Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic

Programa de doctorado: Oceanografía Diel Vertical Migration (DVM) is the most important synchronized animal movement in the ocean, and probably represents the largest migration on the planet in terms of biomass. The most extensive vertical displacements (hundreds of meters) are mainly undertaken by...

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Main Author: Vicente Ariza,Alejandro
Other Authors: Hernández León, Santiago Manuel, Instituto Universitario de Oceanografía y Cambio Global (IOCAG), IU de Oceanografía y Cambio Global, Departamento de Biología, Oceanografía
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10553/19821
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spelling ftunivlaspalmas:oai:accedacris.ulpgc.es:10553/19821 2023-05-15T17:41:23+02:00 Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic Vicente Ariza,Alejandro Hernández León, Santiago Manuel Instituto Universitario de Oceanografía y Cambio Global (IOCAG) IU de Oceanografía y Cambio Global Departamento de Biología Oceanografía 2017-01-12T03:30:54Z application/pdf http://hdl.handle.net/10553/19821 eng eng Ciclos Lunares y Fertilización Con Hierro. "Migradores y Flujo Activo en El Océano Atlántico" Estudios de la Bomba Vertical Oceánica en Remolinos de Mesoscala http://hdl.handle.net/10553/19821 730054 1087175 Sí by-nc-nd info:eu-repo/semantics/openAccess CC-BY-NC-ND 250101 Aeronomía 251005 Zoología marina 240106 Ecología animal Zooplancton marino Migración vertical Respiración en el océano Canarias info:eu-repo/semantics/doctoralThesis Thesis 2017 ftunivlaspalmas 2021-03-17T00:10:08Z Programa de doctorado: Oceanografía Diel Vertical Migration (DVM) is the most important synchronized animal movement in the ocean, and probably represents the largest migration on the planet in terms of biomass. The most extensive vertical displacements (hundreds of meters) are mainly undertaken by large zooplankton, as well as by small sh, shrimp and squid commonly known as micronekton. By feeding at the surface and then moving back to the deep, migrants play a key role in transferring energy and organic matter from productive shallow waters to the deep ocean. In this way, the atmospheric carbon incorporated into shallowliving organisms is exported to deeper waters and thus a ecting the global carbon cycle. Despite their importance, the micronekton have been systematically neglected by those developing biogeochemical budgets for the ocean. In this thesis we study micronekton vertical migration and its contribution to carbon export at the Canary Islands (subtropical northeast Atlantic). Since vertical migration can be monitored acoustically using echosounders, we rst described the main organisms causing sound scattering in the region. We have identi ed diverse animal layers and migrations extending down to at least 800 m depth according to acoustic records and net sampling. Migrant biomass estimates and respiration rates also demonstrate that micronekton are as e cient as zooplankton in storing carbon in intermediate waters (200-1000 m depth), with sh being the most important group. We also found that vertical distribution and migrant behavior changes drastically during light attenuation and pollution episodes associated with a submarine volcano eruption. The horizontal distribution of the micronekton was likewise a ected by oceanic eddies, which introduced a high degree of patchiness in animals inhabiting down to 900 m depth. We further discuss the potential contribution of micronekton to sequestering of carbon beyond 1000 m depth, based on their extensive migrations and physiological features. Our results show both the importance and sensitivity of vertical migratory micronekton in a changing ocean, highlighting the need to incorporate this community into future ecosystem models. Contiene resumenen español Doctoral or Postdoctoral Thesis Northeast Atlantic Universidad de Las Palmas de Gran Canaria: Acceda
institution Open Polar
collection Universidad de Las Palmas de Gran Canaria: Acceda
op_collection_id ftunivlaspalmas
language English
topic 250101 Aeronomía
251005 Zoología marina
240106 Ecología animal
Zooplancton marino
Migración vertical
Respiración en el océano
Canarias
spellingShingle 250101 Aeronomía
251005 Zoología marina
240106 Ecología animal
Zooplancton marino
Migración vertical
Respiración en el océano
Canarias
Vicente Ariza,Alejandro
Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
topic_facet 250101 Aeronomía
251005 Zoología marina
240106 Ecología animal
Zooplancton marino
Migración vertical
Respiración en el océano
Canarias
description Programa de doctorado: Oceanografía Diel Vertical Migration (DVM) is the most important synchronized animal movement in the ocean, and probably represents the largest migration on the planet in terms of biomass. The most extensive vertical displacements (hundreds of meters) are mainly undertaken by large zooplankton, as well as by small sh, shrimp and squid commonly known as micronekton. By feeding at the surface and then moving back to the deep, migrants play a key role in transferring energy and organic matter from productive shallow waters to the deep ocean. In this way, the atmospheric carbon incorporated into shallowliving organisms is exported to deeper waters and thus a ecting the global carbon cycle. Despite their importance, the micronekton have been systematically neglected by those developing biogeochemical budgets for the ocean. In this thesis we study micronekton vertical migration and its contribution to carbon export at the Canary Islands (subtropical northeast Atlantic). Since vertical migration can be monitored acoustically using echosounders, we rst described the main organisms causing sound scattering in the region. We have identi ed diverse animal layers and migrations extending down to at least 800 m depth according to acoustic records and net sampling. Migrant biomass estimates and respiration rates also demonstrate that micronekton are as e cient as zooplankton in storing carbon in intermediate waters (200-1000 m depth), with sh being the most important group. We also found that vertical distribution and migrant behavior changes drastically during light attenuation and pollution episodes associated with a submarine volcano eruption. The horizontal distribution of the micronekton was likewise a ected by oceanic eddies, which introduced a high degree of patchiness in animals inhabiting down to 900 m depth. We further discuss the potential contribution of micronekton to sequestering of carbon beyond 1000 m depth, based on their extensive migrations and physiological features. Our results show both the importance and sensitivity of vertical migratory micronekton in a changing ocean, highlighting the need to incorporate this community into future ecosystem models. Contiene resumenen español
author2 Hernández León, Santiago Manuel
Instituto Universitario de Oceanografía y Cambio Global (IOCAG)
IU de Oceanografía y Cambio Global
Departamento de Biología
Oceanografía
format Doctoral or Postdoctoral Thesis
author Vicente Ariza,Alejandro
author_facet Vicente Ariza,Alejandro
author_sort Vicente Ariza,Alejandro
title Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
title_short Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
title_full Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
title_fullStr Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
title_full_unstemmed Micronekton diel vertical migration and active flux in the subtropical Northeast Atlantic
title_sort micronekton diel vertical migration and active flux in the subtropical northeast atlantic
publishDate 2017
url http://hdl.handle.net/10553/19821
genre Northeast Atlantic
genre_facet Northeast Atlantic
op_relation Ciclos Lunares y Fertilización Con Hierro.
"Migradores y Flujo Activo en El Océano Atlántico"
Estudios de la Bomba Vertical Oceánica en Remolinos de Mesoscala
http://hdl.handle.net/10553/19821
730054
1087175

op_rights by-nc-nd
info:eu-repo/semantics/openAccess
op_rightsnorm CC-BY-NC-ND
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