Range expansion of a non-native, invasive macroalga Sargassum horneri (Turner) C. Agardh, 1820 in the eastern Pacific

Marks, Lindsay M.; Salinas-Ruiz, P.; Reed, Daniel C.; Holbrook, Sally J.; Culver, Carolynn S.; Engle, John M.; Kushner, David J.; Caselle, JE; Freiwald, Jan; Williams, Jonathan P.; Smith, Jayson R.; Aguilar-Rosas, Luis E.; Kaplanis, Nikolas J.

doi:10.3391/bir.2015.4.4.02

Cited by 43 publications

(41 citation statements)

References 10 publications

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“…For this ecoregion, the by-far most important donor area constitutes the Northwest Pacific (10), and an elevation of water temperatures in the Northeast Pacific will increase the environmental match of both regions, resulting in increased invasion probabilities. Indeed, a recent finding of the Asian macroalga Sargassum horneri at the West Coast of Mexico and the United States is likely is a consequence of this increased environmental match (30), which further supports our model predictions.…”

Section: Discussionsupporting

confidence: 79%

Predicting the spread of marine species introduced by global shipping

Seebens

Schwartz

Schupp

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

157

112

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The human-mediated translocation of species poses a distinct threat to nature, human health, and economy. Although existing models calculate the invasion probability of any species, frameworks for species-specific forecasts are still missing. Here, we developed a model approach using global ship movements and environmental conditions to simulate the successive global spread of marine alien species that allows predicting the identity of those species likely to arrive next in a given habitat. In a first step, we simulated the historical steppingstone spreading dynamics of 40 marine alien species and compared predicted and observed alien species ranges. With an accuracy of 77%, the model correctly predicted the presence/absence of an alien species in an ecoregion. Spreading dynamics followed a common pattern with an initial invasion of most suitable habitats worldwide and a subsequent spread into neighboring habitats. In a second step, we used the reported distribution of 97 marine algal species with a known invasion history, and six species causing harmful algal blooms, to determine the ecoregions most likely to be invaded next under climate warming. Cluster analysis revealed that species can be classified according to three characteristic spreading profiles: emerging species, high-risk species, and widespread species. For the North Sea, the model predictions could be confirmed because two of the predicted high-risk species have recently invaded the North Sea. This study highlights that even simple models considering only shipping intensities and habitat matches are able to correctly predict the identity of the next invading marine species. alien species | model predictions | species identity | marine ecoregion | climate change T he number of alien species transported by human assistance has increased rapidly during the last decades with serious consequences for native flora and fauna (1-3). These biological invasions are considered to be one of the major drivers of biodiversity changes (4-6). Once an unwanted alien species has naturalized in the new environment, it is nearly impossible to eradicate the species, and thus the mitigation of further introduction is the most efficient way of combating biological invasions (6, 7). However, a targeted monitoring and an efficient adaptive management requires knowledge about spreading dynamics of the next potential invaders and thus about the distribution of species, their invasiveness, and the likelihood of new introductions. Although all of these topics have been analyzed on their own, the potential to predict the spreading of alien species while combining these components remains to be tested.A large amount of recent introductions can be attributed to the intensified global trade and transport as many species were accidentally or deliberately translocated through the exchange of commodities or the movements of transportation means (8, 9). The amount of exchanged commodities and the intensity of global traffic have therefore been found to be a good predictor to model th...

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Section: Discussionsupporting

confidence: 79%

Predicting the spread of marine species introduced by global shipping

Seebens

Schwartz

Schupp

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

157

112

View full text Add to dashboard Cite

show abstract

“…However, the fact that S. horneri can be transported long distances when in its floating state by currents might contradict the phylogeographical barrier theory. The long‐distance drifting capacity of the floating biomass of S. horneri could explain the extensive distribution of S. horneri , including its appearance on the North American coastline (Marks et al ; Kaplanis et al ), which may lead to intra‐specific competition and crosses between different populations, as well as the shift in genetic structure of native populations.…”

Section: Discussionmentioning

confidence: 99%

Insights on the Sargassum horneri golden tides in the Yellow Sea inferred from morphological and molecular data

Liu

Wang

et al. 2018

Limnology & Oceanography

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Large‐scale drifting Sargassum biomass, known as golden tides, has caused considerable damage to the local environment and economy associated with the Yellow Sea of China. To understand the reoccurrence of Sargassum horneri golden tides in the Yellow Sea, large‐scale spatio‐temporal sampling was performed across nine cruises and five coastal surveys. Morphological data indicated that the floating S. horneri thalli with differing reproductive timing coexisted in the Yellow Sea. A total of 196 S. horneri samples had identical sequences of partial cox3 and rbcL‐S spacer region, revealing very low genetic diversity in the floating biomass. A total of 19 haplotypes for partial cox3 previously found in the Yellow Sea were not detected in our large‐scale sampling. Based on four novel mtDNA markers, the 196 samples could be further distinguished into two forms, which varied in proportions at various locations, but coexisted in each of the spatio‐temporal sampling. These results indicated that the floating Sargassum biomass in the Yellow Sea came from only two dominating haplotypes. The novel findings uncovered by this work will provide further insight into the underlying mechanisms of reoccurring golden tides in the Yellow Sea, and lead to the improved management of the Sargassum biomass.

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“…We conducted this study at Anacapa Island, one of the first locations in the Northern Channel Islands (NCI) where Sargassum horneri was documented in 2009 (Marks et al . ). Anacapa is the easternmost and warmest of the NCI (Caselle et al .…”

Section: Methodsmentioning

confidence: 97%

“…We conducted this study at Anacapa Island, one of the first locations in the Northern Channel Islands (NCI) where Sargassum horneri was documented in 2009 (Marks et al 2015). Anacapa is the easternmost and warmest of the NCI and is divided into three management zones defined by two natural breaks in the island: State Marine Reserve (SMR; no-take), State Marine Conservation Area (SMCA; commercial and recreational take of CA spiny lobsters and recreational take of pelagic finfish allowed), and Reference area (open to fishing; Fig.…”

Section: Study Locationmentioning

confidence: 99%

“…Native to eastern Asia, Sargassum horneri has recently invaded and become established throughout southern California, US, and Baja California, Mexico (Marks et al 2015). Using surveys from long-term monitoring programmes, we tracked the invasion on subtidal rocky reefs at Anacapa Island where a system of no-take and partial-take MPAs has been established ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Marine management affects the invasion success of a non‐native species in a temperate reef system in California, USA

2017

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Despite promises that 'healthy' marine systems show increased resilience, the effects of ecosystem management strategies on invasion success in marine systems is still unclear. We show that resistance to the invasive alga, Sargassum horneri, in a temperate reef system occurs through alternate mechanisms in different ecosystem states. In an old marine protected area (MPA), invasion of S. horneri was suppressed, likely due to competitive pressure from native algae, resulting from protection of urchin predators. In a nearby fished urchin barren, invasion of S. horneri was also suppressed, due to herbivory by urchins whose predators are fished. Within newer MPAs with intermediate levels of interacting species, S. horneri was abundant. Here, neither competition from native algae nor herbivory was sufficient to prevent invasion. We confirm that invasion in marine systems is complex and show that multiple mechanisms in single systems must be considered when investigating biotic resistance hypotheses.

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Range expansion of a non-native, invasive macroalga Sargassum horneri (Turner) C. Agardh, 1820 in the eastern Pacific

Cited by 43 publications

References 10 publications

Predicting the spread of marine species introduced by global shipping

Predicting the spread of marine species introduced by global shipping

Insights on the Sargassum horneri golden tides in the Yellow Sea inferred from morphological and molecular data

Marine management affects the invasion success of a non‐native species in a temperate reef system in California, USA

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