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
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/18141
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/18141
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling 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 Técnicas2025-10-22T12:15:30Zoai: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:34982025-10-22 12:15:30.741CONICET 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
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Public Library of Science
publisher.none.fl_str_mv Public Library of Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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