Fine-scale structures as spots of increased fish concentration in the open ocean

Abstract Oceanic frontal zones have been shown to deeply influence the distribution of primary producers and, at the other extreme of the trophic web, top predators. However, the relationship between these structures and intermediate trophic levels is much more obscure. In this paper we address this...

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Autores principales:	Alberto Baudena, Enrico Ser-Giacomi, Donatella D’Onofrio, Xavier Capet, Cedric Cotté, Yves Cherel, Francesco D’Ovidio
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/753c2bdf00c54e3fb7ad467754e52cc8
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spelling	oai:doaj.org-article:753c2bdf00c54e3fb7ad467754e52cc82021-12-02T16:35:32ZFine-scale structures as spots of increased fish concentration in the open ocean10.1038/s41598-021-94368-12045-2322https://doaj.org/article/753c2bdf00c54e3fb7ad467754e52cc82021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94368-1https://doaj.org/toc/2045-2322Abstract Oceanic frontal zones have been shown to deeply influence the distribution of primary producers and, at the other extreme of the trophic web, top predators. However, the relationship between these structures and intermediate trophic levels is much more obscure. In this paper we address this knowledge gap by comparing acoustic measurements of mesopelagic fish concentrations to satellite-derived fine-scale Lagrangian Coherent Structures in the Indian sector of the Southern Ocean. First, we demonstrate that higher fish concentrations occur more frequently in correspondence with strong Lagrangian Coherent Structures. Secondly, we illustrate that, while increased fish densities are more likely to be observed over these structures, the presence of a fine-scale feature does not imply a concomitant fish accumulation, as other factors affect fish distribution. Thirdly, we show that, when only chlorophyll-rich waters are considered, front intensity modulates significantly more the local fish concentration. Finally, we discuss a model representing fish movement along Lagrangian features, specifically built for mid-trophic levels. Its results, obtained with realistic parameters, are qualitatively consistent with the observations and the spatio-temporal scales analysed. Overall, these findings may help to integrate intermediate trophic levels in trophic models, which can ultimately support management and conservation policies.Alberto BaudenaEnrico Ser-GiacomiDonatella D’OnofrioXavier CapetCedric CottéYves CherelFrancesco D’OvidioNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alberto Baudena Enrico Ser-Giacomi Donatella D’Onofrio Xavier Capet Cedric Cotté Yves Cherel Francesco D’Ovidio Fine-scale structures as spots of increased fish concentration in the open ocean
description	Abstract Oceanic frontal zones have been shown to deeply influence the distribution of primary producers and, at the other extreme of the trophic web, top predators. However, the relationship between these structures and intermediate trophic levels is much more obscure. In this paper we address this knowledge gap by comparing acoustic measurements of mesopelagic fish concentrations to satellite-derived fine-scale Lagrangian Coherent Structures in the Indian sector of the Southern Ocean. First, we demonstrate that higher fish concentrations occur more frequently in correspondence with strong Lagrangian Coherent Structures. Secondly, we illustrate that, while increased fish densities are more likely to be observed over these structures, the presence of a fine-scale feature does not imply a concomitant fish accumulation, as other factors affect fish distribution. Thirdly, we show that, when only chlorophyll-rich waters are considered, front intensity modulates significantly more the local fish concentration. Finally, we discuss a model representing fish movement along Lagrangian features, specifically built for mid-trophic levels. Its results, obtained with realistic parameters, are qualitatively consistent with the observations and the spatio-temporal scales analysed. Overall, these findings may help to integrate intermediate trophic levels in trophic models, which can ultimately support management and conservation policies.
format	article
author	Alberto Baudena Enrico Ser-Giacomi Donatella D’Onofrio Xavier Capet Cedric Cotté Yves Cherel Francesco D’Ovidio
author_facet	Alberto Baudena Enrico Ser-Giacomi Donatella D’Onofrio Xavier Capet Cedric Cotté Yves Cherel Francesco D’Ovidio
author_sort	Alberto Baudena
title	Fine-scale structures as spots of increased fish concentration in the open ocean
title_short	Fine-scale structures as spots of increased fish concentration in the open ocean
title_full	Fine-scale structures as spots of increased fish concentration in the open ocean
title_fullStr	Fine-scale structures as spots of increased fish concentration in the open ocean
title_full_unstemmed	Fine-scale structures as spots of increased fish concentration in the open ocean
title_sort	fine-scale structures as spots of increased fish concentration in the open ocean
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/753c2bdf00c54e3fb7ad467754e52cc8
work_keys_str_mv	AT albertobaudena finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT enricosergiacomi finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT donatelladonofrio finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT xaviercapet finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT cedriccotte finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT yvescherel finescalestructuresasspotsofincreasedfishconcentrationintheopenocean AT francescodovidio finescalestructuresasspotsofincreasedfishconcentrationintheopenocean
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Fine-scale structures as spots of increased fish concentration in the open ocean

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