Keystone species: toward an operational concept for marine biodiversity conservation
International audience Various definitions and indices have been proposed in the literature to identify keystone species. In this study, we intended to make the concept of keystone species operational for marine biodiversity conservation. We used an exclusive definition of keystone species, based on...
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Online Access: | https://doi.org/10.1890/14-0306.1 https://hal.archives-ouvertes.fr/hal-01840230 |
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fttriple:oai:gotriple.eu:10670/1.okca31 2023-05-15T18:33:33+02:00 Keystone species: toward an operational concept for marine biodiversity conservation Valls, Audrey Coll, Marta Christensen, Villy MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD) 2015-02-01 https://doi.org/10.1890/14-0306.1 https://hal.archives-ouvertes.fr/hal-01840230 en eng HAL CCSD Ecological Society of America hal-01840230 doi:10.1890/14-0306.1 10670/1.okca31 https://hal.archives-ouvertes.fr/hal-01840230 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0012-9615 Ecological monographs Ecological monographs, Ecological Society of America, 2015, 85 (1), pp.29-47. ⟨10.1890/14-0306.1⟩ food-web structure Ecopath model classification tree index of keystoneness keystone species marine ecosystems Meta-analysis mixed-trophic impact rank correlation tests scoring method envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.1890/14-0306.1 2023-01-22T17:36:13Z International audience Various definitions and indices have been proposed in the literature to identify keystone species. In this study, we intended to make the concept of keystone species operational for marine biodiversity conservation. We used an exclusive definition of keystone species, based on the original concept of keystone predator, and derived a new functional index of keystoneness (KS) from an ecosystem-modeling approach. First, several KS indices were formulated, by combining measures of the mixed-trophic impact (MTI) and biomass of species. Then, a meta-analysis was performed, based on 101 published Ecopath food-web models, selected with a scoring method, and representative of the variety of marine ecosystems worldwide. The indices were applied to the models, and two statistical methods were compared to select the most promising KS index. Rank correlation tests were performed to assess the balance between the contribution of the impact and biomass components to the different KS indices. In addition, a classification tree was implemented, based on ecosystem-specific thresholds applied to the latter species traits, and used to confirm the identified keystone species. The selected index obtained the highest number of models with positive results from both the rank correlation tests and the classification tree. We also demonstrated the limitations of existing KS indices previously applied in the literature. Species were ranked according to their estimates of keystoneness with the selected KS index, so that potential keystone species were quantitatively identified in the 101 modeled food webs. The standardized modeling approach allowed for a comparison of the identified keystone species across models: cartilaginous fishes and toothed whales obtained the highest occurrences. Finally, the selected KS index was applied to the well-known case study of Prince William Sound (Alaska, USA). Potentially significant anthropogenic (fishing) impacts on keystone species were also considered and discussed. The ... Article in Journal/Newspaper toothed whales Alaska Unknown Ecological Monographs 85 1 29 47 |
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Open Polar |
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Unknown |
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language |
English |
topic |
food-web structure Ecopath model classification tree index of keystoneness keystone species marine ecosystems Meta-analysis mixed-trophic impact rank correlation tests scoring method envir geo |
spellingShingle |
food-web structure Ecopath model classification tree index of keystoneness keystone species marine ecosystems Meta-analysis mixed-trophic impact rank correlation tests scoring method envir geo Valls, Audrey Coll, Marta Christensen, Villy Keystone species: toward an operational concept for marine biodiversity conservation |
topic_facet |
food-web structure Ecopath model classification tree index of keystoneness keystone species marine ecosystems Meta-analysis mixed-trophic impact rank correlation tests scoring method envir geo |
description |
International audience Various definitions and indices have been proposed in the literature to identify keystone species. In this study, we intended to make the concept of keystone species operational for marine biodiversity conservation. We used an exclusive definition of keystone species, based on the original concept of keystone predator, and derived a new functional index of keystoneness (KS) from an ecosystem-modeling approach. First, several KS indices were formulated, by combining measures of the mixed-trophic impact (MTI) and biomass of species. Then, a meta-analysis was performed, based on 101 published Ecopath food-web models, selected with a scoring method, and representative of the variety of marine ecosystems worldwide. The indices were applied to the models, and two statistical methods were compared to select the most promising KS index. Rank correlation tests were performed to assess the balance between the contribution of the impact and biomass components to the different KS indices. In addition, a classification tree was implemented, based on ecosystem-specific thresholds applied to the latter species traits, and used to confirm the identified keystone species. The selected index obtained the highest number of models with positive results from both the rank correlation tests and the classification tree. We also demonstrated the limitations of existing KS indices previously applied in the literature. Species were ranked according to their estimates of keystoneness with the selected KS index, so that potential keystone species were quantitatively identified in the 101 modeled food webs. The standardized modeling approach allowed for a comparison of the identified keystone species across models: cartilaginous fishes and toothed whales obtained the highest occurrences. Finally, the selected KS index was applied to the well-known case study of Prince William Sound (Alaska, USA). Potentially significant anthropogenic (fishing) impacts on keystone species were also considered and discussed. The ... |
author2 |
MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD) |
format |
Article in Journal/Newspaper |
author |
Valls, Audrey Coll, Marta Christensen, Villy |
author_facet |
Valls, Audrey Coll, Marta Christensen, Villy |
author_sort |
Valls, Audrey |
title |
Keystone species: toward an operational concept for marine biodiversity conservation |
title_short |
Keystone species: toward an operational concept for marine biodiversity conservation |
title_full |
Keystone species: toward an operational concept for marine biodiversity conservation |
title_fullStr |
Keystone species: toward an operational concept for marine biodiversity conservation |
title_full_unstemmed |
Keystone species: toward an operational concept for marine biodiversity conservation |
title_sort |
keystone species: toward an operational concept for marine biodiversity conservation |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://doi.org/10.1890/14-0306.1 https://hal.archives-ouvertes.fr/hal-01840230 |
genre |
toothed whales Alaska |
genre_facet |
toothed whales Alaska |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0012-9615 Ecological monographs Ecological monographs, Ecological Society of America, 2015, 85 (1), pp.29-47. ⟨10.1890/14-0306.1⟩ |
op_relation |
hal-01840230 doi:10.1890/14-0306.1 10670/1.okca31 https://hal.archives-ouvertes.fr/hal-01840230 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1890/14-0306.1 |
container_title |
Ecological Monographs |
container_volume |
85 |
container_issue |
1 |
container_start_page |
29 |
op_container_end_page |
47 |
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1766218177321107456 |