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Particulate organic matter distribution along the lower Amazon River: addressing aquatic ecology concepts using fatty acids

Mortillaro, Jean-Michel ; Rigal, François ; Rybarczyk, Hervé ; Bernardes, Marcelo ; Abril, Gwenaël ; Meziane, Tarik Stal, Lucas J.

PloS one, 2012-09, Vol.7 (9), p.e46141-e46141 [同儕審閱期刊]

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題名:
Particulate organic matter distribution along the lower Amazon River: addressing aquatic ecology concepts using fatty acids
著者: Mortillaro, Jean-Michel ; Rigal, François ; Rybarczyk, Hervé ; Bernardes, Marcelo ; Abril, Gwenaël ; Meziane, Tarik
Stal, Lucas J.
主題: Analysis ; Aquatic ecology ; Aquatic ecosystems ; Aquatic plants ; Biodiversity and Ecology ; Biology ; Carbon ; Chemical properties ; Chlorophyll ; Cyanobacteria ; Downstream ; Earth Sciences ; Ecology ; Ecosystem ; Emergency preparedness ; Environmental aspects ; Environmental changes ; Environmental Sciences ; Fatty acids ; Fatty Acids - analysis ; Flood predictions ; Floodplains ; Floods ; Geomorphology ; Humic Substances - analysis ; Hydrobiology ; Limnology ; Marine ecology ; Oceanography ; Organic matter ; Particulate organic matter ; Primary production ; Quality ; River basins ; River ecology ; Rivers ; Rivers - chemistry ; Seasons ; Sedimentation & deposition ; Spatial distribution ; Statistical analysis ; Upstream ; Water levels ; Wetlands
所屬期刊: PloS one, 2012-09, Vol.7 (9), p.e46141-e46141
描述: One of the greatest challenges in understanding the Amazon basin functioning is to ascertain the role played by floodplains in the organic matter (OM) cycle, crucial for a large spectrum of ecological mechanisms. Fatty acids (FAs) were combined with environmental descriptors and analyzed through multivariate and spatial tools (asymmetric eigenvector maps, AEM and principal coordinates of neighbor matrices, PCNM). This challenge allowed investigating the distribution of suspended particulate organic matter (SPOM), in order to trace its seasonal origin and quality, along a 800 km section of the Amazon river-floodplain system. Statistical analysis confirmed that large amounts of saturated FAs (15:0, 18:0, 24:0, 25:0 and 26:0), an indication of refractory OM, were concomitantly recorded with high pCO(2) in rivers, during the high water season (HW). Contrastingly, FAs marker which may be attributed in this ecosystem to aquatic plants (18:2ω6 and 18:3ω3) and cyanobacteria (16:1ω7), were correlated with higher O(2), chlorophyll a and pheopigments in floodplains, due to a high primary production during low waters (LW). Decreasing concentrations of unsaturated FAs, that characterize labile OM, were recorded during HW, from upstream to downstream. Furthermore, using PCNM and AEM spatial methods, FAs compositions of SPOM displayed an upstream-downstream gradient during HW, which was attributed to OM retention and the extent of flooded forest in floodplains. Discrimination of OM quality between the Amazon River and floodplains corroborate higher autotrophic production in the latter and transfer of OM to rivers at LW season. Together, these gradients demonstrate the validity of FAs as predictors of spatial and temporal changes in OM quality. These spatial and temporal trends are explained by 1) downstream change in landscape morphology as predicted by the River Continuum Concept; 2) enhanced primary production during LW when the water level decreased and its residence time increased as predicted by the Flood Pulse Concept.
出版者: United States: Public Library of Science
語言: 英文
識別號: ISSN: 1932-6203
EISSN: 1932-6203
DOI: 10.1371/journal.pone.0046141
PMID: 23029412
資源來源: Publicly Available Content Database
Academic Search Premier
Agricultural & Environmental Science Collection
DOAJ Directory of Open Access Journals

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Particulate organic matter distribution along the lower Amazon River: addressing aquatic ecology concepts using fatty acids

Mortillaro, Jean-Michel ; Rigal, François ; Rybarczyk, Hervé ; Bernardes, Marcelo ; Abril, Gwenaël ; Meziane, Tarik Stal, Lucas J.

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