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Abstract:

Productivity gradients (i.e., through bottom-up control) have an important influence on variability in species diversity and community composition in marine systems. At the SW Atlantic shelf-break front (SBF), we hypothesized that a high and stable food supply in areas under the core of a frontal influence (F) promotes a different benthic community structure (i.e., species diversity, taxa biomasses, and composition of feeding guilds) than in areas located under marginal influences of the front (M). In 2007, we sampled 34 trawling stations located across the SBF to evaluate this hypothesis. We compared epibenthic community composition, diversity indices, and species and trophic guild biomass in F and M areas. We observed differences in community composition, predator biomass, and the biomass of some taxa. However, we did not detect any changes in diversity indices, suspension feeder biomass, or grazer-omnivore biomass. The scallop, Zygochlamys patagonica, sponges, and the brittle star, Ophiacantha vivipara, together with the sea star Diplasterias brandtii characterized frontal areas. Marginal areas were characterized by the scallop, Z. patagonica, the parchment worm, Chaetopterus variopedatus, the basket star, Gorgonocephalus chilensis, the sea urchin, Austrocidaris canaliculata, and the sea star, Ctenodiscus australis. These shifts in taxa were not always reflected in biomass differences between areas. These results demonstrate that spatial variations in oceanographic structure, even over spatial scales of tens of kilometers, can affect composition and shift species dominance in benthic communities. © 2011 Elsevier B.V.

Registro:

Documento: Artículo
Título:The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity
Autor:Mauna, A.C.; Acha, E.M.; Lasta, M.L.; Iribarne, O.O.
Filiación:Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo V. Ocampo 1, Mar del Plata B7602HSA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rivadavia 1906, Buenos Aires 1033, Argentina
Laboratorio de Ecología, Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3250, Mar del Plata B7602HSA, Argentina
Idioma: Inglés
Palabras clave:Community Composition; Diversity; Epibenthos; Marine Fronts; SW Atlantic; benthos; bivalve; echinoderm; food supply; grazing; marine ecosystem; shelf break; spatial variation; species diversity; sponge; trophic conditions; water mass; Atlantic Ocean; Atlantic Ocean (Southwest); Asteroidea; Chaetopterus variopedatus; Ctenodiscus; Echinoidea; Gorgonocephalus chilensis; Ophiacantha vivipara; Ophiuroidea; Zygochlamys patagonica
Año:2011
Volumen:66
Número:1
Página de inicio:39
Página de fin:46
DOI: http://dx.doi.org/10.1016/j.seares.2011.04.014
Título revista:Journal of Sea Research
Título revista abreviado:J. Sea Res.
ISSN:13851101
CODEN:JSREF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13851101_v66_n1_p39_Mauna

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Citas:

---------- APA ----------
Mauna, A.C., Acha, E.M., Lasta, M.L. & Iribarne, O.O. (2011) . The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity. Journal of Sea Research, 66(1), 39-46.
http://dx.doi.org/10.1016/j.seares.2011.04.014
---------- CHICAGO ----------
Mauna, A.C., Acha, E.M., Lasta, M.L., Iribarne, O.O. "The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity" . Journal of Sea Research 66, no. 1 (2011) : 39-46.
http://dx.doi.org/10.1016/j.seares.2011.04.014
---------- MLA ----------
Mauna, A.C., Acha, E.M., Lasta, M.L., Iribarne, O.O. "The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity" . Journal of Sea Research, vol. 66, no. 1, 2011, pp. 39-46.
http://dx.doi.org/10.1016/j.seares.2011.04.014
---------- VANCOUVER ----------
Mauna, A.C., Acha, E.M., Lasta, M.L., Iribarne, O.O. The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity. J. Sea Res. 2011;66(1):39-46.
http://dx.doi.org/10.1016/j.seares.2011.04.014