Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)

Ruz-Moreno, Paula M.; Hidalgo, Pamela; Cornejo-D'Ottone, Marcela; Fierro-González, Pamela; Babbonney, Javier; Tang, Kam

doi:10.1016/j.seares.2023.102372

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Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)

Paula M. Ruz-Moreno, Pamela Hidalgo, Marcela Cornejo-D'Ottone, Pamela Fierro-González, Javier Babbonney, Kam Tang

Journal of Sea Research, Volume: 192, Start page: 102372

Swansea University Author: Kam Tang

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DOI (Published version): 10.1016/j.seares.2023.102372

Abstract

Expansion and shoaling of the Oxygen Minimum Zone (OMZ) in coastal upwelling systems due to climate change can have dire consequences on the ecosystem structure and productivity. The OMZ restricts the habitat range of most zooplankton, and species with low tolerance to hypoxia may suffer physiologic...

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Published in:	Journal of Sea Research
ISSN:	1385-1101
Published:	Elsevier BV 2023
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URI:	https://cronfa.swan.ac.uk/Record/cronfa62982
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first_indexed	2023-03-20T09:51:48Z
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spelling	v2 62982 2023-03-20 Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S) 69af43a3b9da24aef65c5d3a44956fe3 0000-0001-9427-9564 Kam Tang Kam Tang true false 2023-03-20 SBI Expansion and shoaling of the Oxygen Minimum Zone (OMZ) in coastal upwelling systems due to climate change can have dire consequences on the ecosystem structure and productivity. The OMZ restricts the habitat range of most zooplankton, and species with low tolerance to hypoxia may suffer physiological stress and mortality as a result. During 2013 and 2014, the copepod Acartia tonsa collected off northern Chile was used to evaluate how hypoxia may affect its survival and vital rates. Exposure of gravid females to severe hypoxia (~0.2 mL L−1 dissolved oxygen) resulted in total mortality. Hypoxia at ~0.5 mL L−1 decreased female survival to ~20% and egg production to nil. Hypoxia at ~0.8 mL L−1 decreased survival to ~50% but no change in egg production rate compared to the normoxia treatment. Egg hatching success was ~68% and naupliar development time was ~36% lower in hypoxia than normoxia. The critical and lethal oxygen levels for the species were estimated to be 1.78 and 0.73 mL L−1, respectively. Based on modeled historical data, the 1.5 mL L−1 isopleth has been moving upward at a rate of 1.3–2.0 m per year in northern Chile, barring interruptions during El Niño events. The long-term, gradual shoaling of the OMZ is expected to have significant impacts on the zooplankton community and productivity in the region. Journal Article Journal of Sea Research 192 102372 Elsevier BV 1385-1101 23 3 2023 2023-03-23 10.1016/j.seares.2023.102372 http://dx.doi.org/10.1016/j.seares.2023.102372 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University Another institution paid the OA fee This study was funded by the Chilean National Agency of Research and Development (ANID) by the Collaborative project CHILE–USA N° USA 2012– 0006, the CONICYT-PCHA/Doctorado Nacional/2011-21110560 Scholarship, and the project ANID-FONDECYT Postdoctoral (3180177) 2023-04-25T13:40:30.1100622 2023-03-20T09:43:58.8031694 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Paula M. Ruz-Moreno 1 Pamela Hidalgo 2 Marcela Cornejo-D'Ottone 3 Pamela Fierro-González 4 Javier Babbonney 5 Kam Tang 0000-0001-9427-9564 6 62982__26921__6c51ad44abe8468fbd0aa524025011ce.pdf JSeaRes_193.pdf 2023-03-23T15:09:55.3441092 Output 4620826 application/pdf Version of Record true © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
spellingShingle	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S) Kam Tang
title_short	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
title_full	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
title_fullStr	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
title_full_unstemmed	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
title_sort	Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)
author_id_str_mv	69af43a3b9da24aef65c5d3a44956fe3
author_id_fullname_str_mv	69af43a3b9da24aef65c5d3a44956fe3_***_Kam Tang
author	Kam Tang
author2	Paula M. Ruz-Moreno Pamela Hidalgo Marcela Cornejo-D'Ottone Pamela Fierro-González Javier Babbonney Kam Tang
format	Journal article
container_title	Journal of Sea Research
container_volume	192
container_start_page	102372
publishDate	2023
institution	Swansea University
issn	1385-1101
doi_str_mv	10.1016/j.seares.2023.102372
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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department_str	School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
url	http://dx.doi.org/10.1016/j.seares.2023.102372
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description	Expansion and shoaling of the Oxygen Minimum Zone (OMZ) in coastal upwelling systems due to climate change can have dire consequences on the ecosystem structure and productivity. The OMZ restricts the habitat range of most zooplankton, and species with low tolerance to hypoxia may suffer physiological stress and mortality as a result. During 2013 and 2014, the copepod Acartia tonsa collected off northern Chile was used to evaluate how hypoxia may affect its survival and vital rates. Exposure of gravid females to severe hypoxia (~0.2 mL L−1 dissolved oxygen) resulted in total mortality. Hypoxia at ~0.5 mL L−1 decreased female survival to ~20% and egg production to nil. Hypoxia at ~0.8 mL L−1 decreased survival to ~50% but no change in egg production rate compared to the normoxia treatment. Egg hatching success was ~68% and naupliar development time was ~36% lower in hypoxia than normoxia. The critical and lethal oxygen levels for the species were estimated to be 1.78 and 0.73 mL L−1, respectively. Based on modeled historical data, the 1.5 mL L−1 isopleth has been moving upward at a rate of 1.3–2.0 m per year in northern Chile, barring interruptions during El Niño events. The long-term, gradual shoaling of the OMZ is expected to have significant impacts on the zooplankton community and productivity in the region.
published_date	2023-03-23T13:40:29Z
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Potential effects of shoaling of oxygen minimum zone on the population of Acartia (Acanthacartia) tonsa in the Humboldt Current Upwelling System (23°S)

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