1984 (Hartig et al.. 1991). In 1993, the rate of salmonine stocking was reduced (Luckey 1994). These changes in nutrient status and in the food web of the lake, and the potential for further appreciable change in the biota of Lake Ontario, have directed attention to the long-term data sets of phytoplankton and zooplankton collected by the Great Lakes National Program Office of the U. S. Environmental Protection Agency as indicators of quantitative and compositional changes in plankton community structure. Phytoplankton, which have short carbon turnover rates, are sensitive to water quality conditions and to grazing by zooplankton and thus respond rapidly to perturbations of the lake ecosystem. The determination of phytoplankton abundance and species composition is one method to trace long-term changes in lakes (Munawar and Munawar 1982, Makarewicz 1993, Makarewicz and Bertram 1991). Similarly, whether aquatic ecosystems are perturbed by changes in the top predator fish that 2 cascade down the food web or by nutrients or by other stressors that are expressed from the first trophic level upward, the zooplankton are sensitive integrators of such changes (McNaught and Buzzard 1973). They have also proved useful for complementing phytoplankton data to assess the effects of water quality (Gannon and Sternberger 1978) and fish populations on biota (e.g. Brooks and Dodson 1965). The phytoplankton and zooplankton data sets collected by EPA's Great Lakes National Program Office provide such information and support the International J oint Commission's call for more and better information through monitoring and research on components of the Lake Ontario food web (Hartig et al. 1991). In this study, data about the 1986-92 spring and summer phytoplankton and zooplankton assemblages make it possible to examine the historical, geographic, and seasonal relationships prevailing in Lake Ontario and to compare them, where possible, to previous studies.
    Description
    DISCLAIMER: This report has been reviewed by the Great Lakes National Program Office, U.S. Environmental Protection Agency, and approved for publication. Approval does not signify that the contents necessarily reflect the views and policies of the U.S. Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.
    Collections
    Technical Reports (Water Resources)

    entitlement

     

    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.