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:10.1007/978-1-4020-9619-8_44

Cited by 14 publications

(23 citation statements)

References 20 publications

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“…Furthermore, rafts from the Archipelago Sea are likely to disperse toward the Stockholm Archipelago year round but not vice versa. Overall, our model shows that floating Fucus can be transported far away from their source areas, such as reported previously for floating algae from Japan (Komatsu et al ) or Chile (Hinojosa et al ; Rothäusler et al ) among others.…”

Section: Discussionsupporting

confidence: 86%

mentioning

confidence: 99%

“…The temporal supply of floating algae can be variable, and is often related to the growth and reproductive season of their benthic form (Komatsu et al , 2014; Hinojosa et al ; Thiel et al ). For instance, floating individuals of many fucoids are observed during summer when algae shed most of their reproductive thalli during their main growth season (Komatsu et al ; Hinojosa et al ; Thiel et al ). Furthermore, it is known that certain oceanographic and meteorological features such as frequent storms, or fronts and eddies can also play a role in the temporal dynamics of floating algae at the sea surface (Kingsford ; Thiel and Gutow ), which in turn may cause their trajectories and potential connectivity to vary over time (Watson et al ).…”

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confidence: 99%

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Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Rothäusler

Corell

Jormalainen

2015

Limnology & Oceanography

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Floating macroalgae play a fundamental role for the connectivity of littoral marine habitats. They can be found throughout the world's oceans but information on their abundance and dispersal abilities is scarce. This information, however, is essential to evaluate their ecological role and the potential connectivity between populations of both the algae and associated biota. Here, we survey the abundance and spatiotemporal dispersal patterns of the floating brown alga Fucus vesiculosus in the Northern Baltic Sea. By incorporating a biophysical modeling approach, based on ocean circulation and surface winds, we demonstrate potential dispersal ranges, such as floating distances and directional trajectories of F. vesiculosus at different times of their reproductive season. Abundance of floating algae varied both spatially and temporally, with the highest densities being found during reproductive seasons. Evidenced by the fact that many algae were held back and accumulated in archipelagoes, the model suggests that a combination of local oceanographic features and seascapes strongly influences the dispersal of floating algae. However, a relatively high fraction of rafts spilled to more open sea areas, causing them to travel in multiple directions (e.g., Baltic Proper, Bothnian Bay, and Gulf of Finland) that are hundreds of kilometers away from their original sources, implying long-distance dispersal. We propose that the Northern Baltic Sea rocky littoral habitats are potentially well connected through abundant and long-reaching floating algae, with a chance to contribute to gene flow among F. vesiculosus populations.

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Section: Discussionsupporting

confidence: 86%

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confidence: 99%

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confidence: 99%

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Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Rothäusler

Corell

Jormalainen

2015

Limnology & Oceanography

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“…Algal thalli can become detached from the bottom by the sheer drag force of waves and currents, and their positive buoyancy provided by the gas‐filled vesicles allow them to float to the water surface (Xu et al ). The floating biomass can maintain its vegetative state in the intertidal and subtidal zones, and some biomass may even reach offshore waters via surface currents (Komatsu et al ). In addition, research has shown S. horneri to expand its distribution from the coasts of East Asia to the American coasts, spreading along the coasts of southern California and down into Baja California, Mexico.…”

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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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“…A geographic information system (GIS) is a viable solution and is defined as the ‘integration of computer hardware and software with spatially referenced digital data so that storage, retrieval, manipulation, analysis, and presentation of the data is possible in order to produce new spatially related output’ 18 . A brief literature review demonstrates that GIS has been used for very different purposes such as identifying the most productive zones for fisheries, 19 selecting artificial reef sites 20,21 or suitable conservation sites, 22,23 sea grass mapping, 24–27 sea weed mapping, 28,29 drifting sea weed distribution, 30,31 managing coastal natural resources in a sustainable way, 32–34 assessing pollution risk 35 or environmental impact, 36,37 explaining current dynamics, 38 evaluating the extent of a closure area 39 and even evaluating the costs and benefits of a planned policy 40,41 …”

Section: Introductionmentioning

confidence: 99%

Assessing bottom structure influence on fish abundance in a marine hill by using conjointly acoustic survey and geographic information system

et al. 2008

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Acoustic survey and a geographic information system (GIS) were used conjointly to estimate the significance of bottom substrate to explain fish abundance distribution in the complex topography context of a marine hill. The survey was conducted in the Hachirigase hill, off southwestern Honshu Island in the Sea of Japan. Analysis of acoustic data focused on a 10-m thick layer beginning at the bottom, assuming that bottom influence does not exceed this distance. Area backscattering strength (Sa) values were rescaled in order to reflect real differences before being analyzed. Results show that the influence of the different parameters taken into account (bottom depth, bottom substrate and water temperature) varies widely from one place to another. Bottom substrate is above all important in the zone located to the west of the peak. The kriging and stratification methods were applied to the Sa distribution for estimating the total Sa in the hill. Differences between results are discussed. Conjoint use of acoustic survey and GIS is an effective method for analyzing and estimating fish abundance distribution in a marine hill.KEY WORDS: acoustic survey, bottom structure influence, fish abundance distribution, GIS, marine hill.

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Abundance of drifting seaweeds in eastern East China Sea

Cited by 14 publications

References 20 publications

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

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

Assessing bottom structure influence on fish abundance in a marine hill by using conjointly acoustic survey and geographic information system

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