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Feeding ecology ofLeitoscoloplos fragilis

II. Effects of worm density on benthic diatom production

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Abstract

The present study examines the effects of density ofLeitoscoloplos fragilis and of fine sediment on benthic microalgal abundance and production in laboratory microcosms, and the effects of fine sediment on diffusive transport of ammonia. Microcosms having different densities ofLeitoscoloplos fragilis (Verrill, 1873) were determined in sediment collected from one of two field stations (each containing a different amount of fine particles <125 μm) from Cape Henlopen, Delaware, USA, in August 1986. The worms were acclimated in a recirculating seawater system for two months prior to experiments. Chlorophylla concentrations were highest in sediments with less fine particles (<125 μm). Benthic diatom production, total microbenthic metabolic activity, and concentrations of pore-water ammonia were higher in sediment microcosms containing high densities of worms.L. fragilis grew more in microcosms containing less fine particles and higher worm densities. The upward flux of ammonia across the sediment-water interface was higher in sediments with less fine particles. A greater abundance of fine particles in these sediments impedes the upward flux of ammonia to surface and nearsurface diatoms. The coupling between population density and diatom production, which can be altered by fine-particle abundance could control the distribution and stability of populations ofL. fragilis.

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  1. T. S. Bianchi

    Present address: Institute of Ecosystem Studies, New York Botanical Garden, Box AB, 12545, Millbrook, New York, USA

Authors and Affiliations

  1. Chesapeake Biological Laboratory, University of Maryland, 20688-0038, Solomons, Maryland, USA

    T. S. Bianchi & D. L. Rice

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  1. T. S. Bianchi
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  2. D. L. Rice
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Communicated by J. M. Lawrence, Tampa

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Bianchi, T.S., Rice, D.L. Feeding ecology ofLeitoscoloplos fragilis . Mar. Biol. 99, 123–131 (1988). https://doi.org/10.1007/BF00644986

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