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Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic

The impact of the Amazon River freshwater plume on planktonic cnidarians over neritic and oceanic provinces is unknown. To provide further knowledge we took advantage of an oceanographic cruise performed in October 2012 in the Western Atlantic off the North Brazilian coast (8°N, 51°W—3.5°S, 37°W). A...

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Autores principales: Tosetto, Everton Giachini, Neumann-Leitão, Sigrid, Araujo, Moacyr, Minto Dimoune, Djoirka, Bertrand, Arnaud, Nogueira Júnior, Miodeli
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456164/
https://www.ncbi.nlm.nih.gov/pubmed/37624787
http://dx.doi.org/10.1371/journal.pone.0290667
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author Tosetto, Everton Giachini
Neumann-Leitão, Sigrid
Araujo, Moacyr
Minto Dimoune, Djoirka
Bertrand, Arnaud
Nogueira Júnior, Miodeli
author_facet Tosetto, Everton Giachini
Neumann-Leitão, Sigrid
Araujo, Moacyr
Minto Dimoune, Djoirka
Bertrand, Arnaud
Nogueira Júnior, Miodeli
author_sort Tosetto, Everton Giachini
collection PubMed
description The impact of the Amazon River freshwater plume on planktonic cnidarians over neritic and oceanic provinces is unknown. To provide further knowledge we took advantage of an oceanographic cruise performed in October 2012 in the Western Atlantic off the North Brazilian coast (8°N, 51°W—3.5°S, 37°W). A complex and dynamic system was observed, with strong currents and eddies dispersing the plume over a large area. Our results show that the Amazon River shapes marine habitats with a thin highly productive surface layer compressed by a deeper oxygen minimum zone both over the shelf and in the open ocean. We hypothesized that such habitat structure is particularly advantageous to planktonic cnidarians, which have low metabolic rates, being able to survive in hypoxic zones, resulting in high species richness and abundance. Over the shelf, distinctions were sharp and the area under the influence of the plume presented a diverse assemblage occurring in large abundance, while outside the plume, the hydromedusa Liriope tetraphylla was dominant and occurred almost alone. Divergences in the oceanic province were less pronounced, but still expressive being mostly related to the abundance of dominant species. We concluded that Amazon River plume is a paramount physical feature that profoundly affects the dynamics of the mesoscale habitat structure in the Western Equatorial Atlantic Ocean and that such habitat structure is responsible for shaping planktonic cnidarian assemblages both in neritic and oceanic provinces.
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spelling pubmed-104561642023-08-26 Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic Tosetto, Everton Giachini Neumann-Leitão, Sigrid Araujo, Moacyr Minto Dimoune, Djoirka Bertrand, Arnaud Nogueira Júnior, Miodeli PLoS One Research Article The impact of the Amazon River freshwater plume on planktonic cnidarians over neritic and oceanic provinces is unknown. To provide further knowledge we took advantage of an oceanographic cruise performed in October 2012 in the Western Atlantic off the North Brazilian coast (8°N, 51°W—3.5°S, 37°W). A complex and dynamic system was observed, with strong currents and eddies dispersing the plume over a large area. Our results show that the Amazon River shapes marine habitats with a thin highly productive surface layer compressed by a deeper oxygen minimum zone both over the shelf and in the open ocean. We hypothesized that such habitat structure is particularly advantageous to planktonic cnidarians, which have low metabolic rates, being able to survive in hypoxic zones, resulting in high species richness and abundance. Over the shelf, distinctions were sharp and the area under the influence of the plume presented a diverse assemblage occurring in large abundance, while outside the plume, the hydromedusa Liriope tetraphylla was dominant and occurred almost alone. Divergences in the oceanic province were less pronounced, but still expressive being mostly related to the abundance of dominant species. We concluded that Amazon River plume is a paramount physical feature that profoundly affects the dynamics of the mesoscale habitat structure in the Western Equatorial Atlantic Ocean and that such habitat structure is responsible for shaping planktonic cnidarian assemblages both in neritic and oceanic provinces. Public Library of Science 2023-08-25 /pmc/articles/PMC10456164/ /pubmed/37624787 http://dx.doi.org/10.1371/journal.pone.0290667 Text en © 2023 Tosetto et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Tosetto, Everton Giachini
Neumann-Leitão, Sigrid
Araujo, Moacyr
Minto Dimoune, Djoirka
Bertrand, Arnaud
Nogueira Júnior, Miodeli
Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title_full Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title_fullStr Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title_full_unstemmed Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title_short Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic
title_sort amazon river plume habitats shape planktonic cnidarian assemblages in the western atlantic
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456164/
https://www.ncbi.nlm.nih.gov/pubmed/37624787
http://dx.doi.org/10.1371/journal.pone.0290667
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