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    Effects of crowding on growth rate and symbiosis in green hydra

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    Thorp_1975.pdf (2.508Mb)
    Issue Date
    1975-01-01
    Author
    Thorp, James H.
    Barthalamus, George T.
    Publisher
    Ecological Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    In order to examine the relationship between crowding and growth rate in green hydra (Hydra viridis), we raised animals at various levels of fixed population densities; all new individuals in excess of the fixed densities were counted and removed every 4 days. A significant inverse relationship between population density and population growth rate exists. In addition, hydras were found to increase or decrease their growth rates in response to rapid changes of density after acclimation to fixed densities. The most dramatic effects were noted when the changes in degrees of crowding were greatest. Investigation of the effects of crowding in hydras on the total quantity of algal endosymbionts and their pigments revealed no significant changes in algal numbers or in carotenoid to chlorophyll-tf ratios at any level of crowding. Data on the presence of a water borne inhibitor of asexual reproduction supported the hypothesis that crowded culture medium contains a substance which depresses growth rates in green hydras.
    URI
    http://hdl.handle.net/1808/17618
    DOI
    https://doi.org/10.2307/1935313
    Collections
    • Center for East Asian Studies Scholarly Works [354]
    • Ecology & Evolutionary Biology Scholarly Works [1497]
    Citation
    Thorp, James H.; Barthalamus, George T. (1975). "Effects of crowding on growth rate and symbiosis in green hydra." Ecology, 56(1):206-212. http://www.dx.doi.org/10.2307/1935313.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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