Accessibility navigation


Seston capture by Hydropsyche siltalai and the accuracy of capture efficiency estimates

Brown, S. A., Ruxton, G. D., Pickup, R. W. and Humphries, S. (2005) Seston capture by Hydropsyche siltalai and the accuracy of capture efficiency estimates. Freshwater Biology, 50 (1). pp. 113-126. ISSN 0046-5070

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1111/j.1365-2427.2004.01311.x

Abstract/Summary

1. Suspension feeding by caseless caddisfly larvae (Trichoptera) constitutes a major pathway for energy flow, and strongly influences productivity, in streams and rivers. 2. Consideration of the impact of these animals on lotic ecosystems has been strongly influenced by a single study investigating the efficiency of particle capture of nets built by one species of hydropsychid caddisfly. 3. Using water sampling techniques at appropriate spatial scales, and taking greater consideration of local hydrodynamics than previously, we examined the size-frequency distribution of particles captured by the nets of Hydropsyche siltalai. Our results confirm that capture nets are selective in terms of particle size, and in addition suggest that this selectivity is for particles likely to provide the most energy. 4. By incorporating estimates of flow diversion around the nets of caseless caddisfly larvae, we show that capture efficiency (CE) is considerably higher than previously estimated, and conclude that more consideration of local hydrodynamics is needed to evaluate the efficiency of particle capture. 5. We use our results to postulate a mechanistic explanation for a recent example of interspecific facilitation, whereby a reduction of near-bed velocities seen in single species monocultures leads to increased capture rates and local depletion of seston within the region of reduced velocity.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Biological Sciences
ID Code:10287
Uncontrolled Keywords:capture efficiency, particle size, seston, suspension feeding, Trichoptera, NET-SPINNING CADDISFLIES, RECTANGULAR-MESH NETS, PARTICLE CAPTURE, SUSPENSION-FEEDERS, LARVAE TRICHOPTERA, CURRENT SPEED, STREAM, MODEL, DIFFERENTIATION, MECHANISMS

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation