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Egg production and associated losses of carbon, nitrogen and fatty acids from maternal biomass in Calanus finmarchicus before the spring bloom

Egg production and associated losses of carbon, nitrogen and fatty acids from maternal biomass in Calanus finmarchicus before the spring bloom
Egg production and associated losses of carbon, nitrogen and fatty acids from maternal biomass in Calanus finmarchicus before the spring bloom
We present concurrent data on ingestion, egg production and the loss of maternal biomass in pre-spring bloom female Calanus finmarchicus incubated under conditions representative of those in situ in the North Atlantic. A balanced metabolic budget was constructed and used to examine the relative importance of ingestion and biomass for fuelling egg production during the incubations. Ingested carbon was not sufficient to meet the observed demands for egg production. More than 80% of the carbon utilised by the females was instead derived from their biomass. Fatty acid analysis demonstrated that the storage reserves, 20:1 (n?9) and 22:1 (n?11), were virtually absent before experimentation began, and therefore could not have been used to supply the carbon required for egg production during the incubations. The C:N mass-specific ratio of the biomass utilised was 4.1, suggesting that the females had instead catabolised protein in order to meet their metabolic demands. These results suggest that C. finmarchicus adopts a sacrificial reproductive strategy when food availability is low.
0924-7963
505-510
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) Egg production and associated losses of carbon, nitrogen and fatty acids from maternal biomass in Calanus finmarchicus before the spring bloom. Journal of Marine Systems, 78 (4), 505-510. (doi:10.1016/j.jmarsys.2008.12.019).

Record type: Article

Abstract

We present concurrent data on ingestion, egg production and the loss of maternal biomass in pre-spring bloom female Calanus finmarchicus incubated under conditions representative of those in situ in the North Atlantic. A balanced metabolic budget was constructed and used to examine the relative importance of ingestion and biomass for fuelling egg production during the incubations. Ingested carbon was not sufficient to meet the observed demands for egg production. More than 80% of the carbon utilised by the females was instead derived from their biomass. Fatty acid analysis demonstrated that the storage reserves, 20:1 (n?9) and 22:1 (n?11), were virtually absent before experimentation began, and therefore could not have been used to supply the carbon required for egg production during the incubations. The C:N mass-specific ratio of the biomass utilised was 4.1, suggesting that the females had instead catabolised protein in order to meet their metabolic demands. These results suggest that C. finmarchicus adopts a sacrificial reproductive strategy when food availability is low.

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Published date: November 2009

Identifiers

Local EPrints ID: 69195
URI: http://eprints.soton.ac.uk/id/eprint/69195
ISSN: 0924-7963
PURE UUID: 01ea3ce3-bdde-4af8-911a-b093f8d195f5

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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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