Multiple Stressor Differential Tolerances: Possible Implications at the Population Level
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/108851 https://doi.org/10.1371/journal.pone.0151847 |
Resumo: | The probability of the most sensitive genotypes being eliminated from a population due to a contaminant pulse--genetic erosion--is negatively associated to the within-genotype variation. A sensitive genotype with a small phenotypic variation would be more prone to be lost-a critically sensitive genotype. Furthermore, natural populations inhabiting contaminated sites are usually exposed to several pollutants. Such co- or sequential exposure can have severe effects if at least some tolerant clonal lineages surviving one contaminant are sensitive to the others. Such an inverse relationship coupled with a low within-genotype variation potentially enhances genetic erosion. Accordingly, this study evaluated co-tolerance and the occurrence of clonal lineages critically sensitive to 48-hours lethal exposures of copper, zinc, cobalt, and chromium among eight clonal lineages of the cladocerans Daphnia longispina. Median lethal concentrations (LC50) of each metal were found to have the potential to provoke genetic erosion. Pairwise comparisons of LC50, from the eight clonal lineages, revealed neither negative nor positive correlations (r ≤ |0.56|; p ≥ 0.18), but inversely sensitive clonal lineages were found for all pairs of metals. Therefore, besides having the potential to eliminate critically sensitive clonal lineages in a first intermediately lethal pulse, all tested metals may provoke further losses of clonal lineages in an already genetically eroded population. |
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Multiple Stressor Differential Tolerances: Possible Implications at the Population LevelAnimalsDaphniaEnvironmental ExposureExtinction, BiologicalMetals, HeavyPopulation DynamicsGenetic VariationStress, PhysiologicalThe probability of the most sensitive genotypes being eliminated from a population due to a contaminant pulse--genetic erosion--is negatively associated to the within-genotype variation. A sensitive genotype with a small phenotypic variation would be more prone to be lost-a critically sensitive genotype. Furthermore, natural populations inhabiting contaminated sites are usually exposed to several pollutants. Such co- or sequential exposure can have severe effects if at least some tolerant clonal lineages surviving one contaminant are sensitive to the others. Such an inverse relationship coupled with a low within-genotype variation potentially enhances genetic erosion. Accordingly, this study evaluated co-tolerance and the occurrence of clonal lineages critically sensitive to 48-hours lethal exposures of copper, zinc, cobalt, and chromium among eight clonal lineages of the cladocerans Daphnia longispina. Median lethal concentrations (LC50) of each metal were found to have the potential to provoke genetic erosion. Pairwise comparisons of LC50, from the eight clonal lineages, revealed neither negative nor positive correlations (r ≤ |0.56|; p ≥ 0.18), but inversely sensitive clonal lineages were found for all pairs of metals. Therefore, besides having the potential to eliminate critically sensitive clonal lineages in a first intermediately lethal pulse, all tested metals may provoke further losses of clonal lineages in an already genetically eroded population.Public Library of Science2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/108851http://hdl.handle.net/10316/108851https://doi.org/10.1371/journal.pone.0151847eng1932-6203Venâncio, CátiaRibeiro, RuiSoares, AmadeuLopes, Isabelinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-09-21T08:56:07Zoai:estudogeral.uc.pt:10316/108851Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:25:05.654196Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
title |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
spellingShingle |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level Venâncio, Cátia Animals Daphnia Environmental Exposure Extinction, Biological Metals, Heavy Population Dynamics Genetic Variation Stress, Physiological |
title_short |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
title_full |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
title_fullStr |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
title_full_unstemmed |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
title_sort |
Multiple Stressor Differential Tolerances: Possible Implications at the Population Level |
author |
Venâncio, Cátia |
author_facet |
Venâncio, Cátia Ribeiro, Rui Soares, Amadeu Lopes, Isabel |
author_role |
author |
author2 |
Ribeiro, Rui Soares, Amadeu Lopes, Isabel |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Venâncio, Cátia Ribeiro, Rui Soares, Amadeu Lopes, Isabel |
dc.subject.por.fl_str_mv |
Animals Daphnia Environmental Exposure Extinction, Biological Metals, Heavy Population Dynamics Genetic Variation Stress, Physiological |
topic |
Animals Daphnia Environmental Exposure Extinction, Biological Metals, Heavy Population Dynamics Genetic Variation Stress, Physiological |
description |
The probability of the most sensitive genotypes being eliminated from a population due to a contaminant pulse--genetic erosion--is negatively associated to the within-genotype variation. A sensitive genotype with a small phenotypic variation would be more prone to be lost-a critically sensitive genotype. Furthermore, natural populations inhabiting contaminated sites are usually exposed to several pollutants. Such co- or sequential exposure can have severe effects if at least some tolerant clonal lineages surviving one contaminant are sensitive to the others. Such an inverse relationship coupled with a low within-genotype variation potentially enhances genetic erosion. Accordingly, this study evaluated co-tolerance and the occurrence of clonal lineages critically sensitive to 48-hours lethal exposures of copper, zinc, cobalt, and chromium among eight clonal lineages of the cladocerans Daphnia longispina. Median lethal concentrations (LC50) of each metal were found to have the potential to provoke genetic erosion. Pairwise comparisons of LC50, from the eight clonal lineages, revealed neither negative nor positive correlations (r ≤ |0.56|; p ≥ 0.18), but inversely sensitive clonal lineages were found for all pairs of metals. Therefore, besides having the potential to eliminate critically sensitive clonal lineages in a first intermediately lethal pulse, all tested metals may provoke further losses of clonal lineages in an already genetically eroded population. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/108851 http://hdl.handle.net/10316/108851 https://doi.org/10.1371/journal.pone.0151847 |
url |
http://hdl.handle.net/10316/108851 https://doi.org/10.1371/journal.pone.0151847 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1932-6203 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799134134351691776 |