Fecal pellets from a dense aggregation of suspension-feeders in a stream: An example of ecosystem engineering

6533b82efe1ef96bd129449b

RESEARCH PRODUCT

Fecal pellets from a dense aggregation of suspension-feeders in a stream: An example of ecosystem engineering

Timo Muotka Kristina Larsson Björn Malmqvist Roger S. Wotton

subject

chemistry.chemical_classification Hydrology Pellets Biomass Aquatic Science Biology Oceanography Population density Ecosystem engineer Suspension (chemistry)chemistry Benthic zone Environmental chemistry Organic matter Ecosystem

description

Blackfly larvae (Diptera: Simuliidae) are "allogenic ecosystem engineers" that capture fine particulate and dissolved matter from suspension and egest much larger fecal pellets. We investigated the effects of blackfly larvae on organic matter transport at 25 sites along a small stream that flowed 500 m from a lake to the sea. Blackfly density was high upstream (>6 x 10(5) ind. m(-2)) and the numbers of fecal pellets in suspension rose markedly downstream from the blackfly aggregation. A total of 1.6 x 10(9) fecal pellets (biomass 3.2 kg C d(-1)) were discharged to the sea each day and 8.0 x 10(8) pellets (biomass 1.6 kg C d(-1)) were lost from suspension. Sedimenting pellets were available to the benthic microbial and invertebrate communities.

year	journal	country	edition	language
1998-06-01	Limnology and Oceanography

https://doi.org/10.4319/lo.1998.43.4.0719

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