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  • MDPI AG  (2)
  • Joo, Huitae  (2)
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  • MDPI AG  (2)
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  • 1
    Online Resource
    Online Resource
    Seasonal Compositions of Size-Fractionated Surface Phytoplankton Communities in the Yellow Sea
    MDPI AG ; 2022
    In:  Journal of Marine Science and Engineering Vol. 10, No. 8 ( 2022-08-08), p. 1087-
    Details
    In: Journal of Marine Science and Engineering, MDPI AG, Vol. 10, No. 8 ( 2022-08-08), p. 1087-
    Abstract: Little information on the phytoplankton community in the Yellow Sea (YS)—especially size-fractionated phytoplankton—is currently available, in comparison to the various physicochemical studies in the literature. Using high-performance liquid chromatography (HPLC), size-fractionated phytoplankton communities were seasonally investigated in the YS in 2019. In the study period, diatoms (55.0 ± 10.2%) and cryptophytes (16.9 ± 9.3%) were the dominant groups. Due to the recent alteration in inorganic nutrient conditions reported in the YS, the contribution of diatoms was lower than in previous studies. The large-sized phytoplankton group ( 〉 20 µm) was dominated mostly by diatoms (89.0 ± 10.6%), while the small-sized phytoplankton group ( 〈 20 µm) was also dominated by diatoms (41.9 ± 9.1%), followed by cryptophytes (19.2 ± 9.8%). The contributions of small-sized diatoms ( 〈 20 µm) have been overlooked in the past, as they are difficult to detect, but this study confirms significant amounts of small-sized diatoms, accounting for 62.3% of the total diatoms in the YS. This study provides an important background for assessing the seasonal variations in different-sized diatom groups in the YS. Further detailed studies on their potential ecological roles should be conducted, in order to better understand marine ecosystems under future warming scenarios.
    Type of Medium: Online Resource
    ISSN: 2077-1312
    URL: Article
    DOI: 10.3390/jmse10081087
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2738390-8
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Photophysiological Characterization of Phytoplankton by Measuring Pigment Production Rates: A Description of Detail Method and a Case Study
    MDPI AG ; 2023
    In:  Journal of Marine Science and Engineering Vol. 11, No. 10 ( 2023-09-25), p. 1859-
    Details
    In: Journal of Marine Science and Engineering, MDPI AG, Vol. 11, No. 10 ( 2023-09-25), p. 1859-
    Abstract: Each phytoplankton species has intrinsic pigments, which result in different photophysiological characteristics in response to natural light conditions. Therefore, phytoplankton pigments provide important information on the photosynthetic activity that produces the basic food source for marine ecosystems. This study addresses the challenge of accurately measuring pigment production rates in phytoplankton communities. Two strategies are proposed for improving measurement sensitivity. Firstly, increasing the injection of 13C substrate into incubation bottles up to 15% of the total dissolved inorganic carbon is recommended, with minimal impact on pigment production rate determinations. Secondly, optimizing sample injection volume for high-performance liquid chromatography balances analysis time and dilution effects. The in situ field experiments conducted in this study for pigment production measurements revealed diminished activity of photoprotective mechanisms involving zeaxanthin and diatoxanthin during the study period. Furthermore, the results showed that the notable production rates of chl-b (0.069–0.105 ng C L–1 h–1, 74–89% of total accessary pigment production rates), an accessory pigment mainly attributed to prasinophytes, potentially due to restricted light availability. Prioritization of chl-b production over primary production (negative correlation between primary and chl-b production; R2 = 0.6662) highlights the potential impact of compensatory pigment-related activities on overall phytoplankton productivity. In conclusion, this study underscores the significance of directly quantifying pigment production rates to enhance our comprehension of phytoplankton photophysiology and the production mechanisms specific to various pigments.
    Type of Medium: Online Resource
    ISSN: 2077-1312
    URL: Article
    DOI: 10.3390/jmse11101859
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2738390-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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