Geomorphology and sediment dynamics of the Liyashan oyster reefs, Jiangsu Coast, China

Lin, Hai; Yu, Qian; Du, Zhiyun; Yang, Fan; Wang, Yunwei; Gao, Shu

doi:10.1007/s13131-021-1866-3

Cited by 7 publications

(3 citation statements)

References 64 publications

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“…This oyster was a native estuarine species widely distributed in southern China (Qin et al, 2021), with a northern distribution limit in Liyashan oyster reef, Nantong, Jiangsu province (32°08′ N) until 2006 (Wang et al, 2013). The oyster reef has had more than 1000 years of evolutionary history (Lin et al, 2021), and performs important functions in coastal protection and biological resource conservation. Previous phylogeographical studies based on mitochondrial COI and nuclear ITS data have identified unique haplotypes in the Liyashan population, south Korean population, and Japanese populations of the oyster (Hu, Liu, et al, 2018; Sekino et al, 2012), implying genetic differentiation among different geographical populations.…”

Section: Introductionmentioning

confidence: 99%

Multiple genetic sources facilitate the northward range expansion of an intertidal oyster along China's coast

Dong

2022

Ecological Applications

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Coastal artificial structures on the former mudflats provide available habitats for the rocky intertidal species which can establish new populations in these emerging habitats over their former distribution range limits. As a former southern species, the oyster Crassostrea sikamea has become a pioneer and rapidly invaded the artificial shorelines in northern China. We used a seascape genomics approach to investigate the population structure and genetic sources of C. sikamea on the coastal artificial structures, which is crucial for understanding the genetic mechanisms driving species distribution range expansion and invasion pathway of intertidal species. Five C. sikamea populations, including two artificial substrate populations (WGZ and ZAP), one oyster reef population (LS), and two natural rocky shore populations (ZS and XM), were measured using single nucleotide polymorphism (SNPs) obtained from double digest restriction‐site associated DNA sequencing (ddRAD‐Seq). Redundancy analyses (RDA) were implemented for investigating the relationship between local temperature variables and the temperature adaptability of C. sikamea. Genetic diversity, direction and strength of gene flow, and population structure all revealed that the LS and ZS populations were the genetic sources for the oyster populations on the emerging northern coastal artificial structures. Results of RDA showed that there were different adaptive potentials for northern and southern populations to local temperature variables and the oyster reef population which frequently suffers from heat stress owned high heat adaptability. The ZS population as a genetic source nearby the Yangtze River estuary provided mass larvae for the northern populations, and the other genetic source, the heat‐tolerant LS population, in the oyster reef played an important role in the post‐settlement success by providing preadapted genotypes. These results highlight the importance of multiple sources with divergent adaptative capabilities for biological invasion, and also emphasize the importance of the oyster reef in coastal biodiversity and conservation.

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Section: Introductionmentioning

confidence: 99%

Multiple genetic sources facilitate the northward range expansion of an intertidal oyster along China's coast

Dong

2022

Ecological Applications

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“…The Xiaomiaohong Channel is located on the southern flank of the submarine radial sand ridges southwest of the Yellow Sea. The study area is characterized by irregular semidiurnal tides and a large tidal range, with neap tides reaching 2.5 m and spring tides reaching 6 m (Lin et al, 2021). Shielded by the wide Yaosha Shoal extending from east to west, the waves of the Xiaomiaohong Channel are small, and the multi-year average wave height is only 0.3 m (Zhang, 2004).…”

Section: Study Areamentioning

confidence: 99%

“…The spatial structure of oyster reefs can be severely damaged by dredging, which leads to a drastic reduction in oyster production and oyster reef area (Rothschild et al, 1994). Simultaneously, sediment resuspension caused by dredging projects inundates oyster beds, generating high sediment loads and directly causing decline in oyster populations (Volety et al, 2009;Wilber and Clarke, 2010;Lin et al, 2021). All these human activities have a direct or indirect effect on the development of oyster reefs.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and sediment dynamic impact of human engineering activity on Liyashan oyster reefs, China

Luo

Chen²,

Wu³

et al. 2022

Front. Mar. Sci.

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As human activity increases, coastal ecosystems are becoming increasingly vulnerable to a range of challenges. Oyster reefs are coastal ecosystems that provide habitats for a diverse range of marine species while also purifying water and providing natural coastal defense. However, because of human activity, global oyster reef areas have drastically diminished and are in grave danger. Simultaneously, it is impossible to determine the negative impact of human engineering activity on oyster reefs, due to the lack of intuitive and quantitative study methodologies. To address this issue, we applied a hydrodynamic model to analyze the impact on oyster reefs. First, we considered that human engineering activity, that is, coastal engineering, mainly affects the development of Liyashan Oyster Reefs by influencing hydrodynamics, sediment concentration, and bed-level evolution. We then applied MIKE3 to establish and validate a 3D hydrodynamic model of the southern part of the Yellow Sea around oyster reefs. Results showed that regional variations in flow velocity and suspended sediment concentration occurred in oyster reef waters, but the magnitude of these variations was limited. However, seabed elevation increased substantially in the Center Protection Area, which had a negative impact on oyster reefs. In general, our study provided a paradigm for analyzing the degree of impact on oyster reefs, showed the advantages of hydrodynamic models in quantitatively analyzing impact factors, and had reliable results.

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Scientific basis, engineering feasibility and system optimization of green sea dykes for temperate mud coasts: a brief overview

Yu,

Jia,

Gao

2024

Anthropocene Coasts

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Green sea dykes, also known as ecosystem-based sea dykes, represent a novel type of coastal defense consisting of both traditional structural engineering and coastal ecosystems, designed to cope with the future trends of sea level rise and intensified storms. Here we focus on the mid-latitude mud coasts (eastern China in particular), which face the most prominent risks of storm surge, storm-induced giant waves, and shoreline erosion, and summarizes the scientific basis of green sea dykes and the current status of engineering practices. We show that the basic mechanisms of nearshore wave energy dissipation include bottom friction, sediment transport, and form drag. These explain the wave damping capacity of oyster reefs and salt marshes on mud coasts. In tidal flat environments, oyster growth increases frictional resistance and even causes wave breaking; the resuspension and transport of fine-grained sediments on salt marsh beds and the movement or resistance to hydrodynamic forcing of salt marsh vegetation stems effectively dissipate wave kinetic energy, and their efficiency increases with the elevation of the bed surface. Based on the wave damping capacity of oyster reefs and salt marshes on mud coasts, ecosystem-based sea dykes are being built in combination with traditional structured sea dykes. By utilizing natural tidal flats outside the dykes or implementing artificial modification projects, a certain scale of salt marshes and/or oyster reefs can be maintained, which serve to protect the sea dykes and enhance their wave resistance functions. From the perspective of system optimization, it is necessary to further improve the efficiency and sustainability of green sea dykes under constraints such as regional environment characteristics, ecosystem health, investment capacity, and ecological resilience. Related scientific issues include the theorization of the wave damping process of salt marshes, the niche and scale control of oyster reef and salt marsh ecosystems, the establishment of engineering standards and the design of the optimal form of sea dykes.

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Geomorphology and sediment dynamics of the Liyashan oyster reefs, Jiangsu Coast, China

Cited by 7 publications

References 64 publications

Multiple genetic sources facilitate the northward range expansion of an intertidal oyster along China's coast

Multiple genetic sources facilitate the northward range expansion of an intertidal oyster along China's coast

Hydrodynamic and sediment dynamic impact of human engineering activity on Liyashan oyster reefs, China

Scientific basis, engineering feasibility and system optimization of green sea dykes for temperate mud coasts: a brief overview

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