Salvetat Julie, Bez Nicolas, Habasque Jérémie, Lebourges Dhaussy Anne, Lopes C., Roudaut Gildas, Simier Monique, Travassos P., Vargas G., Bertrand Arnaud. (2022). Comprehensive spatial distribution of tropical fish assemblages from multifrequency acoustics and video fulfils the island mass effect framework. Scientific Reports - Nature, 12 (1), 8787 [24 p.]. ISSN 2045-2322.
Titre du document
Comprehensive spatial distribution of tropical fish assemblages from multifrequency acoustics and video fulfils the island mass effect framework
Année de publication
Salvetat Julie, Bez Nicolas, Habasque Jérémie, Lebourges Dhaussy Anne, Lopes C., Roudaut Gildas, Simier Monique, Travassos P., Vargas G., Bertrand Arnaud
Scientific Reports - Nature, 2022,
12 (1), 8787 [24 p.] ISSN 2045-2322
Tropical marine ecosystems are highly biodiverse and provide resources for small-scale fisheries and tourism. However, precise information on fish spatial distribution is lacking, which limits our ability to reconcile exploitation and conservation. We combined acoustics to video observations to provide a comprehensive description of fish distribution in a typical tropical environment, the Fernando de Noronha Archipelago (FNA) off Northeast Brazil. We identified and classified all acoustic echoes into ten fish assemblage and two triggerfish species. This opened up the possibility to relate the different spatial patterns to a series of environmental factors and the level of protection. We provide the first biomass estimation of the black triggerfish Melichthys niger, a key tropical player. By comparing the effects of euphotic and mesophotic reefs we show that more than the depth, the most important feature is the topography with the shelf-break as the most important hotspot. We also complete the portrait of the island mass effect revealing a clear spatial dissymmetry regarding fish distribution. Indeed, while primary productivity is higher downstream, fish concentrate upstream. The comprehensive fish distribution provided by our approach is directly usable to implement scientific-grounded Marine Spatial Planning.
Plan de classement
Limnologie biologique / Océanographie biologique 
Ecologie, systèmes aquatiques 
ATLANTIQUE ; BRESIL ; ZONE TROPICALE
Fonds IRD [F B010085184]