Spatial and temporal dynamics of nano- and pico-size particulate organic matter (POM) in a coastal megatidal marine system

Surface water samples of size-selected seston (0.7–20 μm) were collected from April 2013 to September 2013 at three similar coarse-sand benthic habitats. Additionally, seston sampling was performed at a fixed location throughout a complete tidal cycle (2014). A combination of fatty acid (FA), isotop...

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Bibliographic Details
Published in:Limnology and oceanography 2016-05, Vol.61 (3), p.1087-1100
Main Authors: Moynihan, Molly A., Barbier, Pierrick, Olivier, Frédéric, Toupoint, Nicolas, Meziane, Tarik
Format: Article
Language:English
Subjects:
Biodiversity and Ecology
Continental interfaces, environment
Ecology, environment
Environmental Sciences
Global Changes
Life Sciences
Marine
Sciences of the Universe
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Summary:Surface water samples of size-selected seston (0.7–20 μm) were collected from April 2013 to September 2013 at three similar coarse-sand benthic habitats. Additionally, seston sampling was performed at a fixed location throughout a complete tidal cycle (2014). A combination of fatty acid (FA), isotope, and flow cytometry analyses were used to determine the quality and quantity of nano- and pico-sized particulate organic matter (POM). High variability was found between fatty acid replicate samples. Similar temporal patterns were observed at two sheltered sites, while the exposed site displayed less pronounced seasonal changes. Lower concentrations of 16C and 18C polyunsaturated fatty acids were found during low tide sampling. Globally, POM was dominated by picoeukaryotes, with concentrations exceeding 50,000 cells mL−1, and (16:4ω3 + 18:3ω3)/Σω3 is proposed as novel biomarker of picoeukaryotes in this region.
ISSN:0024-3590
1539-607X
1939-5590
1539-6088
DOI:10.1002/lno.10276