Body size and food size in freshwater zooplankton

• Kenneth G. Bogdan

  Department of Biological Sciences, Dartmouth College, Hanover, NH 03755

• John J. Gilbert

  Department of Biological Sciences, Dartmouth College, Hanover, NH 03755

抄録

We used double-label liquid scintillation techniques to measure the efficiencies with which eight different-sized zooplankton species ingested four cell types relative to a standard cell type ( Chlamydomonas ). Efficiency ratios (ERs: clearance rate on cell type X ÷ clearance rate on Chlamydomonas ) on the three ultraplankton (<5 μm in diameter) cells (a coccoid bacterium and the algae Synechococcus and Nannochloris ) varied greatly among zooplankton species but were not correlated with zooplankton body length. Variation in ERs on a much larger (17 × 14 μm) algal cell ( Cryptomonas ) was only partly explained by zooplankton body length. The eight zooplankton species were classified into three functional groups: ( i ) species having moderate to high ERs on all ultraplankton (0.4 < ER < 1.6) and ERs on Cryptomonas proportional to their body lengths ( Conochilus, Diaphanosoma , and probably Keratella cochlearis and Ceriodaphnia ); ( ii ) species having extremely low ERs on bacteria (mean ER < 0.05), higher but still low ERs on ultraphytoplankton (ER generally < 0.4), and ERs on Cryptomonas proportional to their body lengths ( Bosmina, Diaptomus copepodites and adults); ( iii ) species having extremely low ERs on all ultraplankton (mean ER < 0.05) and ERs on Cryptomonas much higher than expected given their body lengths ( Keratella crassa, Polyarthra , and Diaptomus nauplii). These functional groups follow neither taxonomic nor body-length groupings. We conclude that zooplankton body length may influence the maximal particle size a species can ingest but has little influence on the ingestion of smaller particles. Two frequently used models relating zooplankton body size and food size are unrealistic.

収録刊行物

• Proceedings of the National Academy of Sciences

  Proceedings of the National Academy of Sciences 81 (20), 6427-6431, 1984-10

  Proceedings of the National Academy of Sciences

キーワード

• Multidisciplinary

詳細情報

• CRID: 1360298764979713536
• NII論文ID: 30016276280
• DOI: 10.1073/pnas.81.20.6427
• ISSN: 10916490
• ISSN: 00278424
• Web Site: https://pnas.org/doi/pdf/10.1073/pnas.81.20.6427
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