Comprehensive spatial distribution of tropical fish assemblages from multifrequency acoustics and video fulfils the island mass effect framework

Type Article
Date 2022-05
Language English
Author(s) Salvetat Julie1, Bez Nicolas2, Habasque Jeremie2, Lebourges-Dhaussy Anne2, Lopez Cristiano1, Roudaut Gildas2, Simier Monique2, Travassos Paulo1, Vargas Gary1, Bertrand Arnaud2
Affiliation(s) 1 : Univ Fed Rural Pernambuco, Posgrad Recursos Pesqueiros & Aquicultura, Rua Dom Manoel de Medeiros S-N, BR-52171900 Recife, PE, Brazil
2 : Univ Montpellier, MARBEC, CNRS, IRD,Ifremer, Sete, France
3 : Institut de Recherche pour le Développement, France
4 : LEMAR UBO CNRS IRD Ifremer, IRD, Plouzane, France
5 : Univ Fed Pernambuco, Lab Oceanog Fis Estuarina & Costeira, Dept Oceanog, Ave Prof Moraes Rego,1235 Cidade Univ, BR-50670901 Recife, PE, Brazil
Source Scientific Reports (2045-2322) (Nature Research), 2022-05 , Vol. 12 , N. 1 , P. 8787 (24p.)
DOI 10.1038/s41598-022-12409-9
WOS© Times Cited 4

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 spatial 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 asymmetry. 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.

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Salvetat Julie, Bez Nicolas, Habasque Jeremie, Lebourges-Dhaussy Anne, Lopez Cristiano, Roudaut Gildas, Simier Monique, Travassos Paulo, Vargas Gary, Bertrand Arnaud (2022). Comprehensive spatial distribution of tropical fish assemblages from multifrequency acoustics and video fulfils the island mass effect framework. Scientific Reports, 12(1), 8787 (24p.). Publisher's official version : , Open Access version :