Modern shallow water radiolarians with photosynthetic microbiota in the western North Pacific

Zhang, Lanlan; Suzuki, Noritoshi; Nakamura, Yasuhide; Tuji, Akihiro

doi:10.1016/j.marmicro.2017.10.007

Cited by 33 publications

(28 citation statements)

References 31 publications

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“…As extant Tetrapyle spp. live in warm water and always bear algal symbionts at the subfamily level (e.g., Zhang et al 2018), shallow-warm waters were not flowing in these regions. Thus, warm water of the North Pacific probably did not flow into the Japan Sea via the northern and northernmost seaways, and the eastern and central Japan Sea seaways are the most plausible pathways for enabling the inflow of warm water into the Japan Sea from the North Pacific.…”

Section: Discussionmentioning

confidence: 99%

“…might also include morphotypes from different genera because for the Miocene, the taxonomy of both genera is poorly settled and accurate taxonomic study of both genera is required for this period. However, most of the extant taxa, which potentially belong to these two species groups, bear algal symbionts and inhabit warmer shallow waters (Zhang et al 2018). Therefore, this taxonomic concern does not affect our paleoceanographic reconstruction.…”

Section: Relative Abundance Of Abundant Speciesmentioning

confidence: 99%

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Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Matsuzaki

Itaki

Tada

et al. 2018

Prog Earth Planet Sci

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Previous studies showed that the evolution of the Japan Sea paleoceanography since the Miocene has been influenced by the regional tectonism (e.g., opening/closing of the connecting seaways) and regional/global climate. In the Japan Sea, Expedition 346 of the Integrated Ocean Drilling Program (IODP) retrieved core sediments dating back to the Miocene at two sites (U1425 and U1430). In this study, we reconstruct shallow-to-deep-water hydrography of the Japan Sea during the Mio-Pliocene based on radiolarian assemblages at Sites U1425 and U1430 considering the local tectonism and changes in global/regional climate. Our data suggest that glacioeustatic sea-level changes have probably had an influence on the local paleoceanography between 9.5 and 7.0 Ma. Indeed, warm water probably flowed from the North Pacific into the Japan Sea when sea level was high via shallow central and eastern seaways. In addition, the sill depth of the northern seaway was probably close to 1000 m between 9.5 and 7.8 Ma and had probably allowed inflow of oxygen minimum zone water from the North Pacific to the Japan Sea when sea level was high. In contrast, our data imply that Cycladophora nakasekoi, an endemic species to the Japan Sea, dominated between 9.5 and 7.3 Ma when sea level was low. Our data also suggest a progressive shoaling of the sill for the period since 7.8 Ma and that global climatic events such as such the late Miocene cooling (7.5-5.5 Ma) and the early Pliocene warmth have had a sustained influence on the Japan Sea. During the mid-Pliocene, a deep cooling of the subsurface to intermediate water of the Japan Sea likely occurred because species related to subarctic subsurface to intermediate waters were dominant between 5 and 3.8 Ma. The Northern Hemisphere Glaciation (ca. 3.0-2.7 Ma) and Mid-Pleistocene Transition (1.2-0.8 Ma) have both likely intensified the cooling of the Japan Sea.

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Section: Discussionmentioning

confidence: 99%

Section: Relative Abundance Of Abundant Speciesmentioning

confidence: 99%

Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Matsuzaki

Itaki

Tada

et al. 2018

Prog Earth Planet Sci

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“…The highest abundance of the T. circularis/fruticosa group (> 22%) was recorded during MIS 9 (300-337 ka). Recently, it has been proven that all species belonging to the Tetrapyle genus have algal symbionts and inhabit warm shallow water (Zhang et al 2018). In addition, this species group has been found in areas influenced by warm-water currents (e.g., the KC and its related branches), such as the northern ECS, Japan Sea, and Japan's Pacific coast (e.g., Lombari and Boden 1985;Itaki et al , 2007Itaki et al , 2010Motoyama and Nishimura 2005;Kamikuri et al 2008;Itaki 2009Itaki , 2016Boltovskoy et al 2010;Matsuzaki et al 2014aMatsuzaki et al , 2015aMatsuzaki et al , 2015bMatsuzaki et al , 2016; Botovskoy and Correa 2016; Matsuzaki and Itaki 2017).…”

Section: Relative Abundances Of Selected Speciesmentioning

confidence: 99%

“…Therefore, we assume that dissolution is not the main factor regulating radiolarian absolute abundances. In addition, most of the radiolarian species inhabiting shallow water in tropical to subtropical areas of the NW Pacific bear algal symbionts (Suzuki and Not 2015;Zhang et al 2018). This fact suggests that radiolarians contribute, in part, to primary ocean productivity, at least in warm areas (De Wever et al 2001;Suzuki and Not 2015;Zhang et al 2018).…”

Section: Evolution Of Local Shallow Water During Glacial Periodsmentioning

confidence: 99%

Paleoceanographic changes in the Northern East China Sea during the last 400 kyr as inferred from radiolarian assemblages (IODP Site U1429)

Matsuzaki

Itaki

Tada

2019

Prog Earth Planet Sci

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The East China Sea (ECS) is a shallow marginal sea that is sensitive to glacio-eustatic sea-level changes and is influenced by warm oligotrophic water of the Kuroshio Current (KC), the nutrient-rich Taiwan Warm Current, and freshwater discharges from rivers in southern China during the East Asian summer monsoon season. In this area, local paleoceanographic changes for times prior to 40 ka remain poorly studied because of high sediment accumulation rates on the seafloor. During Integrated Ocean Drilling Program Expedition 346, long sediment cores representing the last 400 kyr were retrieved from the northern part of the ECS (Site U1429). In these cores, radiolarians are abundant and well-preserved, thus using the ecological properties of radiolarians, we analyzed how glacio-eustatic sea-level variations have influenced the paleoceanography of the ECS over the last 400 kyr, with a focus on changes in water properties at intermediate depths. Additionally, the summer sea surface temperature (SST) and intermediate water temperature at about 500 m were quantified by means of data on selected radiolarian species. The KC influenced the shallow water at Site U1429 during each interglacial period over the last 400 kyr (marine isotope stages [MISs] 1, 5, 7, 9, and 11), causing a high summer SST (about 27°C), although inflow of the KC into the ECS was probably delayed until after the sea-level maximum of interglacial MIS 1 and MIS 5. During this lag time, ECS shelf water was the dominant influence on the system. During glacial periods (MISs 2-4, 6, and 10), our data suggest that coastal conditions prevailed, probably because of a sea-level drop of more than 90 m. At these times, the summer SST was colder, ca. 20°C. Changes in the relative abundance of Cycladophora davisiana indicate that the most significant changes in the bottom water occurred during MIS 6, when the bottom water likely became poorer in oxygen. An increase in the shallow-water primary productivity during MIS 7 and MIS 6 was probably the key factor causing the oxygen-poor conditions.

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“…With their pseudopodia, they actively capture prey, such as copepod nauplii or tintinnids, by adhesion (Sugiyama and Anderson, 1997). In addition to predation, many spumellarian species dwelling in the sunlit ocean harbour photosynthetic algal symbionts, mainly identified as dinoflagellates (Probert et al, 2014;Yuasa et al, 2016;Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

Sandín

Biard

Romac

et al. 2020

Preprint

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AbstractSpumellaria (Radiolaria, Rhizaria) are holoplanktonic amoeboid protists, ubiquitous and abundant in the global ocean. Their silicified skeleton preserves very well in sediments displaying an excellent fossil record, from the early middle Cambrian (ca. 509-521 Ma), extremely valuable for paleo-environmental reconstruction studies. Spumellaria are tedious to maintain in laboratory conditions preventing an accurate perception of their extant diversity and ecology in today’s oceans, most of which being inferred from sediment records. This study represents an integrated and comprehensive classification of Spumellaria based on the combination of ribosomal taxonomic marker genes (rDNA) and morphological characteristics. In contrast to established taxonomic knowledge, we demonstrate that symmetry of the skeleton takes more importance than internal structures at high taxonomic rank classification. Such reconsideration allows gathering different morphologies with concentric structure and a spherical or radial symmetry believed to belong to other Radiolaria orders from the fossil record, as for some Entactinaria families. Results obtained in this study suggest the existence of new Spumellaria diversity at early diverging positions, in which a non-bearing skeleton organism lives within shelled ones. Using fossil calibrated molecular clock we estimated the origin of Spumellaria in the middle Cambrian (ca. 515 Ma), in agreement with the appearance of the first radiolarian representatives in the fossil record. The morpho-molecular and evolutionary framework established herein allows a direct connection between living specimens and fossil morphologies from the Cambrian, bringing both a standpoint for future molecular environmental surveys and a better understanding for paleo-environmental reconstruction studies.

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Modern shallow water radiolarians with photosynthetic microbiota in the western North Pacific

Cited by 33 publications

References 31 publications

Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Paleoceanographic changes in the Northern East China Sea during the last 400 kyr as inferred from radiolarian assemblages (IODP Site U1429)

Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

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