Kazuki Hoshina

Yamagata University

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Richard W. Jordan

Yamagata University

Shijun Jiang

Hainan University

Shao‐Yong Jiang

China University of Geosciences

Francesca Lozar

University of Turin

Giuliana Villa

University of Parma

Hisashi Narita

Hokkaido University

R. W. Jordan

Naomi Harada

Japan Agency for Marine-Earth Science and Technology

Yuki Uezato

Yamagata University

Yasu Wang

Hohai University

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Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Hohai University

Jinan University

Florida State University

University of Parma

Yamagata University

Hainan University

University of Jinan

International Ocean Discovery Program

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Parmales (Bolidophyceae) assemblages in the subarctic Pacific Ocean during the mid-1960s

Phycologia (2020)

Kazuki Hoshina Yuki Uezato Richard W. Jordan

A large collection of old membrane filters from the American cruises of the R/V Vema and R/V Robert D. Conrad has been recently curated and provides a unique opportunity to study microplankton distribution in the 1960s. Filters from the subarctic Pacific Ocean and Bering Sea collected in May–July 1964 and June–Aug 1966 were observed in detail for the first time using scanning electron microscopy, to investigate assemblages of Parmales (Bolidophyceae). These filters were dominated by Triparma columacea f. convexa and T. strigata, with maximum absolute abundances of total Parmales up to 11.0 × 103 cells ml−1 and average abundances often one or two orders of magnitude higher than those of more modern studies. In later studies, Tetraparma pelagica is often cited as the dominant taxon, but it was less important in the 1960s. Since temperature is an important factor in controlling Parmales growth, this shift from high to low absolute abundance, and from the dominance of T. columacea f. convexa/T. strigata to Te. pelagica, could be related to a major climate shift in the late 1970s, and to the dramatic decrease in sea-ice cover and changes in plankton composition in the subarctic Pacific Ocean and Bering Sea.

Subarctic climate

Dominance (genetics)

10.1080/00318884.2020.1845046

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Eocene calcareous nannofossils from southern Tibet and their paleoceanographic implications for the closure of the eastern Tethys Ocean

AGU Fall Meeting Abstracts (2018)

R. W. Jordan Kazuki Hoshina Shao‐Yong Jiang

Closure (psychology)

Paleoclimatology

Tethys Ocean

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Triparma laevis f. marchantii f. nov. (Bolidophyceae) from the Southern Ocean, and comparison with other infraspecific taxa of T. laevis

Phycologia (2021)

Kazuki Hoshina Hisashi Narita Naomi Harada Richard W. Jordan

A form of Triparma laevis (Parmales, Bolidophyceae), not formally described yet, has been reported in Southern Ocean phytoplankton surveys for more than 30 years. A re-examination of some filtered seawater samples collected off the Antarctic Peninsula in the 1960s by the USNS Eltanin provided an opportunity to make detailed morphological observations. The new taxon, Triparma laevis f. marchantii f. nov., is morphologically very similar to T. laevis f. inornata from the subarctic Pacific, but differs in having a C-shaped ridge (rather than a straight one) in the centre of the shield and ventral plates, and a more rounded Y-shaped ridge on the dorsal plate. The other infraspecific taxa of T. laevis have distinct features lacking in T. laevis f. marchantii. The new taxon was sporadically the most abundant Parmales near the Antarctic Peninsula, but lower in abundance in other areas around Antarctica.

Peninsula

10.1080/00318884.2021.1883365

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Eocene calcareous nannofossils from southern Tibet: Paleoceanographic implications for the closure of the eastern Tethys Ocean

Marine Micropaleontology (2021)

Kazuki Hoshina Yasu Wang Shijun Jiang Francesca Lozar Davide Persico

Tethys Ocean

10.1016/j.marmicro.2021.102031

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Citations (6)