Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale. Dubois, S., Savoye, N., Grémare, A., Plus, M., Charlier, K., Beltoise, A., & Blanchet, H. 94:64–73. ![Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay – a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe – using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of macroalgae. There was no evidence of anthropogenic N-sources and SOM was mainly of autochthonous origin. None of the tested environmental parameters – salinity, current speed, emersion, granulometry and chlorophyll a – nor a combination of them explained the low spatial variability of SOM composition and characteristics. Resuspension, mixing and redistribution of the different particulate organic matters by wind-induced and tidal currents in combination with shallow depth probably explain the observed homogeneity at the whole bay scale.
@article{dubois_origin_2012,
title = {Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale},
volume = {94},
issn = {0924-7963},
url = {http://www.sciencedirect.com/science/article/pii/S0924796311002399},
doi = {10.1016/j.jmarsys.2011.10.009},
shorttitle = {Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem},
abstract = {The origin and composition of sediment organic matter ({SOM}) were investigated together with its spatial distribution in the Arcachon Bay – a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe – using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to {SOM} were estimated using a mixing model. The {SOM} composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, {SOM} was composed of 25\% of decayed phanerogams, 19\% of microphytobenthos, 20\% of phytoplankton, 19\% of river {SPOM} and 17\% of macroalgae. There was no evidence of anthropogenic N-sources and {SOM} was mainly of autochthonous origin. None of the tested environmental parameters – salinity, current speed, emersion, granulometry and chlorophyll a – nor a combination of them explained the low spatial variability of {SOM} composition and characteristics. Resuspension, mixing and redistribution of the different particulate organic matters by wind-induced and tidal currents in combination with shallow depth probably explain the observed homogeneity at the whole bay scale.},
pages = {64--73},
journaltitle = {Journal of Marine Systems},
shortjournal = {Journal of Marine Systems},
author = {Dubois, S. and Savoye, N. and Grémare, A. and Plus, M. and Charlier, K. and Beltoise, A. and Blanchet, H.},
urldate = {2019-04-16},
date = {2012-06-01},
keywords = {C and N stable isotopes, Sediment organic matter, Arcachon Bay, Primary producers}
}
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Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to {SOM} were estimated using a mixing model. The {SOM} composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, {SOM} was composed of 25\\% of decayed phanerogams, 19\\% of microphytobenthos, 20\\% of phytoplankton, 19\\% of river {SPOM} and 17\\% of macroalgae. There was no evidence of anthropogenic N-sources and {SOM} was mainly of autochthonous origin. None of the tested environmental parameters – salinity, current speed, emersion, granulometry and chlorophyll a – nor a combination of them explained the low spatial variability of {SOM} composition and characteristics. 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