# 孝三 高橋's scientific contributions

## Publications (22)

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Diatom sinking fluxes at Sites MT3-MT7 in the western Equatorial Pacific in 1999-2002 were studied in order to decipher the ecological relationships between the diatom fluxes and environmental conditions such as water temperature and salinity. As a supplement for those studies, this paper contains the compiled data tables of diatom fluxes at Sites...
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We obtained three different types of samples from the central Arctic Ocean during the IODP Arctic Coring Expedition (ACEX) 302, which took place during summer 2004: they are (1) sea water, (2) sea-ice, and (3) diatom mat samples. A total of 227 specimens of pollen and spores as well as 52 pollen fragments were found in the samples. Dominant pollen...
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Samples for living marine phytoplankton Distephanus medianoctisol (Silicoflagellata with seven-sided basal ring) were obtained from the central Arctic Ocean during Integrated Ocean Drilling Program (IODP) Arctic Coring Expedition (ACEX) 302 which took place during summer 2004. Biometric and statistical analyses were performed on three different sam...
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Geochemical analyses of biogenic opal, total organic carbon (TOC), total sulfur (TS), and stable sulfur isotopic composition were conducted on the middle Eocene section of the ACEX cores obtained by IODP Expedition 302. The analyzed %TS contents were high in all the examined intervals, indicating sufficient sea water was present in the deep layer o...
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A nine year-long study on planktonic foraminifer fluxes was conducted in the Bering Sea (Station AB) and the central subarctic Pacific (Station SA). Mathematical analyses were carried out in order to decipher the consequences of temporal variation of foraminifer fluxes and their faunal assemblages with the oceanographic variability. As a result of...
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The vertical distribution of radiolarians was investigated by using plankton nets with 63 $\mu$m mesh in the central subarctic Pacific (Station OS06-SA) from the surface down to 3000 m depth, which were divided into fifteen sample layers. These samples were obtained in June 2006. Radiolarian standing stocks were high in the 0-250 m interval, and...
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The one hundred seventy two photomicrographs for major diatoms and siliceous flagellates in the pelagic northwestern subarctic Pacific are presented here as supplemental information for our previous publication on diatom and silicoflagellate flux studies at Stations 50N, KNOT, and 40N in the subarctic Pacific. As the siliceous flagellates, silicofl...
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SEM and TEM observations of up to x100,000 magnification were performed on the skeletons of phaeodarian Radiolaria mainly acquired by sediment traps. In addition for the sake of comparison, fresh plankton tow specimens were also observed as well as fossil phaeodarians from sediments. The presence of a variety of microstructures is apparent dependin...
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The Seventeenth International Diatom Symposium : Ottawa, Canada, 25th - 31st August 2002 : edited for the International Society for Diatom Research by Michel Poulin Based on quantitative analyses of fossil diatom assemblages in four Piston Cores, the paleoceanographic changes during the last 340 kyr in the southern Bering Sea and western subarctic...
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Alaska Sea Grant College Program report ; no. 99-03 : Chapter 16 A time-series sediment trap experiment was conducted at 3,200 m in the Bering Sea Basin (53°30′N, 177°00′W; 3,788 m) during 1991 and 1992 to determine seasonal variation in the processes of biological production in the surface water of the Bering Sea. The seasonal pattern of downward...
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Alaska Sea Grant College Program report ; no. 99-03 : Chapter 18 The process of efficient biological pumping with high biological productivity was determined for the Bering Sea by employing a long-term time-series sediment trap deployed during 1990-1995. The present Bering Sea is an effective atmospheric CO2 sink with significant drawdown of the CO...
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A study of modem pelagic subarctic Pacific phytoplankton has revealed the presence of three distinct species of Proboscia Sundstrom, including the type species P. alata and two new species with historical complications, P. subarctica (= Rhizosolenia alata f. curvirostris Gran) is markedly different in proboscis and valve morphology from the type sp...
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v. 130. Ontong Java Plateau Among the five sites drilled during Ocean Drilling Program Leg 130, two deep holes (8O3D and 807C) penetrated Cretaceous sediments overlying the basaltic pillows, flows, and possibly basement rocks. Abundant, poorly preserved radiolarians with limited diversity were recovered from a few horizons within the sediments prox...
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Edited by Susumu Honjo Radiolarians setting through the oceanic water column were recovered from three stations (western tropical Atlantic, Station E; central tropical Pacific, Station Pi; and Panama Basin, Station PB) using PARFL UX sediment traps in moored arrays at several depths. The taxonomic diversity of the radiolarian assemblages in the sed...
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v. 116. Distal Bengal Fan Cores recovered from three sites of Leg 116 were studied for radiolarians. Generally, radiolarians were absent from most samples prepared for examination. Moderate to well-preserved radiolarian assemblages are found only in the uppermost one or two cores that were the focus of this study. All of the radiolarian assemblages...
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The Seventeenth International Diatom Symposium : Ottawa, Canada, 25th - 31st August 2002 : edited for the International Society for Diatom Research by Michel Poulin The central and western equatorial Pacific is characterized by the Western Pacific Warm Pool (WPWP). The behavior of the WPWP has a significant influence on global climate changes such...
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Edited by Susumu Honjo Vertical fluxes of silicoflagellate skeletons were measured in meso- and bathypelagic zones at four P ARFL UX sediment trap stations located in the Pacific and Atlantic oceans. The average flux measured at several depths ranged from 35 X irf skeletonsjm2/day at the Pacific gyre (PI) station to 424 X irf skeletonsjm2/day at th...

## Citations

... 2a, f, 3b). The biometry of S. medianoctisol, notably the spine 261 length has been proposed as an indicator to discriminate sea ice and seawater habitats in the 262 central Arctic(Tsutsui and Takahashi, 2009). However, this morphological parameter was not 263 measured in this study. ...
... The latter might have caused a climatic isolation of the Bering Sea, which would explain why the marginal sea was sensitive to atmospheric teleconnections with the N-Atlantic throughout the entire deglaciation. Unimak Pass opened between 12 and 11 ka B.P. as inferred from fractional abundances of diatoms which point to increased inflow of AS-waters into the southeastern Bering Sea (site 51-JPC, near Unimak Pass; Figure 1) at that time [Katsuki et al., 2004; Caissie et al., 2010]. This timing is congruent with the beginning deviation of SST TEXL86 and GOA records and hence with the interruption of the climatic linkage between the eastern and western subarctic N-Pacific (Figure 4). ...
... Constituents of organic and inorganic elements and compounds have also been of interest to many of us. The works on amino acids and hexosamine were represented by Hashimoto et al. (1997 Hashimoto et al. ( , 1998) and Maita et al. (1996 Maita et al. ( , 1999). The results on rare earth elements were published by Akagi et al. (2011). ...
... In contrast, the open marine domain of the Bering Sea is regarded as a High-Nutrient-Low-Chlorophyll (HNLC) region (Banse and English, 1999;Leblanc et al., 2005;Tyrrell et al., 2005;Aguilar-Islas et al., 2007;Sambrotto et al., 2008;Brown et al., 2011). Diatoms such as Neodenticula seminae represent the dominant primary producers in the Bering Sea and contribute to a large flux of biogenic opal to Bering Sea sediments (Takahashi, 1999, 2005, Takahashi et al., 2002. ...
... P. gracilipes (Fig. 4F) and L. setosa (Fig. 4G) show a distribution pattern that is parallel to those of RAR and DI (Fig. 3C-D). Accordingly, both species are directly related with increased primary productivity associated with increased influence of the warm NAC and water column water mixing (Swanberg and Eide, 1992;Takahashi, 1997) In the same sense, occurrence of shallow water (upper 200 m) and temperate conditions species P. clevei (= P. pylonium), S. glacialis/ resurgens group, L. buetchslii, S. venustum, S. glacialis/resurgens group, L. minor, Botryostrobus auritus/australis group, A. medianum, Stylodictya validispina (McMillen and Casey, 1978;Samtleben et al., 1995;Boltovskoy et al., 1996;Hass et al., 2001;Matul et al., 2002;Hays and Morley, 2003;Lüer, 2003;Okazaki et al., 2004;Abelmann and Nimmergut, 2005) during interglacial periods (MIS 31,29,27,25,21) would indicate a northward position of the AF and stronger transport of the NAC, which brings warm waters to high latitudes and originates the high productivity conditions in the area of Site U1314 (Goll and Bjørklund, 1971;Matul, 1989bMatul, ,1994aBjørklund et al., 1998;Matul and Yushina, 1999;Hatakeda and Bjørklund, 2009). A similar response is shown by Druppatractus variabilis (=Druppratractus cf. ...
... Fossil species are commonly found in high latitudes of the Northern and Southern Hemisphere, in Subarctic and Antarctic waters, whilst extant Proboscia spp. SundStröm have a worldwide ocean distribution Takahashi et al., 1994). Proboscia barboi is an extinct species, found in the mid-to highlatitudes of the North Pacific and North Atlantic Oceans but also in Southern high latitudes, as reported in . ...
... C A Specimen abundance: AA = >20, A = 7-20, C = 3-6, R = 1-2. Species also classified as COS (cosmopolitan), and/or occurring in GVS (Great Valley sequence), or AUS (Western Australia).-Effing, 1980); DSDP Leg 32 (Foreman, 1975); DSDP Leg 62 (Schaaf, 1981); ODP Leg 130 (Takahashi and Ling, 1993). ...
... Identification was conducted primarily following the radiolarian monographs of Zhang and Suzuki (2017) and , as they summarized the taxonomy of the Radiolaria, especially Holocene pylonioid radiolarians, and the radiolarian monographs of offshore China (Chen and Tan, 1996;Tan, 1998;Tan and Su, 2003). We also followed two other integrated works (Boltovskoy, 1998;Takahashi, 1991) and an additional online database of fossil and recent radiolarians available at www. radiolaria.org. To reduce the taxonomic ambiguity induced by confusing morphological identification, some species were combined as follows. ...
... Furthermore, S. speculum was found abundant in the Bering Sea (>60% in 278 sediment; Poelchau, 1976; >80% in sediment trap; Onodera and Takahashi did not show a clear seasonal variability (Fig. 2g). This species has also been found in the 305 subarctic (Takahashi, 1987) and tropical Pacific (Takahashi, 1991) melting season (Fig. 2g). Therefore, given its wide distribution, A. pentasterias is unlikely to 312 be an indicator of cold conditions. ...
... The phaeodarian cell body is composed mainly of a siliceous skeleton (scleracoma) and internal soft parts (malacoma). The phaeodarian siliceous skeleton contains no organic matter within itself (Takahashi et al., 1983;Takahashi & Hurd, 2007). The malacoma contains the phaeodium and protoplasm such as the central capsule and ectoplasm (Nakamura & Suzuki, 2015). ...