Delivery and deposition of organic matter in surface sediments of Lagoa do Caçó (Brazil)
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...A number of studies have demonstrated that TOC in small and shallow lakes are attributable to allochthonous sources, but TOC in larger25 and deeper lakes to autochthonous sources that are derived from planktonic organisms (Shanahan et al., 2013; Sifeddine et al., 2011; Barnes and Barnes, 1978)....
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...There is evidence of littoral sources of TOC in small and shallow lakes, but autochthonous sources, derived from planktonic organisms, in larger and deeper lakes, especially fjord lakes (Shanahan et al., 2013; Sifeddine et al., 2011; Barnes and Barnes, 1978)....
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...…Discussion D iscussion P aper | D iscussion P aper | D iscussion P aper | D iscussion P aper | The magnitudes and spatial distribution of TOC in lake sediment may reflect multiple, complex processes (Sifeddine et al., 2011; Woszczyk et al., 2011; Dunn et al., 2008; Wang et al., 2012)....
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...For example, aqueous organic matters have low C : N ratios (4–10) (Meyers, 2003) whereas vascular land plants have much higher C : N ratios (> 20) (Rumolo et al., 2011; Lamb et al., 2004; Sifeddine et al., 2011)....
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...…been analyzed to document paleoclimate variability, including ice cores (e.g. Thompson et al., 2013), lake sediments (e.g. Cordeiro et al., 2011; Sifeddine et al., 2011), tree rings (e.g. Brienen et al., 2012; Ferrero et al., 2015) and marine cores (e.g. Haug et al., 2003; Chiessi et al., 2009)....
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..., 2013), lake sediments (e.g. Cordeiro et al., 2011; Sifeddine et al., 2011), tree rings (e....
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30 citations
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...The differences in surface sediment OM elemental and isotopic composition among the depth related zones in this lake (Sifeddine et al., 2011) suggest that changes in lake level can leave an imprint on the sediment record....
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"Delivery and deposition of organic ..." refers background in this paper
...Protein-rich algal organic matter has molar C/N values that are usually between 4 and 8, whereas vascular land plants, which are cellulose-rich and protein-poor, commonly create organic matter that has C/N ratios of 20 and more (Meyers 1994; Meyers and Teranes 2001)....
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