Effects of changing nutrient inputs on the ratio of small pelagic fish stock and phytoplankton biomass in the Black Sea

Yunev, Oleg A.; Velikova, Violeta; Carstensen, Jacob

doi:10.1016/j.ecss.2017.08.033

Cited by 15 publications

(7 citation statements)

References 44 publications

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“…After the construction of the Three Gorges Dam, the chlorophyll peak in the Yangtze River estuary shifted to the direction of low salinity. The altered flow fluxes, sediment fluxes, and nutrient supply patterns could affect the quantity and structure of phytoplankton, zooplankton, and even the benthic communities [110]. The dam construction has greatly impacted the distribution of chlorophyll a in the Yangtze River estuary [34].…”

Section: Effects Of Dam Construction On Ecosystems Of the Estuary And...mentioning

confidence: 99%

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

et al. 2022

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Dams have made great contributions to human society, facilitating flood control, power generation, shipping, agriculture, and industry. However, the construction of dams greatly impacts downstream ecological environments and nearby marine areas. The present manuscript presents a comprehensive review of the influence of human activities on the environment, especially the effect of dam construction on the ecosystems of river estuaries and nearby marine areas, so as to provide a scientific basis for ecological environment protection. To summarize these impacts, this review used recent studies to comprehensively analyze how dam construction has affected river hydrology, geomorphology, and downstream ecosystems globally. Effects of dams on ecosystems occur through reduced river flow, reduced sediment flux, altered water temperature, changed estuary delta, altered composition and distribution of nutrients, altered structure and distribution of phytoplankton populations, habitat fragmentation, and blocked migration routes in river sections and adjacent seas. Effects of dam construction (especially the Three Gorges Dam) on the Yangtze River were also reviewed. Performing community and mitigation planning before dam construction, exploring new reservoir management strategies (including targeted control of dam storage and flushing sediment operations), banning fishing activities, and removing unnecessary dams (obsolete or small dams) are becoming crucial tools for ecosystem restoration.

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Section: Effects Of Dam Construction On Ecosystems Of the Estuary And...mentioning

confidence: 99%

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

et al. 2022

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“…Since the 1980s, the BS nutrient structure has shifted from N‐limited to P‐limited, the dominant phytoplankton gradually shifted from diatoms to diatoms–dinoflagellates, and the phytoplankton structure gradually simplified, while jellyfish blooms and deficits in fishery resources became apparent (J. Zhang et al., 2015). It is generally believed that an increase in the flux of nitrogen and phosphorus leads to an increase in phytoplankton biomass, which in turn leads to harmful algal blooms and subsequently to the decline of fishery resources (Yunev et al., 2017). However, these mechanisms cannot explain the structural changes and imbalance of phytoplankton population in BS.…”

Section: Introductionmentioning

confidence: 99%

“…As the surrounding areas are mostly economically developed regions, with the rapid economic and social development of coastal areas, many terrestrial pollutants are discharged into the coastal ocean (Bernhardt & Leslie, 2013). Coastal environmental problems caused by the discharge of terrestrial pollutants include increasing numbers of harmful algal blooms, jellyfish blooms, and fishery resource deficits (Yunev et al., 2017). These environmental problems are the manifestation of ecological imbalance, which is not only harmful for the sustainable development of coastal ecological health but also restricts economic and social development (Ryabinin et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…pollutants include increasing numbers of harmful algal blooms, jellyfish blooms, and fishery resource deficits (Yunev et al, 2017). These environmental problems are the manifestation of ecological imbalance, which is not only harmful for the sustainable development of coastal ecological health but also restricts economic and social development (Ryabinin et al, 2019).…”

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confidence: 99%

“…Zhang et al, 2015). It is generally believed that an increase in the flux of nitrogen and phosphorus leads to an increase in phytoplankton biomass, which in turn leads to harmful algal blooms and subsequently to the decline of fishery resources (Yunev et al, 2017). However, these mechanisms cannot explain the structural changes and imbalance of phytoplankton population in BS.…”

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confidence: 99%

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Was Dissolved Nitrogen Regime Driving Diatom to Dinoflagellate Shift in the Bohai Sea? Evidences From Microcosm Experiment and Modeling Reproduction

Chen

Gao

et al. 2022

JGR Biogeosciences

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The shift of diatom dominance to combination of diatom and dinoflagellate dominance in the Bohai Sea (BS), China might be associated with the change of dissolved nitrogen (DN). This study combines field investigation, ship‐based microcosm experiments, a nitrogen biogeochemical model, and statistical analysis to reveal the impact of DN loading on the dominance of diatoms and dinoflagellates in the BS, considering the quantitative relationship between the algal growth/death and nitrogen migration/transformation processes. The diatom to diatom‐dinoflagellate shift was significantly associated with the DN regime shift of oxidized nitrogen (NO3‐N) to reduced nitrogen (NH4‐N and dissolved organic nitrogen [DON]) since the mid‐1990s. This phenomenon was supported by microcosm and numerical experiments: (a) Gonyaulax verior as a dominant dinoflagellate in the BS efficiently absorbed/assimilated NH4‐N, and it can also utilize DON derived from centric diatoms; Chaetoceros densus as dominant centric diatoms in the BS was able to absorb/assimilate NO3‐N, and it can also utilize DON derived from the Xiaoqing River; (b) The change in dinoflagellates/diatoms ratios was reproduced with the change in DN regime from the 1980s to the 2010s by the proposed nitrogen biogeochemical model based on localized parameters in the BS. Moreover, mixotrophism and stronger survival stability, associated with the faster NH4‐N and DONalgal uptake and slower decomposition of G. verior, also supported the shift from diatoms to diatoms–dinoflagellates during high variations in nutrient supply. This study infers the phytoplankton regime shift mechanism associated with the DN structure in coastal waters, providing a credible scientific basis for the shift from water quality‐based to ecosystem‐based environmental management.

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Spatial, temporal, and vertical variability of nutrients in the Southeastern Black Sea

et al. 2022

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Effects of changing nutrient inputs on the ratio of small pelagic fish stock and phytoplankton biomass in the Black Sea

Cited by 15 publications

References 44 publications

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Was Dissolved Nitrogen Regime Driving Diatom to Dinoflagellate Shift in the Bohai Sea? Evidences From Microcosm Experiment and Modeling Reproduction

Spatial, temporal, and vertical variability of nutrients in the Southeastern Black Sea

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