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Title: The submarine volcano eruption off El Hierro Island: Effects on the scattering biota and the evolution of the pelagic community
Authors: Ariza, A.V.
Kaartvedt, S.
Røstad, A.
Garijo, J.C.
Arístegui Ruiz, Javier 
Fraile Nuez, Eugenio 
Hernández León, Santiago Manuel 
UNESCO Clasification: 250621 Vulcanología
251001 Oceanografía biológica
Issue Date: 2014
Conference: IV Congress of Marine Sciences
Abstract: The submarine volcano eruption off El Hierro Island (Canary Islands) occurring on 10th October 2011 promoted dramatic perturbations in the water column leading to changes in the pelagic fauna. In order 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 the evolution of the plankton and nekton communities through the eruptive and post-eruptive phases. Decrease of oxygen, acidification, rising temperature and dumping of chemicals in shallow waters resulted in a reduction of epipelagic stocks and a disruption of diel vertical migration (nocturnal ascent) of mesopelagic organisms. Futhermore, 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 pelagic biota restored to baseline levels, but no evidence of a volcano-induced bloom was apparent in the plankton community.
ISBN: 84-697-0471-0
Source: Book of Abstracts submitted to the IV Congress of Marine Sciences. Las Palmas de Gran Canaria, June 11th to 13th 2014, p. 225
Appears in Collections:Actas de congresos
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