Small-scale spatial and temporal interactions among benthic crustaceans and one fish species in the Bay of Biscay
|Author(s)||Trenkel Verena1, Le Loch Francois2, 3, Rochet Marie-Joelle1|
|Affiliation(s)||1 : IFREMER, Dept EMH, F-44311 Nantes 03, France.
2 : IUEM, UBO, LEMAR, UMR 6539 CNRS, F-29280 Plouzane, France.
3 : Ctr Rech Halieut, IRD, UR 070 RAP, F-34203 Sete, France.
|Source||Marine Biology (0025-3162) (Springer), 2007-07 , Vol. 151 , N. 6 , P. 2207-2215|
|WOS© Times Cited||17|
|Keyword(s)||Competition, Variations in activity patterns, Video, Benthos|
|Abstract||In the summer of 2004, a video survey was carried out in the northern part of the central mud bank (Grande Vasiere) of the Bay of Biscay to study the small scale relationship between the dominant crustacean megafauna Nephrops norvegicus, Munida rugosa and Goneplax rhomboides and juvenile hake (Merluccius merluccius). Using a towed body, high-resolution videos were recorded in six sampling sites. Statistical modelling using generalised additive models (GAM) revealed variations in activity patterns for two species. More N. norvegicus were observed outside their burrows at dawn and somewhat at dusk (no observations during night) while G. rhomboides was less observed in the morning. In addition, reduced spatial overlap between G. rhomboides and N. norvegicus suggested reduced competition for food but also space as both are burrowing species. The observed temporal and spatial activity patterns may contribute to regulating assemblage structure as competing species may be actively foraging at different times and locations thus reducing direct competition.|