Diet components in the food of Antarctic ascidians living at low levels of primary production
Coupling between pelagic and benthic systems has been described in numerous shallow water communities. In Potter Cove, where pelagic primary production is low (not only during the Antarctic winter but also during the summer), the rich benthic community present there must depend on other food sources...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v16_n2_p123_Tatian http://hdl.handle.net/20.500.12110/paper_09541020_v16_n2_p123_Tatian |
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paper:paper_09541020_v16_n2_p123_Tatian2023-06-08T15:55:43Z Diet components in the food of Antarctic ascidians living at low levels of primary production Esnal, Graciela Beatriz Benthos Seston South Shetland Islands Southern Ocean Stomach contents benthic-pelagic coupling diet food supply primary production resuspension Antarctica King George Island Potter Cove South Shetland Islands Ascidia Ascidiacea Bacillariophyta Cnemidocarpa Cnemidocarpa verrucosa Dinophyceae Haptophyceae Invertebrata Mastigophora (flagellates) Coupling between pelagic and benthic systems has been described in numerous shallow water communities. In Potter Cove, where pelagic primary production is low (not only during the Antarctic winter but also during the summer), the rich benthic community present there must depend on other food sources than phytoplankton. Over a year-round period we determined the abundance of the different seston particles which constituted the stomach contents of the Antarctic ascidian Cnemidocarpa verrucosa (Lesson, 1830) at Potter Cove. Stomach repletion was highest in November and lowest in June. Ascidians took in a wide range of particles from large detritus (macroalgal debris and faecal pellets) to minute particles < 5 μm. Large detritus and minute particles together represent the main percentage of contents throughout the year (mean 91%). Diatoms were a low percentage (mean 4.5%). Unidentified flagellates, dinoflagellates and coccolithophorids were scarce, with mean values lower than 4%. Among diatoms benthic species were more abundant in summer and pelagic ones prevailed from March to November. Resuspension of benthic material due to wind mixing and the input of allochthonous particles by currents are important mechanisms that ensure food for ascidians and the community of suspension feeders in Potter Cove. Fil:Esnal, G.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v16_n2_p123_Tatian http://hdl.handle.net/20.500.12110/paper_09541020_v16_n2_p123_Tatian |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Benthos Seston South Shetland Islands Southern Ocean Stomach contents benthic-pelagic coupling diet food supply primary production resuspension Antarctica King George Island Potter Cove South Shetland Islands Ascidia Ascidiacea Bacillariophyta Cnemidocarpa Cnemidocarpa verrucosa Dinophyceae Haptophyceae Invertebrata Mastigophora (flagellates) |
| spellingShingle |
Benthos Seston South Shetland Islands Southern Ocean Stomach contents benthic-pelagic coupling diet food supply primary production resuspension Antarctica King George Island Potter Cove South Shetland Islands Ascidia Ascidiacea Bacillariophyta Cnemidocarpa Cnemidocarpa verrucosa Dinophyceae Haptophyceae Invertebrata Mastigophora (flagellates) Esnal, Graciela Beatriz Diet components in the food of Antarctic ascidians living at low levels of primary production |
| topic_facet |
Benthos Seston South Shetland Islands Southern Ocean Stomach contents benthic-pelagic coupling diet food supply primary production resuspension Antarctica King George Island Potter Cove South Shetland Islands Ascidia Ascidiacea Bacillariophyta Cnemidocarpa Cnemidocarpa verrucosa Dinophyceae Haptophyceae Invertebrata Mastigophora (flagellates) |
| description |
Coupling between pelagic and benthic systems has been described in numerous shallow water communities. In Potter Cove, where pelagic primary production is low (not only during the Antarctic winter but also during the summer), the rich benthic community present there must depend on other food sources than phytoplankton. Over a year-round period we determined the abundance of the different seston particles which constituted the stomach contents of the Antarctic ascidian Cnemidocarpa verrucosa (Lesson, 1830) at Potter Cove. Stomach repletion was highest in November and lowest in June. Ascidians took in a wide range of particles from large detritus (macroalgal debris and faecal pellets) to minute particles < 5 μm. Large detritus and minute particles together represent the main percentage of contents throughout the year (mean 91%). Diatoms were a low percentage (mean 4.5%). Unidentified flagellates, dinoflagellates and coccolithophorids were scarce, with mean values lower than 4%. Among diatoms benthic species were more abundant in summer and pelagic ones prevailed from March to November. Resuspension of benthic material due to wind mixing and the input of allochthonous particles by currents are important mechanisms that ensure food for ascidians and the community of suspension feeders in Potter Cove. |
| author |
Esnal, Graciela Beatriz |
| author_facet |
Esnal, Graciela Beatriz |
| author_sort |
Esnal, Graciela Beatriz |
| title |
Diet components in the food of Antarctic ascidians living at low levels of primary production |
| title_short |
Diet components in the food of Antarctic ascidians living at low levels of primary production |
| title_full |
Diet components in the food of Antarctic ascidians living at low levels of primary production |
| title_fullStr |
Diet components in the food of Antarctic ascidians living at low levels of primary production |
| title_full_unstemmed |
Diet components in the food of Antarctic ascidians living at low levels of primary production |
| title_sort |
diet components in the food of antarctic ascidians living at low levels of primary production |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v16_n2_p123_Tatian http://hdl.handle.net/20.500.12110/paper_09541020_v16_n2_p123_Tatian |
| work_keys_str_mv |
AT esnalgracielabeatriz dietcomponentsinthefoodofantarcticascidianslivingatlowlevelsofprimaryproduction |
| _version_ |
1768545199131197440 |