Reference : Spatial and interannual variability of the Schyphozoan medusae, Pelagia noctiluca (Fo...
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/94501
Spatial and interannual variability of the Schyphozoan medusae, Pelagia noctiluca (Forksål), in the Bay of Calvi (Corsica)
English
Collignon, Amandine mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie >]
Goffart, Anne mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie >]
Lejeune, Pierre [ > > ]
Penot, Florian [ > > ]
Defreyne, Pierre-Simon [ > > ]
Hecq, Jean-Henri mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie >]
Oct-2008
No
No
International
15th Benelux Congress of Zoology
du 30 au 31 octobre 2008
Liège
Belgique
[en] Pelagia noctiluca ; STARESO ; Spatial variability ; Temporal variability ; Western Mediterranean
[en] The temporal distribution of the Schyphozoan medusae Pelagia noctiluca (Forksål) has been examined weekly in the oligotrophic coastal waters of the Bay of Calvi (Corsica) from 2003 to 2008. The observations show a gradual increase of jellyfish number in 2004 to 2005, followed by a dramatic increase in the 2006 and a significant reduction in summers 2007 and 2008. The numeration of ephyra larvae in plankton and ovarian histology show a higher reproduction in June 2006.
An analysis of the spatial distribution of the Pelagia noctiluca in the area of the Bay of Calvi emphasises that during the 2006 bloom, most of the organisms are present at a distance of the coastline where they are forming actives swarms of 200 m of length with 5 to 10 individual per m3. In the swarms, the individuals are healthful and swim actively in the upper layer (10 t 60 m) with tentacles extended, probably catching the food. The swarms are generally located around wind-protected area where the surface turbulence is reduced and where zooplankton is accumulating. Sometimes, the swarms migrate vertically probably in relation with changes of wind conditions.
In some cases, moribund individuals partially destroyed or at the end of their biological cycle escape from active swarms and drift passively, at the surface, under the action of water movements, into coastal waters and beaches where they accumulate and reach 200 individual per m3. In these passive swarms the individuals continue to swim slowly but are actively fed by some Sparid fish.
Centre Interfacultaire de Recherches en Océanologie - MARE ; STARESO
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Agence de l'Eau RMC, France
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/94501

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