<i>Ulva prolifera</i> green-tide outbreaks and their environmental impact in the Yellow Sea, China

Zhang, Yongyu; He, Peimin; Li, Hongmei; Li, Gang; Liu, Jihua; Jiao, Fanglue; Zhang, Jianheng; Huo, Yuanzi; Shi, Xiaoyong; Su, Rongguo; Ye, Naihao; Chen, Lingxin; Yu, Rencheng; Wang, Zongling; Zhou, Mingjiang; Jiao, Nianzhi

doi:10.1093/nsr/nwz026

Cited by 182 publications

(96 citation statements)

References 91 publications

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“…Porphyra) yezoensis farms in the Yellow Sea (Fan et al 2015;Song et al 2018). The decomposition of green tides can result in hypoxia and acidification, induce red tides and have long lasting effects on the coastal carbon cycle and ecosystem health (reviewed in Zhang et al 2019).…”

Section: Interference With Seaweed Culture Infrastructurementioning

confidence: 99%

Biofouling in marine aquaculture: a review of recent research and developments

et al. 2019

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Biofouling in marine aquaculture is one of the main barriers to efficient and sustainable production. Owing to the growth of aquaculture globally, it is pertinent to update previous reviews to inform management and guide future research. Here, the authors highlight recent research and developments on the impacts, prevention and control of biofouling in shellfish, finfish and seaweed aquaculture, and the significant gaps that still exist in aquaculturalists' capacity to manage it. Antifouling methods are being explored and developed; these are centred on harnessing naturally occurring antifouling properties, culturing fouling-resistant genotypes, and improving farming strategies by adopting more sensitive and informative monitoring and modelling capabilities together with novel cleaning equipment. While no simple, quick-fix solutions to biofouling management in existing aquaculture industry situations have been developed, the expectation is that effective methods are likely to evolve as aquaculture develops into emerging culture scenarios, which will undoubtedly influence the path for future solutions. ARTICLE HISTORY

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Section: Interference With Seaweed Culture Infrastructurementioning

confidence: 99%

Biofouling in marine aquaculture: a review of recent research and developments

et al. 2019

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“…Bloom‐forming species in the intertidal zone are poised to exploit changes in environmental conditions through rapid regulation of production. Macroalgal blooms in the intertidal zone have disproportionately large ecosystem effects because of the intensity of primary production per unit area in the biotically diverse land–sea interface (Aires et al 2019; Barnes 2019; Zhang et al 2019). The shifting ratios of resources, warming, and more acidified oceans may change the species composition of coastal ecosystems to favor noncalcifying phototrophs and animals over calcifying species (Wootton et al 2008; Koch et al 2013) and weedy species over long lived ones.…”

Section: Uptake Of Dic In Ulva Sppmentioning

confidence: 99%

A multistressor model of carbon acquisition regulation for macroalgae in a changing climate

Dudgeon

Kübler

2020

Limnology & Oceanography

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It is widely hypothesized that noncalcifying macroalgae will be more productive and abundant in increasingly warm and acidified oceans. Macroalgae vary greatly in the magnitudes and interactions of responses of photosynthesis and growth to multiple stressors associated with climate change. A knowledge gap that exists between the qualitative "macroalgae will benefit" hypothesis and the variable outcomes observed is regulation of physiological mechanisms that cause variation in the magnitudes of change in primary productivity, growth, and their covariation. In this context, we developed a model to quantitatively describe physiological responses to coincident variation in temperature, carbonate chemistry and light supply in a representative bicarbonate-using marine macroalga. The model is based on Ulva spp., the best understood dissolved inorganic carbon uptake mechanism among macroalgae, with data enabling synthesis across all parameters. At boundary layer pH < 8.7 most inorganic carbon is taken up through the external carbonic anhydrase (CA ext) mechanism under all conditions of photosynthetic photon flux density, temperature, and boundary layer thickness. Each 0.1 unit decline in pH causes a 20% increase in the fraction of diffusive uptake of CO 2 thereby lessening reliance on active transport of bicarbonate. Modeled downregulation of anion exchange-mediated active bicarbonate transport associated with a 0.4 unit decline in pH under ocean acidification is consistent with enhanced growth up to 4% per day without increasing photosynthetic rate. The model provides a means to quantify magnitudes of change in productivity under factorial combinations of changing temperature, pCO 2 , and light supply anticipated as climate changes.

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“…For example, the 2008 Yellow Sea shade green tide outbreak induced by marine raft aquaculture had a negative impact on the Olympic sailing event and led to the loss of RMB 1.3 billion. This serious environmental catastrophe stemmed largely from the environmental pressure environmental pressure caused by the increasing number of marine raft aquaculture areas [2]. The distribution and number of marine raft aquaculture areas reflect the development status of the fishery as well as the quality of the water environment.…”

Section: Introductionmentioning

confidence: 99%

Combining Segmentation Network and Nonsubsampled Contourlet Transform for Automatic Marine Raft Aquaculture Area Extraction from Sentinel-1 Images

et al. 2020

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Marine raft aquaculture (MFA) plays an important role in the marine economy and ecosystem. With the characteristics of covering a large area and being sparsely distributed in sea area, MFA monitoring suffers from the low efficiency of field survey and poor data of optical satellite imagery. Synthetic aperture radar (SAR) satellite imagery is currently considered to be an effective data source, while the state-of-the-art methods require manual parameter tuning under the guidance of professional experience. To preclude the limitation, this paper proposes a segmentation network combined with nonsubsampled contourlet transform (NSCT) to extract MFA areas using Sentinel-1 images. The proposed method is highlighted by several improvements based on the feature analysis of MFA. First, the NSCT was applied to enhance the contour and orientation features. Second, multiscale and asymmetric convolutions were introduced to fit the multisize and strip-like features more effectively. Third, both channel and spatial attention modules were adopted in the network architecture to overcome the problems of boundary fuzziness and area incompleteness. Experiments showed that the method can effectively extract marine raft culture areas. Although further research is needed to overcome the problem of interference caused by excessive waves, this paper provides a promising approach for periodical monitoring MFA in a large area with high efficiency and acceptable accuracy.

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Ulva prolifera green-tide outbreaks and their environmental impact in the Yellow Sea, China

Cited by 182 publications

References 91 publications

Biofouling in marine aquaculture: a review of recent research and developments

Biofouling in marine aquaculture: a review of recent research and developments

A multistressor model of carbon acquisition regulation for macroalgae in a changing climate

Combining Segmentation Network and Nonsubsampled Contourlet Transform for Automatic Marine Raft Aquaculture Area Extraction from Sentinel-1 Images

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