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Short-Term Photochemical and Biological Unreactivity of Macrophyte-Derived Dissolved Organic Matter in a Subtropical Shallow Lake
Joint Authors
They, Ng Haig
Marques, David Motta
Souza, Rafael Siqueira
Ribeiro Rodrigues, Lúcia
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-07-30
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Macrophytes have been associated with low bacterial metabolism in the littoral zones of lake Mangueira, but an explanation for this pattern is largely unknown.
In this study, macrophyte-derived DOM was incubated in situ for the measurement of the effect of grazers, bacteria, and light on its degradation in three experiments.
The water was separated in bulk, bacterial, and control (+ HgCl2) fractions and exposed to or hidden from sunlight for 120 h.
Unchange in bacterial variables in the bulk fraction suggested a combined control of radiation and grazing on bacteria.
Light treatment increased bacterial density but not biomass and biovolume, while bacterial density decreased in the dark.
Significant fading of water color in the bacterial fraction only occurred after light exposure, indicating a complementary pathway of light and bacteria.
DOC and the Abs250 : 365 ratio did not change with incubation, indicating no net change of DOC pool and reactivity.
Due to continuous carbon loading from macrophytes and low UV irradiance, the very low rates of DOM degradation provide the mechanistic explanation for the observed impacts of macrophytes in lake’s carbon metabolism in littoral zones.
American Psychological Association (APA)
They, Ng Haig& Marques, David Motta& Souza, Rafael Siqueira& Ribeiro Rodrigues, Lúcia. 2013. Short-Term Photochemical and Biological Unreactivity of Macrophyte-Derived Dissolved Organic Matter in a Subtropical Shallow Lake. Journal of Ecosystems،Vol. 2013, no. 2013, pp.1-9.
https://search.emarefa.net/detail/BIM-462926
Modern Language Association (MLA)
They, Ng Haig…[et al.]. Short-Term Photochemical and Biological Unreactivity of Macrophyte-Derived Dissolved Organic Matter in a Subtropical Shallow Lake. Journal of Ecosystems No. 2013 (2013), pp.1-9.
https://search.emarefa.net/detail/BIM-462926
American Medical Association (AMA)
They, Ng Haig& Marques, David Motta& Souza, Rafael Siqueira& Ribeiro Rodrigues, Lúcia. Short-Term Photochemical and Biological Unreactivity of Macrophyte-Derived Dissolved Organic Matter in a Subtropical Shallow Lake. Journal of Ecosystems. 2013. Vol. 2013, no. 2013, pp.1-9.
https://search.emarefa.net/detail/BIM-462926
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-462926