Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit
Autor(a) principal: | |
---|---|
Data de Publicação: | 2009 |
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/10400.1/4139 |
Resumo: | The negative effects of disturbances on the long-term persistence of populations may be more severe in marginal populations, i.e. those occurring at the boundaries of geographical and eco- logical distribution ranges. Human trampling is an important source of anthropogenic disturbance for intertidal assemblages. Effects of human trampling on intertidal rocky shore assemblages dominated by Ascophyllum nodosum (L.) Le Jol. at its southern distributional limit in Europe were tested exper- imentally. Four different intensities of trampling disturbances were applied to experimental areas, over a period of 5 mo. Percentage cover of A. nodosum and associated organisms was quantified dur- ing the disturbance period and for a recovery period of 1 yr. The 2 highest trampling intensities dras- tically reduced the cover of A. nodosum. Trampling also negatively affected Fucus vesiculosus and understorey species, while indirectly allowing colonisation by ephemeral green algae. One year after the end of disturbance, A. nodosum assemblages in the highest disturbance intensity areas were still significantly different from assemblages in the control and lowest disturbance intensity areas. These results were mainly driven by a switch in the dominant canopy species, from A. nodosum to F. vesicu- losus. Results obtained in this study show that disturbance by human trampling negatively affects A. nodosum assemblages and that the effects are dependent on trampling intensity. These findings highlight the risk of local extinction imposed on these populations by anthropogenic disturbance, and the consequent need for protection measures for such sensitive populations. |
id |
RCAP_c97be1669d852d1f599143895fce8261 |
---|---|
oai_identifier_str |
oai:sapientia.ualg.pt:10400.1/4139 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
|
spelling |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limitAscophyllum nodosumTrampling disturbanceDistributional range limitsThe negative effects of disturbances on the long-term persistence of populations may be more severe in marginal populations, i.e. those occurring at the boundaries of geographical and eco- logical distribution ranges. Human trampling is an important source of anthropogenic disturbance for intertidal assemblages. Effects of human trampling on intertidal rocky shore assemblages dominated by Ascophyllum nodosum (L.) Le Jol. at its southern distributional limit in Europe were tested exper- imentally. Four different intensities of trampling disturbances were applied to experimental areas, over a period of 5 mo. Percentage cover of A. nodosum and associated organisms was quantified dur- ing the disturbance period and for a recovery period of 1 yr. The 2 highest trampling intensities dras- tically reduced the cover of A. nodosum. Trampling also negatively affected Fucus vesiculosus and understorey species, while indirectly allowing colonisation by ephemeral green algae. One year after the end of disturbance, A. nodosum assemblages in the highest disturbance intensity areas were still significantly different from assemblages in the control and lowest disturbance intensity areas. These results were mainly driven by a switch in the dominant canopy species, from A. nodosum to F. vesicu- losus. Results obtained in this study show that disturbance by human trampling negatively affects A. nodosum assemblages and that the effects are dependent on trampling intensity. These findings highlight the risk of local extinction imposed on these populations by anthropogenic disturbance, and the consequent need for protection measures for such sensitive populations.Inter ResearchSapientiaAraújo, R.Vaselli, S.Almeida, M.Serrão, EsterSousa-Pinto, I.2014-05-30T14:29:29Z20092014-05-21T13:20:20Z2009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/4139engAraújo, R.; Vaselli, S.; Almeida, M.; Serrão, E.A.; Sousa-Pinto, I.Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit, Marine Ecology Progress Series, 378, Mar. 2012, 81-92, 20090171-8630AUT: ESE00527;http://dx.doi.org/10.3354/meps07814info: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:RCAAP2023-07-24T10:15:13ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
title |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
spellingShingle |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit Araújo, R. Ascophyllum nodosum Trampling disturbance Distributional range limits |
title_short |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
title_full |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
title_fullStr |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
title_full_unstemmed |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
title_sort |
Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit |
author |
Araújo, R. |
author_facet |
Araújo, R. Vaselli, S. Almeida, M. Serrão, Ester Sousa-Pinto, I. |
author_role |
author |
author2 |
Vaselli, S. Almeida, M. Serrão, Ester Sousa-Pinto, I. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Araújo, R. Vaselli, S. Almeida, M. Serrão, Ester Sousa-Pinto, I. |
dc.subject.por.fl_str_mv |
Ascophyllum nodosum Trampling disturbance Distributional range limits |
topic |
Ascophyllum nodosum Trampling disturbance Distributional range limits |
description |
The negative effects of disturbances on the long-term persistence of populations may be more severe in marginal populations, i.e. those occurring at the boundaries of geographical and eco- logical distribution ranges. Human trampling is an important source of anthropogenic disturbance for intertidal assemblages. Effects of human trampling on intertidal rocky shore assemblages dominated by Ascophyllum nodosum (L.) Le Jol. at its southern distributional limit in Europe were tested exper- imentally. Four different intensities of trampling disturbances were applied to experimental areas, over a period of 5 mo. Percentage cover of A. nodosum and associated organisms was quantified dur- ing the disturbance period and for a recovery period of 1 yr. The 2 highest trampling intensities dras- tically reduced the cover of A. nodosum. Trampling also negatively affected Fucus vesiculosus and understorey species, while indirectly allowing colonisation by ephemeral green algae. One year after the end of disturbance, A. nodosum assemblages in the highest disturbance intensity areas were still significantly different from assemblages in the control and lowest disturbance intensity areas. These results were mainly driven by a switch in the dominant canopy species, from A. nodosum to F. vesicu- losus. Results obtained in this study show that disturbance by human trampling negatively affects A. nodosum assemblages and that the effects are dependent on trampling intensity. These findings highlight the risk of local extinction imposed on these populations by anthropogenic disturbance, and the consequent need for protection measures for such sensitive populations. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2009-01-01T00:00:00Z 2014-05-30T14:29:29Z 2014-05-21T13:20:20Z |
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/10400.1/4139 |
url |
http://hdl.handle.net/10400.1/4139 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Araújo, R.; Vaselli, S.; Almeida, M.; Serrão, E.A.; Sousa-Pinto, I.Effects of disturbance on marginal populations: Human trampling on Ascophyllum nodosum assemblages at its southern distribution limit, Marine Ecology Progress Series, 378, Mar. 2012, 81-92, 2009 0171-8630 AUT: ESE00527; http://dx.doi.org/10.3354/meps07814 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Inter Research |
publisher.none.fl_str_mv |
Inter Research |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
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 |
|
repository.mail.fl_str_mv |
|
_version_ |
1777303889031200768 |