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Temporal changes in mesoscale aggregations and spatial distribution scenarios of the Peruvian anchovy (Engraulis ringens)

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dc.contributor.author Moron, G.
dc.contributor.author Galloso, P.
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Torrejon-Magallanes, J.
dc.date.accessioned 2019-12-06T21:04:48Z
dc.date.available 2019-12-06T21:04:48Z
dc.date.issued 2019
dc.identifier.uri https://hdl.handle.net/20.500.12866/7635
dc.description.abstract The Peruvian anchovy (Engraulis ringens) is the most important small pelagic of the Humboldt Current System (HCS), supporting the largest mono-specific fishery in the world. The spatial behavior of this species tends to be very dynamic at different spatial scales, influenced mostly by its biomass level and environmental factors. The aim of this study was to analyze temporal and spatial fluctuations in anchovy spatial distribution off Peru, based and modeled on acoustic data, focusing on large- and meso-scale spatial structures. We employed data from 41 scientific surveys (1994–2016) and Bayesian hierarchical spatial models to obtain the anchovy's spatial distribution, allowing us to identify spatial structures at specific scales. Our results showed similar temporal trends in the number of mesoscale structures, their areas and anchovy density, exhibiting altogether two breakpoints in the time series: ~1999 and ~2013. The last period (2013–2016) was similar to the earlier one (1994–1999), in terms of low values of mesoscale structure indicators. On the other hand, we identified four spatial scenarios differentiated by the aggregative behavior, which were highly influenced by seasons and El Niño events. Each scenario had recurrent, or fidelity, areas placed in different locations. For instance, for the ‘El Niño scenario’ a particularly coastal recurrent area was identified, which might be a refuge zone for this species during these unfavorable events. Finally, we assessed differences in biomass estimates of each scenario. The highest biomass values were estimated for the ‘Summer favorable scenario’ and the lowest ones for the ‘El Niño scenario’ which supports the MacCall's basin hypothesis for this species. This study expands the current knowledge of the Peruvian anchovy and it is a first step to understand the effects on this species of the last El Niño events (2014–2016) that occurred in the northern Humboldt Current System. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Deep Sea Research. Part II, Topical Studies in Oceanography
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject El Niño en_US
dc.subject Pacific Ocean en_US
dc.subject Engraulidae en_US
dc.subject Humboldt Current en_US
dc.subject acoustic data en_US
dc.subject Bayesian analysis en_US
dc.subject Biomass en_US
dc.subject clupeoid en_US
dc.subject Engraulis ringens en_US
dc.subject Environmental factors en_US
dc.subject hierarchical system en_US
dc.subject Humboldt current system en_US
dc.subject Mesoscale structure en_US
dc.subject Organism aggregations en_US
dc.subject Peruvian anchovy en_US
dc.subject Recurrent areas en_US
dc.subject spatial distribution en_US
dc.subject Spatial distribution en_US
dc.subject Spatial variations en_US
dc.subject temporal analysis en_US
dc.subject Temporal and spatial en_US
dc.subject Temporal variation en_US
dc.subject Temporal variations en_US
dc.title Temporal changes in mesoscale aggregations and spatial distribution scenarios of the Peruvian anchovy (Engraulis ringens) en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.dsr2.2018.11.009
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.11
dc.relation.issn 1879-0100

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