Time- and depth-wise trophic niche shifts in Antarctic benthos
Climate change is expected to affect resource-consumer interactions underlying stability in polar food webs. Polar benthic organisms have adapted to the marked seasonality characterising their habitats by concentrating foraging and reproductive activity in summer months, when inputs from sympagic an...
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ftpubmed:oai:pubmedcentral.nih.gov:5865725 2023-05-15T13:40:17+02:00 Time- and depth-wise trophic niche shifts in Antarctic benthos Calizza, Edoardo Careddu, Giulio Sporta Caputi, Simona Rossi, Loreto Costantini, Maria Letizia 2018-03-23 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865725/ http://www.ncbi.nlm.nih.gov/pubmed/29570741 https://doi.org/10.1371/journal.pone.0194796 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865725/ http://www.ncbi.nlm.nih.gov/pubmed/29570741 http://dx.doi.org/10.1371/journal.pone.0194796 © 2018 Calizza et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2018 ftpubmed https://doi.org/10.1371/journal.pone.0194796 2018-04-01T00:22:23Z Climate change is expected to affect resource-consumer interactions underlying stability in polar food webs. Polar benthic organisms have adapted to the marked seasonality characterising their habitats by concentrating foraging and reproductive activity in summer months, when inputs from sympagic and pelagic producers increase. While this enables the persistence of biodiverse food webs, the mechanisms underlying changes in resource use and nutrient transfer are poorly understood. Thus, our understanding of how temporal and spatial variations in the supply of resources may affect food web structure and functioning is limited. By means of C and N isotopic analyses of two key Antarctic benthic consumers (Adamussium colbecki, Bivalvia, and Sterechinus neumayeri, Echinoidea) and Bayesian mixing models, we describe changes in trophic niche and nutrient transfer across trophic levels associated with the long- and short-term diet and body size of specimens sampled in midsummer in both shallow and deep waters. Samplings occurred soon after the sea-ice broke up at Tethys Bay, an area characterised by extreme seasonality in sea-ice coverage and productivity in the Ross Sea. In the long term, the trophic niche was broader and variation between specimens was greater, with intermediate-size specimens generally consuming a higher number of resources than small and large specimens. The coupling of energy channels in the food web was consequently more direct than in the short term. Sediment and benthic algae were more frequently consumed in the long term, before the sea-ice broke up, while consumers specialised on sympagic algae and plankton in the short term. Regardless of the time scale, sympagic algae were more frequently consumed in shallow waters, while plankton was more frequently consumed in deep waters. Our results suggest a strong temporal relationship between resource availability and the trophic niche of benthic consumers in Antarctica. Potential climate-driven changes in the timing and quality of nutrient inputs may ... Text Antarc* Antarctic Antarctica Ross Sea Sea ice PubMed Central (PMC) Antarctic Ross Sea Tethys Bay ENVELOPE(164.067,164.067,-74.683,-74.683) PLOS ONE 13 3 e0194796 |
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Research Article Calizza, Edoardo Careddu, Giulio Sporta Caputi, Simona Rossi, Loreto Costantini, Maria Letizia Time- and depth-wise trophic niche shifts in Antarctic benthos |
topic_facet |
Research Article |
description |
Climate change is expected to affect resource-consumer interactions underlying stability in polar food webs. Polar benthic organisms have adapted to the marked seasonality characterising their habitats by concentrating foraging and reproductive activity in summer months, when inputs from sympagic and pelagic producers increase. While this enables the persistence of biodiverse food webs, the mechanisms underlying changes in resource use and nutrient transfer are poorly understood. Thus, our understanding of how temporal and spatial variations in the supply of resources may affect food web structure and functioning is limited. By means of C and N isotopic analyses of two key Antarctic benthic consumers (Adamussium colbecki, Bivalvia, and Sterechinus neumayeri, Echinoidea) and Bayesian mixing models, we describe changes in trophic niche and nutrient transfer across trophic levels associated with the long- and short-term diet and body size of specimens sampled in midsummer in both shallow and deep waters. Samplings occurred soon after the sea-ice broke up at Tethys Bay, an area characterised by extreme seasonality in sea-ice coverage and productivity in the Ross Sea. In the long term, the trophic niche was broader and variation between specimens was greater, with intermediate-size specimens generally consuming a higher number of resources than small and large specimens. The coupling of energy channels in the food web was consequently more direct than in the short term. Sediment and benthic algae were more frequently consumed in the long term, before the sea-ice broke up, while consumers specialised on sympagic algae and plankton in the short term. Regardless of the time scale, sympagic algae were more frequently consumed in shallow waters, while plankton was more frequently consumed in deep waters. Our results suggest a strong temporal relationship between resource availability and the trophic niche of benthic consumers in Antarctica. Potential climate-driven changes in the timing and quality of nutrient inputs may ... |
format |
Text |
author |
Calizza, Edoardo Careddu, Giulio Sporta Caputi, Simona Rossi, Loreto Costantini, Maria Letizia |
author_facet |
Calizza, Edoardo Careddu, Giulio Sporta Caputi, Simona Rossi, Loreto Costantini, Maria Letizia |
author_sort |
Calizza, Edoardo |
title |
Time- and depth-wise trophic niche shifts in Antarctic benthos |
title_short |
Time- and depth-wise trophic niche shifts in Antarctic benthos |
title_full |
Time- and depth-wise trophic niche shifts in Antarctic benthos |
title_fullStr |
Time- and depth-wise trophic niche shifts in Antarctic benthos |
title_full_unstemmed |
Time- and depth-wise trophic niche shifts in Antarctic benthos |
title_sort |
time- and depth-wise trophic niche shifts in antarctic benthos |
publisher |
Public Library of Science |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865725/ http://www.ncbi.nlm.nih.gov/pubmed/29570741 https://doi.org/10.1371/journal.pone.0194796 |
long_lat |
ENVELOPE(164.067,164.067,-74.683,-74.683) |
geographic |
Antarctic Ross Sea Tethys Bay |
geographic_facet |
Antarctic Ross Sea Tethys Bay |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865725/ http://www.ncbi.nlm.nih.gov/pubmed/29570741 http://dx.doi.org/10.1371/journal.pone.0194796 |
op_rights |
© 2018 Calizza et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0194796 |
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PLOS ONE |
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13 |
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3 |
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e0194796 |
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