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Biodiversity of settled material in a sediment trap in the Gulf of Trieste (northern Adriatic Sea)
Cibic, T.; Blasutto, O.; Fonda-Umani, S. (2007). Biodiversity of settled material in a sediment trap in the Gulf of Trieste (northern Adriatic Sea), in: Relini, G. et al. Biodiversity in Enclosed Seas and Artificial Marine Habitats: Proceedings of the 39th European Marine Biology Symposium, held in Genoa, Italy, 21-24 July 2004. Developments in Hydrobiology, 193: pp. 57-75
In: Relini, G.; Ryland, J. (Ed.) (2007). Biodiversity in Enclosed Seas and Artificial Marine Habitats: Proceedings of the 39th European Marine Biology Symposium, held in Genoa, Italy, 21-24 July 2004. Developments in Hydrobiology, 193. European Marine Biology Symposia, 39. ISBN 978-1-4020-6155-4. 271 pp. https://hdl.handle.net/10.1007/978-1-4020-6156-1, meer
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, meer

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Trefwoorden
    Algae > Diatoms
    Aquatic communities > Benthos
    Aquatic communities > Plankton > Phytoplankton
    Biodiversity
    Sediment traps
    Chaetoceros C.G. Ehrenberg, 1844 [WoRMS]; Paralia sulcata (Ehrenberg) Cleve, 1873 [WoRMS]; Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899 [WoRMS]
    MED, Trieste Gulf [Marine Regions]
    Marien
Author keywords
    sediment trap; biodiversity; benthic diatoms; phytoplankton; Gulf ofTrieste

Auteurs  Top 
  • Cibic, T.
  • Blasutto, O.
  • Fonda-Umani, S.

Abstract
    Phytoplankton succession and sinking rates were studied from January to December 2003 at a coastal station in the Gulf of Trieste (northern Adriatic Sea), 200 m offshore, in a relatively undisturbed area. A conical sediment trap, moored at 15 m depth (water depth 17 m), was used. The hypothesis if the presence of benthic and epiphytic diatoms can lead to an overestimation of the vertical fluxes was tested. To evaluate primary and secondary sedimentation contributions, planktonic, benthic and epiphytic diatoms were distinguished. Benthic species abundance varied throughout the year and it was related to resuspension that strongly influenced sinking rates. All over the year, diatoms were the prevailing class in the trap material accounting for 75.32% of the settled cells, while flagellates represented 24.11%. Dinophyceae and resting cells constituted minor components, accounting for 0.43% and 0.14%, respectively. The gross sedimentation rates ranged from 0.006 × 108 cell m-2 d-1 in the second week of May to 6.30 × 108 cell m-2d-1 in the third week of January with a mean annual value of 1.09 ± 1.43 × 108 cell m-2 d-1. To the primary sedimentation rate Pseudo-nitzschia seriata of the group "Nitzschia seriata complex" contributed for 49.77% followed by Chaetoceros spp. (23.88%). The major contributor to the secondary sedimentation rate was the diatom Paralia sulcata, accounting for 24.76%. Epiphytic diatoms contributed for 11.19% and 12.27% on annual average gross abundance and biomass, respectively, reaching even 72.04% of gross abundance and 56.06% of gross biomass in the second week of August. The correlation between temperature and the logarithm of the epiphytic biomass was statistically significant, with r = 0.66 and P < 0.001. Both in the cluster analysis and in the PCA four main groups were formed, where benthic and epiphytic species were separately gathered. Planktonic, benthic and epiphytic forms accounted for 50.78%, 36.95% and 12.27%, respectively, calculated on the annual average biomass. Therefore, vertical fluxes can be overestimated of 50% or more if benthic and epiphytic species are not rejected.

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