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Limitation of egg production in Calanus finmarchicus in the field: a stoichiometric analysis

Limitation of egg production in Calanus finmarchicus in the field: a stoichiometric analysis
Limitation of egg production in Calanus finmarchicus in the field: a stoichiometric analysis
The egg production of marine copepods correlates with a range of variables, including the availability of organic carbon (C), nitrogen (N) and the polyunsaturated fatty acids (PUFAs) 20:5(n?3) (EPA) and 22:6(n?3) (DHA). However, an understanding of which substrates limit egg production in the natural environment has yet to be reached. The quantities of C, N, EPA and DHA ingested, derived from parental biomass, and invested in eggs by female Calanus finmarchicus during a 5-day incubation experiment were examined using stoichiometric theory to determine which substrate was limiting. The majority of each substrate was derived from parental biomass, and therefore the existing stoichiometric theory is developed to include this route of supply. The females were essentially devoid of lipid reserves, as evidenced by the lack of the storage fatty acids 20:1(n?9) and 22:1(n?11), and carbon limitation was predicted under most of the scenarios examined. Nitrogen limitation was only apparent when carbon and nitrogen utilisation efficiencies were assumed to be high (0.5) and low (0.4) respectively. PUFAs were assumed to be utilised with high efficiency (0.9), and were never predicted to limit production. This work highlights the need for a more detailed understanding of the maintenance requirements that marine copepods have for C, N, EPA, and DHA and hence the efficiencies with these substrates can be utilised for growth.
0924-7963
511-517
Mayor, Daniel J.
a2a9c29e-ffdc-4858-ad65-3a235824a4c9
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Pond, David W.
3d0d013e-d9e0-4fc3-b30c-12f7f24bec6d
Irigoien, Xabier
82dafcb7-8ca9-49f5-906c-36da504d50ed
Mayor, Daniel J.
a2a9c29e-ffdc-4858-ad65-3a235824a4c9
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Pond, David W.
3d0d013e-d9e0-4fc3-b30c-12f7f24bec6d
Irigoien, Xabier
82dafcb7-8ca9-49f5-906c-36da504d50ed

Mayor, Daniel J., Anderson, Thomas R., Pond, David W. and Irigoien, Xabier (2009) Limitation of egg production in Calanus finmarchicus in the field: a stoichiometric analysis. Journal of Marine Systems, 78 (4), 511-517. (doi:10.1016/j.jmarsys.2008.12.020).

Record type: Article

Abstract

The egg production of marine copepods correlates with a range of variables, including the availability of organic carbon (C), nitrogen (N) and the polyunsaturated fatty acids (PUFAs) 20:5(n?3) (EPA) and 22:6(n?3) (DHA). However, an understanding of which substrates limit egg production in the natural environment has yet to be reached. The quantities of C, N, EPA and DHA ingested, derived from parental biomass, and invested in eggs by female Calanus finmarchicus during a 5-day incubation experiment were examined using stoichiometric theory to determine which substrate was limiting. The majority of each substrate was derived from parental biomass, and therefore the existing stoichiometric theory is developed to include this route of supply. The females were essentially devoid of lipid reserves, as evidenced by the lack of the storage fatty acids 20:1(n?9) and 22:1(n?11), and carbon limitation was predicted under most of the scenarios examined. Nitrogen limitation was only apparent when carbon and nitrogen utilisation efficiencies were assumed to be high (0.5) and low (0.4) respectively. PUFAs were assumed to be utilised with high efficiency (0.9), and were never predicted to limit production. This work highlights the need for a more detailed understanding of the maintenance requirements that marine copepods have for C, N, EPA, and DHA and hence the efficiencies with these substrates can be utilised for growth.

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Published date: November 2009

Identifiers

Local EPrints ID: 69196
URI: http://eprints.soton.ac.uk/id/eprint/69196
ISSN: 0924-7963
PURE UUID: e18f653b-9b6d-465a-9fe1-ecc62c75808b

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Date deposited: 23 Oct 2009
Last modified: 18 Nov 2022 18:35

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Contributors

Author: Daniel J. Mayor
Author: Thomas R. Anderson
Author: David W. Pond
Author: Xabier Irigoien

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