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Abstract:

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.

Registro:

Documento: Artículo
Título:The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem
Autor:Alemany, D.; Acha, E.M.; Iribarne, O.
Filiación:Laboratorio de Ecología, Biología, FCEyN, Universidad Nacional de Mar Del Plata, CC 573, Correo Central, B7600WAG, Mar del Plata, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar Del Plata, Mar del Plata, Argentina
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
Idioma: Inglés
Palabras clave: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)
Año:2009
Volumen:36
Número:11
Página de inicio:2111
Página de fin:2124
DOI: http://dx.doi.org/10.1111/j.1365-2699.2009.02148.x
Título revista:Journal of Biogeography
Título revista abreviado:J. Biogeogr.
ISSN:03050270
CODEN:JBIOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03050270_v36_n11_p2111_Alemany

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Citas:

---------- APA ----------
Alemany, D., Acha, E.M. & Iribarne, O. (2009) . The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem. Journal of Biogeography, 36(11), 2111-2124.
http://dx.doi.org/10.1111/j.1365-2699.2009.02148.x
---------- CHICAGO ----------
Alemany, D., Acha, E.M., Iribarne, O. "The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem" . Journal of Biogeography 36, no. 11 (2009) : 2111-2124.
http://dx.doi.org/10.1111/j.1365-2699.2009.02148.x
---------- MLA ----------
Alemany, D., Acha, E.M., Iribarne, O. "The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem" . Journal of Biogeography, vol. 36, no. 11, 2009, pp. 2111-2124.
http://dx.doi.org/10.1111/j.1365-2699.2009.02148.x
---------- VANCOUVER ----------
Alemany, D., Acha, E.M., Iribarne, O. The relationship between marine fronts and fish diversity in the patagonian shelf large marine ecosystem. J. Biogeogr. 2009;36(11):2111-2124.
http://dx.doi.org/10.1111/j.1365-2699.2009.02148.x