Diatom Flora from Time-Series Sediment Trap in the Kuroshio Extension Region of the Northwestern Pacific

Author:

Park Joon Sang1,Kim Hyung Jeek2,Lee Kyun-Woo3ORCID,Ha Hyun Ju1,Kim Yun Jae3

Affiliation:

1. Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje 53201, Republic of Korea

2. Tropical & Subtropical Research Center, Korea Institute of Ocean Science & Technology, Jeju 63349, Republic of Korea

3. Marine Biotechnology & Bioresource Research Department, Korea Institute of Ocean Science & Technology, Busan 49111, Republic of Korea

Abstract

Precise identification of diatom species is fundamental to correctly interpreting their roles in the marine ecosystems; the documentation of species records with illustrations is therefore essential to guarantee ecological works and the continuous use of compositional data in future works. We document the diatom flora in the Kuroshio Extension (KE) area of the northwestern Pacific. Samples were collected by sediment trap deployment from November 2017 to August 2018 and identified using light microscopy and scanning electron microscopy. Eighty-two taxa belonging to 17 families and 38 genera were documented with representative references, morphological dimensions, brief diagnosis, distribution, and short taxonomic comments. All of the taxa were divided into three distribution patterns (cold, warm, and eurythermal taxa) based on the previous distribution records; each group may be transported by the Oyashio and Kuroshio Currents, respectively. The mixed occurrence of cold- and warm-water species indicates that the KE area is a crossroads for them. A preliminary checklist was compiled from previous studies, incorporating our records, and 206 diatom taxa occurred in the northeastern path of the Kuroshio Current. The diatom flora in the KE area will be used to understand the hydrology of the Kuroshio Current in future work.

Funder

Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries

Publisher

MDPI AG

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