Estuarine dam water discharge enhances summertime primary productivity near the southwestern Korean coast

Kim, Dong‐Young; Ji, Rubao; Feng, Zhixuan; Jang, Jaebin; Lee, Dae-In; Lee, Won Chan; Kang, Chang‐Keun

doi:10.1016/j.marpolbul.2023.114971

Cited by 5 publications

(7 citation statements)

References 64 publications

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“…During the study period, the two estuaries were characterized by diatom dominance and phytoplankton communities distinguished by small phytoplankton populations (e.g., cryptophytes, prasinophytes, pelagophytes, and cyanobacteria), inducing the inter-estuarine dissimilarity of the phytoplankton community. Ubiquitous characteristics of diatoms are consistently observed in estuaries in the temperate zone, such as the marginal zone of the Yellow Sea (Zhou et al, 2008;Kim et al, 2023). Diatoms were the most prevalent group, owing to the well-mixed condition of shallow estuaries in the temperate zone (Mallin et al, 1991;Trigueros and Orive, 2001;Haese et al, 2007).…”

Section: Phenology Of Diatoms and Cryptophytesmentioning

confidence: 99%

“…Nowadays, hydraulic structures (e.g., dams and tidal weirs) are impounded in estuaries for various purposes, including flood control, water supply, tidal intrusion prevention, and hydroelectric power generation (Morris, 2013). Discontinuity in the river continuum in the lower estuary may impact the biomass and community structure of phytoplankton (Kim et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Comparative seasonality of phytoplankton community in two contrasting temperate estuaries on the western coast of Korea

Kim,

Sung,

Kim

et al. 2023

Front. Mar. Sci.

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In estuaries, freshwater discharge functions as a regulator of physicochemical and biological properties. We assessed the seasonal variability of the phytoplankton community in response to hydrological features and nutrient dynamics in two contrasting estuaries in the presence and absence of a dam on the western coast of Korea. Diversity and evenness were also evaluated through chemotaxonomic analysis. Seasonal and inter-estuarine comparisons revealed the overall predominance of diatoms in all seasons and the differentiated composition of small phytoplankton populations in each estuary, which was mainly characterized by significant contribution of cryptophytes in the continuously flushed estuary in contrast to the seasonal occurrence of pelagophytes and cyanobacteria in the intermittently perturbed estuary. Our one-way analysis of similarity and similarity percentage analysis showed obvious inter-estuarine discrepancy of the phytoplankton community in winter in relation to the high dissolved inorganic nitrogen concentration in the natural estuary, implying that the impact of freshwater inflow on the phenological response of phytoplankton can be maximized during active seawater intrusion in dry seasons in the prevalence of freshwater and seawater in the estuary. The contribution swing of diatoms and cryptophytes during the study period reflects the seasonal variability in nutrient dynamics, including absolute concentrations and stoichiometric ratios, which is especially associated with P-limitation on the western coast of Korea. The occurrence of cyanobacteria with a summer peak of phytoplankton biomass in the dammed estuary during the study period indicates the role of an estuarine dam as a conduit transporting phytoplankton and dissolved inorganic nutrients. These findings further suggest that the phytoplankton community structure, differentiated by the presence and absence of dams, influences bottom-up regulation and thus the food web structure in estuaries.

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Section: Phenology Of Diatoms and Cryptophytesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative seasonality of phytoplankton community in two contrasting temperate estuaries on the western coast of Korea

Kim,

Sung,

Kim

et al. 2023

Front. Mar. Sci.

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“…The identity of an ecosystem mainly depends on the distribution and abundance of biologically functional traits and is mostly affected by climate or natural and artificial disturbance [3]. The uncertainty of environmental variables makes it hard to precisely predict or evaluate phytoplankton and dominant species, while the phytoplankton's functional diversity can provide more information [4].…”

Section: Introductionmentioning

confidence: 99%

Responses of Phytoplankton Communities to Flow Regulation in Northeastern Riverine Wetlands of China

Meng,

2023

Diversity

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Among the impacts of dam construction on river ecosystem, runoff regulation and habitat fragmentation are the two major concerns. Herein, the response characteristics of phytoplankton communities to reservoir impoundment and dam interception were explored by taking Manjiang and Songjiang rivers, where a man-made engineering project was constructed, and the natural stretches located in the up-streams as the research objects. The results obtained revealed that the compositions of phytoplankton communities, collected from the 21 sampling sites in the riverine wetlands of reservoir stretch, flow-reduced stretch, and natural stretch, were dissimilar. The communities of phytoplankton were clustered into three groups. The co-occurrence network analysis indicated that the interspecific relationship structures of phytoplankton communities of each group were different. The indicator species Chlamydomonas ovalis, Synedra acus, and Chlamydomonas globosa, belonged to the Reservoir Wetlands Group, Diatoma vulgare, Fragilaria ca pucina, and Meridion circulare belonged to the Flow-reduced Wetlands Group, and Ceratoneis arcus and Treubaria crassispina belonged to the Natural Wetlands Group. The functional group L0 was the absolute dominant group in all three groups of the riverine wetlands, but a discrepancy was that the proportions of functional group X2 and functional group C in the Reservoir Wetlands Group were remarkably higher, while the proportion of functional group MP in the Flow-reduced Wetlands Group was noticeably higher. By assessing the status of the phytoplankton community composition and the functional group structure, we concluded that current velocity and water depth were crucial influencing factors, and the functional group structure based on the classification of livable water could be applied as a good indication for demonstrating phytoplankton community succession.

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confidence: 99%

“…Temperate and polar climatic zones are characterized by strong seasonality with marked seasonal succession in environmental conditions (e.g., light, temperature, and salinity/freshwater discharges; Lindström 2000; Goebeler et al 2022; Kim et al 2023). Winters are defined by short days, cold temperatures, and reduced primary production, whereas summers are characterized by long days and conditions that are permissive for growth and development (Zdun et al 2021; Goebeler et al 2022; Kim et al 2023). Seasonality represents a strong and ubiquitous source of external variation influencing selection on life history strategies of aquatic plants (Kautsky 1988; Temmink et al 2021), favoring high reproductive investment during favorable periods (e.g., summer), but reduced reproductive investment during unfavorable periods characterized by stress (e.g., winter) (Yue et al 2020).…”

mentioning

confidence: 99%

Seasonality strongly affects short‐term C‐storage in coastal macrophyte communities

Lammerant,

Rohlfer,

Norkko

et al. 2024

Limnology & Oceanography

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Ecosystem functions provided by aquatic plants are context dependent and mediated by environmental conditions and plant growth form. This impedes our ability to predict the carbon (i.e., C) sink potential of multispecies coastal meadows characterized by marked seasonal succession of environmental conditions, causing a clear need to explore the distinct patterns of both C capture and release associated with seasonal succession of macrophyte growth forms and life‐history strategies in aquatic plant communities. We conducted four field surveys throughout 2022–2023 (i.e., October, March, June, and August), where we sampled six soft bottom locations dominated by aquatic vascular plants in the northern Baltic Sea. Temporal differences in biomass‐bound C stocks (i.e., structural elements and non‐structural carbohydrates) were linked to the plant production‐decomposition cycle and peaked when environmental conditions became increasingly permissive for growth and development (i.e., summer). Species identity influenced seasonal patterns of non‐structural carbohydrate concentrations in both leaf and rhizome tissue by shaping the timing of short‐term accumulation (i.e., photosynthesis) of C in plant tissue or release through respiration. Overall, our study illustrates that biomass‐bound C stocks were shaped by both seasonality and the variation of functional structure and life history strategies found within the vegetated seascapes. This highlights the importance of addressing both biodiversity and short‐term C dynamics and suggests that estimations of C budgets or stock assessments should be based on data incorporating the intra‐annual variation in C dynamics to fully comprehend the C sink potential of vegetated seascapes.

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Estuarine dam water discharge enhances summertime primary productivity near the southwestern Korean coast

Cited by 5 publications

References 64 publications

Comparative seasonality of phytoplankton community in two contrasting temperate estuaries on the western coast of Korea

Comparative seasonality of phytoplankton community in two contrasting temperate estuaries on the western coast of Korea

Responses of Phytoplankton Communities to Flow Regulation in Northeastern Riverine Wetlands of China

Seasonality strongly affects short‐term C‐storage in coastal macrophyte communities

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