The invasive seaweed <i>Sargassum filicinum</i> (Fucales, Phaeophyceae) is on the move along the Mexican Pacific coastline

Riosmena‐Rodríguez, Rafael; Boo, Ga Hun; López-Vivas, Juan Manuel; Hernández‐Velasco, Arturo; Sáenz–Arroyo, Andrea; Boo, Sung Ming

doi:10.1515/bot-2012-0120

Cited by 16 publications

(16 citation statements)

References 11 publications

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“…For example, in its native range in Japan, S. horneri grows from the intertidal to 20 m [62] but is most common on shallow reefs from the low intertidal to 4 m [63]. In Baja California, Mexico, near the southern extent of its invaded range, S. horneri has been reported to occur from the intertidal [64,65] to at least 8 m depth [66]. Perhaps robust subcanopy-forming macroalgal communities at Santa Catalina Island deter S. horneri at very deep (>20 m) and very shallow (<5 m) depths, while increased space and light available at intermediate depths allow S. horneri to thrive with minimal competition.…”

Section: Discussionmentioning

confidence: 99%

Niche Complementarity and Resistance to Grazing Promote the Invasion Success of Sargassum horneri in North America

2020

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Invasive species are a growing threat to conservation in marine ecosystems, yet we lack a predictive understanding of ecological factors that influence the invasiveness of exotic marine species. We used surveys and manipulative experiments to investigate how an exotic seaweed, Sargassum horneri, interacts with native macroalgae and herbivores off the coast of California. We asked whether the invasion (i.e., the process by which an exotic species exhibits rapid population growth and spread in the novel environment) of S. horneri is influenced by three mechanisms known to affect the invasion of exotic plants on land: competition, niche complementarity and herbivory. We found that the removal of S. horneri over 3.5 years from experimental plots had little effect on the biomass or taxonomic richness of the native algal community. Differences between removal treatments were apparent only in spring at the end of the experiment when S. horneri biomass was substantially higher than in previous sampling periods. Surveys across a depth range of 0–30 m revealed inverse patterns in the biomass of S. horneri and native subcanopy-forming macroalgae, with S. horneri peaking at intermediate depths (5–20 m) while the aggregated biomass of native species was greatest at shallow (<5 m) and deeper (>20 m) depths. The biomass of S. horneri and native algae also displayed different seasonal trends, and removal of S. horneri from experimental plots indicated the seasonality of native algae was largely unaffected by fluctuations in S. horneri. Results from grazing assays and surveys showed that native herbivores favor native kelp over Sargassum as a food source, suggesting that reduced palatability may help promote the invasion of S. horneri. The complementary life histories of S. horneri and native algae suggest that competition between them is generally weak, and that niche complementarity and resistance to grazing are more important in promoting the invasion success of S. horneri.

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Section: Discussionmentioning

confidence: 99%

Niche Complementarity and Resistance to Grazing Promote the Invasion Success of Sargassum horneri in North America

2020

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“…Sargassum horneri is known to be the major golden-tide seaweed in the northwestern Pacific coasts including China, Japan and Korea 5,12 as well as the northeastern Pacific coasts 7,13 . More recently, S .…”

Section: Introductionmentioning

confidence: 99%

The origin and population genetic structure of the ‘golden tide’ seaweeds, Sargassum horneri, in Korean waters

Byeon

Kim

et al. 2019

Sci Rep

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In recent years, drifting and inundating brown seaweed ( Sargassum horneri ) biomass, called ‘golden tides’, has frequently drifted and accumulated along the southern coastlines of Korea, causing devastating impacts on the local economy and coastal ecosystems. In this study, based on combined analyses of mitochondrial DNA cox3 gene and seven microsatellites, we investigated the genetic makeup of the floating S . horneri populations ( N = 14) in comparison to Korean benthic populations ( N = 5), and tracked their genetic sources. Given a shared mtDNA haplotype and oceanic circulation systems, the floating populations may have been originated from the southeastern coast of China (e.g. Zhoushan, Zhejiang province). Population structure analyses with microsatellites revealed two distinct genetic clusters, each comprising floating and benthic populations. High levels of inter-population differentiation were detected within Korean benthic samples. The floating populations from the same periods during a 2015–2018 year were genetically more different from one another than those from different periods. These results suggest that the floating populations might be of multiple genetic sources within geographic origin(s). This study will inform management efforts including the development of “ S . horneri blooming forecasting system”, which will assist in mitigating ecological and economic damages on the Korean coastal ecosystems in the future.

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“…Many species of macroalgae are foundation species and autogenic "ecosystem engineers" (sensu Jones et al 1994, Arkema et al 2009, Teagle et al 2017 in that they create essential three-dimensional structure and provide food and refuge for numerous other organisms (Dayton 1972, Schmidt and Scheibling 2007, Wallentinus and Nyberg 2007, Riosmena-Rodr ıguez et al 2012, Gabara et al 2018). Thus, habitat-forming invasive macroalgae have the potential to alter recipient ecosystems if they act as foundation species that provide such services.…”

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confidence: 99%

“…The fucoid alga Sargassum horneri (=S. filicinum) was first reported in Long Beach Harbor, CA, USA in 2003 and has since spread along the coast of California, to the CA Channel Islands, and southward along the Baja California Peninsula to Isla Natividad, BCS, MEX where it forms dense, monospecific stands on low-intertidal and subtidal rocky reefs (Miller et al 2007, Riosmena-Rodr ıguez et al 2012, Marks et al 2015. Subtidal populations can grow so densely that they displace native seaweeds, including Macrocystis pyrifera and numerous understory species, with cascading consequences for fish recruitment (Ginther and Steele 2018), species richness, and gross community production (Sullaway and Edwards 2020).…”

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confidence: 99%

“…While this species has been the subject of several studies in its native range along the coast of Japan and in invaded habitats in northeast China, South Korea, and Taiwan (e.g., Yoshida 1983, Umezaki 1984, Uchida 1993, Nanba 1995, Choi et al 2008, Pang et al 2008, Yoshikawa et al 2014, Kim et al 2016, Lin et al 2017, little is known about its ecology in the invaded regions of the California and Baja California coast. For instance, S. horneri occurs in a broad range of temperatures (1-28°C) in its native habitat (Umezaki 1984, Komatsu et al 2014, but it appears to occur within a much narrower temperature range of about 12 to 20°C in California and Baja California (Cruz-Trejo et al 2009, Miller and Engle 2009, Riosmena-Rodr ıguez et al 2012, Marks et al 2015, which may be critical to regulating its continued northward and southward spread. Further, while some studies have shown high irradiances to be beneficial to S. horneri growth in its native habitat (e.g., Pang et al 2005Pang et al , 2006Pang et al , 2008, little is known about how irradiance impacts S. horneri populations in recipient locations in California and Baja California.…”

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confidence: 99%

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Thermal Tolerance May Slow, But Not Prevent, the Spread of Sargassumhorneri (Phaeophyceae) along the California, USA and Baja California, MEX Coastline

Small

Edwards

2021

Journal of Phycology

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Biological invasions have become increasingly prevalent in marine ecosystems, modifying biodiversity and altering the way ecosystems function. Understanding how variation in environmental factors influences the success of non‐native species, especially their early life stages, can be a crucial step in identifying habitats that are under threat of invasion, and in predicting how rapidly and far these species may spread once they arrive in novel habitats. The invasive marine macroalga Sargassum horneri was first observed in Long Beach Harbor, CA, USA in 2003, and has since spread throughout the Southern California Bight and along the Baja California Peninsula, MEX where it now forms dense stands on subtidal rocky reefs and displaces native habitat‐forming macroalgae. We examined how variation in temperature, nutrients, and irradiance affect survival, growth, and development in S. horneri early life stages over a three‐week period. Our experimental treatments consisted of orthogonally crossed temperatures (10, 15, 20, and 25°C), nutrient concentrations (ambient and nutrient‐enriched seawater), and irradiances (50 and 500 µmol photons · m−2 · s−1). Overall, temperature exerted the greatest influence on S. horneri’s germling and juvenile life stages, with moderate temperatures facilitating their greatest survival, growth, and development. In contrast, fewer germlings developed fully under the lowest or highest temperatures, and juvenile survival and growth were reduced, especially when combined with low irradiances. Together, our data suggest that ocean temperatures of or below 10˚C and of or above 25°C may slow, but likely not stop, S. horneri’s northward and southward expansion along the California and Baja California coasts.

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The invasive seaweed Sargassum filicinum (Fucales, Phaeophyceae) is on the move along the Mexican Pacific coastline

Cited by 16 publications

References 11 publications

Niche Complementarity and Resistance to Grazing Promote the Invasion Success of Sargassum horneri in North America

Niche Complementarity and Resistance to Grazing Promote the Invasion Success of Sargassum horneri in North America

The origin and population genetic structure of the ‘golden tide’ seaweeds, Sargassum horneri, in Korean waters

Thermal Tolerance May Slow, But Not Prevent, the Spread of Sargassumhorneri (Phaeophyceae) along the California, USA and Baja California, MEX Coastline

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