The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity
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 in...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13851101_v66_n1_p39_Mauna http://hdl.handle.net/20.500.12110/paper_13851101_v66_n1_p39_Mauna |
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paper:paper_13851101_v66_n1_p39_Mauna2023-06-08T16:12:38Z The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity 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 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13851101_v66_n1_p39_Mauna http://hdl.handle.net/20.500.12110/paper_13851101_v66_n1_p39_Mauna |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| topic_facet |
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 |
| description |
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. |
| title |
The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| title_short |
The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| title_full |
The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| title_fullStr |
The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| title_full_unstemmed |
The influence of a large SW Atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| title_sort |
influence of a large sw atlantic shelf-break frontal system on epibenthic community composition, trophic guilds, and diversity |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13851101_v66_n1_p39_Mauna http://hdl.handle.net/20.500.12110/paper_13851101_v66_n1_p39_Mauna |
| _version_ |
1768543913310683136 |