Alejandro Ariza

Université de Montpellier

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Santiago Hernández‐León

Universidad de Las Palmas de Gran Canaria

Anne Lebourges‐Dhaussy

Institut de Recherche pour le Développement

E. Fraile‐Nuez

Instituto Español de Oceanografía

Arnaud Bertrand

Centre National de la Recherche Scientifique

Juan Carlos Garijo

Universidad de Las Palmas de Gran Canaria

Javier Arı́stegui

Universidad de Las Palmas de Gran Canaria

Alejandro Escánez

Universidade de Vigo

Gildas Roudaut

Institut de Recherche pour le Développement

Anders Røstad

King Abdullah University of Science and Technology

Melchor González‐Dávila

Universidad de Las Palmas de Gran Canaria

Cooperative Institutions

Universidad de Las Palmas de Gran Canaria

Centre National de la Recherche Scientifique

Institut de Recherche pour le Développement

Ifremer

Instituto Español de Oceanografía

Consejo Superior de Investigaciones Científicas

Université de Bretagne Occidentale

Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques

Sorbonne Université

Marine Biodiversity Exploitation and Conservation

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Daily ration and feeding chronology of dominant diel vertical migrant fishes in the Subtropical Eastern North Atlantic Ocean

Alejandro Ariza Natacha Aguilar Santiago Hernández‐León

Diel vertical migration

Chronology

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Diel vertical migrants and the ocean carbon pump: is there a ladder of migration?

Santiago Hernández León E. Fraile‐Nuez Juan Carlos Garijo Alejandro Ariza Xabier Irigoien

Diel vertical migration

Biological pump

Carbon fibers

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Erratum: The submarine volcano eruption at the island of El Hierro: physical-chemical perturbation and biological response

Scientific Reports (2012)

E. Fraile‐Nuez Melchor González‐Dávila J. Magdalena Santana‐Casiano Javier Arı́stegui Iván J. Alonso‐González

On October 10 2011 an underwater eruption gave rise to a novel shallow submarine volcano south of the island of El Hierro, Canary Islands, Spain. During the eruption large quantities of mantle-derived gases, solutes and heat were released into the surrounding waters. In order to monitor the impact of the eruption on the marine ecosystem, periodic multidisciplinary cruises were carried out. Here, we present an initial report of the extreme physical-chemical perturbations caused by this event, comprising thermal changes, water acidification, deoxygenation and metal-enrichment, which resulted in significant alterations to the activity and composition of local plankton communities. Our findings highlight the potential role of this eruptive process as a natural ecosystem-scale experiment for the study of extreme effects of global change stressors on marine environments.

Marine ecosystem

Submarine volcano

10.1038/srep01020

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The submarine volcano eruption off El Hierro island:effects on the scattering migrants and the evolution of the pelagic communities

Journal of Geophysical Research Atmospheres (2014)

S. Daartvedt Javier Arı́stegui Juan Carlos Garijo Anders Røstad Santiago Hernández‐León

Submarine volcano

Vulcanian eruption

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Macrozooplankton and micronekton diversity and associated carbon vertical patterns and fluxes under distinct productive conditions around the Kerguelen Islands

Journal of Marine Systems (2021)

Cédric Cotté Alejandro Ariza A. Berne Jérémie Habasque Anne Lebourges‐Dhaussy

Mesopelagic zone

Biogeochemical Cycle

Diel vertical migration

10.1016/j.jmarsys.2021.103650

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A rare oasis effect for forage fauna in oceanic eddies at the global scale

Nature Communications (2024)

Aurore Receveur Christophe Menkès Matthieu Lengaigne Alejandro Ariza Arnaud Bertrand

Abstract Oceanic eddies are recognized as pivotal components in marine ecosystems, believed to concentrate a wide range of marine life spanning from phytoplankton to top predators. Previous studies have posited that marine predators are drawn to these eddies due to an aggregation of their forage fauna. In this study, we examine the response of forage fauna, detected by shipboard acoustics, across a broad sample of a thousand eddies across the world’s oceans. While our findings show an impact of eddies on surface temperatures and phytoplankton in most cases, they reveal that only a minority (13%) exhibit significant effects on forage fauna, with only 6% demonstrating an oasis effect. We also show that an oasis effect can occur both in anticyclonic and cyclonic eddies, and that the few high-impact eddies are marked by high eddy amplitude and strong water-mass-trapping. Our study underscores the nuanced and complex nature of the aggregating role of oceanic eddies, highlighting the need for further research to elucidate how these structures attract marine predators.

Eddy

Anticyclone

Forage fish

10.1038/s41467-024-49113-3

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Zooplankton biomass and indices of grazing, metabolism and growth after a dust deposition event in subtropical waters.

I. Herrera-Rivero Lidia Yebra Santiago Hernández‐León Alejandro Ariza Gara Franchy

Deposition

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The submarine volcano eruption off El Hierro island: effects on the scattering biota and the evolution of the pelagic community

Alejandro Ariza

Trabajo realizado por Ariza, A. V., Kaartvedt, S. Rostad, A. Garijo, J. C., Aristegui, J. Fraile-Nuez, E., Hernandez-Leon, S.

Submarine volcano

Biota

Vulcanian eruption

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The Submarine Volcano Eruption off El Hierro Island: Effects on the Scattering Migrant Biota and the Evolution of the Pelagic Communities

PLoS ONE (2014)

Alejandro Ariza Stein Kaartvedt Anders Røstad Juan Carlos Garijo Javier Arı́stegui

The submarine volcano eruption off El Hierro Island (Canary Islands) on 10 October 2011 promoted dramatic perturbation of the water column leading to changes in the distribution of pelagic fauna. To study the response of the scattering biota, we combined acoustic data with hydrographic profiles and concurrent sea surface turbidity indexes from satellite imagery. We also monitored changes in the plankton and nekton communities through the eruptive and post-eruptive phases. Decrease of oxygen, acidification, rising temperature and deposition of chemicals in shallow waters resulted in a reduction of epipelagic stocks and a disruption of diel vertical migration (nocturnal ascent) of mesopelagic organisms. Furthermore, decreased light levels at depth caused by extinction in the volcanic plume resulted in a significant shallowing of the deep acoustic scattering layer. Once the eruption ceased, the distribution and abundances of the pelagic biota returned to baseline levels. There was no evidence of a volcano-induced bloom in the plankton community.

Submarine volcano

Nekton

Mesopelagic zone

Diel vertical migration

Biota

10.1371/journal.pone.0102354

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Citations (27)

Acoustic seascape partitioning through functional data analysis

Journal of Biogeography (2022)

Alejandro Ariza Anne Lebourges‐Dhaussy David Nérini Etienne Pauthenet Gildas Roudaut

Abstract Aim Water column acoustic backscatter is regularly registered during oceanographic surveys, providing valuable information on the composition and distribution of pelagic life in the ocean. We propose an objective approach based on functional data analysis to classify these acoustic seascapes into biogeographical regions. Location Tropical South Atlantic Ocean off northeastern Brazil. Taxon Sound‐scattering pelagic fauna detected with acoustic echosounders, principally small fish, crustaceans, squid and diverse gelatinous life‐forms. Methods We use acoustic backscatter as a function of depth, simultaneously at three frequencies, to numerically describe the vertical distribution and composition of sound‐scattering organisms in the water column. This information is used to classify the acoustic seascape through functional principal component analysis. The analysis routine is tested and illustrated with data collected at 38, 70 and 120 kHz in waters affected by contrasting environmental conditions. Results Acoustic seascape partitioning mirrored the distribution of current systems, fronts and taxonomically based regionalization. The study area was divided between slope‐boundary and open‐ocean waters, and between spring and fall hydrological regimes. Main Conclusions The acoustic seascape consistency and the spatiotemporal coherence of the regions classified show that the method is efficient at identifying homogeneous and cohesive sound‐scattering communities. Comparisons against hydrological and biological regionalization prove that the method is reliable at delineating distinct pelagic ecosystems in a cost‐efficient and non‐intrusive way.

Seascape

Backscatter (email)

Echo sounding

10.1111/jbi.14534

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Citations (9)