Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage
Determining food web architecture and its seasonal cycles is a precondition for making predictions about Antarctic marine biodiversity under varying climate change scenarios. However, few scientific data concerning Antarctic food web structure, the species playing key roles in web stability and the...
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ftdoajarticles:oai:doaj.org/article:91eca31b72224b0689bbb340151dac75 2023-05-15T14:01:52+02:00 Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage Simona Sporta Caputi Giulio Careddu Edoardo Calizza Federico Fiorentino Deborah Maccapan Loreto Rossi Maria Letizia Costantini 2020-12-01T00:00:00Z https://doi.org/10.3389/fmars.2020.594454 https://doaj.org/article/91eca31b72224b0689bbb340151dac75 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2020.594454/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.594454 https://doaj.org/article/91eca31b72224b0689bbb340151dac75 Frontiers in Marine Science, Vol 7 (2020) Antarctica climate change food webs keystone species population-wide metrics seasonal sea-ice dynamics Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2020 ftdoajarticles https://doi.org/10.3389/fmars.2020.594454 2022-12-31T06:44:59Z Determining food web architecture and its seasonal cycles is a precondition for making predictions about Antarctic marine biodiversity under varying climate change scenarios. However, few scientific data concerning Antarctic food web structure, the species playing key roles in web stability and the community responses to changes in sea-ice dynamics are available. Based on C and N stable isotope analysis, we describe Antarctic benthic food webs and the diet of species occurring in shallow waters (Tethys Bay, Ross Sea) before and after seasonal sea-ice break-up. We hypothesized that the increased availability of primary producers (sympagic algae) following sea-ice break-up affects the diet of species and thus food web architecture. Basal resources had distinct isotopic signatures that did not change after sea-ice break-up, enabling a robust description of consumer diets based on Bayesian mixing models. Sympagic algae had the highest δ13C (∼−14‰) and red macroalgae the lowest (∼−37‰). Consumer isotopic niches and signatures changed after sea-ice break-up, reflecting the values of sympagic algae. Differences in food web topology were also observed. The number of taxa and the number of links per taxon were higher before the thaw than after it. After sea-ice break-up, sympagic inputs allowed consumers to specialize on abundant resources at lower trophic levels. Foraging optimization by consumers led to a simpler food web, with lower potential competition and shorter food chains. However, basal resources and Antarctic species such as the bivalve Adamussium colbecki and the sea-urchin Sterechinus neumayeri were central and highly connected both before and after the sea-ice break-up, thus playing key roles in interconnecting species and compartments in the web. Any disturbance affecting these species is expected to have cascading effects on the entire food web. The seasonal break-up of sea ice in Antarctica ensures the availability of resources that are limiting for coastal communities for the rest of the year. ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ross Sea Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Ross Sea Tethys Bay ENVELOPE(164.067,164.067,-74.683,-74.683) Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica climate change food webs keystone species population-wide metrics seasonal sea-ice dynamics Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Antarctica climate change food webs keystone species population-wide metrics seasonal sea-ice dynamics Science Q General. Including nature conservation geographical distribution QH1-199.5 Simona Sporta Caputi Giulio Careddu Edoardo Calizza Federico Fiorentino Deborah Maccapan Loreto Rossi Maria Letizia Costantini Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
topic_facet |
Antarctica climate change food webs keystone species population-wide metrics seasonal sea-ice dynamics Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Determining food web architecture and its seasonal cycles is a precondition for making predictions about Antarctic marine biodiversity under varying climate change scenarios. However, few scientific data concerning Antarctic food web structure, the species playing key roles in web stability and the community responses to changes in sea-ice dynamics are available. Based on C and N stable isotope analysis, we describe Antarctic benthic food webs and the diet of species occurring in shallow waters (Tethys Bay, Ross Sea) before and after seasonal sea-ice break-up. We hypothesized that the increased availability of primary producers (sympagic algae) following sea-ice break-up affects the diet of species and thus food web architecture. Basal resources had distinct isotopic signatures that did not change after sea-ice break-up, enabling a robust description of consumer diets based on Bayesian mixing models. Sympagic algae had the highest δ13C (∼−14‰) and red macroalgae the lowest (∼−37‰). Consumer isotopic niches and signatures changed after sea-ice break-up, reflecting the values of sympagic algae. Differences in food web topology were also observed. The number of taxa and the number of links per taxon were higher before the thaw than after it. After sea-ice break-up, sympagic inputs allowed consumers to specialize on abundant resources at lower trophic levels. Foraging optimization by consumers led to a simpler food web, with lower potential competition and shorter food chains. However, basal resources and Antarctic species such as the bivalve Adamussium colbecki and the sea-urchin Sterechinus neumayeri were central and highly connected both before and after the sea-ice break-up, thus playing key roles in interconnecting species and compartments in the web. Any disturbance affecting these species is expected to have cascading effects on the entire food web. The seasonal break-up of sea ice in Antarctica ensures the availability of resources that are limiting for coastal communities for the rest of the year. ... |
format |
Article in Journal/Newspaper |
author |
Simona Sporta Caputi Giulio Careddu Edoardo Calizza Federico Fiorentino Deborah Maccapan Loreto Rossi Maria Letizia Costantini |
author_facet |
Simona Sporta Caputi Giulio Careddu Edoardo Calizza Federico Fiorentino Deborah Maccapan Loreto Rossi Maria Letizia Costantini |
author_sort |
Simona Sporta Caputi |
title |
Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
title_short |
Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
title_full |
Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
title_fullStr |
Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
title_full_unstemmed |
Seasonal Food Web Dynamics in the Antarctic Benthos of Tethys Bay (Ross Sea): Implications for Biodiversity Persistence Under Different Seasonal Sea-Ice Coverage |
title_sort |
seasonal food web dynamics in the antarctic benthos of tethys bay (ross sea): implications for biodiversity persistence under different seasonal sea-ice coverage |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.594454 https://doaj.org/article/91eca31b72224b0689bbb340151dac75 |
long_lat |
ENVELOPE(164.067,164.067,-74.683,-74.683) |
geographic |
Antarctic The Antarctic Ross Sea Tethys Bay |
geographic_facet |
Antarctic The Antarctic Ross Sea Tethys Bay |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
op_source |
Frontiers in Marine Science, Vol 7 (2020) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2020.594454/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.594454 https://doaj.org/article/91eca31b72224b0689bbb340151dac75 |
op_doi |
https://doi.org/10.3389/fmars.2020.594454 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
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1766271921931943936 |