MOTU table for field-collected samples

MOTU list for field-collected samples at the 97% similarity threshold, with information of number of sequence reads in each station, Blast result, and representative sequences. The taxonomic order determined by the naϊve Bayesian classifier implemented in mothur is also listed

Raw data of morphological analysis

Morphological analysis of field-collected samples. Numbers of individuals (Inds.) and total dry weight (DW) for all species identified from each sampling location. Numbers of individuals and DW are calibrated into unsplit (1/1) samples

Sequence file for classification

Sequence file for the naϊve Bayesian classifier implemented in mothu

Aligned LSU sequences of copepods

Aligned sequences of LSU D2 region registered in this study (GenBank accessions AB796399–AB796431 and AB820728–AB820803

MOTU table for field-collected samples (99% similarity)

MOTU list for field-collected samples at the 99% similarity threshold, with information of number of sequence reads in each station, and representative sequences

MOTU table for artificial community sample

MOTU list for artificial community sample (33 morphologically identified species) at the 97% threshold, with information of number of sequence reads, Blast result and representative sequence

Taxonomy file for classification

Taxonomy file for the naϊve Bayesian classifier implemented in mothu

MID tag information

MID tag used in this study. Each sample was differentiated by unique multiplex identifier (MID) adaptors in GS Titanium Rapid Library MID Adaptors Kit (Roche)

Southwest Intrusion of ¹³⁴Cs and ¹³⁷Cs Derived from the Fukushima Dai-ichi Nuclear Power Plant Accident in the Western North Pacific

Enormous quantities of radionuclides were released into the ocean via both atmospheric deposition and direct release as a result of the Fukushima Dai-ichi Nuclear Power Plant (FNPP) accident. This study discusses the southward dispersion of FNPP-derived radioactive cesium (Cs) in subsurface waters. The southernmost point where we found the FNPP-derived ¹³⁴Cs (1.5–6.8 Bq m^–3) was 18°N, 135°E, in September 2012. The potential density at the subsurface peaks of ¹³⁴Cs (100–500 m) and the increased water column inventories of ¹³⁷Cs between 0 and 500 m after the winter of 2011–2012 suggested that the main water mass containing FNPP-derived radioactive Cs was the North Pacific Subtropical Mode Water (NPSTMW), formed as a result of winter convection. We estimated the amount of ¹³⁴Cs in core waters of the western part of the NPSTMW to be 0.99 PBq (decay-corrected on 11 March 2011). This accounts for 9.0% of the ¹³⁴Cs released from the FNPP, with our estimation revealing that a considerable amount of FNPP-derived radioactive Cs has been transported to the subtropical region by the formation and circulation of the mode water