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Longitudinal Distribution and Ecophysiological Characteristics of Hydropsyche exocellata (Trichoptera: Hydropsychidae) in Large Rivers

Bruno Guinand, Henri Tachet and Chantal Roux
Ecography
Vol. 17, No. 2 (Jun., 1994), pp. 189-197
Published by: Wiley on behalf of Nordic Society Oikos
Stable URL: http://www.jstor.org/stable/3682951
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Longitudinal Distribution and Ecophysiological Characteristics of Hydropsyche exocellata (Trichoptera: Hydropsychidae) in Large Rivers
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Abstract

The position as a potamic or rhithronic species of Hydropsyche exocellata (Trichoptera: Hydropsychinae) was analysed with regard to: i) its metabolism temperature curve and the total amplitude of its respiratory metabolism between 5° and 25°C, ii) its distribution in some reaches of the Rhône River basin (France), and Hydropsychinae coexisting species in those reaches to assess its place in the stream continuum. Metabolism data indicated clearly that H. exocellata was a species adapted to the potamon, but distribution data did not confirm metabolism results. The absence of H. exocellata, for instance, from the lower and potamic reaches from the Rhône River itself, as well as its frequent coexistence with H. pellucidula, a well-established near-rhithronic species regarding metabolism, suggests a more complex definition of its position as a potamic species.

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