A positive correlation between sedimentary organic carbon and seagrass biomass has been reported from seagrass meadows in the western Indian Ocean (Gullström et al., 2018). Thus, we expected that the organic carbon content of the sediment would be highest in monospecific seagrass areas. It was however found that subplots with high or mid cover of seagrass mixed with calcareous algae had a significantly higher organic carbon content than the unmixed seagrass subplot. The presence of calcareous algae apparently enhanced sediment carbon storage even though the algae by themselves had a comparatively low organic carbon production. It is possible that the combination of different plant types creates a physically complex structure that will increase particulate organic matter trapping capacity, leading to an increase in the amount of organic carbon in the sediment. Structural complexity in seagrass meadows has been shown to affect organic matter sedimentation (Dahl et al., 2018), and complex macroalgal assemblages trap considerable amounts of sediments (Stamski & Field, 2006). It has also been found that in Tangkhen Bay, Thailand, Halimeda spp. plays an important role as a source of organic matter in sediment (Tuntiprapas et al., 2019).
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[98] Włodarska-Kowalczuk M., Jankowska E., Michel L. N., Zaborska A., Bałazy P. & Kotwicki L (2019). Benthic system functioning in low-density seagrass (Zostera marina) meadows (Baltic Sea). Oral communication presented at the "5th European Conference on Scientific Diving (ECSD5)", 24-27/04/2019, Sopot, Poland.
[33] Huyghebaert L., Acquarone M., Pinzone M., Jauniaux T., Siebert U., Sturaro N., Michel L. & Das K. (2015). Stable carbon, nitrogen and sulfur isotopic fractionation between diet and tissue of captive hooded seals, Cystophora cristata: implications for dietary reconstruction of wild individuals. Poster presented on 08/10/2015 at "Zoology 2015", Amsterdam, The Netherlands.
[30] Michel N., Wang H., Frédérich B., Lavitra T. & Lepoint G. (2015). Stable isotope ratios suggest limited trophic importance of seagrasses for invertebrate consumers from Malagasy tropical polyspecific seagrass meadows. Oral communication presented on 09/10/2015 at "Zoology 2015", Amsterdam, The Netherlands.
[29] Jankowska E. K., Włodarska-Kowalczuk M., Michel L. & Zaborska A. (2015). Baltic seagrass meadows as a sediment carbon sink. Oral communication presented on 25/09/2015 at the "50th European Marine Biology Symposium", Helgoland, Germany.
[27] Michel L. N., Frédérich B., Lavitra T. & Lepoint G. (2015). Use of C, N and S stable isotope ratios to highlight resource segregation among hermit crabs from tropical seagrass meadows. Poster presented on 26/03/2015 at the "9th Benelux Association of Stable Isotope Scientists (BASIS) symposium", Utrecht, The Netherlands. 2ff7e9595c
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