Author(s): Nakamura Y, Turner JT
Feeding on natural plankton populations and respiration of the small cyclopoid copepod Oithona similis were measured during the warm season in Buzzards Bay, Massachusetts, USA. Although O.similis did not significantly ingest small autotrophic and heterotrophic flagellates (2–8 μn), this copepod actively fed on >10 μm particles, including autotrophic/heterotrophic (dino)flagel-lates and ciliates, with clearance rates of 0.03–0.38 ml animal−1 h−1. The clearance rates increased with the prey size. O.similis also fed on copepod nauplii (mainly composed of the N1 stage of Acartia tonsa with a clearance rate of 0.16 ml animal−1 h−1. Daily carbon ration from the combination of these food items averaged 148 ng C animal−1 day−1 (41% of body C day−1), with ciliates and heterotrophic dino-flagellates being the main food source (˜69% of total carbon ration). Respiration rates were 020–0.23 μl O2 animal−1 day−1. Assuming a respiratory quotient of 0.8 and digestion efficiency of 0.7, the carbon requirement for respiration was calculated to be 125–143 ng C animal−1 day−1, close to the daily carbon ration estimated above. We conclude that predation on ciliates and heterotrophic dinoflagellates was important for O.similis to sustain its population in our study area during the warm season.
Referred From: https://academic.oup.com/plankt/article/19/9/1275/1524404
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