A trophic model of the Pearl River Delta coastal ecosystem

Duan, Lijie; Li, S.; Liu, Yu; Jiang, Tao; Failler, Pierre

doi:10.1016/j.ocecoaman.2009.04.005

Cited by 26 publications

(25 citation statements)

References 22 publications

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“…According to our previous study [21] [24] [28], with the increasing impact of human activities on estuarine ecosystems and insufficient protective policy, the stocks of commercial exploited species in the PRD decreased dramatically since 1970s. Hairtail, blue scad and pomfret are three main commercial exploited marine species that favored by local residents.…”

Section: The Ecological Impacts Of Fishingmentioning

confidence: 99%

“…These trends were first demonstrated by the fisheries scientist Daniel Pauly," the large predatory fish on top of the food web having depleted, turn to increasingly smaller species, finally ending up with small fish and invertebrates" [30]. It seems that since 1979, the PRD ecosystem has changed dramatically from large-size and high-value demersal fish-based ecosystem to small-size and low-value pelagic fish-based ecosystem [21] [25].…”

Section: The Ecological Impacts Of Fishingmentioning

confidence: 99%

“…is one of the most important fishing grounds in the South China Sea. The inflows of both seawater and fresh water makes it possible to provide abundant nutrients in both the water and sediment, which makes the estuary become one of highest productive natural habitats in the world [21]. The nutrient-rich water resources support the biodiversity and productivity while maintaining the important commercial exploited fisheries.…”

Section: Introductionmentioning

confidence: 99%

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Actual Costs of Uneconomic Growth of Marine Fisheries in China’s Pearl River Delta

Wang¹

2018

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As traditional economic theory is mainly based on neoliberal principles, whose failure is to ignore the ecological component in value assessment methods, it assumes that continuous economic growth exists with high level of employment and low inflation rate. Many ecological economists have criticized the blind pursuit of short-term economic interests in the last 30 years for leading to loss of natural capital and ecosystem services. This study demonstrates the concept of "uneconomic growth" by measuring the actual costs of fishing activities and fishery policy implemented in China's Pearl River Estuary from economic, social, and ecological aspects. The results show that the costs of economic growth exceed the benefits of additional growth because of the limits of the ecosystem. The ecological system of the Pearl River Estuary has been degraded significantly by overfishing and is regarded to be under non-optimal conditions regarding both ecological and socio-economic objectives.

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Section: The Ecological Impacts Of Fishingmentioning

confidence: 99%

Section: The Ecological Impacts Of Fishingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Actual Costs of Uneconomic Growth of Marine Fisheries in China’s Pearl River Delta

Wang¹

2018

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“…While mass-balance models suggest that detritus from various sources is important in supporting food webs in the Pearl River estuary and adjacent waters (Li and Lee 1998;Duan et al 2009), little is known about the relative importance of different detrital sources and their contribution to sustaining consumers at high trophic levels such as sharks and marine mammals.…”

mentioning

confidence: 99%

“…Studies of the importance of various carbon sources to invertebrate and fish communities in Hong Kong coastal waters have shown that consumers at lower trophic levels generally depend on autotrophic carbon sources (Lee 2000;Chen et al 2008;Wai et al 2008), but switch to greater dependence on detrital pathways during the wet, summer monsoon, when the availability of terrestrial-, benthic algal-, and phytoplankton-detritus peaks (Wai et al 2008). While mass-balance models suggest that detritus from various sources is important in supporting food webs in the Pearl River estuary and adjacent waters (Li and Lee 1998;Duan et al 2009), little is known about the relative importance of different detrital sources and their contribution to sustaining consumers at high trophic levels such as sharks and marine mammals.…”

mentioning

confidence: 99%

Spatial, seasonal, and ontogenetic variations in the significance of detrital pathways and terrestrial carbon for a benthic shark, Chiloscyllium plagiosum (Hemiscylliidae), in a tropical estuary

Wai

Leung

Sin

et al. 2011

Limnology & Oceanography

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Using a combination of stable isotope analyses (SIA), fatty acid profiling (FAP), and FA-specific SIA, we investigated the relative importance of terrestrial-and marine-derived carbon, and spatial (inshore vs. offshore), seasonal (wet vs. dry season), and ontogenetic variations, in the relative contribution of detrital pathways to the white-spotted bamboo shark, Chiloscyllium plagiosum in the Pearl River estuary. SIA and FAP suggested the sharks acquired carbon from both marine-and terrestrial-derived detritus via consumption of polychaetes and small crustaceans, with carbon from terrestrial sources being more important to juveniles (25-50 cm long) at inshore locations. Juveniles generally had significantly higher levels of diatom FA, bacterial FA, and long-chaincarbon-saturated FA biomarkers than adults (. 65 cm), especially during the wet season, suggesting that they relied on primary consumers which assimilated a mixture of autotrophic and detrital carbon sources. Levels of zooplankton and animal-derived FA biomarkers generally increased with shark size, indicating an ontogenetic dietary shift. Utilizing the results of FA-specific SIA (i.e., d 13 C values of individual bacterial FA of detritus) from four sources (i.e., terrestrial plant litter, macroalgae, phytoplankton, and sediments), Bayesian mixing models revealed juveniles in the inner estuary assimilated significantly higher amounts of terrestrial carbon (37-45%) than adults (22-37%) or sharks in the outer estuary (1-36%). The combined use of multiple dietary tracers effectively revealed the interaction of various detrital pathways to marine predators in the Pearl River estuary, and highlighted the importance of terrestrial-marine linkages for interpretation of energy flow in coastal ecosystems.

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Temporal and spatial comparison of food web structure in marine pastures in the Pearl River Estuary: Implications for sustainable fisheries management

Zhou

Xie

et al. 2022

Ecology and Evolution

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The biological and ecological integrity of marine ecosystems in the Pearl River Estuary (PRE) has been compromised due to overfishing and water pollution. Fishing moratorium and artificial reef construction have been implemented in Wanshan and Miaowan for resource protection and restoration. Therefore, food web structure and trophic pathways of Wanshan, Miaowan, and Wailingding in different temporal and spatial situation will be determined using the Ecopath model, as well as the keystone species affecting these ecosystems, which can provide a basis for fishery management. The results showed that the energy transfer efficiency of IV and V trophic levels (TL) was higher than that of II and III‐TL before and after fishing moratorium, and the energy transfer efficiency of artificial reefs II and III‐TL was only slightly higher than that of nonartificial reefs in Wanshan. In addition, the mean values of ecosystem property indicators (consumption, respiration flow, total system throughput, and total biomass) after the fishing moratorium were significantly higher than those before the fishing moratorium. The average value of the ecosystem attribute indicators (consumption, respiration flow, total system throughput, and total biomass) of artificial reefs is lower than those of nonartificial reef areas, which may be related to the differences in community composition between artificial reefs and non‐artificial reefs. Finally, Nemipterus japonicus and Gastrophysus spadiceus are keystone species that distinguish the Wanshan and Miaowan artificial reefs from other areas. Overall, the fishing moratorium has a positive effect on the short‐term restoration of fishery resources, mainly restoring short‐life cycle organisms. However, the construction of artificial reefs will be more conducive to the persistence of ecosystem restoration. In addition, reasonable proliferation, release and fishing of N. japonicus and G. spadiceus will be beneficial to the sustainable utilization of fishery resources.

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A trophic model of the Pearl River Delta coastal ecosystem

Cited by 26 publications

References 22 publications

Actual Costs of Uneconomic Growth of Marine Fisheries in China’s Pearl River Delta

Actual Costs of Uneconomic Growth of Marine Fisheries in China’s Pearl River Delta

Spatial, seasonal, and ontogenetic variations in the significance of detrital pathways and terrestrial carbon for a benthic shark, Chiloscyllium plagiosum (Hemiscylliidae), in a tropical estuary

Temporal and spatial comparison of food web structure in marine pastures in the Pearl River Estuary: Implications for sustainable fisheries management

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