Abstract
Faecal pellets were collected in 1988 from copepods which had fed in situ or in laboratory experiments, using screened natural seawater as food, at two stations off the coast of Labrador and one in the Gulf of St. Lawrence. The chemical composition of the pellets and of particulate material in profiles and in laboratory food were measured in terms of particulate carbon, carbohydrate (soluble and insoluble), protein and lipid. Faecal pellet composition was somewhat similar in all experiments at the first two stations, where the compositions of particulate material in situ and copepod species assemblages were also similar. At the third station the compositions of faecal pellets and particulate material were slightly different from those at the other stations and the copepod species composition varied between sampling times. Faecal pellets at the first two stations had very low levels of soluble carbohydrate, while concentrations in the food were generally high, suggesting that it was efficiently metabolized by copepods, although it might have been absent because of ‘sloppy feeding’ or release, after passage through the gut, in soluble form or from faecal pellets. Comparisons of POC: biogenic silica ratios in food and faecal pellets, calculated using data presented elsewhere (Head 1992; Mar. Biol. 112: 583–592), suggested that at these stations, where food concentrations were high (chlorophyll concentrations>8 μgl-1), copepods may have been assimilating carbon rather inefficiently.
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Baars, M. A., Oosterhuis, S. S. (1984). Diurnal rhythms in grazing on labelled food, gut fluorescence and digestive enzyme activities of North Sea copepods. Neth. J. Sea Res. 18: 97–119
Barlow, R. G. (1982). Phytoplankton ecology in the Southern Benguela Current. I. Biochemical composition. J. exp. mar. Biol. Ecol. 63: 209–227
Barnes, H., Blackstock, J. (1973). Estimation of lipids in marine animals and tissues: detailed investigation of the sulphophos-phovanillin method for ‘total’ lipids. J. exp. mar. Biol. Ecol. 12: 103–118
Barthel, K.-G. (1983). Food uptake and growth efficiency of Eurytemora affinis (Copepoda: Calanoida). Mar. Biol. 74: 257–267
Bienfang, P. K. (1980). Herbivorous diet affects fecal pellet settling. Can. J. Fish. aquat. Sciences 37: 1352–1357
Checkley, D. M., Entzeroth, L. C. (1985). Elemental and isotopic fractionation of carbon and nitrogen by marine, planktonic copepods and implications to the marine nitrogen cycle. J. Plankton Res. 7: 553–568
Conover, R. J. (1966). Factors affecting the assimilation of organic matter by zooplankton and the question of superfluous feeding. Limnol. Oceanogr. 11: 346–354
Dagg, M. J., Walser, W. E. Jr. (1986). The effect of food concentration on fecal pellet size in marine copepods. Limnol. Oceanogr. 31: 1066–1071
Downs, J. N., Lorenzen, C. J. (1985). Carbon: phaeopigment ratios of zooplankton fecal pellets as an index of herbivorous feeding. Limnol. Oceanogr. 30: 1024–1036
Geider, R. J. (1984). Light and nutrient effects on microalgal physiology. Ph. D. thesis, Chap. 10. Dalhousie University, Halifax
Hassett, R. P., Landry M. R. (1988). Short-term changes in feeding and digestion by the copepod Calanus pacificus. Mar. Biol. 99: 63–74
Head, E. J. H. (1992). Gut pigment accumulation and destruction by arctic copepods in vitro and in situ. Mar. Biol. 112: 583–592
Head, E. J. H., Harris, L. R., Abou Debs, C. (1985). Effect of daylength and food concentration on in situ diurnal feeding rhythms in Arctic copepods. Mar. Ecol. Prog. Ser. 24: 281–288
Hegseth, E. N. (1982). Chemical and species composition of the phytoplankton during the first spring bloom in Trondheimsfjorden, 1975. Sarsia 67: 131–141
Hirche, H.-J. (1981). Digestive enzymes of copepodids and adults of Calanus finmarchicus and C. helgolandicus in relation to particulate matter. Kieler Meeresforsch. (Sdhft) 5: 174–185
Honjo, S., Roman, M. R. (1978). Marine copepod fecal pellets: production, preservation and sedimentation. J. mar. Res. 36: 45–57
Kattner, G., Gercken, G., Eberlein, K. (1983). Development of lipids during a spring plankton bloom in the Northern North Sea. Mar. Chem. 14: 149–162
Komar, P. D., Morse, A. P., Small, L. F., Fowler, S. W. (1981). An analysis of sinking rates of natural copepods and euphausiid fecal pellets. Limnol. Oceanogr. 26: 172–180
Kotchert, G. (1978). Carbohydrate determination by the phenolsulphuric acid method. In: Hellebust, J. A., Craigie, J. S. (eds.) Handbook of phycological methods — physiological and biochemical methods. Cambridge Univ. Press, Cambridge, p. 95–97
Lowry, O. H., Rosebrough, N. J., Farr, A. I., Randall, R. J. (1951). Protein measurement with the Folin reagent. J. biol. Chem. 193: 265–275
Morales, C. E. (1987). Carbon and nitrogen content of copepod faccal pellets: effect of food concentration and feeding behavior. Mar. Ecol. Prog. Ser. 36: 107–114
Paffenhofer, G.-A., Knowles, S. C. (1979). Ecological implications of fecal pellet size, production and consumption by copepods. J. mar. Res. 37: 35–49
Petersen, G. L. (1977). A simplification for the protein assay method of Lowry et al. which is more generally applicable. Analyt. Biochem. 83: 346–356
Roy, S., Harris, R. P., Poulet, S. A. (1989). Inefficient feeding by Calanus helgolandicus on Coscinodiscus wailesii: quantitative estimation using chlorophyll-type pigments and effects on dissolved free amino acids. Mar. Ecol. Prog. Ser. 52: 145–153
Roy, S., Poulet, S. A. (1990). Laboratory study of the chemical composition of aging copepod fecal material. J. exp. mar. Biol. Ecol. 135: 3–18
Sakshaug, E. (1977). Limiting nutrients and maximum growth rates for diatoms in Narragansett Bay. J. exp. mar. Biol. Ecol. 28: 109–123
Shifrin, N. S., Chisholm, S. W. (1981). Phytoplankton lipids: interspecific differences and effects of nitrate, silicate and light-dark cycles. J. Phycol. 17: 374–384
Small, L. F., Fowler, S. W., Moore, S. A., LaRosa, J. (1983). Dissolved and fecal pellet carbon and nitrogen release by zooplankton in tropical waters. Deep-Sea Res. 30: 1199–1220
Small, L. F., Knauer, G. A., Tuel, M. D. (1987). The role of sinking fecal pellets in stratified euphotic zones. Deep-Sea Res. 34: 1705–1712
Smetacek, V. S. (1980). Zooplankton standing stock, copepod faecal pellets and particulate detritus in Kiel Bight. Estuar. cstl mar. Sci. 11: 477–490
Tande, K. S., Slagstad, D. (1985). Assimilation efficiency in herbivorous aquatic organisms — the potential of the ratio method using 14C and biogenic silica as markers. Limnol. Oceanogr. 30: 1093–1099
Welschmeyer, N. A., Copping, A. E., Vernet, M., Lorenzen, C. J. (1984). Diel fluctuation in zooplankton grazing rate as determined from the downward vertical flux of pheopigments. Mar. Biol. 83: 263–270
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Communicated by R. O'Dor, Halifax
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Head, E.J.H. Comparison of the chemical composition of particulate material and copepod faecal pellets at stations off the coast of Labrador and in the Gulf of St. Lawrence. Marine Biology 112, 593–600 (1992). https://doi.org/10.1007/BF00346177
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DOI: https://doi.org/10.1007/BF00346177