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The effect of the receding ice edge on the condition of copepods in the northwestern Weddell Sea: results from biochemical assays

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Copepoda: Developments in Ecology, Biology and Systematics

Part of the book series: Developments in Hydrobiology ((DIHY,volume 156))

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Abstract

We compared six biochemical measures of nutritional condition: citrate synthase activity (CS), malate and lactate dehydrogenase activity (MDH and LDH), RNA:DNA ratio, and percent body protein and lipid. Adult females of five species of calanoid copepod (Calanoides acutus, Calanus propinquus, Metridia gerlachei, Rhincalanus gigas and Paraeuchaeta antarctica) were collected in the marginal ice zone of the northwestern Weddell Sea at the time of the annual phytoplankton bloom that occurs in association with the receding ice edge during austral spring. Three zones within the marginal ice zone were sampled: heavy-ice-cover pre-bloom, ice-edge bloom and low-ice-cover post-bloom. Lipid generally increased greatly from ice-covered to open water zones, and its importance in the life of polar copepods cannot be overstated. Increases in protein from ice-covered to open water were also observed, but were of less significance. Each species exhibited significant changes in at least one enzyme activity level. Citrate synthase activity in C. acutus, C. propinquus and R. gigas, all herbivores, increased between pre-and post-bloom stations. C. propinquus and M. gerlachei, which feed during winter, had large increases in LDH activity between pre- and post-bloom stations. Rhincalanus gigas and P. antarctica, the two largest species studied, showed variations in MDH activity, with peak enzyme activity occurring in post-bloom stations. RNA:DNA ratio did not change in any species. The effects of size, shipboard handling and freezer storage were easily corrected statistically, and did not alter any conclusions. The patterns observed in copepod nutrition at the Antarctic ice edge were consistent with existing models of life history for each species. The observations reported here, in conjunction with previously reported data, suggested that measurement of metabolic enzyme activity, especially in concert with lipid, enables estimation of nutritional condition in adult copepods. Additional studies comparing metabolic activity and ecology of common species should yield more information on the ecology of rarer species.

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Author information

Authors and Affiliations

  1. Department of Marine Science, University of South Florida, 140 7th Ave. South, St. Petersburg, FL, 33701, USA

    Stephen P. Geiger & Joseph J. Torres

  2. Depto. de Biologia Celular, Universidade Federal do Paraná, Cx. Postal 19031, Curitiba, Paraná, 81531-970, Brazil

    Helena G. Kawall

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  1. Stephen P. Geiger
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  2. Helena G. Kawall
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  3. Joseph J. Torres
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Editors and Affiliations

  1. State University of Santa Cruz, Ilhéus, Brazil

    Rubens M. Lopes

  2. National Museum of Natural History, Washington, DC, USA

    Janet W. Reid

  3. University of São Paulo, Brazil

    Carlos E. F. Rocha

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© 2001 Kluwer Academic Publishers

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Geiger, S.P., Kawall, H.G., Torres, J.J. (2001). The effect of the receding ice edge on the condition of copepods in the northwestern Weddell Sea: results from biochemical assays. In: Lopes, R.M., Reid, J.W., Rocha, C.E.F. (eds) Copepoda: Developments in Ecology, Biology and Systematics. Developments in Hydrobiology, vol 156. Springer, Dordrecht. https://doi.org/10.1007/0-306-47537-5_7

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  • DOI: https://doi.org/10.1007/0-306-47537-5_7

  • Publisher Name: Springer, Dordrecht

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