The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem

Aim To evaluate the relationship between marine fronts and (1) fish diversity patterns, (2) fish biomass distribution, and (3) fish assemblage structure. Location Patagonian Shelf, Southwestern Atlantic Ocean. Methods Three main frontal systems and eight nearby zones (frontal vs. non-frontal areas)...

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Detalles Bibliográficos
Autores principales: Alemany, D., Acha, E.M., Iribarne, O.
Formato: JOUR
Lenguaje:English
Materias:
Assemblages
Biodiversity
Biomass
Fish
Marine fronts
Patagonian Shelf
Southwestern Atlantic Ocean
biodiversity
biomass
demersal fish
marine ecosystem
multivariate analysis
nutrient availability
parameterization
pelagic ecosystem
population structure
seasonal variation
Atlantic Ocean
Atlantic Ocean (Northwest)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03050270_v36_n11_p2111_Alemany
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03050270_v36_n11_p2111_Alemany2023-10-03T15:21:11Z The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem Alemany, D. Acha, E.M. Iribarne, O. Assemblages Biodiversity Biomass Fish Marine fronts Patagonian Shelf Southwestern Atlantic Ocean biodiversity biomass demersal fish marine ecosystem multivariate analysis nutrient availability parameterization pelagic ecosystem population structure seasonal variation Atlantic Ocean Atlantic Ocean (Northwest) Aim To evaluate the relationship between marine fronts and (1) fish diversity patterns, (2) fish biomass distribution, and (3) fish assemblage structure. Location Patagonian Shelf, Southwestern Atlantic Ocean. Methods Three main frontal systems and eight nearby zones (frontal vs. non-frontal areas) were compared. An extensive fishery database, obtained during an a priori sampling scheme (spatial resolution 1 × 1) from 1978 to 1979, was employed. Analyses of 248 trawling stations were performed using a combination of diversity measures (species richness, Shannon diversity and evenness), biomass analyses and multivariate analyses [nonparametric analysis of similarity (ANOSIM), non-metric multidimensional scaling ordination (NMDS) and similarity percentages (SIMPER)] to evaluate the effect of fronts on fish communities. Results In total, 46 fish taxa were identified. Demersal fish diversity increased at the tidal front of Península Valdés but decreased in the frontal zones of the Southern Shelf-Break and Magellan frontal systems. The richness and biomass of pelagic fish were higher at the Península Valdés Tidal Front, while the biomass of demersal fish was higher at its non-frontal counterpart. Fish diversity did not differ consistently along the Northern Shelf-Break Front. However, a higher fish biomass was registered at the non-frontal zone. Demersal and pelagic fish assemblages differed between frontal and non-frontal zones. Main conclusions The Patagonian Shelf Large Marine Ecosystem has diverse frontal types that appear to have different effects on fish diversity and assemblage structure. Seasonal (tidal) or permanent fronts have different effects on the parameters analysed, which could be due to productivity-diversity relationships. The Península Valdés Tidal Front, a relatively short temporal scale system, demonstrates a stronger influence on fish diversity, biomass and assemblage structure than the other frontal areas studied. The seasonality of nutrient input owing to frontogenesis, which begins during the austral spring, may play an important role in determining local diversity. At permanent frontal features, diversity decreases when the nutrient availability is high. This is potentially because, when food resources increase, a few species become dominant. © 2009 Blackwell Publishing Ltd. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03050270_v36_n11_p2111_Alemany
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic Assemblages
Biodiversity
Biomass
Fish
Marine fronts
Patagonian Shelf
Southwestern Atlantic Ocean
biodiversity
biomass
demersal fish
marine ecosystem
multivariate analysis
nutrient availability
parameterization
pelagic ecosystem
population structure
seasonal variation
Atlantic Ocean
Atlantic Ocean (Northwest)
spellingShingle Assemblages
Biodiversity
Biomass
Fish
Marine fronts
Patagonian Shelf
Southwestern Atlantic Ocean
biodiversity
biomass
demersal fish
marine ecosystem
multivariate analysis
nutrient availability
parameterization
pelagic ecosystem
population structure
seasonal variation
Atlantic Ocean
Atlantic Ocean (Northwest)
Alemany, D.
Acha, E.M.
Iribarne, O.
The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
topic_facet Assemblages
Biodiversity
Biomass
Fish
Marine fronts
Patagonian Shelf
Southwestern Atlantic Ocean
biodiversity
biomass
demersal fish
marine ecosystem
multivariate analysis
nutrient availability
parameterization
pelagic ecosystem
population structure
seasonal variation
Atlantic Ocean
Atlantic Ocean (Northwest)
description Aim To evaluate the relationship between marine fronts and (1) fish diversity patterns, (2) fish biomass distribution, and (3) fish assemblage structure. Location Patagonian Shelf, Southwestern Atlantic Ocean. Methods Three main frontal systems and eight nearby zones (frontal vs. non-frontal areas) were compared. An extensive fishery database, obtained during an a priori sampling scheme (spatial resolution 1 × 1) from 1978 to 1979, was employed. Analyses of 248 trawling stations were performed using a combination of diversity measures (species richness, Shannon diversity and evenness), biomass analyses and multivariate analyses [nonparametric analysis of similarity (ANOSIM), non-metric multidimensional scaling ordination (NMDS) and similarity percentages (SIMPER)] to evaluate the effect of fronts on fish communities. Results In total, 46 fish taxa were identified. Demersal fish diversity increased at the tidal front of Península Valdés but decreased in the frontal zones of the Southern Shelf-Break and Magellan frontal systems. The richness and biomass of pelagic fish were higher at the Península Valdés Tidal Front, while the biomass of demersal fish was higher at its non-frontal counterpart. Fish diversity did not differ consistently along the Northern Shelf-Break Front. However, a higher fish biomass was registered at the non-frontal zone. Demersal and pelagic fish assemblages differed between frontal and non-frontal zones. Main conclusions The Patagonian Shelf Large Marine Ecosystem has diverse frontal types that appear to have different effects on fish diversity and assemblage structure. Seasonal (tidal) or permanent fronts have different effects on the parameters analysed, which could be due to productivity-diversity relationships. The Península Valdés Tidal Front, a relatively short temporal scale system, demonstrates a stronger influence on fish diversity, biomass and assemblage structure than the other frontal areas studied. The seasonality of nutrient input owing to frontogenesis, which begins during the austral spring, may play an important role in determining local diversity. At permanent frontal features, diversity decreases when the nutrient availability is high. This is potentially because, when food resources increase, a few species become dominant. © 2009 Blackwell Publishing Ltd.
format JOUR
author Alemany, D.
Acha, E.M.
Iribarne, O.
author_facet Alemany, D.
Acha, E.M.
Iribarne, O.
author_sort Alemany, D.
title The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
title_short The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
title_full The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
title_fullStr The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
title_full_unstemmed The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
title_sort relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
url http://hdl.handle.net/20.500.12110/paper_03050270_v36_n11_p2111_Alemany
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