Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers

Niche theory predicts that sympatric species should differentiate ecologically in order to co-exist and conspecifics will also differentiate to reduce intra-specific competition. As central-place foragers, colonial breeding seabirds represent an ideal model system to test this theory and examine the...

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Authors: Rosciano, Natalia Gimena, Polito, Michael J, Raya Rey, Andrea Nélida
Format: article
Status:Published version
Publication Date:2016
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/94715
Online Access:http://hdl.handle.net/11336/94715
Access Level:Open access
Keyword:EUDYPTES CHRYSOCOME CHRYSOCOME
ISLA DE LOS ESTADOS
NICHE PARTITIONING
SPHENISCUS MAGELLANICUS
STABLE ISOTOPES
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
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oai_identifier_str oai:ri.conicet.gov.ar:11336/94715
network_acronym_str AR
network_name_str Argentina
repository_id_str
spelling Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragersRosciano, Natalia GimenaPolito, Michael JRaya Rey, Andrea NélidaEUDYPTES CHRYSOCOME CHRYSOCOMEISLA DE LOS ESTADOSNICHE PARTITIONINGSPHENISCUS MAGELLANICUSSTABLE ISOTOPEShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Niche theory predicts that sympatric species should differentiate ecologically in order to co-exist and conspecifics will also differentiate to reduce intra-specific competition. As central-place foragers, colonial breeding seabirds represent an ideal model system to test this theory and examine the mechanism of niche segregation. We used GPS-TDlog devices for tracking and diving data and stable isotope analysis to examine patterns of inter- and intra-specific niche segregation among southern rockhopper penguins Eudyptes chrysocome chrysocome and Magellanic penguins Spheniscus magellanicus breeding on Isla de los Estados, Argentina, across 3 consecutive breeding seasons. Tracking data indicated strong inter-specific spatial segregation of foraging locations and little overlap. Diving data also highlighted vertical foraging niche segregation as female rockhopper penguins dove deeper than male and female Magellanic penguins. δ13C values supported the general pattern of habitat segregation, with lower values for female rock-hopper penguins that dove deeper and foraged off the shelf break. Female rockhopper penguins exhibited a lower relative trophic value (δ15N) than male and female Magellanic penguins, consistent with previous dietary studies of both species. These differences likely act to reduce competition between the 2 species during the breeding season, when they are constrained to exploit the resources around their colonies. In contrast, male and female Magellanic penguins shared a similar foraging niche as measured by areas used to forage, dive depths, relative habitat use and trophic values. The lack of sex-specific foraging niche segregation of Magellanic penguins at Isla de los Estados could be related to the availability of food in the area and/or the small population size.Fil: Rosciano, Natalia Gimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Polito, Michael J. Lousiana State University; Estados UnidosFil: Raya Rey, Andrea Nélida. Universidad Nacional de Tierra del Fuego; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaInter-Research2016-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/94715Rosciano, Natalia Gimena; Polito, Michael J; Raya Rey, Andrea Nélida; Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers; Inter-Research; Marine Ecology Progress Series; 548; 4-2016; 249-2620171-8630CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.int-res.com/abstracts/meps/v548/p249-262/info:eu-repo/semantics/altIdentifier/doi/10.3354/meps11689info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:18:09Zoai:ri.conicet.gov.ar:11336/94715instacron: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:34982024-05-08 14:18:10.002CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
title Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
spellingShingle Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
Rosciano, Natalia Gimena
EUDYPTES CHRYSOCOME CHRYSOCOME
ISLA DE LOS ESTADOS
NICHE PARTITIONING
SPHENISCUS MAGELLANICUS
STABLE ISOTOPES
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
title_short Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
title_full Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
title_fullStr Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
title_full_unstemmed Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
title_sort Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers
dc.creator.none.fl_str_mv Rosciano, Natalia Gimena
Polito, Michael J
Raya Rey, Andrea Nélida
author Rosciano, Natalia Gimena
author_facet Rosciano, Natalia Gimena
Polito, Michael J
Raya Rey, Andrea Nélida
author_role author
author2 Polito, Michael J
Raya Rey, Andrea Nélida
author2_role author
author
dc.subject.none.fl_str_mv EUDYPTES CHRYSOCOME CHRYSOCOME
ISLA DE LOS ESTADOS
NICHE PARTITIONING
SPHENISCUS MAGELLANICUS
STABLE ISOTOPES
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
topic EUDYPTES CHRYSOCOME CHRYSOCOME
ISLA DE LOS ESTADOS
NICHE PARTITIONING
SPHENISCUS MAGELLANICUS
STABLE ISOTOPES
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
description Niche theory predicts that sympatric species should differentiate ecologically in order to co-exist and conspecifics will also differentiate to reduce intra-specific competition. As central-place foragers, colonial breeding seabirds represent an ideal model system to test this theory and examine the mechanism of niche segregation. We used GPS-TDlog devices for tracking and diving data and stable isotope analysis to examine patterns of inter- and intra-specific niche segregation among southern rockhopper penguins Eudyptes chrysocome chrysocome and Magellanic penguins Spheniscus magellanicus breeding on Isla de los Estados, Argentina, across 3 consecutive breeding seasons. Tracking data indicated strong inter-specific spatial segregation of foraging locations and little overlap. Diving data also highlighted vertical foraging niche segregation as female rockhopper penguins dove deeper than male and female Magellanic penguins. δ13C values supported the general pattern of habitat segregation, with lower values for female rock-hopper penguins that dove deeper and foraged off the shelf break. Female rockhopper penguins exhibited a lower relative trophic value (δ15N) than male and female Magellanic penguins, consistent with previous dietary studies of both species. These differences likely act to reduce competition between the 2 species during the breeding season, when they are constrained to exploit the resources around their colonies. In contrast, male and female Magellanic penguins shared a similar foraging niche as measured by areas used to forage, dive depths, relative habitat use and trophic values. The lack of sex-specific foraging niche segregation of Magellanic penguins at Isla de los Estados could be related to the availability of food in the area and/or the small population size.
publishDate 2016
dc.date.none.fl_str_mv 2016-04
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/11336/94715
Rosciano, Natalia Gimena; Polito, Michael J; Raya Rey, Andrea Nélida; Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers; Inter-Research; Marine Ecology Progress Series; 548; 4-2016; 249-262
0171-8630
CONICET Digital
CONICET
url http://hdl.handle.net/11336/94715
identifier_str_mv Rosciano, Natalia Gimena; Polito, Michael J; Raya Rey, Andrea Nélida; Do penguins share? Evidence of foraging niche segregation between but not within two sympatric, central-place foragers; Inter-Research; Marine Ecology Progress Series; 548; 4-2016; 249-262
0171-8630
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.int-res.com/abstracts/meps/v548/p249-262/
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps11689
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
dc.publisher.none.fl_str_mv Inter-Research
publisher.none.fl_str_mv Inter-Research
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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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score 15,81155

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