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...
Published in: | Frontiers in Marine Science |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media SA
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/11573/1477109 https://doi.org/10.3389/fmars.2020.594454 |
id |
ftunivromairis:oai:iris.uniroma1.it:11573/1477109 |
---|---|
record_format |
openpolar |
spelling |
ftunivromairis:oai:iris.uniroma1.it:11573/1477109 2024-02-27T08:35:08+00:00 Seasonal food web dynamics in the Antarctic benthos of Tethys Bay (Ross Sea). Implications for biodiversity persistence under different seasonal sea-ice coverage Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia 2020 http://hdl.handle.net/11573/1477109 https://doi.org/10.3389/fmars.2020.594454 eng eng Frontiers Media SA place:Lausanne info:eu-repo/semantics/altIdentifier/wos/WOS:000600666700001 volume:7 numberofpages:18 journal:FRONTIERS IN MARINE SCIENCE http://hdl.handle.net/11573/1477109 doi:10.3389/fmars.2020.594454 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85098199591 info:eu-repo/semantics/openAccess Antarctica climate change food web keystone specie population-wide metric seasonal sea-ice dynamic stable isotope trophic interactions info:eu-repo/semantics/article 2020 ftunivromairis https://doi.org/10.3389/fmars.2020.594454 2024-01-31T18:05:56Z 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 Sapienza Università di Roma: CINECA IRIS Antarctic Ross Sea Tethys Bay ENVELOPE(164.067,164.067,-74.683,-74.683) The Antarctic Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
Antarctica climate change food web keystone specie population-wide metric seasonal sea-ice dynamic stable isotope trophic interactions |
spellingShingle |
Antarctica climate change food web keystone specie population-wide metric seasonal sea-ice dynamic stable isotope trophic interactions Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia 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 web keystone specie population-wide metric seasonal sea-ice dynamic stable isotope trophic interactions |
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. ... |
author2 |
Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia |
format |
Article in Journal/Newspaper |
author |
Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia |
author_facet |
Sporta Caputi, Simona Careddu, Giulio Calizza, Edoardo Fiorentino, Federico Maccapan, Deborah Rossi, Loreto Costantini, Maria Letizia |
author_sort |
Sporta Caputi, Simona |
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 SA |
publishDate |
2020 |
url |
http://hdl.handle.net/11573/1477109 https://doi.org/10.3389/fmars.2020.594454 |
long_lat |
ENVELOPE(164.067,164.067,-74.683,-74.683) |
geographic |
Antarctic Ross Sea Tethys Bay The Antarctic |
geographic_facet |
Antarctic Ross Sea Tethys Bay The Antarctic |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000600666700001 volume:7 numberofpages:18 journal:FRONTIERS IN MARINE SCIENCE http://hdl.handle.net/11573/1477109 doi:10.3389/fmars.2020.594454 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85098199591 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2020.594454 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1792041590807592960 |