Feeding selectivities and food niche separation of Acartia clausi, Penilia avirostris (Crustacea) and Doliolum denticulatum (Thaliacea) in Blanes Bay (Catalan Sea, NW Mediterranean)

Selectivity-size spectra, clearance and ingestion rates and assimilation efficiencies of Acartia clausi (Copepoda), Penilia avirostris (Cladocera) and Doliolum denticulatum (Doliolida) from Blanes Bay (Catalan Sea, NW Mediterranean) were evaluated in grazing experiments over a wide range of food con...

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Bibliographic Details
Published in:Journal of plankton research 2004-06, Vol.26 (6), p.589-603
Main Authors: Katechakis, Alexis, Stibor, Herwig, Sommer, Ulrich, Hansen, Thomas
Format: Article
Language:English
Subjects:
Acartia clausi
Algae
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Aquatic crustaceans
Autoecology
Bays
Biological and medical sciences
Coefficients
Coexistence
Crustacea
Doliolum denticulatum
Feeding
Feeding behavior
Food
Food selection
Fundamental and applied biological sciences. Psychology
Grazing
Ingestion
Mesocosms
Niches
Nutrient enrichment
Nutrients (mineral)
Penilia avirostris
Plankton
Protozoa. Invertebrata
Separation
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Summary:Selectivity-size spectra, clearance and ingestion rates and assimilation efficiencies of Acartia clausi (Copepoda), Penilia avirostris (Cladocera) and Doliolum denticulatum (Doliolida) from Blanes Bay (Catalan Sea, NW Mediterranean) were evaluated in grazing experiments over a wide range of food concentrations (0.02–8.8 mm3 L−1 plankton assemblages from Blanes Bay, grown in mesocosms at different nutrient levels). Acartia clausi reached the highest grazing coefficients for large algae >70 μm (longest linear extension), P. avirostris for intermediate food sizes between 15 and 70 μm, and D. denticulatum for small sizes from 2.5 to 15 μm. Penilia avirostris and D. denticulatum acted as passive filter-feeders. Acartia clausi gave some evidence for a supplementary raptorial feeding mode. Effective food concentration (EFC) decreased linearly with increasing nutrient enrichment for D. denticulatum and followed domed curves for A. clausi and for P. avirostris with maximum values at intermediate and high enrichment levels, respectively. Clearance rates of crustacean species showed curvilinear responses with narrow modal ranges to increasing food concentration. Clearance rates of D. denticulatum increased abruptly and levelled into a plateau at low food concentrations. Mean clearance rates were 13.9, 25.5 and 64.1 mL ind.−1 day−1, respectively. No clearance could be detected for A. clausi at food concentrations
ISSN:0142-7873
1464-3774
1464-3774
DOI:10.1093/plankt/fbh062