Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past
- Autores
- Saporiti, Fabiana; Bearhop, Stuart; Silva, Laura Alejandra; Vales, Damián Gustavo; Zenteno, Lisette; Crespo, Enrique Alberto; Aguilar, Alex; Cardona, Luis
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The human exploitation of marine resources is characterised by the preferential removal of the largest species. Although this is expected to modify the structure of food webs, we have a relatively poor understanding of the potential consequences of such alteration. Here, we take advantage of a collection of ancient consumer tissues, using stable isotope analysis and SIBER to assess changes in the structure of coastal marine food webs in the South-western Atlantic through the second half of the Holocene as a result of the sequential exploitation of marine resources by hunter-gatherers, western sealers and modern fishermen. Samples were collected from shell middens and museums. Shells of both modern and archaeological intertidal herbivorous molluscs were used to reconstruct changes in the stable isotopic baseline, while modern and archaeological bones of the South American sea lion Otaria flavescens, South American fur seal Arctocephalus australis and Magellanic penguin Spheniscus magellanicus were used to analyse changes in the structure of the community of top predators. We found that ancient food webs were shorter, more redundant and more overlapping than current ones, both in northern-central Patagonia and southern Patagonia. These surprising results may be best explained by the huge impact of western sealing on pinnipeds during the fur trade period, rather than the impact of fishing on fish populations. As a consequence, the populations of pinnipeds at the end of the sealing period were likely well below the ecosystem's carrying capacity, which resulted in a release of intraspecific competition and a shift towards larger and higher trophic level prey. This in turn led to longer and less overlapping food webs.
Fil: Saporiti, Fabiana. Universidad de Barcelona; España
Fil: Bearhop, Stuart. University of Exeter; Reino Unido
Fil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Zenteno, Lisette. Universidad de Barcelona; España
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Aguilar, Alex. Universidad de Barcelona; España
Fil: Cardona, Luis. Universidad de Barcelona; España - Materia
-
FOOD CHAIN LENGTH
ANCIENT FOOD WEBS
ARCTOCEPHALUS AUSTRALIS
OTARIA FLAVESCENS
SPHENISCUS MAGELLANICUS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/18141
Ver los metadatos del registro completo
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CONICET Digital (CONICET) |
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Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the pastSaporiti, FabianaBearhop, StuartSilva, Laura AlejandraVales, Damián GustavoZenteno, LisetteCrespo, Enrique AlbertoAguilar, AlexCardona, LuisFOOD CHAIN LENGTHANCIENT FOOD WEBSARCTOCEPHALUS AUSTRALISOTARIA FLAVESCENSSPHENISCUS MAGELLANICUShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The human exploitation of marine resources is characterised by the preferential removal of the largest species. Although this is expected to modify the structure of food webs, we have a relatively poor understanding of the potential consequences of such alteration. Here, we take advantage of a collection of ancient consumer tissues, using stable isotope analysis and SIBER to assess changes in the structure of coastal marine food webs in the South-western Atlantic through the second half of the Holocene as a result of the sequential exploitation of marine resources by hunter-gatherers, western sealers and modern fishermen. Samples were collected from shell middens and museums. Shells of both modern and archaeological intertidal herbivorous molluscs were used to reconstruct changes in the stable isotopic baseline, while modern and archaeological bones of the South American sea lion Otaria flavescens, South American fur seal Arctocephalus australis and Magellanic penguin Spheniscus magellanicus were used to analyse changes in the structure of the community of top predators. We found that ancient food webs were shorter, more redundant and more overlapping than current ones, both in northern-central Patagonia and southern Patagonia. These surprising results may be best explained by the huge impact of western sealing on pinnipeds during the fur trade period, rather than the impact of fishing on fish populations. As a consequence, the populations of pinnipeds at the end of the sealing period were likely well below the ecosystem's carrying capacity, which resulted in a release of intraspecific competition and a shift towards larger and higher trophic level prey. This in turn led to longer and less overlapping food webs.Fil: Saporiti, Fabiana. Universidad de Barcelona; EspañaFil: Bearhop, Stuart. University of Exeter; Reino UnidoFil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Zenteno, Lisette. Universidad de Barcelona; EspañaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Aguilar, Alex. Universidad de Barcelona; EspañaFil: Cardona, Luis. Universidad de Barcelona; EspañaPublic Library of Science2014-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/18141Saporiti, Fabiana; Bearhop, Stuart; Silva, Laura Alejandra; Vales, Damián Gustavo; Zenteno, Lisette; et al.; Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past; Public Library of Science; Plos One; 9; 7; 7-2014; 1-13; e1031321932-6203CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/ark/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0103132info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0103132info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:42:47Zoai:ri.conicet.gov.ar:11336/18141instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:42:47.961CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
title |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
spellingShingle |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past Saporiti, Fabiana FOOD CHAIN LENGTH ANCIENT FOOD WEBS ARCTOCEPHALUS AUSTRALIS OTARIA FLAVESCENS SPHENISCUS MAGELLANICUS |
title_short |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
title_full |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
title_fullStr |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
title_full_unstemmed |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
title_sort |
Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past |
dc.creator.none.fl_str_mv |
Saporiti, Fabiana Bearhop, Stuart Silva, Laura Alejandra Vales, Damián Gustavo Zenteno, Lisette Crespo, Enrique Alberto Aguilar, Alex Cardona, Luis |
author |
Saporiti, Fabiana |
author_facet |
Saporiti, Fabiana Bearhop, Stuart Silva, Laura Alejandra Vales, Damián Gustavo Zenteno, Lisette Crespo, Enrique Alberto Aguilar, Alex Cardona, Luis |
author_role |
author |
author2 |
Bearhop, Stuart Silva, Laura Alejandra Vales, Damián Gustavo Zenteno, Lisette Crespo, Enrique Alberto Aguilar, Alex Cardona, Luis |
author2_role |
author author author author author author author |
dc.subject.none.fl_str_mv |
FOOD CHAIN LENGTH ANCIENT FOOD WEBS ARCTOCEPHALUS AUSTRALIS OTARIA FLAVESCENS SPHENISCUS MAGELLANICUS |
topic |
FOOD CHAIN LENGTH ANCIENT FOOD WEBS ARCTOCEPHALUS AUSTRALIS OTARIA FLAVESCENS SPHENISCUS MAGELLANICUS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The human exploitation of marine resources is characterised by the preferential removal of the largest species. Although this is expected to modify the structure of food webs, we have a relatively poor understanding of the potential consequences of such alteration. Here, we take advantage of a collection of ancient consumer tissues, using stable isotope analysis and SIBER to assess changes in the structure of coastal marine food webs in the South-western Atlantic through the second half of the Holocene as a result of the sequential exploitation of marine resources by hunter-gatherers, western sealers and modern fishermen. Samples were collected from shell middens and museums. Shells of both modern and archaeological intertidal herbivorous molluscs were used to reconstruct changes in the stable isotopic baseline, while modern and archaeological bones of the South American sea lion Otaria flavescens, South American fur seal Arctocephalus australis and Magellanic penguin Spheniscus magellanicus were used to analyse changes in the structure of the community of top predators. We found that ancient food webs were shorter, more redundant and more overlapping than current ones, both in northern-central Patagonia and southern Patagonia. These surprising results may be best explained by the huge impact of western sealing on pinnipeds during the fur trade period, rather than the impact of fishing on fish populations. As a consequence, the populations of pinnipeds at the end of the sealing period were likely well below the ecosystem's carrying capacity, which resulted in a release of intraspecific competition and a shift towards larger and higher trophic level prey. This in turn led to longer and less overlapping food webs. Fil: Saporiti, Fabiana. Universidad de Barcelona; España Fil: Bearhop, Stuart. University of Exeter; Reino Unido Fil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Zenteno, Lisette. Universidad de Barcelona; España Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Aguilar, Alex. Universidad de Barcelona; España Fil: Cardona, Luis. Universidad de Barcelona; España |
description |
The human exploitation of marine resources is characterised by the preferential removal of the largest species. Although this is expected to modify the structure of food webs, we have a relatively poor understanding of the potential consequences of such alteration. Here, we take advantage of a collection of ancient consumer tissues, using stable isotope analysis and SIBER to assess changes in the structure of coastal marine food webs in the South-western Atlantic through the second half of the Holocene as a result of the sequential exploitation of marine resources by hunter-gatherers, western sealers and modern fishermen. Samples were collected from shell middens and museums. Shells of both modern and archaeological intertidal herbivorous molluscs were used to reconstruct changes in the stable isotopic baseline, while modern and archaeological bones of the South American sea lion Otaria flavescens, South American fur seal Arctocephalus australis and Magellanic penguin Spheniscus magellanicus were used to analyse changes in the structure of the community of top predators. We found that ancient food webs were shorter, more redundant and more overlapping than current ones, both in northern-central Patagonia and southern Patagonia. These surprising results may be best explained by the huge impact of western sealing on pinnipeds during the fur trade period, rather than the impact of fishing on fish populations. As a consequence, the populations of pinnipeds at the end of the sealing period were likely well below the ecosystem's carrying capacity, which resulted in a release of intraspecific competition and a shift towards larger and higher trophic level prey. This in turn led to longer and less overlapping food webs. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-07 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/18141 Saporiti, Fabiana; Bearhop, Stuart; Silva, Laura Alejandra; Vales, Damián Gustavo; Zenteno, Lisette; et al.; Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past; Public Library of Science; Plos One; 9; 7; 7-2014; 1-13; e103132 1932-6203 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/18141 |
identifier_str_mv |
Saporiti, Fabiana; Bearhop, Stuart; Silva, Laura Alejandra; Vales, Damián Gustavo; Zenteno, Lisette; et al.; Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past; Public Library of Science; Plos One; 9; 7; 7-2014; 1-13; e103132 1932-6203 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/ark/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0103132 info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0103132 |
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openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf application/pdf application/pdf |
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Public Library of Science |
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Public Library of Science |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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