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• W2062207946 abstract "Curie-point pyrolysis mass spectrometry (pyMs) was used as analytical technique to analyse the organic matter from sediments. Mass pyrograms (fingerprints of sedimentary organic matter) were obtained from sediments, faecal pellets and blue-green algae of an experimental laboratory scale marine benthic ecosystem, designed from the study of the effects of bioturbation by Arenicola marina on marine biota. A decomposition of surface sediment was performed under aerobic and anaerobic conditions in order to compare the organic matter in the decomposition stages, as shown by pyMs, with the compositions found in the ecosystem. The upper mm of the surface sediment showed many pyrolysis products of proteins, polysaccharides and N-acetyl-amino sugars derived from the algal matter. Lower layers showed a composition intermediate between those found in the aerobic and anaerobic decomposition experiment. The organic matter in the aerobic decomposition experiment is characterized by a series of alkenes, benzenes and furan derivatives as pyrolysis products. The mass pyrogram of faecal pellets and of sediment digested by Arenicola for long periods of time is similar to the one of aerobic microbial decomposition after 6 weeks. The relative intensity of the furan series in the mass pyrogram of a sediment appears to be a measure of the low food value of the sedimentary organic matter for deposit feeders. Two types of Arenicola burrow systems—a relatively slow and a rapid sediment recycling system—were compared by pyMs. The burrow system with a rapid recycling of sediment was characterized by pyrolysis products of predominantly stable furan generating organic matter and of proteins. Almost no difference is seen between the mass pyrograms of funnel sediment, burrow sediments and faeces. The high feeding rate is thought to be related to the relatively poor quality of the sedimentary organic matter. The many pyrolysis fragments of biopolymers in the valleys caused by the slow recycling burrow and their diminuation in the burrow sediments points to processes of microbial digestion before ingestion by the worm. The faeces is depleted even more in biopolymers, and the furan type organic matter becomes predominant. It is concluded that the slow pace of food ingestion points to an ample supply of digestable organic matter for the adult worm." @default.
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• W2062207946 date "1979-12-01" @default.
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• W2062207946 title "Pyrolysis mass spectrometry of a benthic marine ecosystem—the influence of Arenicola marina on the organic matter cycle" @default.
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• W2062207946 doi "https://doi.org/10.1016/0077-7579(79)90018-8" @default.
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