Lezama-Ochoa A. auteur aut IRD Grados D. auteur aut IRD Lebourges Dhaussy Anne auteur aut IRD Irigoien X. auteur aut IRD Chaigneau Alexis auteur aut IRD Bertrand Arnaud auteur aut IRD text journalArticle eng text/pdf born digital access In the present study we investigated the biogeography of macrozooplankton and fish biomass in the Bay of Biscay. In this region, we defined six different landscapes based on the hydrogeographical characteristics observed in spring 2009. We then related landscape's characteristics and environmental parameters such as light attenuation depth and chlorophyll-a with macrozooplankton and fish acoustic biomass. Hydrodynamic structures together with coastal influences (river discharges, predation pressure and depth preference) and vertical thermohaline structure/mixing (feeding modes and ability to stay in preferred layers) appeared as the main factors determining the biological distribution. Besides, variance partitioning was used to assess the respective roles played by the hydrological environment, the geographical space and the biological environment alone, and their interactions. Results revealed that: (i) macrozooplankton and fish have a preference for different hydrogeographical landscapes; (ii) the association between hydrological conditions and geographical features, i.e. the spatial structure of the hydrological environment, plays a key role in the distribution of macrozooplankton; and (iii) prey-predator relationships have to be taken into account to provide a comprehensive characterization of habitat suitability. specialized acoustics Bay of Biscay biogeography fish horizontal distribution patterns hydrological structures macrozooplankton ATLANTIQUE NORD BISCAYE BAIE 032 036 24 1 26-41 2015 1054-6006 https://www.documentation.ird.fr/hor/fdi:010063896 10.1111/fog.12090 1054-6006 [F B010063896] https://www.documentation.ird.fr/hor/fdi:010063896 https://www.documentation.ird.fr/intranet/publi/2015/03/010063896.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-04-07 2017-08-23 fdi:010063896 fre