Gut clearance and pigment destruction in a herbivorous copepod, Acartia tonsa, and the determination of in situ grazing rates |
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Authors: | Kiorboe Thomas; Tiselius Peter T |
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Institution: | Danish Institute for Fisheries and Marine Research Charlottenlund Castle, DK-2920 Charlottenlund, Denmark |
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Abstract: | Gut clearance rates of starving and continuously feeding Acartiatonsa were estimated. During the initial 30 min the rates weresimilar (0.045 and 0.048 min1, respectively; 14°C)but thereafter starving animals expelled the remains of theirgut contents at half the rate (0.019 min1) of fed ones(0.048). Pigment destruction was estimated by (i) incubationexperiments over 34 days, (ii) silica to pigment ratioin algae and faeces and (iii) by gut filling experiments. Theincubations showed that 8% of the ingested pigments were destroyedto nonfluorescent residues during gut passage. The silica topigment ratio method gave an average of 11 % (1 24) destructionand gut-filling experiments showed no systematic differencebetween ingestion measured as gut filling rate (fluorescence)and particle reduction.
1Present address: Kristineberg Marine Biological Station, S-45034 Fiskebäckskil, Sweden |
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