Zooplankton Feeding Ecology: Contents of Fecal Pellets of the Cyclopoid Copepods Oncaea venusta, Corycaeus amazonicus, Oithona plumifera, and O. simplex from the Northern Gulf of Mexico

Jefferson T. Turner

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Zooplankton Feeding Ecology: Contents of Fecal Pellets of the Cyclopoid Copepods Oncaea venusta, Corycaeus amazonicus, Oithona plumifera, and O. simplex from the Northern Gulf of Mexico

机译：Zooplankton Feeding Ecology: Contents of Fecal Pellets of the Cyclopoid Copepods Oncaea venusta, Corycaeus amazonicus, Oithona plumifera, and O. simplex from the Northern Gulf of Mexico

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Abstract.In situfeeding habits of the cyclopoid copepodsOncaea venusta, Corycaeus amazonicus, Oithona plumifera, andO. simplexwere investigated by scanning electron microscope examination of fecal pellets, the contents of which reflected copepod gut contents upon capture. Peilet contents were compared with assemblages of phytoplankton present in surface waters at times of copepod collection. All samples were from the northern Gulf of Mexico. All four copepods fed upon phytoplankton andO. venustaalso ingested other crustaceans. Dominant components of fecal pellets generally did not mirror those of available phytoplankton assemblages. In some cases,O. venustaingested primarily larger‐sized particles even when these were not most abundant, and in other cases it did not ingest large cells even when they were present in bloom concentrations. The presence of small (<2–5 urn diameter) centric diatoms inO. venustapellets suggests the possibility of feeding by mechanisms other than suspension or raptorial feeding. Limited observations suggest thatC. amazonicusandO. plumiferamay feed raptorially on larger particles even when these are not particularly abundant, and that the smallO. simplex(<500 nm total length) feeds mainly upon nanoplankton. It appears that cyclopoid feeding mechanisms are complex, and likely more so than those of many calano

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《marine ecology》 |1986年第4期|289-302|共页
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Jefferson T. Turner;
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正文语种英语
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Zooplankton; Copepoda; Oncaea venusta; Corycaeus amazonicus; Oithona plumifera; Oithona simplex feeding; fecal pellets; SEM; Ultra‐Ecology; Gulf of Mexico;

Zooplankton Feeding Ecology: Contents of Fecal Pellets of the Cyclopoid Copepods Oncaea venusta, Corycaeus amazonicus, Oithona plumifera, and O. simplex from the Northern Gulf of Mexico

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