Diurnal feeding rhythms in north sea copepods measured by Gut fluorescence, digestive enzyme activity and grazing on labelled food

Arashkevich, 1977, Duration of food digestion in marine copepods, Pol. Arch. Hydrobiol., 24, 431 Baars, 1984, Grazing pressure of copepods on the phytoplankton stock of the central North Sea, Neth. J. Sea Res., 18, 120, 10.1016/0077-7579(84)90028-0 Boucher, 1974, L'activité amylasique indice de la nutrition du zooplancton; mise en évidence d'un rythme quotidien en zone d'upwelling, Tethys, 6, 179 Boucher, 1975, Étude de la nutrition du zooplancton en zone d'upwelling par la mesure des activités enzymatiques digestives, 329 Boucher, 1976, Étude de la nutrition, du régime et du rythme alimentaire du zooplancton dans les conditions naturelles, par la mesure des activités enzymatiques digestives, 2, 85 Boyd, 1980, Grazing patterns of copepods in the upwelling system off Peru, Limnol. Oceanogr., 25, 583, 10.4319/lo.1980.25.4.0583 Cox, 1981, Laminarinase induction in marine zooplankton and its variability in zooplankton samples, J. Plankton Res., 3, 345, 10.1093/plankt/3.3.345 Cox, 1981, Laminarinase induction in Calanus pacificus, Mar. Biol. Lett., 2, 307 Dagg, 1980, Natural feeding rates of Centropages typicus females in the New York Bight, Limnol. Oceanogr., 25, 597, 10.4319/lo.1980.25.4.0597 Dagg, 1983, Natural ingestion rates of the copepods Neocalanus plumchrus and N. cristatus calculated from gut contents, Mar. Ecol. Progr. Ser., 13, 37, 10.3354/meps013037 Daro, 1978, A simplified 14C method for grazing measurements on natural planktonic populations, Helgoländer wiss. Meeresunters., 31, 241, 10.1007/BF02296999 Daro, 1978, A simplified 14C method for grazing measurements on natural planktonic populations, Helgoländer wiss. Meeresunters., 31, 241, 10.1007/BF02296999 Daro, 1980, Field study of the diel feeding of a population of Calanus finmarchicus at the end of a phytoplankton bloom, “Meteor” Forsch. Ergebn., A 22, 123 Enright, 1977, Diurnal vertical migration: adaptive significance and timing. Part 1. Selective advantage: a metabolic model, Limnol. Oceanogr., 22, 856, 10.4319/lo.1977.22.5.0856 Enright, 1977, Diurnal vertical migration: adaptive significance and timing, 2. Test of the model: details of timing, Limnol. Oceanogr., 22, 873, 10.4319/lo.1977.22.5.0873 Fransz, 1984, Mesozooplankton composition, biomass and vertical distribution, and copepod production in the stratified North Sea, Neth. J. Sea Res., 18, 82, 10.1016/0077-7579(84)90026-7 Gamble, 1978, Copepod grazing during a declining spring phytoplankton bloom in the northern North Sea, Mar. Biol., 49, 303, 10.1007/BF00455025 Gaudy, 1974, Feeding four species of pelagic copepods under experimental conditions, Mar. Biol., 25, 125, 10.1007/BF00389261 Gaudy, 1983, Relation between respiration, excretion (ammonia and inorganic phosphorus) and activity of amylase and trypsin in different species of pelagic copepods from an Indian Ocean equatorial area, Mar. Biol., 75, 37, 10.1007/BF00392628 Gauld, 1953, Diurnal variations in the grazing of planktonic copepods, J. mar. biol. Ass. U.K., 31, 461, 10.1017/S0025315400011619 Gibbs, 1979, Chlorophyll b interference in the fluorometric determination of chlorophyll and “phaeo-pigments”, Aust. J. mar. Freshwat. Res., 30, 597, 10.1071/MF9790597 Gieskes, 1984, Phytoplankton, its pigments, and primary production at a central North Sea station in May, July and September 1981, Neth. J. Sea Res., 18, 51, 10.1016/0077-7579(84)90024-3 Haney, 1971, An in situ method for the measurement of zooplankton grazing rates, Limnol. Oceanogr., 16, 970, 10.4319/lo.1971.16.6.0970 Hallberg, 1980, Differentiation of mid-gut in adults and overwintering copepodids of Calanus finmarchicus (Gunnerus) and C. helgolandicus Claus, J. exp. mar. Biol. Ecol., 48, 283, 10.1016/0022-0981(80)90083-0 Hargis, 1977, Comparisons of techniques for the measurement of zooplankton filtration rates, Limnol. Oceanogr., 22, 942, 10.4319/lo.1977.22.5.0942 Hassett, 1983, Effects of food-level acclimation on digestive enzyme activities and feeding behaviour of Calanus pacificus, Mar. Biol., 75, 47, 10.1007/BF00392629 Hayward, 1980, Spatial and temporal feeding patterns of copepods from the North Pacific central gyre, Mar. Biol., 58, 295, 10.1007/BF00390778 Hirche, 1981, Digestive enzymes of copepodids and adults of Calanus finmarchicus and C. helgolandicus in relation to particulate matter, Kieler Meeresforsch. (Sonderheft), 5, 174 Holm-Hansen, 1965, Fluorometric determination of chlorophyll, J. Cons. perm. int. Explor. Mer, 30, 3, 10.1093/icesjms/30.1.3 Holtby, 1981, Zooplankton filtering rates: error due to loss of radioisotopic label in chemically preserved samples, Limnol. Oceanogr., 26, 774, 10.4319/lo.1981.26.4.0774 Huntley, 1983, Particle rejection by Calanus pacificus: discrimination between similarly sized particles, Mar. Biol., 74, 151, 10.1007/BF00413918 Huntley, 1982, Effects of age and food availability on diel vertical migration of Calanus pacificus, Mar. Biol., 71, 23, 10.1007/BF00396989 Ikeda, 1980, The effect of laboratory conditions on the extrapolation of experimental measurements to the ecology of marine zooplankton. VI. Changes in physiological activities and biochemical components of Acetes sibogae australis and Acartia australis after capture, Mar. Biol., 58, 285, 10.1007/BF00390777 Kiørboe, 1982, Ingestion rate and gut clearance in the planktonic copepod Centropages hamatus (Lilljeborg) in relation to food concentration and temperature, Ophelia, 21, 181, 10.1080/00785326.1982.10426586 Klein Breteler, 1980, Continuous breeding of marine pelagic copepods in the presence of heterotrophic dinoflagellates, Mar. Ecol. Progr. Ser., 2, 229, 10.3354/meps002229 Klein Breteler, 1982, Growth and development of calanoid copepods under experimental and natural conditions, Neth. J. Sea Res., 16, 195, 10.1016/0077-7579(82)90030-8 Mackas, 1976, Fluorescence analysis of zooplankton gut contents and an investigation of diel feeding patterns, J. exp. mar. Biol. Ecol., 25, 77, 10.1016/0022-0981(76)90077-0 McMahon, 1965, Feeding rate of Daphnia magna Straus in different foods labeled with radioactive phosphorus, Limnol. Oceanogr., 10, 105, 10.4319/lo.1965.10.1.0105 Marshall, 1924, The food of Calanus finmarchicus during 1923, J. mar. biol. Ass. U.K., 13, 473, 10.1017/S002531540000761X Mayzaud, 1980, Some sources of variability in determination of digestive enzyme activity in zooplankton, Can. J. Fish. Aquat. Sci., 37, 1426, 10.1139/f80-182 Mayzaud, 1976, Influences of potential food supply on the activity of digestive enzymes of neritic zooplankton, 2, 415 Mayzaud, 1978, The importance of the time factor in the response of zooplankton to varying concentrations of naturally occurring particulate matter, Limnol. Oceanogr., 23, 1144, 10.4319/lo.1978.23.6.1144 Montagna, 1983, Live controls for radioisotope tracer food chain experiments using meiofauna, Mar. Ecol. Progr. Ser., 12, 43, 10.3354/meps012043 Nemoto, 1968, Chlorophyll pigments in the stomach of euphausiids, J. oceanogr. Soc. Japan, 24, 253, 10.5928/kaiyou1942.24.253 Nicolajsen, 1983, Algal grazing by the planktonic copepods Centropages hamatus and Pseudocalanus sp.: diurnal and seasonal variation during the spring phytoplankton bloom in the Øresund, Ophelia, 22, 15, 10.1080/00785326.1983.10427222 Roman, 1981, A method to determine in situ zooplankton grazing rates on natural particle assemblages, Mar. Biol., 65, 303, 10.1007/BF00397126 Samain, 1977, Trypsine, amylase et protéines du zooplancton: dosage automatique et manuel, J. exp. mar. Biol. Ecol., 29, 279, 10.1016/0022-0981(77)90071-5 Tande, 1982, Ecological investigation on the zooplankton community of Balsfjorden, northern Norway. Seasonal and short-time variations in enzyme activity in copepodite stage V and VI males and females of Calanus finmarchicus (Gunnerus), Sarsia, 67, 63, 10.1080/00364827.1982.10421334 Tijssen, 1984, Hydrographic observations near a subsurface drifter in the Oyster Ground, North Sea, Neth. J. Sea Res., 18, 1, 10.1016/0077-7579(84)90021-8 Wimpenny, 1938, Diurnal variation in the feeding and breeding of zooplankton related to the numerical balance of the zoophytoplankton community, J. Cons. perm. int. Explor. Mer, 13, 323, 10.1093/icesjms/13.3.323