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Title: Understanding the 3D environment of pelagic predators from multidisciplinary oceanographic surveys to advance ecosystem-based monitoring
Authors: Louzao, Maite; Garcia-Baron, Isabel; Rubio, Anna; Martinez, Udane; Antonio Vazquez, Jose; Luis Murcia, Jose; Nogueira, Enrique; Boyra, Guillermo
Citation: MARINE ECOLOGY PROGRESS SERIES, 2019, 617, 199-219
Abstract: Marine predators move through the seascape searching for foraging resources. Prey configuration and oceanographic processes could therefore shape their 3-dimensional (3D) oceanographic habitats. Taking advantage of multidisciplinary oceanographic JUVENA surveys targeting biomass estimation of pelagic fishes, observations of 2 highly migratory pelagic seabirds were collected during line-transects: sooty shearwaters (SOSHs) Ardenna grisea and great shearwater (GRSHs) A. gravis. Every autumn these species visit the pelagic ecosystem of the Bay of Biscay (BoB). We developed generalised additive models to disentangle the effects of the 3D ocean environment and preyscapes at different depth ranges, in addition to static variables, on driving the spatial abundance of these predators. The species differed in their vertical habitat use, with SOSHs and GRSHs influenced by habitat conditions above the depth of the maximum temperature gradient and at the surface, respectively. SOSHs were more abundant in deeper shelf areas with localised hotspots associated with upwelling and river discharges. In contrast, GRSHs were more abundant in shallow slope areas in the outer BoB sectors, followed by less dense areas with intermediate levels of juvenile anchovy biomass. Therefore, both species integrate marine resources at different vertical and spatial dimensions, influenced by topographic features, oceanographic conditions and preyscapes. Relative abundance estimations provided mean values of 3203 SOSHs (95 \% CI: 1753-5748) and 12 380 GRSHs (95\% CI: 5797-28152) in the BoB during their annual migration; these numbers varied slightly inter-annually. This study provides an example of the combination of multiple pelagic components as a means to provide an integral assessment to advance ecosystem-based monitoring.
Keywords: Highly migratory predators; Multidisciplinary oceanographic surveys; Small pelagic fish; Physical oceanography; Generalised additive models; Bay of Biscay; TRANS-EQUATORIAL MIGRATION; FINE-SCALE; MARINE PREDATOR; FORAGE FISH; VERTICAL-DISTRIBUTION; SPATIAL-DISTRIBUTION; SCHOOLING BEHAVIOR; PREY INTERACTIONS; PUFFINUS-GRISEUS; INTERNAL TIDES
Issue Date: 2019
Type: Article
DOI: 10.3354/meps12838
ISSN: 0171-8630
E-ISSN: 1616-1599
Funder: `Viceconsejeria de Agricultura, Pesca y Politicas Alimentarias - Departamento de Desarrollo Economico y Competitividad' of the Basque Government
`Secretaria General de Pesca, Ministerio de Agricultura, Alimentacion y Medio Ambiente' of the Spanish Government
Juan de la Cierva of the Spanish Ministry of Economy, Industry and Competitiveness [JCI-2010-07639]
Ramon y Cajal of the Spanish Ministry of Economy, Industry and Competitiveness [RYC-2012-09897]
Spanish Ministry of Economy, Industry and Competitiveness [BES-2014-070597, PCIG09-GA-2011-293774, CTM2013-47032-R]
Appears in Publication types:Artículos científicos

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