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    Effects of Microhabitat Selection on Feeding Rates of Net-Spinning Caddisfly Larvae

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    Thorp_1992.pdf (5.671Mb)
    Issue Date
    1992-02-01
    Author
    Georgian, Ted
    Thorp, James H.
    Publisher
    Ecological Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    Copyright by the Ecological Society of America
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    Abstract
    Net-spinning caddisfly larvae of the family Hydropsychidae are known to prefer microhabitats with large, stable substrate and high water flow velocity. It is often assumed that net spinners in high-velocity microhabitats have higher feeding or growth rates than larvae in less preferred sites, but there is no direct evidence to support this assumption. We hypothesized that net-spinning caddisflies would select microhabitats that offered the greatest feeding rates. This hypothesis was tested by field experiments in which we determined if net-spinning caddisfly larvae preferred high-velocity sites even when substrate size and type were held constant. We then measured feeding rates of net spinners in microhabitats with different flow characteristics. High-flow positions were selected by 96% of hydropsychid larvae colonizing artificial moss substrates. Artemia nauplii released into the water column were captured by individual larvae in high-flow sites at a rate of 0.016%/m, significantly higher than the capture rate in low-flow sites. Combining this rate of prey capture with mean hydropsychid densities of 1125 individuals/m2, we estimate that hydropsychid larvae in riffles remove drifting invertebrate prey at a rate of «18%/m. Assuming exponential prey removal, a prey item in the drift would travel an average of only 5.5 m before being consumed. This study is one of the first to show that the distribution of a stream filter feeder is related to the feeding rates obtainable in different microhabitats.
    URI
    http://hdl.handle.net/1808/17619
    DOI
    https://doi.org/10.2307/1938734
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Georgian, Ted; Thorp, James H. (1992). "Effects of Microhabitat Selection on Feeding Rates of Net-Spinning Caddisfly Larvae." Ecology, 73(1):229-240. http://www.dx.doi.org/10.2307/1938734.

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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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