Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs.
International audience Rats introduced on islands can affect ecosystem structure and function by feeding on terrestrial plants and both marine and terrestrial animals. The diet and trophic position of Rattus rattus introduced on Ile de la Possession (Iles Crozet) was assessed from two sites, accordi...
Published in: | Polar Biology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.science/hal-00597309 https://doi.org/10.1007/s00300-010-0867-z |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
Stable isotopes Food web Subantarctic island Introduced rodent Rattus rattus Diet [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
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Stable isotopes Food web Subantarctic island Introduced rodent Rattus rattus Diet [SDE.BE]Environmental Sciences/Biodiversity and Ecology Pisanu, Benoit Caut, Stephane Gutjahr, Sylvain Vernon, Philippe Chapuis, Jean Louis Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
topic_facet |
Stable isotopes Food web Subantarctic island Introduced rodent Rattus rattus Diet [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience Rats introduced on islands can affect ecosystem structure and function by feeding on terrestrial plants and both marine and terrestrial animals. The diet and trophic position of Rattus rattus introduced on Ile de la Possession (Iles Crozet) was assessed from two sites, according to the presence or absence of a king penguin colony. We used three complementary assays: macroanalyses of the stomach, faecal microhistology, and stable isotope analyses of d15N/d13C in liver. Near the rookery, spermatophytes contributed on average 50% (confidential interval: 23-75) to the diet based on isotopes, mainly consisting in reproductive parts of Poa spp., Agrostis magellanica, and Cerastium fontanum identified in faeces. Terrestrial animal preys were represented by insects that contributed 25% (0-56) in isotopes, dominated in faeces by caterpillars of Pringleophaga spp. and adult weevils. Bird remains were found in faeces, forming 18% (6-30) of isotopes. Terrestrial earthworms contributed to 7% (0-21), with chaetae observed in faeces. On the other site, spermatophytes represented 62% (51-73) of assimilated food in rats' livers, mainly formed by Poaceae and Acaena magellanica, insects by caterpillars [24% (10-39)], and terrestrial earthworms [13% (2-23)]. Our results suggest that rats, which were found at the top of terrestrial food chains, may have a direct role on a such simplified ecosystem, by preying on the most abundant and largest body-sized terrestrial invertebrates,--e.g. the keystone species Pringleophaga spp.--, and by feeding on both reproductive and vegetative parts of autochthonous and introduced plants. The discrepancies and usefulness of employing both isotopes and faecal analyses are discussed. |
author2 |
Centre d'Ecologie et des Sciences de la COnservation (CESCO) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centro de Investigaciones Biológicas (CSIC) Consejo Superior de Investigaciones Cientificas = Spanish National Research Council (CSIC) Ecosystèmes, biodiversité, évolution Rennes (ECOBIO) Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) IPEV 136 Ecobio CNRS ZA Antarctique et Subantarctique CSIC ANR-05-BDIV-0003,ALIENS,Assessment and Limitation of the Impacts of Exotic species in Nationwide insular Systems(2005) |
format |
Article in Journal/Newspaper |
author |
Pisanu, Benoit Caut, Stephane Gutjahr, Sylvain Vernon, Philippe Chapuis, Jean Louis |
author_facet |
Pisanu, Benoit Caut, Stephane Gutjahr, Sylvain Vernon, Philippe Chapuis, Jean Louis |
author_sort |
Pisanu, Benoit |
title |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
title_short |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
title_full |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
title_fullStr |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
title_full_unstemmed |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. |
title_sort |
introduced black rats rattus rattus on ile de la possession (iles crozet, subantarctic): diet and trophic position in food webs. |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-00597309 https://doi.org/10.1007/s00300-010-0867-z |
genre |
Polar Biology Rattus rattus |
genre_facet |
Polar Biology Rattus rattus |
op_source |
ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.science/hal-00597309 Polar Biology, 2011, 34 (2), pp.169-180. ⟨10.1007/s00300-010-0867-z⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-010-0867-z hal-00597309 https://hal.science/hal-00597309 doi:10.1007/s00300-010-0867-z |
op_doi |
https://doi.org/10.1007/s00300-010-0867-z |
container_title |
Polar Biology |
container_volume |
34 |
container_issue |
2 |
container_start_page |
169 |
op_container_end_page |
180 |
_version_ |
1790607096593514496 |
spelling |
ftinsu:oai:HAL:hal-00597309v1 2024-02-11T10:08:07+01:00 Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. Pisanu, Benoit Caut, Stephane Gutjahr, Sylvain Vernon, Philippe Chapuis, Jean Louis Centre d'Ecologie et des Sciences de la COnservation (CESCO) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centro de Investigaciones Biológicas (CSIC) Consejo Superior de Investigaciones Cientificas = Spanish National Research Council (CSIC) Ecosystèmes, biodiversité, évolution Rennes (ECOBIO) Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) IPEV 136 Ecobio CNRS ZA Antarctique et Subantarctique CSIC ANR-05-BDIV-0003,ALIENS,Assessment and Limitation of the Impacts of Exotic species in Nationwide insular Systems(2005) 2011 https://hal.science/hal-00597309 https://doi.org/10.1007/s00300-010-0867-z en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-010-0867-z hal-00597309 https://hal.science/hal-00597309 doi:10.1007/s00300-010-0867-z ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.science/hal-00597309 Polar Biology, 2011, 34 (2), pp.169-180. ⟨10.1007/s00300-010-0867-z⟩ Stable isotopes Food web Subantarctic island Introduced rodent Rattus rattus Diet [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2011 ftinsu https://doi.org/10.1007/s00300-010-0867-z 2024-01-24T17:24:06Z International audience Rats introduced on islands can affect ecosystem structure and function by feeding on terrestrial plants and both marine and terrestrial animals. The diet and trophic position of Rattus rattus introduced on Ile de la Possession (Iles Crozet) was assessed from two sites, according to the presence or absence of a king penguin colony. We used three complementary assays: macroanalyses of the stomach, faecal microhistology, and stable isotope analyses of d15N/d13C in liver. Near the rookery, spermatophytes contributed on average 50% (confidential interval: 23-75) to the diet based on isotopes, mainly consisting in reproductive parts of Poa spp., Agrostis magellanica, and Cerastium fontanum identified in faeces. Terrestrial animal preys were represented by insects that contributed 25% (0-56) in isotopes, dominated in faeces by caterpillars of Pringleophaga spp. and adult weevils. Bird remains were found in faeces, forming 18% (6-30) of isotopes. Terrestrial earthworms contributed to 7% (0-21), with chaetae observed in faeces. On the other site, spermatophytes represented 62% (51-73) of assimilated food in rats' livers, mainly formed by Poaceae and Acaena magellanica, insects by caterpillars [24% (10-39)], and terrestrial earthworms [13% (2-23)]. Our results suggest that rats, which were found at the top of terrestrial food chains, may have a direct role on a such simplified ecosystem, by preying on the most abundant and largest body-sized terrestrial invertebrates,--e.g. the keystone species Pringleophaga spp.--, and by feeding on both reproductive and vegetative parts of autochthonous and introduced plants. The discrepancies and usefulness of employing both isotopes and faecal analyses are discussed. Article in Journal/Newspaper Polar Biology Rattus rattus Institut national des sciences de l'Univers: HAL-INSU Polar Biology 34 2 169 180 |