Abstract
In situ diel variations in gut pigment contents of neritic (Acartia omorii andPseudocalanus minutus) and oceanic copepods (Calanus plumchrus andC. cristatus) were analyzed.A. omorii andP. minutus were sampled in Onagawa Bay on the east coast of Japan in May and August 1987, andC. plumchrus andC. cristatus were sampled in the Bering Sea in June 1986. Gut pigments were generally high at night, and bimodal feeding rhythms were observed in all species. The first peak of gut pigments occurred between sunset and midnight and was followed by a midnight decrease in gut pigment levels, resulting in eventual evacuation of the gut. The second peak was observed a few hours after sunrise. Incubation experiments indicated that ingestion rates of starved copepods were higher than those of acclimated copepods. This phenomenon was most notable at high food concentrations. Gut pigments of starved copepods rapidly increased after exposure to high concentrations of culturedThalassiosira decipiens. These findings suggest that in situ feeding behavior of herbivorous copepods includes periods of cessation or reduction in feeding during the night, and consequently, feeding activity is periodically enhanced with starvation. Starvation enhanced feeding behavior is most obvious in the large oceanic species,C. plumchrus andC. cristatus and is not distinct in small coastal species such asA. omorii.
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Baars, M. A., Oosterhuis, S. S. (1984). Diurnal feeding rhythms in North Sea copepods measured by gut fluorescence, digestive enzyme activity and grazing on labelled food. Neth. J. Sea Res. 18: 97–119
Batchelder, H. P. (1986). Phytoplankton balance in the oceanic subarctic Pacific: grazing impact ofMetridia pacifica. Mar. Ecol. Prog. Ser. 34: 213–225
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
Conover, R. J., Durvasula, R., Roy, S., Wang, R. (1986). Probable loss of chlorophyll-derived pigments during passage through the gut of zooplankton, and some of the consequences. Limnol. Oceanogr. 31: 878–887
Dagg, M. J. (1977). Some effect of patchy food environments on copepods. Limnol. Oceanogr. 22: 99–107
Dagg, M. J. (1983). A method for the determination of copepod feeding rates during short time intervals. Mar. Biol. 75: 63–67
Dagg, M. J., Grill, D. W. (1980). Natural feeding rates ofCentropages typicus females in the New York Bight. Limnol. Oceanogr. 25: 597–609
Dagg, M. J., Walser, W. E. (1987). Ingestion, gut passage, and egestion by the copepodNeocalanus plumchrus in the laboratory and in the subarctic Pacific Ocean. Limnol. Oceanogr. 32: 178–188
Dagg, M. J., Wyman, K. D. (1983). Natural ingestion rates of the copepodsNeocalanus plumchrus andN. cristatus calculated from gut contents. Mar. Ecol. Prog. Ser. 13: 37–46
Duval, W. S., Geen, G. H. (1976). Diel feeding and respiration rhythms in zooplankton. Limnol. Oceanogr. 21: 823–829
Frost, B. W. (1972). Effects of size and concentration of food particles on the feeding behavior of the marine planktonic copepodCalanus pacificus. Limnol. Oceanogr. 17: 805–815
Gauld, D. T. (1953). Diurnal variations in the grazing of planktonic copepods. J. mar. biol. Ass. U.K. 31: 461–474
Hassett, R. P., Landry, M. R. (1983). Effects of food-level acclimation on digestive enzyme activities and feeding behavior ofCalanus pacificus. Mar. Biol. 75: 47–55
Hassett, R. P., Landry, M. R. (1988). Short-term changes in feeding and digestion by the copepodCalanus pacificus. Mar. Biol. 99: 63–74
Hayward, T. L. (1980). Spatial and temporal feeding patterns of copepods from the North Pacific central gyre. Mar. Biol. 58: 295–309
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., Wang, R., Conover, R. J. (1984). Comparison of diurnal feeding rhythms inTemora longicornis andCentropages hamatus with digestive enzyme activity. J. Plankton Res. 6: 543–551
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
Huntley, M. E., Marin, V., Escritor, F. (1987). Zooplankton grazers as transformers of ocean optics: a dynamic model. J. mar. Res. 45: 911–945
Ishii, H. (1988). Feeding rhythms of herbivorous copepods. Ph.D. thesis, Tohoku University, Sendai [In Jap.]
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
Mackas, D. L., Burns, K. E. (1986). Poststarvation feeding and swimming activity inCalanus pacificus andMetridia pacifica. Limnol. Oceanogr. 31: 383–392
McAllister, C. D. (1970). Zooplankton rations, phytoplankton mortality and the estimation of marine production. In: Steele, J. H. (ed.) Marine food chains. Oliver and Boyd, Edinburgh, p. 419–457
Mullin, M. M. (1963). Some factors affecting the feeding of marine copepods of the genusCalanus. Limnol. Oceanogr. 8: 239–250
Omori, M. (1969). Weight and chemical composition of some important oceanic zooplankton in the North Pacific Ocean. Mar. Biol. 3: 4–10
Omori, M., Ikeda, T. (1984). Methods in marine zooplankton ecology. Wiley-Interscience, New York
Pearre, S. (1973). Vertical migration and feeding inSagitta elegans Verrill. Ecology 54: 300–314
Pearre, S. (1979). Problems of detection and interpretation of vertical migration. J. Plankton Res. 1: 29–44
Runge, J. A. (1980). Effects of hunger and season on the feeding behavior ofCalanus pacificus. Limnol. Oceanogr. 25: 134–145
Simard, Y., Lacroix, G., Legendre, L. (1985). In situ twilight grazing rhythm during diel vertical migrations of a scattering layer ofCalanus finmarchicus. Limnol. Oceanogr. 30: 598–606
Stearns, D. (1986). Copepod grazing behavior in simulated natural light and its relation to nocturnal feeding. Mar. Ecol. Prog. Ser. 30: 65–76
Strickland, J. D. H., Parsons, T. R. (1972). A practical handbook of seawater analysis, 2nd ed. Bull. Fish. Res. Bd Can. 167
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Communicated by M. Anraku, Tokyo
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Ishii, H. In situ feeding rhythms of herbivorous copepods, and the effect of starvation. Mar. Biol. 105, 91–98 (1990). https://doi.org/10.1007/BF01344274
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DOI: https://doi.org/10.1007/BF01344274