Abstract
Seventeen Longhurst Hardy Plankton Recorder profiles were taken over a diel cycle in January 1990 to study the feeding of four major copepods over the South Georgia shelf. Ontogenetic changes in vertical migration were followed and feeding cycles determined by gut fluorometry for Calanoides acutus Stage CV, Calanus sinillimus CV and CVI♀, C. propinquus CV and Rhincalanus gigas CV and CVI♀. In common with a neighbouring oceanic site visited two weeks later and reported elsewhere, all four species had a diel cycle of feeding and migration. The vertical distributions of C. simillimus (all stages), R. gigas (nauplii) and Euphausia frigida (postlarvae) were similar at both sites, the night being spent within the chlorophyll maximum at 15 to 30 m. However, the biomass dominants, C. acutus and R. gigas, dwelt below the chlorophyll maximum, about 30 m deeper than their oceanic counterparts. Unlike the oceanic site, feeding at the shelf site was not restricted to darkness, but increased 6 to 10 h before nightfall and finished at dawn; the intervening period coincided with sinking and digestion. Daylight feeding may have been induced by the shorter night, lower light levels or greater food requirements at the shelf site, despite planktonic predators being over three times more abundant. Daily ration estimates for R. gigas at both sites were only ∼2% body carbon per day. These low values contrast with its smaller competirors, whose rations were in the range 5.6 to 27%.
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Literature
Atkinson, A. (1991). Life cycles of Calanoides acutus, Calanus simillimus and Rhincalanus gigas (Copepoda: Calanoida) within the Scotia Sea. Mar. Biol. 109: 79–91
Atkinson, A., Ward, P., Williams, R., Poulet, S. A. (1992). Diel vertical migration and feeding of copepods at an oceanic site near South Georgia. Mar Biol. 113: 583–593
Boyd, C. M., Smith, S. L., Cowles, T. J. (1980). Grazing patterns of copepods in the upwelling system off Peru. Limnol. Oceanogr. 25: 583–596
Boysen-Ennen, E., Hagen, W., Hubold, G., Piatkowski, U. (1991). Zooplankton biomass in the ice-covered Weddell Sea, Antarctica. Mar. Biol. 111: 227–235
Croxall, J. P., Prince, P. A., Ricketts, C. (1985). Relationships between prey life cycle and the extent, nature and timing of seabird predation in the Scotia Sea. In: Siegfried, W. R., Laws, R. M. (eds.) Antarctic nutrient cycles and food webs. Proceedings of 4th SCAR Symposium on Antarctic Biology. Springer-Verlag, Berlin, p. 35–40
Dagg, M. J., Frost, B. W., Walser, W. E., Jr. (1989). Copepod diel migration, feeding, and the flux of phaeopigments. Limnol. Oceanogr. 34: 1062–1071
Dam, H. G., Peterson, W. T., Okubo, A. (1991). A simple mathmatical analysis of the limitations to inferring feeding behaviour of zooplankton from gut content. Mar. Ecol. Prog. Ser. 69: 41–45
Daro, M. H. (1988). Migratory and grazing behaviour of copepods and vertical distribution of phytoplankton. Bull. mar. Sci. 43: 710–729
Drits, A. V., Pasternak, A. F., Tseitlin, V. B. (1990). Diel feeding rhythm in Antarctic copepod Calanus propinquus. Okeanologiya, Mosk. 30: 999–1005 [English transl.]
Ellis, S. G., Small, L. F. (1989). Comparison of gut-evacuation rates of feeding and non-feeding Calanus marshallae. Mar. Biol. 103: 175–181
El-Sayed, S. Z. (1988). Seasonal and interannual variabilities in Antarctic phytoplankton with reference to krill distribution. In: Sahrhage, D. (ed.) Antarctic ocean and resources variability. Springer-Verlag, Berlin, p. 101–119
Enright, J. T. (1977). Diurnal vertical migration: adaptive significance and timing. Part. 1. Selective advantage: a metabolic model. Limnol. Oceanogr. 22: 873–886
Fenchel, T. (1988). Marine plankton food chains. A. Rev. Ecol. Syst. 19: 19–38
Frost, B. W. (1988). Variability and possible adaptive significance of diel vertical migration in Calanus pacificus, a planktonic marine copepod. Bull. mar. Sci. 43: 675–694
Gliwicz, M. Z., Pijanowska, J. (1988). Effect of predation and resource depth distribution on vertical migration of zooplankton. Bull. mar. Sci. 43: 695–709
Harris, R. P. (1988). Interactions between diel vertical migratory behaviour of marine zooplankton and the subsurface chlorophyll maximum. Bull. mar. Sci. 43: 663–674
Head, E. J. H. (1986). Estimation of Arctic copepod grazing rates in vivo and comparison with in-vitro methods. Mar. Biol. 92: 371–379
Head, E. J. H. (1988). Copepod feeding behaviour and the measurement of grazing rates in vivo and in vitro. Hydrobiologia 167/168: 31–41
Head, E. J. H., Harris, L. R. (1987). Copepod feeding patterns before and during a spring bloom in Bedford Basin, Nova Scotia. Mar. Ecol. Prog. Ser. 40: 221–230
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
Hopkins, T. L. (1971). Zooplankton standing crop in the Pacific sector of Antarctic. Antarctic Res. Ser. 17: 347–362
Hopkins, T. L., Torres, J. J. (1989). Midwater food web in the vicinity of a marginal ice zone in the western Weddell Sea. Deep-Sea Res. 36: 543–560
Huntley, M. F., Escritor, F. (1991). Dynamics of Calanoides acutus (Copepoda: Calanoida) in Antarctic coastal waters. Deep-Sea Res. 38: 1145–1167
Longhurst, A. R., Williams, R. (1976). Improved filtration systems for multiple-serial plankton samplers and their deployment. Deep-Sea Res. 23: 1067–1073
Lopez, M. D. G., Huntley, M. E., Sykes, P. F. (1988). Pigment destruction by Calanus pacificus: impact on the estimation of water column fluxes. J. Plankton Res. 10: 715–734
Mackas, D., Bohrer, R. (1976). Fluorescence analysis of zooplankton gut contents and an investigation of diel feeding patterns. J. exp. mar. Biol. Ecol. 25: 77–85
Marin, V., (1988). Qualitative models of the life cycles of Calanoides acutus, Calanus propinquus and Rhincalanus gigas. Polar Biol. 8: 439–446
Morales, C. E., Bautista, B., Harris, R. P. (1990). Estimates of ingestion in copepod assemblages: gut fluorescence in relation to body size. In: Barnes, M., Gibson, R. N. (eds.) Trophic relationships in the marine environment; Aberdeen University Press, Aberdeen, p. 565–577
Morales, C. E., Bedo, A., Harris, R. P., Tranter, P. R. G. (1991). Grazing of copepod assemblages in the north-east Atlantic: the importance of the small size fraction. J Plankton Res. 13: 455–472
Nott, J. A., Corner, E. D. S., Mavin, L. J., O'Hara, S. C. M. (1985). Cyclical contributions of the digestive epithelium to faecal pellet formation by the copepod Canalus helgolandicus. Mar. Biol. 89: 271–279
Parsons, T. R., Maita, Y., Lalli, C. M. (1984). A manual of chemical and biological methods for seawater analysis. Pergamon Press, Oxford
Penry, D. L., Frost, B. W. (1990). Re-evaluation of the gut-fullness (gut fluorescence) method for inferring ingestion rates of suspension feeding copepods. Limnol. Oceanogr. 35: 1207–1214
Peterson, W. T., Painting, S. J., Hutchings, L. (1990). Diel variations in gut pigment content, diel vertical migration and estimates of grazing impact for copepods in the southern Benguela upwelling region in October 1987. J. Plankton Res. 12: 259–281
Roman, M. R., Yentsch, C. S., Gauzens, A. L., Phinney, D. A. (1986). Grazer control of the fine-scale distribution of phytoplankton in warm-core Gulf Stream rings. J. mar. Res. 44: 795–813
Schnack, S. B. (1983). Feeding of two Antarctic copepod species on a mixture of centric diatoms. Polar Biol. 2: 63–68
Schnack, S. B. (1985). Feeding by Euphausia superba and copepod species in response to varying concentrations of phytoplankton. In: Siegfried, W. R., Condy, P. R., Laws, R. M. (eds.) Anatarctic nutrient cycles and food webs. Proceedings of 4th SCAR Symposium on Antarctic Biology. Springer-Verlag, Berlin, p. 311–323
Schnack, S. B., Smetacek, V., von Bodungen, B., Stegmann, P. (1985). Utilization of phytoplankton by copepods in Antarctic waters during spring. In: Gray, J. S., Christiansen, M. E. (eds) Marine biology of polar regions and effects of stress on marine organisms. John Wiley & Sons Ltd., London, p. 65–81
Schnack-Schiel, S. B., Hagen, W., Mizdalski, E. (1991). Seasonal comparison of Calanoides acutus and Calanus propinquus (Copepoda: Calanoida) in the southeastern Weddell Sea, Antarctica. Mar. Ecol. Prog. Ser. 70: 17–27
Smith, S. L., Schnack-Schiel, S. B. (1990). Polar zooplankton. In: Smith, W. O. (ed.) Polar oceanography, Part B: chemistry, biology and geology. Academic Press, San Diego, p. 527–597
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 phaeopigments. Mar. Bio. 83: 263–270
Welschmeyer, N. A., Lorenzen, C. J. (1985). Chlorophyll budgets: zooplankton grazing and phytoplankton growth in a temperate fjord and the Central Pacific Gyre. Limnol. Oceanogr. 30: 1–21
Williams, R., Collins, N. R., Conway, D. V. P. (1983). The double LHPR system, a high speed micro-and macroplankton sampler. Deep-Sea Res. 30: 331–342
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Communicated by J. Mauchline, Oban
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Atkinson, A., Ward, P., Williams, R. et al. Feeding rates and diel vertical migration of copepods near South Georgia: comparison of shelf and oceanic sites. Marine Biology 114, 49–56 (1992). https://doi.org/10.1007/BF00350855
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DOI: https://doi.org/10.1007/BF00350855