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A meta-analysis of seaweed impacts on seagrasses: generalities and knowledge gaps

2012-01Journal article Open Access
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dc.contributor.authorThomsen, Mads S.
dc.contributor.authorWernberg, Thomas
dc.contributor.authorEngelen, Aschwin
dc.contributor.authorTuya, Fernando
dc.contributor.authorVanderklift, Mat A.
dc.contributor.authorHolmer, Marianne
dc.contributor.authorMcGlathery, Karen J.
dc.contributor.authorArenas, Francisco
dc.contributor.authorKotta, Jonne
dc.contributor.authorSillimann, Brian R.
dc.date.accessioned2018-12-07T14:53:09Z
dc.date.available2018-12-07T14:53:09Z
dc.date.issued2012-01
dc.description.abstractSeagrasses are important habitat-formers and ecosystem engineers that are under threat from bloom-forming seaweeds. These seaweeds have been suggested to outcompete the seagrasses, particularly when facilitated by eutrophication, causing regime shifts where green meadows and clear waters are replaced with unstable sediments, turbid waters, hypoxia, and poor habitat conditions for fishes and invertebrates. Understanding the situations under which seaweeds impact seagrasses on local patch scales can help proactive management and prevent losses at greater scales. Here, we provide a quantitative review of available published manipulative experiments (all conducted at the patch-scale), to test which attributes of seaweeds and seagrasses (e.g., their abundances, sizes, morphology, taxonomy, attachment type, or origin) influence impacts. Weighted and unweighted meta-analyses (Hedges d metric) of 59 experiments showed generally high variability in attribute-impact relationships. Our main significant findings were that (a) abundant seaweeds had stronger negative impacts on seagrasses than sparse seaweeds, (b) unattached and epiphytic seaweeds had stronger impacts than 'rooted' seaweeds, and (c) small seagrass species were more susceptible than larger species. Findings (a) and (c) were rather intuitive. It was more surprising that 'rooted' seaweeds had comparatively small impacts, particularly given that this category included the infamous invasive Caulerpa species. This result may reflect that seaweed biomass and/or shading and metabolic by-products like anoxia and sulphides could be lower for rooted seaweeds. In conclusion, our results represent simple and robust first-order generalities about seaweed impacts on seagrasses. This review also documented a limited number of primary studies. We therefore identified major knowledge gaps that need to be addressed before general predictive models on seaweed-seagrass interactions can be build, in order to effectively protect seagrass habitats from detrimental competition from seaweeds.
dc.description.sponsorshipPortuguese Fundacao para a Ciencia e a Technologia; Fondo Europeo de Desarrollo Regional [PTDC/MAR/098069/2008]; Danish National Science Research Foundation; European Union [266445]; Estonian research projects [SF0180013s08, ESF8254]; National Science Foundation [BIO-OCE 105690]
dc.identifier.doi10.1371/journal.pone.0028595
dc.identifier.issn1932-6203
dc.identifier.urihttp://hdl.handle.net/10400.1/11378
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPublic Library Science
dc.subjectEelgrass zostera-marina
dc.subjectMacroalga chaetomorpha-linum
dc.subjectGracilaria-vermiculophylla
dc.subjectNutrient availability
dc.subjectThalassia-testudinum
dc.subjectCymodocea-nodosa
dc.subjectPlant invasions
dc.subjectUlva-rigida
dc.subjectDrift algae
dc.subjectDense mats
dc.titleA meta-analysis of seaweed impacts on seagrasses: generalities and knowledge gaps
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR%2F098069%2F2008/PT
oaire.citation.endPage28
oaire.citation.issue1
oaire.citation.startPage21
oaire.citation.titlePlos One
oaire.citation.volume7
oaire.fundingStream3599-PPCDT
person.familyNameEngelen
person.givenNameAschwin
person.identifier.ciencia-id911A-9A0C-744D
person.identifier.orcid0000-0002-9579-9606
person.identifier.ridM-3432-2013
person.identifier.scopus-author-id6701622770
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication33d5a223-f2c9-4c68-984f-9213f15a05b0
relation.isAuthorOfPublication.latestForDiscovery33d5a223-f2c9-4c68-984f-9213f15a05b0
relation.isProjectOfPublication7a0ef427-24d5-4461-a76d-e02002896292
relation.isProjectOfPublication.latestForDiscovery7a0ef427-24d5-4461-a76d-e02002896292

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