Faecal pellets

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... [Pg.300]

Fig. 2.128. HPLC-MS summed base peak mass chromatograms of total extracts of (a) T. weissflogii culture, (b) control, (c) faecal pellets immediately after grazing (48h) and (d) pellets after ageing in filtered seawater in the dark for 30 days. Peak identification a = phaeophorbide-a b = pyrophaeophorbide-a c = 132-chlorophyllone-a d = 132-epi-chlorophyllone-a (carotenoid) e + f = 132-hydroxyhlorophyll-a, 15 -hydroxylactone, chlorophyll-a g = chlorophyll-a g = chlorophyll-a epimer h = chlorophyll-a-like i = hydroxyphaeophytin-a + unknown i = hydroxyphaeophytin-a epimer j = phaeophytin-a j = phaeophytin-a epimer k = purpurin-18-phytyl ester 1 = pyrophaeophytin-a m = chlorine-a-like t = 132-oxopyrophaeophytin-a u = 132-oxopyrophaeophorbide a-24-methylcholesta-5,24(28)-dien-3/ -yl-ester SCE Sterol n = C272 d.b.a o = C27 2 d.b. +C28 2 d.b. p = C29 2 d.b. q = C27 1 d.b. r = C28 1 d.b. + C29 2 d.b. s = C29 2 d.b. Reprinted with permission from H. M. Talbot et al. [293], (ad.b = number of double bonds. = carotenoid.)...

Harris, P.G., Carter, J.F., Head, R.N., Harris, R.P., Eglinton, G., and Maxwell, J.R. (1995) Identification of chlorophyll transformation products in zooplankton faecal pellets and marine sediment extracts by liquid chromatography/mass spectrometry atmospheric pressure chemical ionization. Rapid Cornmun. Mass Spectrom. 9, 1177-1183. [Pg.592]

Prahl F.G, Eglinton G, Comer E.D.S. and O Hara S.C.M. (1984) Copepod faecal pellets as a source of dihydrophytol in marine sediments. Science 224, 1235-1237. [Pg.646]

Appendicularians Megalocercus huxleyi (Ritter) sp. small colony in situ faecal pellet Gorsky et al. (1999)... [Pg.152]

Bulk fluxes of Vertical flux of TEP, Faecal pellet export... [Pg.232]

Urban-Rich J, Nordby E, Andreassen H, Wassmann P (1999) Contribution by mesozooplankton faecal pellets to the carbon flux on Nordvestbanken, North Norwegian shelf 1994. Sarsia 84 253-264 Veldhuis MJW, Wassmann P (2005) Bloom dynamics and biological control of a high biomass HAB species in European coastal waters a Phaeocystis case study. Harmful Algae 4 805-809... [Pg.234]

We hypothesize therefore that the observed low 234Th flux in traps is associated to the composition of settling material. Faecal pellets did not dominate the vertical export in April 1997 in fact phytoplankton, mainly diatoms and Phaeocystis, comprised a major fraction of the sinking particles (Reigstad et al. 2000). The high PPC (total phytoplankton carbon)/POC ratios... [Pg.241]

Jg column with DMS + DMSPd production of ingested DMSP, notations in brackets refer to release of DMSP repacked into faecal pellets... [Pg.260]

Kwint et al. 1996 (20% of ingested DMSP was released as DMSPd 80% as DMSPp in faecal pellets)... [Pg.261]

The faecal pellets of the bark beetle Ips paraconfusus which had fed on the phloem of Pinus ponderosa contained large quantities of the aggregation pheromones cis-verbenol (24), ipsenol (25), and ipsdienol (26). The pheromones originate in the hindgut, but, although there is a precursor-product correlation between a-pinene or myrcene from the phloem and the pheromone terpenoids, the biosynthetic site is unclear. The demonstration68 of the conversion of a-pinene into cis- and trans-verbenol (27) by Bacillus cereus found in the gut of I. paraconfusus has led to the... [Pg.179]

Anderson, T. R. (1994). Relating C N ratios in zooplankton food and faecal pellets using a biochemical model. J. Exp. Mar. Biol. Ecol. 184, 183—199. [Pg.1182]

Morales, C. E. (1987). Carbon and nitrogen content of copepod faecal pellets Effect of food concentration and feeding behavior. Mar. Ecol. Prog. Ser. 36, 107—114. [Pg.1191]

Poulet, S. A., Harris, R. P., Martin-Jezequel, V., Moal, J., and Samain, J.-F. (1986). Free amino acids in copepod faecal pellets. Oceanol. Acta 9(2), 191—197. [Pg.1193]

Carbonate particles embedded in the faecal pellets of planktonic crustaceans are protected from dissolution by an organic capsule. This mechanism is lEirgely responsible for the presence of remains of calcareous nannoplemk-ton in deep ocean sediments below the compensation level for carbonate (Honjo, 1976). Similarly, carbonate particles suspended in sea water are apparently coated by a layer of organic matter. After this layer is experimentally removed by a strong oxidant (e.g. hypochlorite or H2O2), the rate of carbonate dissolution increases significantly (Chave and Suess, 1967,... [Pg.110]

Destruction of carbonates by organisms also involves translocation of material from the site of biological corrosion or abrasion, and its redistribution in the environment. Carbonate particles which are mechanically removed by gastropods and echinoderms are transported through their digestive tracts and distributed via faecal pellets. Sponges remove the chips of car-... [Pg.110]

Schrader, H.J., 1971. Faecal pellets role in sedimentation of pelagic diatoms. Science, 174 55-57. [Pg.482]

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