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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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Top-down impact of bacterivorous nematodes on the bacterial community structure: a microcosm study De Mesel, I.G.; Derycke, S.; Moens, T.; Van der Gucht, K.; Vincx, M.; Swings, J. (2004). Top-down impact of bacterivorous nematodes on the bacterial community structure: a microcosm study, in: De Mesel, I.G. Nematoden geassocieerd met fytodetritus in schorren: kolonisatiepatronen en soort- en diversiteitsafhankelijke invloed op afbraakprocessen = Nematodes associated with phytodetritus in salt marshes: colonization patterns and species- and diversity related impacts on decomposition processes. pp. 32-52 In: De Mesel, I.G. (2004). Nematoden geassocieerd met fytodetritus in schorren: kolonisatiepatronen en soort- en diversiteitsafhankelijke invloed op afbraakprocessen = Nematodes associated with phytodetritus in salt marshes: colonization patterns and species- and diversity related impacts on decomposition processes. PhD Thesis. Universiteit Gent, Vakgroep Biologie: Gent. 140 pp., meer Is gerelateerd aan: De Mesel, I.G.; Derycke, S.; Moens, T.; Van der Gucht, K.; Vincx, M.; Swings, J. (2004). Top-down impact of bacterivorous nematodes on the bacterial community structure: a microcosm study. Environ. Microbiol. 6(7): 733-744. http://dx.doi.org/10.1111/j.1462-2920.2004.00610.x, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 273819 [ download pdf ]

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Trefwoorden

Biology > Microbiology Ecology > Microbial ecology Microorganisms > Bacteria Nematoda [WoRMS] Marien/Kust

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Auteurs		Top
De Mesel, I.G., meer Derycke, S., meer Moens, T., meer	Van der Gucht, K. Vincx, M., meer Swings, J., meer

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Abstract

The influence of bacterivorous nematodes (Diplolaimelloides meyli, Diplolaimelloides oschei, Diplolaimella dievengatensis, Panagrolaimus paetzoldi) on the development of a bacterial community growing on decaying cordgrass detritus was studied in laboratory microcosm experiments. Cordgrass leaves were incubated on a sediment surface with a natural bacterial mixture containing bacteria from sediment, cordgrass detritus and habitat water. The four nematode species were applied separately to the microcosms; controls remained without nematodes. Samples were taken seven times over a 65-day period. The bacterial community structure was analysed by means of DGGE of the 16S rRNA genes. Multi Dimensional Scaling showed grouping of the samples per treatment. Analysis of Similarities indicated that the differences between treatments were significantly larger than differences within treatments. Our results suggest that nematodes can have a significant structuring top-down influence on the ‘pool’ of bacteria growing on the detritus, even at low densities. Dissimilarities were similar between all treatments. Differences in bacterial community composition within the treatments with monhysterids (D. meyli, D. oschei and D. dievengatensis) can be explained by species-specific food preferences. Panagrolaimus paetzoldi on the other hand feeds unselectively, and thus affects the bacterial community differently. A top-down effect of the nematodes on the diversity of the bacterial community was only evident under high grazing pressure, i.e. in the presence of P. paetzoldi.

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