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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Degradation of the Adriatic medusa Aurelia sp. by ambient bacteria Tinta, T.; Malej, A.; Kos, M.; Turk, V. (2010). Degradation of the Adriatic medusa Aurelia sp. by ambient bacteria, in: Purcell, J.E. et al. Jellyfish blooms: New problems and solutions. Developments in Hydrobiology, 212: pp. 179-191. https://dx.doi.org/10.1007/978-90-481-9541-1_14 In: Purcell, J.E.; Angel, D.L. (Ed.) (2010). Jellyfish blooms: New problems and solutions. Developments in Hydrobiology, 212. Springer: Dordrecht. ISBN 978-90-481-9540-4; e-ISBN 978-90-481-9541-1. 234 pp. https://dx.doi.org/10.1007/978-90-481-9541-1, meer In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, meer Is gerelateerd aan: Tinta, T.; Malej, A.; Kos, M.; Turk, V. (2010). Degradation of the Adriatic medusa Aurelia sp. by ambient bacteria. Hydrobiologia 645(1): 179-191. https://dx.doi.org/10.1007/s10750-010-0223-x, meer

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Tinta, T. Malej, A., meer Kos, M. Turk, V., meer

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Abstract

The decomposition of jellyfish after major bloom events results in the release of large amounts of nutrients, which can significantly alter nutrient and oxygen dynamics in the surrounding environment. The response of the ambient bacterial community to decomposing jellyfish biomass was evaluated in two marine ecosystems, the Gulf of Trieste (northern Adriatic Sea) and Big Lake (Mljet Island, southern Adriatic Sea). The major difference between these two ecosystems is that Aurelia sp. medusae occur throughout the year in the oligotrophic Big Lake, whereas in the mesotrophic Gulf of Trieste, they occur only seasonally and often as blooms. Addition of homogenized jellyfish to enclosed bottles containing ambient water from each of these systems triggered considerable changes in the bacterial community dynamics and in the nutrient regime. The high concentrations of protein, dissolved organic phosphorous (DOP), and PO4 3− immediately after homogenate addition stimulated increase in bacterial abundance and production rate, coupled with NH4 + accumulation in both ecosystems. Our preliminary results of the bacterial community structure, as determined with denaturing gradient gel electrophoresis, indicated differences in the bacterial community response between the two ecosystems. Despite divergence in the bacterial community responses to jellyfish homogenate, increased bacterial biomass and growth rates in both distinctive marine systems indicate potentially significant effects of decaying jellyfish blooms on microbial plankton.

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