Abstract
In our field study we analyzed the C and H isotopic and biochemical (C, N, P, protein, lipid, carbohydrate) composition of the jellyfish Pelagia noctiluca (collected from the Gulf of Trieste in 1985 to 1986) and its presumed diet-net zooplankton. The mean δ 13C (-18.8‰) and δ D (-58.4‰) ratios of P. noctiluca showed enrichment in heavy isotopes relative to net zooplankton (∼2‰ for carbon and ∼30‰ for hydrogen). Both the jellyfish and net zooplankton were characterized by a linear correlation between δ 13C and δ D. C. N, P, protein, lipid, and carbohydrate contents of P. noctiluca were low on a dry weight basis as compared to net zooplankton. Significantly lower C:N and C:P ratios were found in jellyfish indicating a greater loss of carbon relative to nitrogen and phosphorus along the passage to a higher trophic level. Isotopic and biochemical evidence indicate that, though collected in nearshore waters, P. noctiluca depended on autochthonous marine organic matter.
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Barnes, H., Blackstock, J. (1973). Estimation of lipids in marine animals and tissues: detailed investigations of the sulpho-vanilin method for total lipids. J. exp. mar. Biol. Ecol., 12: 103–118
Benović, A., Fonda Umani, S., Malej, A., Specchi, M. (1984). Net zooplankton biomass in the Adriatic Sea. Mar. Biol. 79: 209–218
Bradford, M. (1976). A rapid and sensitive method for the quantitation of microgram proteins using the principle of protein-dye binding. Analyt. Biochem. 72: 254–284
Checkley, D. M., Entzroth, L. C. (1985). Elemental and isotopic fractionations of carbon and nitrogen by marine, planktonic copepods and implications to the marine nitrogen cycle. J. Plankton Res. 7: 553–568
Clarke, A., Holmes, L. J., Gore, D. J. (1992). Proximate and elemental composition of gelatinous zooplankton from the Southern Ocean. J. exp. mar. Biol. Ecol. 155: 55–68
Degens, E. T. (1969). Biogeochemistry of stable carbon isotopes. In: Eglinton, E., Murphy, M. T. J. (eds.) Organic geochemistry. Springer-Verlag, New York, p. 304–329
DeNiro, M., Epstein, S. (1978). Influence of diet on the distribution of carbon isotopes in animals. Geochim. cosmochim. Acta 42: 495–506
Dubois, M., Gilles, K. A., Hamilton, J. K., Rebers, A., Smith, F. (1956). Colorimetric method for determination of sugars and related substances. Analyt. Chem. 28: 350–356
Faganeli, J., Malej, A., Pezdič, J. (1990). Sources and flow suspended organic matter in the Gulf of Trieste (Northern Adriatic). MAP Tech. Rep. Ser. 45: 183–205
Faganeli, J., Malej, A., Pezdič, J., Malačič, V. (1988). C:N:P: ratios and stable C isotopic ratios as indicators of sources of organic matter in the Gulf of Trieste (Northern Adriatic). Oceanol. Acta 11: 377–382
Fry, B. (1988). Food web structure on Georges Bank from ftable C, N, and S isotopic composition. Limnol. Oceanogr. 33: 1182–1190
Fry, B., Arnold, C. (1982). Rapid 13C/12C turnover during growth of brown shrimp (Penaeus aztecus. Oecologia 54: 200–204
Fry B., Sherr, E. B. (1984). δ13C measurements as indicators of carbon flow in marine and freshwater ecosystems. Contr. mar. Sci. 27: 13–47
Gearing, J. N., Gearing, P. J., Rudnick, D. T., Requejo, A. G., Hutchins, M. J. (1984). Isotopic variability of organic carbon in a phytoplanktonbased, temperate estuary. Geochim. cosmochim. Acta 48: 1035–1041
Goering, J., Alexander, V., Haubenstock, N. (1990). Seasonal variability of stable carbon and nitrogen isotope ratios of organisms in a north Pacific bay. Estuar. Cstl Shelf Sci. 30: 239–260
Gorsky, G., Dallot, S., Sardou, J., Fenaux, R., Carre, C., Palazzoli, I. (1988). C and N composition of some northwestern Mediterranean zooplankton and micronekton species. J. exp. mar. Biol. Ecol. 124: 133–144
Grasshoff, K. (1976). Methods of sea water analyses. Verlag Chemie, Weinheim, p. 317
Kremer, P., Reeve, M. R. (1989). Growth dynamics of a ctenophore (Mnemiopsis) in relation to variable food supply. II. Carbon budgets and growth model. J. Plankton Res. 11: 553–574
Larson, R. J. (1986a). Water content, organic content, and carbon and nitrogen composition of medusae from the nrotheast Pacific. J. exp. mar. Biol. Ecol. 99: 107–120
Larson, R. J. (1986b). Water content, organic content, and carbon and nitrogen composition of medusae from the northeast Pacific. J. exp. mar. Biol. Ecol. 99: 107–120
Madin, L. P., Cetta, C. M., McAlister, V. L. (1981). Elemental and biochemical composition of salps (Tunicata: Thaliacea). Mar. Biol. 63: 217–226
Malej, A. (1982). Unusual occurrence of Pelagia noctiluca in the Adriatic Sea. I. Some notes on its biology. Acta adriat. 23: 97–102 (in Slovenian)
Malej, A. (1989a). Behaviour and trophic ecology of the jellyfish Pelagia noctiluca (Forsskal 1775). J. exp. mar. Biol. Ecol. 126: 259–270
Malej, A. (1989b). Respiration and excretion rates of Pelagia noctiluca (Semaeostomae, Scyphozoa). Proc. 21st Eur. mar. Biol. Symp. 107-113 (1989) Klekowski, R. Z. et al. (eds.) Institute of Oceanology, Polish Academy of Sciences, Gdansk
Malej, A., Malej, M. (1992). Population dynamics of the jellyfish Pelagia noctiluca (Forsskal 1775). In: Colombo G., Ferrari, I., Ceccherelli, V. U., Rossi, R. (eds.) Marine eutrophication and population dynamics. Olsen & Olsen, ISS, Fredensborg, p. 215–219
Murphy, J., Riley, J. P. (1962). A modified single solution method for the determination of phosphate in natural waters. Analytica chim. Acta 27: 31–36
Rau, G. H., McHugh, C. M., Harrold, C., Baxter, C., Hecker, B., Embley, R. W. (1990). δ 13C, δ 15N, δ 18O of Calyptogena phaseoliformis (bivalve mollusc) from the Ascension Fan-Valley near Monterey, California. Deep-Sea Res. 37: 1669–1676
Raymont, J. E. G. (1983). Plankton and productivity. Zooplankton. Pergamon Press, Oxford, p. 284
Russell, F. S. (1970). The medusae of the British Isles. II. Pelagic Scyphozoa. University Press, Cambridge, p. 284
Simenstad, C. A., Wissmar, R. C. (1985). δ 13C evidence of the origins and fates of organic carbon in estuarine and near-shore food webs. Mar. Ecol. Prog. Ser. 22: 141–152
Stoecker, D. K., Michaels, A. E., Davis, L. H. (1987). Grazing by the jellyfish, Aurelia aurita, on micorzooplankton. J. Plankton Res. 9: 901–915
Tan, F. C., Strain, P. M. (1988). Stable isotope studies in the Gulf of St. Lawrence. Can. Bull. Fish. aquat. Sciences 220: 59–77
van der Veer, H. W., Oorthuysen, W. (1985). Abundance, growth and food demand of the scyphomedusa Aurelia aurita in the western Wadden Sea. Neth. J. Sea Res. 19: 38–44
Zavodnik, D. (1987). On the food and feeding of Pelagia noctiluca in the North Adriatic. 2nd Workshop Jellyfish Blooms Mediterr. UNEP, Trieste, 2–5 Sept. 1987
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Communicated by O. Kinne, Oldendorf/Luhe
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Malej, A., Faganeli, J. & Pezdič, J. Stable isotope and biochemical fractionation in the marine pelagic food chain: the jellyfish Pelagia noctiluca and net zooplankton. Marine Biology 116, 565–570 (1993). https://doi.org/10.1007/BF00355475
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DOI: https://doi.org/10.1007/BF00355475