Seasonal changes in abiotic environmental conditions in the Busan coastal region (South Korea) due to the Nakdong River in 2013 and effect of these changes on phytoplankton communities

Baek, Seung Ho; Kim, Dongseon; Kim, Young Ok; Son, Moonho; Kim, Yun-Ji; Lee, Minji; Park, Bum Soo

doi:10.1016/j.csr.2019.01.014

Cited by 34 publications

(35 citation statements)

References 29 publications

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“…It is well known that wind affects water stability and turbulence. Our finding of high phytoplankton abundance during the winter throughout the whole water column is similar to the findings of Yin et al [23] and Baek et al [9]. These results thus confirm that mixing of the whole water column by winter windstorms and low surface temperature (due to the sinking of high-density water) is likely to be a key event in regulating the biotic and abiotic characteristics of the water column.…”

Section: Vertical Variations Of Biotic and Abiotic Factorssupporting

confidence: 92%

“…Our previous seasonal survey also demonstrated that Cryptomonas spp. were predominant (> 70%) during the autumn in the Seomjin estuarine region in Gwangyang Bay [2] and in the Nakdong Estuary [9]. As demonstrated by Klaveness [26], cryptophytes grow well in the presence of pulsed nutrient loading and tend to dominate when nutrient conditions are non-limiting.…”

Section: Phytoplankton Community Structure and Characteristics Of Phymentioning

confidence: 98%

“…This suggests that a relatively high water temperature was maintained within the Busan coastal water (Zone III) because of the introduction of a large amount of warm water from the TWC and a relatively small input of cold freshwater from the Nakdong River during the winter. Baek et al [9] reported that the Busan coast is affected by the TWC throughout the year, and thus has relatively warm water (>10 • C) even during winter. Whereas, we found no difference in salinity between the three zones (p > 0.01; ANOVA).…”

Section: Spatial and Temporal Variations Of Biotic And Abiotic Factorsmentioning

confidence: 99%

“…Overall, phytoplankton blooms can be partially explained by the distribution of nutrients within the water mass [6]. In particular, a sudden supply of nutrients from river discharge after rainfall and nutrient supplementation of euphotic layers by upwelling and turbulence caused by episodic wind typically promote phytoplankton growth in coastal environments [7][8][9]. Track of Typhoon Chaba, with blue symbols indicating the range affecting the study area.…”

Section: Introductionmentioning

confidence: 99%

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Variation in Phytoplankton Community Due to an Autumn Typhoon and Winter Water Turbulence in Southern Korean Coastal Waters

et al. 2020

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We evaluated changes in the phytoplankton community in Korean coastal waters during October 2016 and February 2017. Typhoon Chaba introduced a large amount of freshwater into the coastal areas during autumn 2016, and there was a significant negative relationship between salinity and nutrients in the Nakdong estuarine area, particularly in the northeastern area (Zone III; p < 0.001). The abundance of diatom species, mainly Chaetoceros spp., increased after this nutrient loading, whereas Cryptomonas spp. appeared as opportunists when there was relatively low diatom biomass. During winter, biotic and abiotic factors did not differ among the surface, middle, and lower layers (p > 0.01; ANOVA), implying that water mixing by winter windstorms and low surface temperature (due to the sinking of high-density water) physically accelerated mixing of the whole water column. Diatoms predominated under these conditions. Among diatoms, the centric diatom Eucampia zodiacus remained at high density at the inshore area and its abundance had a negative correlation with water temperature, implying that this species can grow at cold temperatures. On the other hand, the harmful freshwater diatom Stephanodiscus hantzschii mainly appeared in conditions with low salinity and high nutrients, implying that it can persist even in the saltwater conditions of the Nakdong Estuary. Our results indicate that hydro-oceanographic characteristics, such as river discharge after an autumn typhoon and winter water turbulence, have major effects on the composition of phytoplankton communities and can potentially affect the occurrence and characteristics of harmful algal blooms in southern Korean coastal waters.

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Section: Vertical Variations Of Biotic and Abiotic Factorssupporting

confidence: 92%

Section: Phytoplankton Community Structure and Characteristics Of Phymentioning

confidence: 98%

Section: Spatial and Temporal Variations Of Biotic And Abiotic Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variation in Phytoplankton Community Due to an Autumn Typhoon and Winter Water Turbulence in Southern Korean Coastal Waters

et al. 2020

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“…(1999). In general, marine diatom is predominant taxa when nutrient loading occurs around KCW in summer (Baek et al., 2019; Kim, Gwak, et al., 2019; Kim, Kim, et al., 2019). Thus, to more accurately evaluate response of bacterioplankton communities to nutrient loading in KCW, we added silicate (+Si; 30 µM,) into both the control and treatments to prevent the side‐effect of silicate shortage on phytoplankton communities.…”

Section: Methodsmentioning

confidence: 99%

Response of the bacterioplankton composition to inorganic nutrient loading and phytoplankton in southern Korean coastal waters: A mesocosm study

et al. 2020

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In Korean coastal waters (KCW), nutrient loading from the four major rivers usually peaks in summer, probably due to the large amount of water discharge in rainy seasons, but little is known about the responses of the bacterial community composition to inorganic nutrient loading. To gain deeper understanding of variations in marine microbial biodiversity and function with inorganic nutrient loading, a large‐scale mesocosm (1,000 L) experiment was conducted in southern KCW for 10 days in summer (July 27 through August 6, 2015) and the bacterioplankton community composition (BCC) was investigated using 16S rRNA amplicon pyrosequencing method. The bioassays established in the mesocosm were designed with the following each nutrient dosing treatments: nitrate (+N), phosphate (+P), and nitrate plus phosphate (+NP). Among the three treatments, the +NP and +N treatments exhibited the largest and second‐largest increases in phytoplankton abundance, respectively, whereas there was relatively less variation under the +P treatment. Enhanced growth of phytoplankton not only induced increases in pH and bacterial abundance (p < .05) but also led to changes in the BCC: the orders Flavobacteria, Micrococcales, Oceanospirillales, and Rhodobacterales exhibited increases in relative abundance, whereas Methylophilales, Puniceicoccales, SAR11, SAR116, and SAR86 showed a decreasing trend. Inorganic nutrients may directly contribute to variation in the BCC, as the relative abundance of Sphingobacteriales, containing members that undergo chemotaxis toward inorganic nutrients, was increased by the +N treatment. Given that these findings, changes in phytoplankton abundance due to nutrient addition may be the most crucial component resulting in variation in the BCC.

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Short-term response of pelagic planktonic communities after inoculation with the mass cultured dinoflagellate Alexandrium affine in a large-scale mesocosm experiment

et al. 2021

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Seasonal changes in abiotic environmental conditions in the Busan coastal region (South Korea) due to the Nakdong River in 2013 and effect of these changes on phytoplankton communities

Cited by 34 publications

References 29 publications

Variation in Phytoplankton Community Due to an Autumn Typhoon and Winter Water Turbulence in Southern Korean Coastal Waters

Variation in Phytoplankton Community Due to an Autumn Typhoon and Winter Water Turbulence in Southern Korean Coastal Waters

Response of the bacterioplankton composition to inorganic nutrient loading and phytoplankton in southern Korean coastal waters: A mesocosm study

Short-term response of pelagic planktonic communities after inoculation with the mass cultured dinoflagellate Alexandrium affine in a large-scale mesocosm experiment

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