LOW GENETIC VARIABILITY OF <i>SARGASSUM MUTICUM</i> (PHAEOPHYCEAE) REVEALED BY A GLOBAL ANALYSIS OF NATIVE AND INTRODUCED POPULATIONS<sup>1</sup>

Cheang, Chi Chiu; Chu, Ka Hou; Fujita, Daisuke; Yoshida, Goro; Hiraoka, Masanori; Critchley, Alan T.; Choi, Han Ho; Duan, Delin; Serisawa, Yukihiko; Ang, Put O.

doi:10.1111/j.1529-8817.2010.00901.x

Cited by 38 publications

(23 citation statements)

References 86 publications

(168 reference statements)

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“…Among the three molecular markers used, Rub spacer showed lowest genetic variability that is comparable to that in other studies on Sargassum [2,36,39]. This showed that Rub spacer has low mutation rate and may not be suitable for phylogeographical studies of Sargassum .…”

Section: Discussionmentioning

confidence: 53%

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

et al. 2013

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Southeast Asia has been known as one of the biodiversity hotspots in the world. Repeated glacial cycles during Pleistocene were believed to cause isolation of marine taxa in refugia, resulting in diversification among lineages. Recently, ocean current was also found to be another factor affecting gene flow by restricting larval dispersal in animals. Macroalgae are unique in having mode of reproduction that differs from that of animals. Our study on the phylogeographical pattern of the brown macroalga Sargassum polycystum using nuclear Internal Transcribed Spacer 2 (ITS2), plastidal RuBisCO spacer (Rub spacer) and mitochondrial cytochrome oxidase subunit-III (Cox3) as molecular markers revealed genetic homogeneity across 27 sites in Southeast Asia and western Pacific, in sharp contrast to that revealed from most animal studies. Our data suggested that S. polycystum persisted in single refugium during Pleistocene in a panmixia pattern. Expansion occurred more recently after the Last Glacial Maximum and recolonization of the newly flooded Sunda Shelf could have involved asexual propagation of the species. High dispersal ability through floating fronds carrying developing germlings may also contribute to the low genetic diversity of the species.

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Section: Discussionmentioning

confidence: 53%

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

et al. 2013

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“…For example, Sargassum muticum is introduced to British Columbia, Canada, but is found in a wide range of habitats, including pristine areas (Cheang et al. ). With regards to Criterion 2, test area genetic diversity “pools” were compared with global genetic diversity “pools” where possible.…”

Section: Discussionmentioning

confidence: 99%

A Molecular Survey of Ulva (Chlorophyta) in Temperate Australia Reveals Enhanced Levels of Cosmopolitanism

Kirkendale

Saunders

Winberg

2012

Journal of Phycology

103

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The green algal genus Ulva includes a speciose group of marine macroalgae inhabiting shallow seas worldwide. Although algal blooms in Asia highlight the opportunistic nature of several "nuisance" species, recent research clearly reveals important positive benefits of Ulva. Applied research requires accurate, reliable, and rapid identification, however, identification of Ulva spp. has met with con-siderable difficulty. Consequently, many have turned to molecular markers to aid in taxonomy. Previous studies of plants and algae have relied heavily on ITS and rbcL. Recently, tufA has been presented as a suitable barcoding gene to facilitate species-level identification of green macroalgae and it is used here to explore the diversity of Ulva spp. in temperate Australia. Ninety Ulva specimens collected from 38 sites across five states were sequenced for this gene region with exemplars from each genetic group also sequenced for rbcL to test for congruence. Collections of Australian Ulva spp. were compared to samples from Asia and North America and exhibited trends consistent with recent studies in terms of species relationships. Results support an overwhelmingly cosmopolitan flora in temperate Australia that contrasts with other Australasian surveys of Ulva that report a greater number of endemics and new species. Four new records, as well as numerous range extensions for taxa already known from the country, are documented. Evidence for three nonindigenous Ulva species in temperate Australia is discussed.

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“…It is thought to have been transported to Europe through the importation of the Japanese oyster Crassostrea gigas (Farnham et al 1973), with a recent study suggesting that the stock originated from Korea (Bae et al 2013). It now ranges from Norway to Portugal and the Mediterranean (Engelen et al 2008;Cheang et al 2010).…”

Section: Introductionmentioning

confidence: 96%

Environmental factors on egg liberation and germling production of Sargassum muticum

Kerrison

2015

J Appl Phycol

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Sargassum muticum is a successful invasive Phaeophyte macroalga, which has colonized from Norway to the Mediterranean in Europe and from Alaska to the Bay of Mexico on the American Atlantic coast. It is also being evaluated as a commercial crop within its native range, SE Asia. Understanding its reproductive tolerance will improve our understanding of its invasive potential and allow optimal germling production for commercial cultivation. Egg liberation, fertilization and germling production were monitored in fertile branchlets collected from Great Cumbrae, Scotland, UK. These were incubated under a range of conditions as follows: photon flux densities (20-150 μmol photons m −2 s −1 ), salinity (0-70 psu), temperature (10-30°C) and desiccation in either the sun (5-60 min) or the shade (15-120 min). The optimum conditions to maximize germling production were found to be a 15-30 min desiccation period in the shade, followed by immersion into normal salinity seawater at 20°C and 50-100 μmol photons m −2 s −1 . This information could be useful for the development of a cultivation industry within its native range. An interactive effect was seen between temperature and light intensity with germling production favoured in high light and low temperature (10-15°C, 100-150 μmol photons m −2 s −1 ) and vice versa (25-30°C, 20-50 μmol photons m −2 s −1 ). Whilst its salinity and desiccation tolerance agree with previous investigations 40 years ago, the lower temperature optimum of 20°C (previously 25°C) may indicate selection for lower temperature reproduction within the UK population. This may accelerate its invasion northward into Scotland.

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LOW GENETIC VARIABILITY OF SARGASSUM MUTICUM (PHAEOPHYCEAE) REVEALED BY A GLOBAL ANALYSIS OF NATIVE AND INTRODUCED POPULATIONS¹

Cited by 38 publications

References 86 publications

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

A Molecular Survey of Ulva (Chlorophyta) in Temperate Australia Reveals Enhanced Levels of Cosmopolitanism

Environmental factors on egg liberation and germling production of Sargassum muticum

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LOW GENETIC VARIABILITY OF SARGASSUM MUTICUM (PHAEOPHYCEAE) REVEALED BY A GLOBAL ANALYSIS OF NATIVE AND INTRODUCED POPULATIONS1

Cited by 38 publications

References 86 publications

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

Homogeneous Population of the Brown Alga Sargassum polycystum in Southeast Asia: Possible Role of Recent Expansion and Asexual Propagation

A Molecular Survey of Ulva (Chlorophyta) in Temperate Australia Reveals Enhanced Levels of Cosmopolitanism

Environmental factors on egg liberation and germling production of Sargassum muticum

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LOW GENETIC VARIABILITY OF SARGASSUM MUTICUM (PHAEOPHYCEAE) REVEALED BY A GLOBAL ANALYSIS OF NATIVE AND INTRODUCED POPULATIONS¹