Changes in drag and drag coefficient on small Sargassum horneri (Turner) C. Agardh individuals

Xu, Min; Sasa, Shuji; Otaki, Takayoshi; Hu, Fuxiang; Tokai, Tadashi; Komatsu, Toshimitsu

doi:10.1016/j.aquabot.2017.11.002

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…Oysters, R. venosa and A. japonicus were collected by SCUBA divers scraping them off 0.5 × 0.5 m 2 quadrats. Sampled organisms were counted and weighed to the nearest 0.1 g , Xu et al 2018b). Other func- tional groups were sampled through crab fishing and trawling.…”

Section: Sampling and Ecopath Input Valuesmentioning

confidence: 99%

Ecosystem attributes of trophic models before and after construction of artificial oyster reefs using Ecopath

Xu¹,

Qi²,

Zhang³

et al. 2019

Aquacult. Environ. Interact.

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The deployment of artificial reefs (ARs) is currently an essential component of sea ranching practices in China due to extensive financial support from the government and private organizations. Blue Ocean Ltd. created a 30.65 km 2 AR area covered by oysters in the eastern part of Laizhou Bay, Bohai Sea. It is important for the government and investors to understand and assess the current status of the AR ecosystem compared to the system status before AR deployment. We provide that assessment, including trophic interactions, energy flows, keystone species, ecosystem properties and fishing impacts, through a steady-state trophic flow model (Ecopath with Ecosim). The model estimated values of 4721.2 and 4697.276 t km −2 yr −1 for total system throughput and 534.74 and −519.9 t km −2 yr −1 for net system production before and after AR deployment, respectively. After AR deployment, sea cucumber and oyster showed the same trophic level (TL = 2.0) while veined whelk Rapana venosa had TL = 3.0. The mean TL of catches was 2.484 after AR deployment and the primary production required to support fisheries (PPR) was 1104 t km −2 . Detritus production dominated over primary production and represented 73.82% (2530.82 t km −2 ) of total primary production required. The sea cucumber showed the lowest PPR/catch value (5.6) among functional groups, indicating that fishing catch biomasses were close to primary production values. The total primary production to total respiration and total primary production to total biomass ratios showed higher system maturity after AR deployment. The trophic flow diagram showed 1 grazing and 2 detritus food chains. Pelagic and bottom fish and different benthic organisms, including large crustaceans and zoobenthos, were the dominant community before AR deployment. Zoobenthos was the key functional group, followed by large crustaceans and Gobiidae, which were the most important prey for top predators after AR deployment. We draw the following conclusions for the management of this area: (1) AR deployment contributes to the maturity of the improved ecosystem; (2) the artificial oyster system is similar to a natural reef system; (3) the enhancement and release of benthic animals in the AR area benefit the ecosystem; and (4) low TL catches do not cause the system to collapse.

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Section: Sampling and Ecopath Input Valuesmentioning

confidence: 99%

Ecosystem attributes of trophic models before and after construction of artificial oyster reefs using Ecopath

Xu¹,

Qi²,

Zhang³

et al. 2019

Aquacult. Environ. Interact.

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“…The adult S. horneri thalli contain a large number of gas‐filled vesicles which function as buoyancy aids and allow the algal thalli to stand upright from the bottom (Yoshida ). 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 ).…”

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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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“…Sargassum seaweed beds are important coastal habitats for a variety of marine organisms; in these habitats marine organisms feed, hide, and spawn [ 1 – 6 ]. Among Sargassum species, Sargassum horneri (Turner) C. Agardh is a seaweed species (Class: Phaeophyceae ; Order: Fucales ; Family: Sargassaceae ) with an annual cycle that belongs to the order Fucales [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Sargassum horneri C. Agardh space capacity estimation reveals that thallus surface area varies with wet weight

Sasa

Komatsu

2018

PLoS ONE

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Sargassum horneri C. Agardh is an important commercial edible seaweed species in east Asia. Benthic beds and floating rafts in coastal areas make excellent habitats for marine organisms to feed, hide, and spawn. Many commercially important fish species such as Japanese anchovy (Engraulis japonicus), yellowtail (Seriola quinqueradiata), and Japanese horse mackerel (Trachurus japonicus) live in seaweed beds. Chinese and Japanese fisherman rely on S. horneri beds as productive fish harvest areas. The Zhejiang government in China set a total allowable catch standard, to preserve the Ma’an Islands ecosystem, which is a marine protected area. In this study we analysed the association between weight and one-sided surface area of S. horneri beds, and calculated the ratio of one-sided surface area to change in wet weight over time. We collected samples from December 2014 to May 2015. Approximately 1 g of S. horneri biomass provided ~15 cm2 of one-sided surface area available to marine organisms. These calculations can be used as a reference regarding potential space to improve total allowable catch standard management in S. horneri beds, through the estimation of space capacity of seaweed beds.

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Changes in drag and drag coefficient on small Sargassum horneri (Turner) C. Agardh individuals

Cited by 10 publications

References 18 publications

Ecosystem attributes of trophic models before and after construction of artificial oyster reefs using Ecopath

Ecosystem attributes of trophic models before and after construction of artificial oyster reefs using Ecopath

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

Sargassum horneri C. Agardh space capacity estimation reveals that thallus surface area varies with wet weight

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