Abundance of drifting seaweeds in eastern East China Sea

Komatsu, Toshimitsu; Matsunaga, Daisuke; Mikami, Akiko; Sagawa, T.; Boisnier, Etienne; Tatsukawa, Kenichi; Aoki, Masakazu; Ajisaka, Tetsuro; Uwai, Shinya; Tanaka, Katsuhiko; Ishida, Kunio; Tanoue, Hideaki; Sugimoto, Takashige

doi:10.1007/s10811-007-9302-4

Cited by 60 publications

(23 citation statements)

References 22 publications

(26 reference statements)

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“…Sargassum horneri is an important perennial, canopy-forming seaweed native to the northwestern Pacific coast growing in the upper sublittoral zone (Hu et al 2011). During the past several years, its largescale biomass has been continuously observed drifting in the Yellow Sea and the East China Sea (Komatsu et al 2008). In its native distribution areas, e.g., the coastal water of Zhejiang Province of China, its biomass has been observed to decrease steadily and even disappear in certain regions (Sun et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Chloroplast genome of Sargassum horneri (Sargassaceae, Phaeophyceae): comparative chloroplast genomics of brown algae

Liu

Pang

2015

J Appl Phycol

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Sargassum horneri (Turner) C. Agardh is an important canopy-forming seaweed native to the northwestern Pacific coast growing in the upper sublittoral zone. In this study, the chloroplast genome of S. horneri was fully sequenced and compared with three other brown algal chloroplast genomes. The S. horneri chloroplast genome is 124,068 bp in size with an inverted repeat of 5436 bp and is slightly smaller than the other three brown algal chloroplast DNAs (cpDNAs). It contains 173 genes, including 6 ribosomal RNA (rRNA) genes, 28 transfer RNA (tRNA) genes, and 139 protein-coding genes (PCGs). The coding sequence constitutes 86.32 % of the S. horneri cpDNA. The total spacer size was found to be reduced to 16,967 bp with an average length of 101.0 bp, which makes the S. horneri cpDNA more compact than the other three brown algal cpDNAs. Sixteen small inverted and nine tandem repeats were detected in S. horneri chloroplast genomes. Two introns in trnL2 and trnW genes were identified with the size of 209 and 90 bp, respectively. Its gene content and order are identical to those of Fucus vesiculosus cpDNA, indicating that the chloroplast genome organization at the level of the order Fucales is highly conserved.

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Section: Introductionmentioning

confidence: 99%

Chloroplast genome of Sargassum horneri (Sargassaceae, Phaeophyceae): comparative chloroplast genomics of brown algae

Liu

Pang

2015

J Appl Phycol

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“…The alga is one of the principal members of the intertidal seaweed flora and plays important roles in providing an environment for a distinctive and specialized group of marine animals and plants, many of which are not found elsewhere (Nanba 1995;Choi et al 2003). This large seaweed forms extensive floating biomass in both the intertidal and subtidal waters, as well as large-scale drifting biomass in surface waters (Komatsu et al 2008). S. horneri has become one of the main algal species chosen to reconstruct seaweed beds in Korea and Japan (Yamauchi 1984;Choi et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In the meantime, Komatsu et al (2008) reported the occurrence of large amounts of drifting biomass in the eastern area of the Eastern China Sea that was exclusively composed of S. horneri. Based on successive years of observation and calculation, the authors suspected that this drifting biomass came from the Zhejiang Islands of China.…”

Section: Introductionmentioning

confidence: 99%

“…The disappearance of sessile populations along the near-shore coast in combination with the occurrence of the drifting biomass in the Eastern China Sea match each other and confirm the fact that the sessile populations of S. horneri have been steadily disappearing from the coasts of Zhejiang Province. The suspected reasons include the destruction of the coastal water environment due to rapid economic development and elevated levels of industrial pollution (Komatsu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Cultivation of the brown alga Sargassum horneri: sexual reproduction and seedling production in tank culture under reduced solar irradiance in ambient temperature

et al. 2008

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As a large conspicuous intertidal brown alga, individuals of Sargassum horneri can reach a length of more than 7 m with a fresh weight of 3 kg along the coasts of the Eastern China Sea. The biomass of this alga as a vital component in coastal water ecology has been well documented. In recent years, a steady disappearance of the algal biomass along the once densely populated coastal areas of the Eastern China Sea has drawn attention in China. Efforts have been made to reconstruct the subtidal algal flora or even to grow the alga by use of long-lines. As part of the efforts to establish an efficient technique for producing seedlings of S. horneri, in this investigation a series of culture experiments were carried out in indoor raceway and rectangular tanks under reduced solar irradiance at ambient temperature in 2007-2008. The investigation demonstrated that: (1) sexual reproduction of S. horneri could be accelerated in elevated temperature and light climates, at least 3 months earlier than in the wild; (2) eggs of S. horneri had the potential to be fertilized up to 48 h, much longer than that of known related species; (3) suspension and fixed culture methods were both effective in growing the seedlings to the long-line cultivation stage; and (4) the life cycle of S. horneri in culture could be shortened to 4.5 months, thus establishing this alga as an appropriate model for investigating sexual reproduction in dieocious species of this genus.

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“…In addition, seaweeds, due to their high rates of production, fragmentation, and ability to be transported, would also appear to be able to make a significant contribution as carbon donors to blue carbon habitats (Hill et al 2015;Trevathan-Tacket et al 2015). Carbon in the coastal ecosystems can be transported or donated to other ecosystems in the form of particulate organic carbon (POC), dissolved organic carbon (DOC), and dissolved inorganic carbon (DIC) (Hill et al 2015), drifting seaweeds (Komatsu et al 2008;Ito et al 2009), and dislodgement of seaweed thalli (Hobday 2000;McKenzie and Bellgrove 2009). Transport of DOC and POC from coastal vegetated intertidal habitats such as mangrove, seagrass, and seaweed can also occur via dissolved or particular matter, through migration of animals from intertidal to subtidal areas, and through a series of predator-prey interactions (trophic relay) (Kneib 1997;Bouillon and Connolly 2009).…”

Section: Seaweeds and Sabs Capabilities In Co 2 Sequestrationmentioning

confidence: 99%

Carbon dioxide mitigation potential of seaweed aquaculture beds (SABs)

et al. 2016

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Seaweed aquaculture beds (SABs) that support the production of seaweed and their diverse products, cover extensive coastal areas, especially in the Asian-Pacific region, and provide many ecosystem services such as nutrient removal and CO 2 assimilation. The use of SABs in potential carbon dioxide (CO 2 ) mitigation efforts has been proposed with commercial seaweed production in China, India, Indonesia, Japan, Malaysia, Philippines, Republic of Korea, Thailand, and Vietnam, and is at a nascent stage in Australia and New Zealand. We attempted to consider the total annual potential of SABs to drawdown and fix anthropogenic CO 2 . In the last decade, seaweed production has increased tremendously in the Asian-Pacific region. In 2014, the total annual production of Asian-Pacific SABs surpassed 2.61 × 10 6 t dw. Total carbon accumulated annually was more than 0.78 × 10 6 t y −1 , equivalent to over 2.87 × 10 6 t CO 2 y −1 . By increasing the area available for SABs, biomass production, carbon accumulation, and CO 2 drawdown can be enhanced. The conversion of biomass to biofuel can reduce the use of fossil fuels and provide additional mitigation of CO 2 emissions. Contributions

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Abundance of drifting seaweeds in eastern East China Sea

Cited by 60 publications

References 22 publications

Chloroplast genome of Sargassum horneri (Sargassaceae, Phaeophyceae): comparative chloroplast genomics of brown algae

Chloroplast genome of Sargassum horneri (Sargassaceae, Phaeophyceae): comparative chloroplast genomics of brown algae

Cultivation of the brown alga Sargassum horneri: sexual reproduction and seedling production in tank culture under reduced solar irradiance in ambient temperature

Carbon dioxide mitigation potential of seaweed aquaculture beds (SABs)

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