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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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one publication added to basket [250698]

On the distribution and population dynamics of the ctenophore Mnemiopsis leidyi in the Belgian part of the North Sea and Westerschelde estuary Vansteenbrugge, L.; Ampe, B.; De Troch, M.; Vincx, M.; Hostens, K. (2015). On the distribution and population dynamics of the ctenophore Mnemiopsis leidyi in the Belgian part of the North Sea and Westerschelde estuary. Mar. Environ. Res. 110: 33-44. http://dx.doi.org/10.1016/j.marenvres.2015.07.011 In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 278646 [ download pdf ]

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Trefwoorden

Ports Taxa > Species > Introduced species Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries Mnemiopsis leidyi A. Agassiz, 1865 [WoRMS] ANE, België [Marine Regions]; ANE, Nederland, Westerschelde [Marine Regions] Marien/Kust; Brak water

Author keywords

Southern North Sea; Source-sink dynamics; Environmental drivers

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Auteurs		Top
Vansteenbrugge, L., meer Ampe, B., meer De Troch, M., meer	Vincx, M., meer Hostens, K., meer

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Abstract

The spatio-temporal distribution and population dynamics of the non-indigenous ctenophore Mnemiopsis leidyi A. Agassiz 1865 were investigated through monthly and quarterly surveys in 2011–2012 at several locations in the Belgian part of the North Sea, the main coastal ports and the adjacent Westerschelde estuary. M. leidyi occurred from August to December, but was never found more than 30 km offshore. Densities were generally low (average 0.8 ± SD 2.8 ind m-3) compared to other invaded European systems. Highest densities of M. leidyi were found in the semi-enclosed basin (port of Oostende; 18.4 ind m-3) and Westerschelde estuary (1.9 ind m-3). The presence of larvae and sudden appearance of high numbers across the size distribution in August indicated that ports and estuaries may act as sources, populating the adjacent coastal area. The zero-inflated logistic regression model showed that there is a higher chance of finding M. leidyi (presence) when temperature declines from late summer onwards. Combined with a negative binomial regression, our model suggests that increasing M. leidyi densities are associated with decreasing autumn temperatures, low wave height (low energetic systems) and low dissolved oxygen concentrations Although densities remained relatively low since its first appearance in 2007, a permanent population seems to be established in Belgian waters. As population outbursts may occur with only a small change in environmental parameters, further monitoring of this notorious invasive species is recommended.

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