Experimental degradation of plant materials in Hudson river sediments |
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| Authors: | Thomas S. Bianchi Stuart Findlay Dominique Fontvieille |
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| Affiliation: | (1) Institute of Ecosystem Studies, The New York Botanical Garden, 12545 Millbrook, New York, USA;(2) Department de Biologie-Ecologie, Universite de Savoie, Chambery, France;(3) Present address: Department of Biology, Lamar University, 77710 Beaumont, Texas, USA |
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| Abstract: | We examined photopigment degradation and transformation in sediment microcosms that received different detrital source materials (planktonic, littoral, terrestrial) in the presence or absence of amphidpods (Gammarus sp.). Additions of realistic quantities of particulate organic matter resulted in detectable changes in pigment concentration and composition despite insignificant changes in total organic matter. The transformation of chlorophyll a to total phaeophorbide was significantly higher in all high quality (high nitrogen) detritus treatments containing amphipods. The highest production of phaeophorbide was in the higher quality detritus (blue-green algae, Anabaena cylindrica, and macrophyte, Vallisneria americana) when compared to red maple (Acer rubrum). Phaeophytin formation was not related to amphipod grazing and thus may be determined more by microbial heterotrophic processes. The degradation product of the carotenoid lutein, lutein 5,6 expoxide, was formed in all treatments. Phaeopigment composition can be used to infer differences in heterotrophic activity and will help in the interpretation of photopigment distribution in field samples. |
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| Keywords: | bio-marker carotenoid chlorophyll detritrivore detritus phaeopigments |
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