Primary productivity and phytoplankton community structure in surface waters of the western subarctic Pacific and the Bering Sea during summer with reference to bloom stages

Waga, Hisatomo; Fujiwara, Amane; Hirawake, Toru; Suzuki, Koji; Yoshida, Kazuhiro; Abe, Hiroto; Nomura, Daïki

doi:10.1016/j.pocean.2021.102738

Cited by 13 publications

(10 citation statements)

References 45 publications

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“…Based on the results of pigment analysis in the same expedition, the haptophytes, pelagophytes, and chlorophytes were the major groups of the phytoplankton community (fig. 3 in Waga et al 2022). The growth rates of total phytoplankton and the two size groups (> 20 and < 20 μm) were not different from each other with average values of 0.30 AE 0.15, 0.34 AE 0.21, and 0.26 AE 0.18 d À1 , respectively (F 2,74 = 1.9; p = 0.16; Figs.…”

Section: Western Bering Sea Basinmentioning

confidence: 99%

“…In this post-bloom period, the phytoplankton community has been reshaped, in which diatoms comprised a small proportion but haptophytes and cryptophytes were the major phytoplankton groups (the results from the same expedition; fig. 3 in Waga et al 2022). The blooms in the Kamchatka Strait were initiated by the Ferich freshwater input from the Kamchatka Peninsula to the Strait, and its influence expanded to adjacent coastal waters (Nishioka et al 2021).…”

Section: Phytoplankton Growth Rates: Effects Of Nutrient Availability...mentioning

confidence: 99%

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Role of nutrients and temperature in shaping distinct summer phytoplankton and microzooplankton population dynamics in the western North Pacific and Bering Sea

Liu

Nishioka

Chen

et al. 2023

Limnology & Oceanography

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Phytoplankton growth and microzooplankton grazing are two critical processes in marine food webs, but they remain understudied in the vast area of the subarctic western Pacific and the Bering Sea. In this study, we measured phytoplankton growth and microzooplankton grazing rates in these less‐explored regions to demonstrate their spatial patterns and investigate underlying mechanisms driving the planktonic food web dynamics. Our results showed that the phytoplankton growth in these regions was determined by nutrient availability and temperature. In the high‐nutrient, low‐chlorophyll regions (HNLC), iron availability was the primary factor limiting phytoplankton growth. In contrast, phytoplankton growth in the Gulf of Anadyr and Kamchatka Strait was mainly limited by inorganic nitrogen exhausted by the summer blooms. We found that microzooplankton grazing rate was affected by temperature and prey availability, highlighting the positive effect of temperature. Strong top‐down control on phytoplankton by microzooplankton in the Gulf of Anadyr and Kamchatka Strait indicated an active microbial food web with high turnover rates. In contrast, the decoupling of phytoplankton growth and microzooplankton grazing in the HNLC regions illustrates a weak role of microzooplankton in the marine food web. These results indicated different food web structures in the areas with and without riverine iron input. By revealing the roles of temperature and nutrient or prey availability in regulating the spatial variability of plankton rates, we expect that the plankton will respond differently to ocean warming between the HNLC and coastal regions of the subarctic Pacific due to different nutrient conditions. Our study helps understand how marine plankton will respond to environmental changes at high latitudes.

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Section: Western Bering Sea Basinmentioning

confidence: 99%

Section: Phytoplankton Growth Rates: Effects Of Nutrient Availability...mentioning

confidence: 99%

Role of nutrients and temperature in shaping distinct summer phytoplankton and microzooplankton population dynamics in the western North Pacific and Bering Sea

Liu

Nishioka

Chen

et al. 2023

Limnology & Oceanography

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“…This is a hindrance in studying the spatial and temporal dynamics of phytoplankton assemblages in the natural environment (Hattori et al, 2004;Wang et al, 2022). Traditionally, information on phytoplankton assemblages is determined through the use of taxonomic methods (i.e., microscopic observation and HPLCpigment analyses) (e.g., Hattori et al, 2004;Fujiki et al, 2009;Kwak et al, 2014;Waga et al, 2022). Only large phytoplankton (> 10 mm, such as diatoms and dinoflagellates) were identified and counted by light microscopy in most previous studies due to the lack of distinguishing characteristics of small phytoplankton and the limitation of microscope resolution (Hattori et al, 2004;Komuro et al, 2005;Fujiki et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…By comparison, HPLC-pigment CHEMTAX analyses are highly efficient in measuring the biomass of different phytoplankton assemblages, including picoplankton and fragile cells (e.g., cryptophytes), in batches. Consequently, HPLC-pigment analyses have been widely used for qualitative and quantitative analyses of phytoplankton groups in various sea areas (e.g., Obayashi et al, 2001;Fujiki et al, 2009;Kwak et al, 2014;Waga et al, 2022). Nevertheless, the main problem with HPLC-pigment CHEMTAX is that the phytoplankton population classification is at the phylum level, not at the species level or even the class level.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the phytoplankton community structure and the correlation between phytoplankton assemblages and environmental factors in this area have been extensively studied. Nevertheless, phytoplankton community structure was investigated by microscopy and HPLCpigment methods in previous studies (e.g., Suzuki et al, 2002;Harrison et al, 2004;Fujiki et al, 2009;Kwak et al, 2014;Waga et al, 2022). Information on the molecular composition of phytoplankton is very limited in the WSG, which suggests a significant knowledge gap in understanding the spatial and temporal distribution of the algal community.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton community structure in the Western Subarctic Gyre of the Pacific Ocean during summer determined by a combined approach of HPLC-pigment CHEMTAX and metabarcoding sequencing

Xin

Qin

et al. 2023

Front. Mar. Sci.

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The Western Subarctic Gyre (WSG) is a cyclonic upwelling gyre in the northwest subarctic Pacific, which is a region with a high concentration of nutrients but low chlorophyll. We investigated the community structure and spatial distribution of phytoplankton in this area by using HPLC-pigment CHEMTAX (a chemotaxonomy program) and metabarcoding sequencing during the summer of 2021. The phytoplankton community showed significant differences between the two methods. The CHEMTAX analyses identified eight major marine phytoplankton assemblages. Cryptophytes were the major contributors (24.96%) to the total Chl a, followed by pelagophytes, prymnesiophytes, diatoms, and chlorophytes. The eukaryotic phytoplankton OTUs obtained by metabarcoding were categorized into 149 species in 96 genera of 6 major groups (diatoms, prymnesiophytes, pelagophytes, chlorophytes, cryptophytes, and dinoflagellates). Dinoflagellates were the most abundant group, accounting for 44.74% of the total OTUs obtained, followed by cryptophytes and pelagophytes. Sixteen out of the 97 identified species were annotated as harmful algal species, and Heterocapsa rotundata, Karlodinium veneficum, and Aureococcus anophagefferens were assigned to the abundant group (i.e., at least 0.1% of the total reads). Nutrients were more important in shaping the phytoplankton community than temperature and salinity. The 24 stations were divided into southern and northern regions along 44°N according to the k-means method, with the former being dominated by high Chl a and low nutrients. Although different phytoplankton assemblages analyzed by the two methods showed various relationships with environmental factors, a common feature was that the dinoflagellate proportion showed a significantly negative correlation with low nutrients and a positive correlation with Chl a.

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Characterizing the Phytoplankton Composition and Production in the Estuarine and Oceanic Waters Along the Indian Coastline

Das,

Chanda

2023

Dynamics of Planktonic Primary Productivity in the Indian Ocean

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Primary productivity and phytoplankton community structure in surface waters of the western subarctic Pacific and the Bering Sea during summer with reference to bloom stages

Cited by 13 publications

References 45 publications

Role of nutrients and temperature in shaping distinct summer phytoplankton and microzooplankton population dynamics in the western North Pacific and Bering Sea

Role of nutrients and temperature in shaping distinct summer phytoplankton and microzooplankton population dynamics in the western North Pacific and Bering Sea

Phytoplankton community structure in the Western Subarctic Gyre of the Pacific Ocean during summer determined by a combined approach of HPLC-pigment CHEMTAX and metabarcoding sequencing

Characterizing the Phytoplankton Composition and Production in the Estuarine and Oceanic Waters Along the Indian Coastline

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