Threat to macroalgal diversity: effects of the introduced green alga Caulerpa racemosa in the Mediterranean

Piazzi, Luigi; Ceccherelli, Giulia; Cinelli, Francesco

doi:10.3354/meps210149

Cited by 199 publications

(133 citation statements)

References 32 publications

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“…Studies to date have shown their effect on native macroflora and macrofauna (e.g., Piazzi et al, 2001;Balata et al, 2004;Cebrian et al, 2012;Deudero et al, 2010;Marbà et al, 2014) in terms of compositional changes and/or abundance shifts. However, they also have more cryptic impacts.…”

Section: Discussionmentioning

confidence: 99%

“…Another side of invasion biology is the assessment of the impact of alien species on native assemblages. This is usually performed by traditional community analysis methods, involving sampling, sorting, identification, and preparation of qualitative and/or quantitative inventories (e.g., Piazzi et al, 2001;Balata et al, 2004;Box et al, 2010). These tasks are time-consuming, strongly dependent on available taxonomic expertise, and in practice applied only to the analysis of the larger elements of the fauna and flora which constitute only a minor fraction of the diversity present (Blaxter, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding

Wangensteen

Cebrián

Palacín

et al. 2018

Marine Pollution Bulletin

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Running title: community-wide effects of invasive algae in MPAs Highlights  Hard-bottom communities dominated by invasive algae were studied with metabarcoding  A size-fractionation method is developed for the metabarcoding of complex samples  A modified primer set is used for the amplification of a COI fragment  A semiquantitave abundance index is proposed for statistical analyses  Results show effects of canopy-forming invasive algae on the underlying communities AbstractWe analysed with multigene (18S and COI) metabarcoding the effects of the proliferation of invasive seaweeds on rocky littoral communities in two Spanish Marine Protected Areas. The invasive algae studied were Caulerpa cylindracea, Lophocladia lallemandii and Asparagopsis armata. They are canopy-forming, landscape-dominant seaweeds, and we were interested in their effects on the underlying communities of meiobenthos and macrobenthos, separated in two size fractions through sieving. A new semiquantitative treatment of metabarcoding data is introduced. The results for both markers showed that the presence of the invasive seaweed had a significant effect on the understory communities for Lophocladia lallemandii and Asparagopsis armata but not for Caulerpa cylindracea. Likewise, changes in MOTU richness and diversity with invasion status varied in magnitude and direction depending on the alga considered. Our results showed that metabarcoding allows monitoring of the less conspicuous, but not least important, effects of the presence of dominant invasive seaweeds.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding

Wangensteen

Cebrián

Palacín

et al. 2018

Marine Pollution Bulletin

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“…In order to reduce time and resources for taxonomic determination of species, several surrogates have been suggested elsewhere (e.g. Phillips et al 1997;Piazzi et al 2001). A crucial attribute of surrogates has to be that they adequately represent pattern of spatial variability in assemblages at multiple spatial scales (Smale 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Helgol Mar Res (2013) 67:191-201 199 In contrast for multivariate analyses, this hypothesis was rejected except for the spatial scale of area. Macroalgae are useful organisms to monitor the environmental quality and to detect impacts due to anthropogenic activities (Piazzi et al 2001;Díez et al 2009). In order to reduce time and resources for taxonomic determination of species, several surrogates have been suggested elsewhere (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…In this context, understanding and quantifying the magnitude of the natural variability of assemblages is extremely important for implementing suitable monitoring programs and environmental impact studies (Underwood 1993;Chapman et al 1995). Due to their high diversity, sessile nature and wide distribution, macroalgae are considered good descriptors of rocky shore assemblages, and they are widely used to characterise and monitor coastal systems (Leliaert et al 2000;Piazzi et al 2002) and anthropogenic disturbances (Piazzi et al 2001;Díez et al 2009). Therefore, macroalgae have been included as key organisms in the determination of the ecological quality status of coastal water bodies in the European water Framework Directive (Ballesteros et al 2007;Juanes et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability in intertidal macroalgal assemblages on the North Portuguese coast: consistence between species and functional group approaches

et al. 2012

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Natural assemblages are variable in space and time; therefore, quantification of their variability is imperative to identify relevant scales for investigating natural or anthropogenic processes shaping these assemblages. We studied the variability of intertidal macroalgal assemblages on the North Portuguese coast, considering three spatial scales (from metres to 10 s of kilometres) following a hierarchical design. We tested the hypotheses that (1) spatial pattern will be invariant at all the studied scales and (2) spatial variability of macroalgal assemblages obtained by using species will be consistent with that obtained using functional groups. This was done considering as univariate variables: total biomass and number of taxa as well as biomass of the most important species and functional groups and as multivariate variables the structure of macroalgal assemblages, both considering species and functional groups. Most of the univariate results confirmed the first hypothesis except for the total number of taxa and foliose macroalgae that showed significant variability at the scale of site and area, respectively. In contrast, when multivariate patterns were examined, the first hypothesis was rejected except at the scale of 10 s of kilometres. Both uni-and multivariate results indicated that variation was larger at the smallest scale, and thus, smallscale processes seem to have more effect on spatial variability patterns. Macroalgal assemblages, both considering species and functional groups as surrogate, showed consistent spatial patterns, and therefore, the second hypothesis was confirmed. Consequently, functional groups may be considered a reliable biological surrogate to study changes on macroalgal assemblages at least along the investigated Portuguese coastline.

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Eyes Wide Shut

Galil¹

2017

Management of Marine Protected Areas

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Threat to macroalgal diversity: effects of the introduced green alga Caulerpa racemosa in the Mediterranean

Cited by 199 publications

References 32 publications

Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding

Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding

Spatial variability in intertidal macroalgal assemblages on the North Portuguese coast: consistence between species and functional group approaches

Eyes Wide Shut

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