Response to Environmental Factors of Spawning Ground in the Pearl River Estuary, China

Wang, Dongliang; Yao, Lijun; Yu, Jingjie; Chen, Pimao; Hu, Ruirui

doi:10.3390/jmse9070763

Cited by 8 publications

(4 citation statements)

References 53 publications

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“…Investigations conducted in the lower PRE have shown that sea surface salinity is one of the crucial factors in explaining the variation in fish egg density in spawning grounds [62]. Hence, the findings of this study may hold valuable reference significance for analyzing and predicting the invasion of invasive fish species.…”

Section: Discussionmentioning

confidence: 64%

“…Tinca tinca , for example, has been found in tributaries but not yet in the PRD region, possibly due to its inability to adapt to the water environment in this area [61]. Investigations conducted in the lower PRE have shown that sea surface salinity is one of the crucial factors in explaining the variation in fish egg density in spawning grounds [62]. Hence, the findings of this study may hold valuable reference significance for analyzing and predicting the invasion of invasive fish species.…”

Section: Discussionmentioning

confidence: 99%

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Nonnative Fish in the Pearl River Delta: A Comprehensive Study on Their Salinity Adaptability and Potential Distribution Area in Brackish Water

Luo,

Yang,

et al. 2024

Preprint

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After extensive aquaculture, urbanization, and industrial development, the Pearl River Delta (PRD) has undergone profound environmental changes, with biological invasion emerging as a consequential anthropogenic byproduct, carrying significant implications for natural ecosystems, human health, and the economy. Despite these transformations, our understanding of nonnative fish species and their adaptability to the dynamic environmental conditions within the intricate river network of the PRD remains incomplete. To address this, we conducted a systematic survey of nonnative fish species in PRD waters through literature reviews. Then we analyzed the salinity adaptation of these fish, coupled with a spatial examination of salinity distribution, to comprehensively understand the potential invasion mechanisms of exotic fish in the region. Our findings identified 25 nonnative fish species in PRD waters, with three being translocated species within China and the remaining 22 being exotic introductions. Phylogenetically, these fish are broadly distributed among several orders, with Cichliformes, Perciformes, Cypriniformes, and Siluriformes emerging as the predominant orders. Despite most of the nonnative fish being freshwater species and exhibiting species-specific differences in salinity adaptability, they generally demonstrated an average salinity tolerance of 23.74 ppt, allowing them to adjust to brackish water. The diversity of species declined as the relative distance decreased from the upstream of the Pearl River Estuary (PRE) to its mouth in the sea (p < 0.01). Spatial analysis unveiled pronounced heterogeneity in salinity distribution, particularly in the east PRE of the LingDing Bay, featuring a sizable area with brackish water. Notably, under salinity intrusion circumstances, a gap region between salinity levels of 5.0 ppt and 15.0 ppt, spanning 3111.2 km2, emerged as a potential adaptation zone for nonnative fish. By emphasizing salinity as a key factor, our study may contribute to elucidating invasion mechanisms and enhancing the assessment of invasion risks in estuarine environments.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Nonnative Fish in the Pearl River Delta: A Comprehensive Study on Their Salinity Adaptability and Potential Distribution Area in Brackish Water

Luo,

Yang,

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Tinca tinca, for example, has been found in tributaries but not yet in the PRD region, possibly due to its inability to adapt to the water environment in this area (Ding, 2020). Investigations conducted in the lower PRE have shown that sea surface salinity is one of the crucial factors in explaining the variation in sh egg density in spawning grounds (Wang et al, 2021). Hence, the ndings of this study may hold valuable reference signi cance for analyzing and predicting the invasion of invasive sh species.…”

Section: Discussionmentioning

confidence: 70%

Nonnative fish in the Pearl River Delta: A comprehensive study on their salinity adaptability and potential distribution area in brackish water

Luo,

Yang,

et al. 2024

Preprint

View full text Add to dashboard Cite

The Pearl River Delta (PRD) has undergone significant environmental changes resulting from anthropogenic activities, with bio-invasion emerging as one of the most consequential byproducts. Despite these apparent transformations, our understanding of nonnative fish species and their adaptability to the environment remains incomplete, compounded by the complexity of the river network. To address this, we conducted a literature survey to screen the nonnative fish species. Subsequently, we analyzed the fish's salinity adaptation capability, spatial variations in alpha diversity, and trophic level. Thirdly, we simulated the distribution of salinity under conditions of salinity intrusion. Our findings identified 25 nonnative fish species, phylogenetically belonging to nine orders, with three being translocated species within China and the remaining 22 being exotic introductions. Although most of the nonnative fish are freshwater species and exhibit species-specific differences in salinity tolerance, they generally can adapt to brackish water, with an average salinity tolerance of 23.74 ppt. The diversity of nonnative fish declined as the relative distance decreased from the upstream of the Pearl River Estuary (PRE) to its mouth in the sea (p < 0.01). Spatial analysis unveiled pronounced heterogeneity in salinity distribution, particularly in the east PRE of the LingDing Bay. Notably, under salinity intrusion circumstances, a gap region between salinity levels of 5.0 ppt and 15.0 ppt, spanning 3111.2 km2, emerged as a potential adaptation zone for nonnative fish. By emphasizing salinity as a key factor, our study may contribute to elucidating invasion mechanisms and enhancing the assessment of invasion risks in estuarine environments.

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“…Elemental concentrations in otolith cores can reflect spawning area environments (Mu et al, 2021), while the otolith edge can reflect the current habitat environment where the fish are caught. Spawning grounds are critical for fish survival and reproduction and play a key role in supplementing fishery resources (Wang et al, 2021). The difference analysis showed no significant differences between the otolith cores of the three sampling areas.…”

Section: Possibility Of Spawning Areas For a Latus In The Waters Of M...mentioning

confidence: 84%

Acanthopagrus latus migration patterns and habitat use in Wanshan Islands, Pearl River Estuary, determined using otolith microchemical analysis

Tang

Liu

et al. 2023

Front. Mar. Sci.

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IntroductionThe waters surrounding the Wanshan Islands are important traditional fishing grounds in China, with rich habitat types. Acanthopagrus latus is an economically important species in this area; however, the distribution of its spawning grounds and habitat use patterns remain unknown.MethodsThus 100 otolith samples of A. latus were collected from three geographic areas (MW: Qi’ao Island Mangrove Water Habitat; OW: Yamen Estuary Oyster Farm Water Habitat; RW: Dong’ao-Guishan Island Reef Water Habitat), and the concentrations of Sr and Ca along the shortest axis of the vertical otolith annual or lunar rings were measured to span the entire life cycle of A. latus, with the core and edge areas corresponding to environmental characteristics at birth and capture, respectively.Results and discussionAnalysis of covariance (ANCOVA) revealed that the ratios of Sr/Ca in otolith edges of RW samples are significantly higher than those of OW and MW samples; however, both the values of Sr/Ca ratio in otolith cores collected from OW and MW are comparable with those of RW samples. Cluster analysis and non-metric multidimensional scaling (nMDS) indicated that at the juvenile stage, RW and MW individuals in the two main clusters belonged to the same cluster. There was no significant difference between the cores of the RW samples and the edges of the MW and OW samples. Therefore, the spawning area of A. latus in the Wanshan Islands is thought to have originated from low to medium-salinity waters with mangroves and oyster farm habitats in the Pearl River Estuary. A. latus from RW was found to have three distinct habitat-use patterns: 1) Marine Resident (7.2% of sampled fish) fish that remain in marine habitats for life; 2) Marine Migrant (16.4% of sampled fish) juveniles inhabit low to moderate salinity habitats and migrate to marine habitats as they grow; 3) Estuarine Visitor (76.4% of sampled fish) repeated migration between low to moderate salinity and marine habitats. This suggests widespread migration between estuarine and marine habitats throughout the ontogeny. The plasticity of this habitat use and the protection of spawning grounds should be considered in future fisheries management because A. Latus in this area has been the victim of the overexploitation of resources.

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Response to Environmental Factors of Spawning Ground in the Pearl River Estuary, China

Cited by 8 publications

References 53 publications

Nonnative Fish in the Pearl River Delta: A Comprehensive Study on Their Salinity Adaptability and Potential Distribution Area in Brackish Water

Nonnative Fish in the Pearl River Delta: A Comprehensive Study on Their Salinity Adaptability and Potential Distribution Area in Brackish Water

Nonnative fish in the Pearl River Delta: A comprehensive study on their salinity adaptability and potential distribution area in brackish water

Acanthopagrus latus migration patterns and habitat use in Wanshan Islands, Pearl River Estuary, determined using otolith microchemical analysis

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