A review of three decades of research on the invasive kelp Undaria pinnatifida in Australasia: An assessment of its success, impacts and status as one of the world's worst invaders

South, Paul M.; Floerl, Oliver; Forrest, Barrie M.; Thomsen, Mads S.

doi:10.1016/j.marenvres.2017.09.015

Cited by 74 publications

(69 citation statements)

References 125 publications

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“…via boating activities (Epstein & Smale, 2017b). Human‐mediated spread, notably through shipping (commercial, fishing or leisure boats), has been pointed out as a main vector of spread in Australasia (South et al., 2017, and references herein). Similar to that, based on our study, in Brittany, 40 years after its introduction, the overall connectivity pattern of U. pinnatifida at a regional scale appears to be still largely driven by the effects of human‐mediated dispersal, notably through leisure boat movements.…”

Section: Discussionmentioning

confidence: 99%

“…U. pinnatifida is one of 346 seaweed species that have been classified as invasive (Thomsen, Wernberg, South, & Schiel, 2016). Although being a very successful NIS, its impacts on the shallow coastal communities seem often moderate and/or limited to taxa with similar properties both in Australia and Europe (Epstein & Smale, 2017b; South et al., 2017). …”

Section: Introductionmentioning

confidence: 99%

“…However, several life‐history traits have been identified as key to rendering U. pinnatifida a successful invader (South et al., 2017; Wallentinus, 2007). It is an opportunistic species which can rapidly colonize disturbed habitats, as shown by experimental removal of native canopies (De Leij, Epstein, Brown, & Smale, 2017; South & Thomsen, 2016; Valentine & Johnson, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it displays high fecundity and a short generation time (e.g., two generations per year in Brittany [north western France], Castric‐Fey, Beaupoil, Bouchain, Pradier, & L'Hardy‐Halos, 1999). It can tolerate a wide range of physiological conditions (see references in South et al., 2017) and displays a broad ecological niche (Murphy, Johnson, & Viard, 2017). On the other hand, two characteristics are expected to limit its expansion.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it is uncertain whether the sustainable establishment of the populations found in the wild, most often characterized by low population density (L. Lévêque & F. Viard, unpublished data), still relies on the dense populations found in the nearby marinas or farms. This knowledge is needed to address concerns related to possible intensification of this kelp's cultivation in Europe, as well as to define targets for management strategies to limit its spread (South et al., 2017). On a broader scale, U .…”

Section: Introductionmentioning

confidence: 99%

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Population genomics of the introduced and cultivated Pacific kelp Undaria pinnatifida: Marinas—not farms—drive regional connectivity and establishment in natural rocky reefs

Guzinski

Ballenghien

Daguin‐Thiébaut

et al. 2018

Evolutionary Applications

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Ports and farms are well‐known primary introduction hot spots for marine non‐indigenous species (NIS). The extent to which these anthropogenic habitats are sustainable sources of propagules and influence the evolution of NIS in natural habitats was examined in the edible seaweed Undaria pinnatifida, native to Asia and introduced to Europe in the 1970s. Following its deliberate introduction 40 years ago along the French coast of the English Channel, this kelp is now found in three contrasting habitat types: farms, marinas and natural rocky reefs. In the light of the continuous spread of this NIS, it is imperative to better understand the processes behind its sustainable establishment in the wild. In addition, developing effective management plans to curtail the spread of U. pinnatifida requires determining how the three types of populations interact with one another. In addition to an analysis using microsatellite markers, we developed, for the first time in a kelp, a ddRAD‐sequencing technique to genotype 738 individuals sampled in 11 rocky reefs, 12 marinas, and two farms located along ca. 1,000 km of coastline. As expected, the RAD‐seq panel showed more power than the microsatellite panel for identifying fine‐grained patterns. However, both panels demonstrated habitat‐specific properties of the study populations. In particular, farms displayed very low genetic diversity and no inbreeding conversely to populations in marinas and natural rocky reefs. In addition, strong, but chaotic regional genetic structure, was revealed, consistent with human‐mediated dispersal (e.g., leisure boating). We also uncovered a tight relationship between populations in rocky reefs and those in nearby marinas, but not with nearby farms, suggesting spillover from marinas into the wild. At last, a temporal survey spanning 20 generations showed that wild populations are now self‐sustaining, albeit there was no evidence for local adaptation to any of the three habitats. These findings highlight that limiting the spread of U. pinnatifida requires efficient management policies that also target marinas.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Population genomics of the introduced and cultivated Pacific kelp Undaria pinnatifida: Marinas—not farms—drive regional connectivity and establishment in natural rocky reefs

Guzinski

Ballenghien

Daguin‐Thiébaut

et al. 2018

Evolutionary Applications

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Organic matter derived from kelp supports a large proportion of biomass in temperate rocky reef fish communities: Implications for ecosystem‐based management

Udy

Wing

O’Connell-Milne

et al. 2019

Aquatic Conservation

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1. The relative availability of alternative organic matter sources directly influences trophic interactions within ecological communities. As differences in trophic ecology can alter the productivity of communities, understanding spatial variability in trophic structure, and the drivers of variability, is vital for implementing effective ecosystem-based management.2. Bulk stable isotope analysis (δ 13 C and δ 15 N) and mass balance calculations were used to examine patterns in the contribution of organic matter derived from macroalgae to food webs supporting temperate reef fish communities in two contrasting coastal waterways on the South Island of New Zealand: Fiordland and the Marlborough Sounds. Ten fish species common to both regions were compared, with up to 40% less organic matter from macroalgae supporting omnivorous species in the Marlborough Sounds. The largest differences in trophic position were found in those species exploited by fisheries.3. Furthermore, stratified surveys of abundance and species biomass combined with trophic position data were used to calculate regional differences in the contribution of macroalgae to whole fish communities in terms of density of biomass. In Fiordland, over 77% of the biomass of exploited reef fishes was supported by macroalgae, compared with 31% in the Marlborough Sounds. 4. Surveys of macroalgal density and species composition in the two regions indicated that regional differences in trophodynamics may be explained by a lack of macroalgal inputs to the food web in the Marlborough Sounds.5. The findings demonstrate large regional differences in the incorporation of benthic and pelagic sources of organic matter to food webs supporting reef fish communities, highlighting the need for ecosystem-based approaches to management to recognize spatial variability in primary production supporting coastal food webs.

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Long‐term community shifts driven by local extinction of an iconic foundation species following an extreme marine heatwave

Montie

Thomsen

2023

Ecology and Evolution

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A review of three decades of research on the invasive kelp Undaria pinnatifida in Australasia: An assessment of its success, impacts and status as one of the world's worst invaders

Cited by 74 publications

References 125 publications

Population genomics of the introduced and cultivated Pacific kelp Undaria pinnatifida: Marinas—not farms—drive regional connectivity and establishment in natural rocky reefs

Population genomics of the introduced and cultivated Pacific kelp Undaria pinnatifida: Marinas—not farms—drive regional connectivity and establishment in natural rocky reefs

Organic matter derived from kelp supports a large proportion of biomass in temperate rocky reef fish communities: Implications for ecosystem‐based management

Long‐term community shifts driven by local extinction of an iconic foundation species following an extreme marine heatwave

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