Relationships between fecal pellet production and feeding in the calanoid copepod Boeckella |
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Authors: | Haney James F; Trout Margaret A |
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Institution: | Department of Zoology, University of New Hampshire, Spaulding Life Science Building Durham, NH 03824, USA |
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Abstract: | The number, size (mm3 pellet 1) and total volume of fecalpellets produced (mm3 h1) by Boeckella titicacae increasedwith concentration of Chlorella and natural seston in threedifferent lakewaters from Bahia de Puno and Lago Grande of LakeTiticaca and nearby Laguna Arapa. The three lakewaters differedin the size and number of fecal pellets produced at seston concentrations>0.5 mg dry wt l1. However, the total volume of fecalpellets egested varied little. Large-sized food (>10 µg)resulted in larger pellets but smaller total fecal production.Food concentration had parallel effects on the production offeces and on feeding rates. Both fecal production and feedingincreased linearly with food concentration with saturation between5 and 7.5 x 105 Chlorella ml1 (3.75.6 mg dry wtl1). Varied responses in fecal production when fed differentsize fractions of lake seston suggest Boeckella has a complexand flexible feeding behavior. Feeding preferences of B.titicacaeand B.occidentalis (Ivlev index) for two seston size fractionsare generally reflected by fecal production. |
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