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

Xu, Min; Sasa, Shuji; Komatsu, Toshimitsu

doi:10.1371/journal.pone.0199103

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…China's Bohai Sea ecosystem, one of the most intensively exploited areas in the world (Wigan 1998), is heavily degraded due to overfishing, pollution from inland areas and loss of biological habitat. Open-access and unregulated fisheries contribute to this deteriorating tendency and many small-scale fishermen still make a living through illegal fishing and use of destructive fishing gear in this region (Zhang et al 2012, 2018a. In 2011, Blue Ocean Ltd. created a 30.65 km 2 AR area in the eastern part of Laizhou Bay in the Bohai Sea (see Fig.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Floating at the sea surface, seagrass wracks can serve as habitat “hot spots” similar to other floating vegetation such as floating macroalgae (e.g. Sargassum horneri in the East China Sea)[ 12 – 14 ]. Thresher [ 15 ] is one of the only studies to report on the trophic impacts of floating seagrass wracks.…”

Section: Introductionmentioning

confidence: 99%

The distribution of large floating seagrass (Zostera marina) aggregations in northern temperate zones of Bohai Bay in the Bohai Sea, China

Zhou

Song

et al. 2019

PLoS ONE

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Seagrass meadows (Zostera marina) are important coastal ecosystems with high levels of productivity and biodiversity. They often have high biomass turnover and are susceptible to dislodgment, leading to export of biomass from seagrass beds. In September 2016, two cruises covering a total area of 52 km x 15 km (38°57'1.14"–39° 0'41.28" N, 118°45'23.22"–118°47'6.96" E) found floating Z. marina aggregations along 13 km of the transect in the northernmost area of Bohai Bay, in the Bohai Sea, China. This floating seagrass was 6.3–13.4 km northeast (offshore) of the Caofeidian seagrass bed, which is a large (10 km2) seagrass bed discovered in 2015 in the Bohai Sea, China. The modal length of floating intact shoots (from meristem to longest leaf tip) matched samples from the Caofeidian seagrass bed. The dominant individuals lengths were 40–50 cm, with less than 5% of the total number of individuals found in larger size categories (80–90 and 90–100 cm). We concluded that they originated from the nearby Caofeidian seagrass meadows.

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“…In addition, heavy metal pollution is mainly caused by anthropogenic activities, including burning garbage, industrial waste, overuse of chemical fertilizer and pesti-butes on rocks from lower intertidal to subtidal zones along the coastline of the northern Pacific (Komatsu et al 2014, Xu et al 2018 (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Low pH in simulated acid rain promotes the toxicity of copper on the physiological performance in Sargassum horneri

Zhong¹,

Qin²,

Wang³

et al. 2020

Photosynt.

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In order to investigate the interactive effects of simulated acid rain and copper (Cu) on macroalgae, Sargassum horneri was cultured under pH of 8.2, 5.6, 4.5 and Cu concentrations of 0, 25, 100 μg L-1. Under the medium concentration of Cu, moderate pH mitigated the toxicity of Cu on S. horneri, while the low pH and high Cu concentration reduced the contents of chlorophyll (Chl) a and carotenoids. Furthermore, pH had no interaction with Cu on maximal Chl fluorescence or electron transport efficiency, while effective PSII quantum yield, maximum electron transport rate, and saturating irradiance were obviously affected by pH and Cu, and the interactive effects were significant. Additionally, with the increasing Cu concentration and decreasing pH, nonphotochemical quenching and regulated energy dissipation dropped sharply, while nonregulated energy dissipation increased. Therefore, the high concentration of Cu and low pH had synergistic effects on the photosynthetic performance and growth of S. horneri.

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

Cited by 10 publications

References 21 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

The distribution of large floating seagrass (Zostera marina) aggregations in northern temperate zones of Bohai Bay in the Bohai Sea, China

Low pH in simulated acid rain promotes the toxicity of copper on the physiological performance in Sargassum horneri

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