Copepod grazing

Ives, J. D., Possible mechanisms underlying copepod grazing responses to levels of toxicity in red tide dinoflagellates, J. Exp. Mar. Biol. Ecol., 112, 131, 1987. 

Head, E.J.H., and Harris, L.R. (1994) Feeding selectivity by copepods grazing on natural mixtures of phytoplankton determined by HPLC analysis of pigments. Mar. Ecol. Prog. Ser. 110, 75-83. 

Turner JT, Ianora A, Esposito F, Carotenuto Y, Miralto A (2002). Zooplankton feeding ecology does a diet of Phaeocystis support good copepod grazing, survival, egg production and egg hatching success. J Plankton Res 24(11) 1185—1195... 

Hutchins, D. A., Wang, W., and Fisher, N. S. (1995). Copepod grazing and the biogeochemical fate of diatom iron. Limnol. Oceanogr. 40, 989—994. 

Frost, R. W. (1987). Grazing control of phytoplankton stock in the open subarctic Pacific ocean a model assessing the role of mesozooplankton, particularly the large calanoid copepods Neocalanus spp. Mar. Ecol. Prog. Ser. 39, 49-68. 

Another RP-HPLC procedure was applied for the study of the distribution and stability of steryl chlorin esters in copepod faecal pellets from diatom grazing. Pigments were sonicated for 15 min with acetone at 0°C and the procedure was repeated until the extract became colourless. The organic phase was evaporated and the fraction containing the free alcohols was separated by TLC (silica stationary and dichloromethane mobile phases) and analysed by gas chromatography. RP-HPLC measurements were performed in an ODS... 

The photo synthetic aquatic biomass comprises cyanobacteria (formerly called blue-green algae), planktonic, filamentous and macrophytic algae, and vascular macrophytes. The net productivity of the floodwater depends on the level of primary production by the photosynthetic biomass versus its consumption by grazing animals, particularly cladocerans, copepods, ostracods, insect larvae and molluscs. Their role will change as the canopy develops and at a leaf area index of about 6-7 there will be no more photosynthetically active radiation available to them. 

Reports on copepods and other crustaceans dominate available zooplankton grazing data on Phaeocystis spp. These data show a wide range of rates, even for similar predator-prey combinations. We therefore attempt to summarize available quantitative data in relation to some of the mechanisms proposed to control the feeding on Phaeocystis. The shortage of quantitative feeding studies on microzooplankton and Phaeocystis was pointed out already a decade ago (Weisse et al. 1994), and the number of such studies is still limited, especially for protozoan microzooplankton, whether using laboratory cultures (Table 3)... 

Copepods may feed selectively based on nutritional quality of the prey (e.g., Houde and Roman 1987). However, it is not clear how food quality of the different forms of Phaeocystis affects zooplankton grazing. It has been suggested that Phaeocystis spp. are of low nutritional value due to their low content of polyunsaturated fatty acids (PUFA) (Al-Hasan et al. 1990 Claustre et al. 1990 Rogers and Lockwood 1990 Nichols et al. 1991 Cotonnec et al. 2001 Tang et al. 2001 Turner et al. 2002). This contrasts with the high survival and development rates observed in other... 

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