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Science 4 March 2005:
Vol. 307. no. 5714, pp. 1457 - 1459
DOI: 10.1126/science.1107767
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Reports

Nutritional Status and Diet Composition Affect the Value of Diatoms as Copepod Prey

Ruth H. Jones and Kevin J. Flynn*

The role of diatoms as key food for copepods at the base of pelagic food chains has been questioned recently on the grounds of toxicity. We show, using unialgal versus mixed algal diets of different nutritional status (i.e., nitrogen:carbon ratio) fed to Acartia tonsa, that diatoms per se are not toxic but that single-diatom diets are inadequate. Additionally, the nutritional state of the phytoplankton has a profound effect on copepod growth and growth efficiency. The ecological significance of laboratory demonstrations of diatom toxicity needs to be reconsidered.

Institute of Environmental Sustainability, University of Wales, Swansea, SA2 8PP, UK.

* To whom correspondence should be addressed. E-mail: k.j.flynn{at}swansea.ac.uk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Sublethal effects of the toxic dinoflagellate Karenia brevis on marine copepod behavior.
J. H. Cohen, P. A. Tester, and R. B. Forward Jr (2007)
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Effects of the red tide dinoflagellate, Karenia brevis, on grazing and fecundity in the copepod Acartia tonsa.
C. F. Breier and E. J. Buskey (2007)
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Influence of sestonic elemental and essential fatty acid contents in a eutrophic reservoir in Siberia on population growth of Daphnia (longispina group).
M. I. Gladyshev, N. N. Sushchik, O. P. Dubovskaya, O. N. Makhutova, and G. S. Kalachova (2006)
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Life-stage-specific differences in exploitation of food mixtures: diet mixing enhances copepod egg production but not juvenile development.
M. Koski, W. K. Breteler, N. Schogt, S. Gonzalez, and H. H. Jakobsen (2006)
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Reply to Horizons Article 'Plankton functional type modelling: running before we can walk' Anderson (2005): II. Putting trophic functionality into plankton functional types.
K. J. Flynn (2006)
J. Plankton Res. 28, 873-875
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Variation in hatching success and egg production of Eurytemora affinis (Calanoida, Copepoda) from the Gulf of Bothnia, Baltic Sea, in relation to abundance and clonal differences of diatoms.
J. Ask, M. Reinikainen, and U. Bamstedt (2006)
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A multi-nutrient model for the description of stoichiometric modulation of predation in micro- and mesozooplankton.
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J. Plankton Res. 28, 597-611
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Effects of nitrogen stressed algae on different Acartia species.
C. B. Augustin and M. Boersma (2006)
J. Plankton Res. 28, 429-436
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Copepod grazing impact on the trophic structure of the microbial assemblage of the San Pedro Channel, California.
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Relationships between microzooplankton and mesozooplankton: competition versus predation on natural assemblages of the Gulf of Trieste (northern Adriatic Sea).
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Effect of food composition on egg production and hatching success rate of two copepod species (Calanoides carinatus and Rhincalanus nasutus) in the Benguela upwelling system.
X. Irigoien, H. M. Verheye, R. P. Harris, and D. Harbour (2005)
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Relationship between functional response and gut transit time in the calanoid copepod Acartia clausi: role of food quantity and quality.
V. Tirelli and P. Mayzaud (2005)
J. Plankton Res. 27, 557-568
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Effects of temporary food limitation on survival and development of brachyuran crab larvae.
L. Gimenez and K. Anger (2005)
J. Plankton Res. 27, 485-494
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Predator-prey interactions: is 'ecological stoichiometry' sufficient when good food goes bad?.
A. Mitra and K. J. Flynn (2005)
J. Plankton Res. 27, 393-399
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Science. ISSN 0036-8075 (print), 1095-9203 (online)