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Feeding and egg production of Oithona similis in the North Atlantic

Feeding and egg production of Oithona similis in the North Atlantic
Feeding and egg production of Oithona similis in the North Atlantic
Although cyclopoids of the genus Oithona are considered the most abundant copepods in the marine environment, there is still very little information about what sustains their population and almost constant reproduction rate throughout the year. Feeding and egg production rate (EPR) of O. similis were measured at coastal and oceanic stations during 3 cruises in the North Atlantic between April and November 2002. O. similis ingested ciliates preferentially to other components of the nano- and microplankton (herein nano-microplankton), which only became a more important component of the copepod diet when the abundance of the former decreased to low concentrations. EPR did not show significant seasonal differences, with 2.13 ± 0.67 eggs female–1 d–1 in spring, 1.61 ± 0.32 eggs female–1 d–1 in summer and 1.60 ± 0.15 eggs female–1 d–1 in winter. The ingestion rates measured at many oceanic stations and in winter were often too low to sustain EPR. Egg production efficiency (GGE) >100% indicated that sustained EPR might have relied, particularly in winter, on alternative food sources such as a more carnivorous diet and/or on the faecal pellets of euphausids.
Oithona similis, cyclopoids, feeding rate, egg production rate, microzooplankton, ·gross growth efficiency
0171-8630
173-182
Castellani, C.
d072ee09-3ed4-47c1-a9a2-8143fd00dfc9
Irigoien, X.
25aa155a-3d8c-4ea8-a7c4-7f7be79b5efa
Harris, R.P.
a507befb-c320-4af6-a48c-41ce48ca9e70
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Castellani, C.
d072ee09-3ed4-47c1-a9a2-8143fd00dfc9
Irigoien, X.
25aa155a-3d8c-4ea8-a7c4-7f7be79b5efa
Harris, R.P.
a507befb-c320-4af6-a48c-41ce48ca9e70
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad

Castellani, C., Irigoien, X., Harris, R.P. and Lampitt, R.S. (2005) Feeding and egg production of Oithona similis in the North Atlantic. Marine Ecology Progress Series, 288, 173-182. (doi:10.3354/meps288173).

Record type: Article

Abstract

Although cyclopoids of the genus Oithona are considered the most abundant copepods in the marine environment, there is still very little information about what sustains their population and almost constant reproduction rate throughout the year. Feeding and egg production rate (EPR) of O. similis were measured at coastal and oceanic stations during 3 cruises in the North Atlantic between April and November 2002. O. similis ingested ciliates preferentially to other components of the nano- and microplankton (herein nano-microplankton), which only became a more important component of the copepod diet when the abundance of the former decreased to low concentrations. EPR did not show significant seasonal differences, with 2.13 ± 0.67 eggs female–1 d–1 in spring, 1.61 ± 0.32 eggs female–1 d–1 in summer and 1.60 ± 0.15 eggs female–1 d–1 in winter. The ingestion rates measured at many oceanic stations and in winter were often too low to sustain EPR. Egg production efficiency (GGE) >100% indicated that sustained EPR might have relied, particularly in winter, on alternative food sources such as a more carnivorous diet and/or on the faecal pellets of euphausids.

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More information

Published date: 2005
Keywords: Oithona similis, cyclopoids, feeding rate, egg production rate, microzooplankton, ·gross growth efficiency

Identifiers

Local EPrints ID: 15760
URI: https://eprints.soton.ac.uk/id/eprint/15760
ISSN: 0171-8630
PURE UUID: 8fc3b0bb-daea-4813-8dbd-f47ea59e5ae5

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Date deposited: 31 May 2005
Last modified: 17 Jul 2017 16:47

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Contributors

Author: C. Castellani
Author: X. Irigoien
Author: R.P. Harris
Author: R.S. Lampitt

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