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Which demographic traits determine population growth in the invasive brown seaweed Sargassum muticum?

2009-07Journal article Open access
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dc.contributor.authorEngelen, Aschwin
dc.contributor.authorSantos, Rui
dc.date.accessioned2018-12-07T14:53:22Z
dc.date.available2018-12-07T14:53:22Z
dc.date.issued2009-07
dc.description.abstract1. Life-history traits commonly associated with plant invasiveness are vegetative reproduction or r-selected traits such as short generation times and high rates of reproduction and individual growth. 2. We used matrix modelling to assess which demographic traits are important for the population growth of an invasive seaweed lacking vegetative reproduction and whether demographic and life-history strategies shift with increased dominance of the invader. The vital rates of one of the most successful invading seaweeds, Sargassum muticum, were investigated monthly for 2 years in intertidal pools dominated by the native brown seaweed Cystoseira humilis and by S. muticum, respectively. In order to speculate about the demographic mechanisms that determine invasiveness of S. muticum, and as the study sites were recently colonized, we assumed that C. humilis and S. muticum pools are proxies for early and late phases of invasion, respectively. 3. Both deterministic and stochastic matrix models showed positive rates of population growth, and rates were significantly higher in the pools dominated by S. muticum than in the ones dominated by C. humilis, indicating demographic changes with invader dominance. The variability of population growth rates and of reproductive and elasticity values of S. muticum was higher in the pools dominated by C. humilis, suggesting invader-driven stabilization of environmental conditions. Generation times of the species increased with invader dominance, supporting invader-stabilized environmental conditions. 4. Elasticity analyses revealed that the most important demographic trait for population growth rate at both levels of invader dominance was the persistence of the non-fertile adult fronds rather than reproduction or growth. No major shifts in the life-history strategy of S. muticum between levels of invader dominance were detected. 5. Synthesis. This study suggests that the invasiveness of S. muticum, a perennial invader without vegetative reproduction, relies on K- rather than r-selected traits and without drastic changes in life-history strategy between phases of invasion.
dc.description.sponsorshipEU [EVK3-CT-2001-00062]; FCT [POCI/MAR/55377/2004]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1111/j.1365-2745.2009.01501.x
dc.identifier.issn0022-0477
dc.identifier.urihttp://hdl.handle.net/10400.1/11476
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley-Blackwell Publishing, Inc
dc.relationThe invasive theory of the pest seaweed Sargassum muticum in Southern Portugal.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMatrix models
dc.subjectBiological invasions
dc.subjectAscophyllum-Nodosum
dc.subjectSpartina-Alterniflora
dc.subjectElasticity analysis
dc.subjectHalidrys-Siliquosa
dc.subjectBiotic invasions
dc.subjectPlant invasion
dc.subjectDynamics
dc.subjectEcosystem
dc.titleWhich demographic traits determine population growth in the invasive brown seaweed Sargassum muticum?
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleThe invasive theory of the pest seaweed Sargassum muticum in Southern Portugal.
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCI%2FMAR%2F55377%2F2004/PT
oaire.citation.endPage684
oaire.citation.issue4
oaire.citation.startPage675
oaire.citation.titleJournal of Ecology
oaire.citation.volume97
oaire.fundingStreamPOCI
person.familyNameEngelen
person.familyNameSantos
person.givenNameAschwin
person.givenNameRui
person.identifier42560
person.identifier.ciencia-id911A-9A0C-744D
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-9579-9606
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridM-3432-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id6701622770
person.identifier.scopus-author-id7201375018
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
relation.isAuthorOfPublication.latestForDiscovery84487ca8-404a-4584-81f0-3662c340d712
relation.isProjectOfPublication88ee0e77-9384-4f68-a81a-71c3575c4ab6
relation.isProjectOfPublication.latestForDiscovery88ee0e77-9384-4f68-a81a-71c3575c4ab6

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