Spatiotemporal variation, composition of DIN and its contribution to eutrophication in coastal waters adjacent to Hainan Island, China

Zhang, Peng; Peng, Conghui; Dai, Peidong; Lai, Jinyu; Zhao, Lingjuan; Zhang, Jibiao

doi:10.1016/j.rsma.2020.101332

Cited by 21 publications

(18 citation statements)

References 25 publications

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“…Land-based pollutants, including industrial, domestic sewage, and agricultural non-point source pollution, increased every year and flowed into the ocean with the river and resulted in eutrophication of the sea area [ 29 , 30 , 31 ]. Compared with other sea areas, the eutrophication in the East China Sea was the most serious, which drove HABs in this area.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Harmful Algal Species in the Coastal Waters of China from 1990 to 2017

Hou

Chen

et al. 2022

Toxins

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Harmful algal blooms (HABs) have occurred frequently in coastal waters of China, imposing negative effects on the marine ecological environment. A dataset of HABs and terrestrial runoff was collected and analyzed in this study, and factors responsible for HABs were further explored. Frequency and expansion of HABs peaked between 2001 and 2007, and although they have declined slightly since then, they have remained quite high. Frequency and accumulative area of HABs peaked in 2004–2005, and most occurred from April to August during these years. HABs occurred frequently in the Changjiang (Yangtze River) estuary, and Prorocentrum donghaiense, Noctiluca scientillans, Karenia mikimotoi, and Skeletonema costatum were the main algal species. The increases of eutrophication, the abnormal sea surface temperature caused by climate and ocean currents, and the species invasion caused by the discharge of ballast water may be important factors for the long-term outbreak of HABs in the Chinese coastal waters. These findings provide a better understanding of HABs in China, which will be helpful to further prevention and control.

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Section: Discussionmentioning

confidence: 99%

Characteristics of Harmful Algal Species in the Coastal Waters of China from 1990 to 2017

Hou

Chen

et al. 2022

Toxins

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“…The appropriate concentration and speciation of nitrogen and phosphorus in seawater are conducive to phytoplankton growth (Davidson et al, 2014;Ma and Zhao, 2021;Zhou et al, 2022). In recent years, with the rapid development of human society, many pollutants produced from human activities have entered coastal waters through rivers, causing coastal water pollution (Strokal et al, 2014;Zhang et al, 2019). In particular, the excessive discharge of anthropogenic nitrogen and phosphorus has led to widespread eutrophication of coastal waters (Painting et al, 2007;Lu et al, 2009;Paerl et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of river input flux on spatiotemporal patterns of total nitrogen and phosphorus in the Pearl River Estuary, China

et al. 2023

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The increasing riverine nutrient sources have significantly affected the ecological environment of estuaries and coastal waters, resulting in deteriorating land-sea water quality and intensified eutrophication. However, the effects of river input flux on spatiotemporal patterns of total nitrogen (TN) and total phosphorus (TP) were poorly understood in the Pearl River Estuary (PRE). In this study, the spatiotemporal patterns of TN and TP concentrations and river input flux of PRE were studied based on the seasonal nutrients monitoring data obtained for the rivers and estuary in 2019. The results showed the spatiotemporal patterns of the TN and TP concentrations in the eight rivers of the PRE were different, and the annual average concentrations of TN and TP in the rivers entering the PRE were 207.18 ± 105.13 and 3.51 ± 1.70 μmol/L, respectively. The annual river TN and TP fluxes discharged into the PRE were 8.61 × 1010 and 1.55 × 109 mol/year, respectively. In addition, the significantly decreasing trends in of TN and TP concentrations from upper estuary to offshore seawater were observed in the PRE, which implied TN and TP showed conservative behaviour in all season and only the dry season, respectively. Moreover, the annual average concentrations of TN and TP in the estuary were 70.64 ± 10.10 and 1.67 ± 0.78 μmol/L, respectively. The annual average ratios of TN/TP for rivers, freshwater, mixed and seawater were 59.31 ± 5.98, 59.45 ± 3.75, 45.73 ± 21.27 and 330.94 ± 434.71 respectively, which were higher than the Redfield ratios. These results indicated that the water quality in most areas of the PRE is significantly polluted and that the TN and TP in seawater were significantly influenced by river inputs. Therefore, monitoring and management of unified TN and TP nutrient indicators discharge from rivers entering the sea can be strengthened in the PRE, and eutrophication mitigation strategy should be established and implemented across river-estuary-coast continuum systems in the Great Bay Area.

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“…The increasing human population is responsible for a significant increase in water-polluting nutrients, contributing to escalating pressure of human stressors, adversely affecting some existing aquatic ecosystems (such as coral reefs and seagrass) through the direct and indirect mechanisms. In a long time, these conditions with low flushing could also promote eutrophication (Kelly et al, 2021 ; Kermagoret et al, 2019 ; Vigouroux et al, 2021 ; Zhang et al, 2020 ), the decline in the quality of coastal ecosystems and the environment (D'Angelo & Wiedenmann, 2013 ; Devlin et al, 2015 ; Jiang et al, 2013 ; Kermagoret et al, 2019 ; Redding et al, 2013 ; Zhu et al, 2021 ), and reduce the value of the water utilization, including for water-based tourism activities such as swimming, snorkeling, diving, surfing and canoeing (WHO, 2003 ; Pharino, 2007 ; Ngah et al, 2012 ; Cheung et al, 2015 ). Moreover, poor water quality also induces deleterious effects on human health due to bacterial infection (Cheung et al, 2015 ; Thoe et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Hypothetical effects assessment of tourism on coastal water quality in the Marine Tourism Park of the Gili Matra Islands, Indonesia

Kurniawan

2022

Environ Dev Sustain

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Tourism is one of the most important issues facing marine protected areas (MPAs) and small islands worldwide. Tourism development is considered a contribution to pollution levels in the environment. This paper aims to evaluate the hypothetical effects of tourism development on water quality spatially and temporally using the coastal water quality index (CWQI) and Geographic Information System (GIS) in search of improved management for marine conservation areas. This study showed significant tourism influences on the CWQI in the Marine Tourism Park of the Gili Matra Islands, Lombok, Indonesia. Water quality variability indicates a significant spatiotemporal difference ( p < 0.05) in the two tourism seasons. During the peak season of tourism, the CWQI decreased to poor conditions, i.e., ranging from 9.95 to 21.49 for marine biota and from 7.98 to 30.42 for marine tourism activities in 2013, and ranging from 39.52 to 44.42 for marine biota and from 44.13 to 47.28 for marine tourism activities, which were below the standard for both marine biota and marine tourism activities. On the contrary, it showed a better level (from poor to moderate) during the low season of tourism (ranging from 41.92 to 61.84 for marine biota and from 48.06 to 65.27 for marine tourism activities in 2014), providing a more acceptable condition for both aspects. The study proved that massive tourism development in the MPA and small islands could reduce water quality and increase vulnerability. Accordingly, integrated tourism management and the environment, waters, and land will be needed to develop sustainable tourism. The CWQI and GIS were applicable to assess water quality, both spatially and temporally, and become a quick reference in monitoring and initial evaluation of impact management.

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Spatiotemporal variation, composition of DIN and its contribution to eutrophication in coastal waters adjacent to Hainan Island, China

Cited by 21 publications

References 25 publications

Characteristics of Harmful Algal Species in the Coastal Waters of China from 1990 to 2017

Characteristics of Harmful Algal Species in the Coastal Waters of China from 1990 to 2017

Effects of river input flux on spatiotemporal patterns of total nitrogen and phosphorus in the Pearl River Estuary, China

Hypothetical effects assessment of tourism on coastal water quality in the Marine Tourism Park of the Gili Matra Islands, Indonesia

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