Suzuki Koji

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Last Name
Suzuki
First Name
Koji
ORCID
0000-0001-5354-1044

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  • Article
    Impact of sea-ice dynamics on the spatial distribution of diatom resting stages in sediments of the Pacific Arctic region
    (American Geophysical Union, 2021-06-17) Fukai, Yuri ; Matsuno, Kohei ; Fujiwara, Amane ; Suzuki, Koji ; Richlen, Mindy L. ; Fachon, Evangeline ; Anderson, Donald M.
    The Pacific Arctic region is characterized by seasonal sea-ice, the spatial extent and duration of which varies considerably. In this region, diatoms are the dominant phytoplankton group during spring and summer. To facilitate survival during periods that are less favorable for growth, many diatom species produce resting stages that settle to the seafloor and can serve as a potential inoculum for subsequent blooms. Since diatom assemblage composition is closely related to sea-ice dynamics, detailed studies of biophysical interactions are fundamental to understanding the lower trophic levels of ecosystems in the Pacific Arctic. One way to explore this relationship is by comparing the distribution and abundance of diatom resting stages with patterns of sea-ice coverage. In this study, we quantified viable diatom resting stages in sediments collected during summer and autumn 2018 and explored their relationship to sea-ice extent during the previous winter and spring. Diatom assemblages were clearly dependent on the variable timing of the sea-ice retreat and accompanying light conditions. In areas where sea-ice retreated earlier, open-water species such as Chaetoceros spp. and Thalassiosira spp. were abundant. In contrast, proportional abundances of Attheya spp. and pennate diatom species that are commonly observed in sea-ice were higher in areas where diatoms experienced higher light levels and longer day length in/under the sea-ice. This study demonstrates that sea-ice dynamics are an important determinant of diatom species composition and distribution in the Pacific Arctic region.
  • Article
    The dawn of the BioGeoSCAPES Program: ocean metabolism and nutrient cycles on a changing planet
    (Oceanography Society, 2024-05-23) Saito, Mak A. ; Alexander, Harriet ; Benway, Heather M. ; Boyd, Philip W. ; Gledhill, Martha ; Kujawinski, Elizabeth B. ; Levine, Naomi M. ; Maheigan, Mai ; Marchetti, Adrian ; Obernosterer, Ingrid ; Santoro, Alyson E. ; Shi, Dalin ; Suzuki, Koji ; Tagliabue, Alessandro ; Twining, Benjamin S. ; Maldonado, Maria T.
    Biogeochemical cycles constitute Earth’s life support system and distinguish our planet from others in this solar system. Microorganisms are the primary drivers of these cycles. Understanding the controls on marine microbial dynamics and how microbes will respond to environmental change is essential for building and assessing model-based forecasts and generating robust projections of climate change impacts on ocean productivity and biogeochemical cycles. An international community effort has been underway to create a global-scale marine microbial biogeochemistry research program to tackle gaps in this understanding. The BioGeoSCAPES: Ocean Metabolism and Nutrient Cycles on a Changing Planet program will identify and quantify how marine microbes adjust to a changing climate and assess the consequences for global biogeochemical cycles. This article summarizes the ongoing efforts to launch BioGeoSCAPES.