Radiolarian assemblages in surface sediments along longitude 175°E in the Pacific Ocean

Kamikuri, Shin-ichi; Motoyama, Isao; Nishimura, Akira

doi:10.1016/j.marmicro.2008.07.005

Cited by 47 publications

(37 citation statements)

References 56 publications

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“…Tropical and subtropical radiolarian species in the North Pacific Ocean (Nigrini 1970;Lombari and Boden 1985;Yamauchi 1986;Motoyama and Nishimura 2005;Kamikuri et al 2008) and the Japan Sea (Itaki 2003;Motoyama et al submitted) are Kuroshio and Tsushima Current indicators. Nigrini (1970) reported distributions of 37 radiolarian species in 83 Holocene sediments widely collected from the North Pacific and classified into 6 recurrent groups which reflect surface circulation and upper water masses.…”

Section: Radiolariansmentioning

confidence: 99%

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Gallagher

Kitamura

Iryu

et al. 2015

Prog. in Earth and Planet. Sci.

159

121

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The Kuroshio Current is a major western boundary current controlled by the North Pacific Gyre. It brings warm subtropical waters from the Indo-Pacific Warm Pool to Japan exerting a major control on Asian climate. The Tsushima Current is a Kuroshio offshoot transporting warm water into the Japan Sea. Various proxies are used to determine the paleohistory of these currents. Sedimentological proxies such as reefs, bedforms, sediment source and sorting reveal paleocurrent strength and latitude. Proxies such as coral and mollusc assemblages reveal past shelfal current activity. Microfossil assemblages and organic/inorganic geochemical analyses determine paleo-sea surface temperature and salinity histories. Transportation of tropical palynomorphs and migrations of Indo-Pacific species to Japanese waters also reveal paleocurrent activity. The stratigraphic distribution of these proxies suggests the Kuroshio Current reached its present latitude (35°N) by~3 Ma when temperatures were 1 to 2°C lower than present. At this time a weak Tsushima Current broke through Tsushima Strait entering the Japan Sea. Similar oceanic conditions persisted until~2 Ma when crustal stretching deepened the Tsushima Strait allowing inflow during every interglacial. The onset of stronger interglacial/glacial cycles~1 Ma was associated with increased North Pacific Gyre and Kuroshio Current intensity. This triggered Ryukyu Reef expansion when reefs reached their present latitude (~31°N), thereafter the reef front advanced (~31°N) and retreated (~25°N) with each cycle. Foraminiferal proxy data suggests eastward deflection of the Kuroshio Current from its present path at 24°N into the Pacific Ocean due to East Taiwan Channel restriction during the Last Glacial Maximum. Subsequently Kuroshio flow resumed its present trajectory during the Holocene. Ocean modeling and geochemical proxies show that the Kuroshio Current path may have been similar during glacials and interglacials, however the glacial mode of this current remains controversial. Paleohistorical studies form important analogues for current behavior with future climate change, however, there are insufficient studies at present in the region that may be used for this purpose. Modeling of the response of the Kuroshio Current to future global warming reveals that current velocity may increase by up to 0.3 m/sec associated with a northward migration of the Kuroshio Extension.

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Section: Radiolariansmentioning

confidence: 99%

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Gallagher

Kitamura

Iryu

et al. 2015

Prog. in Earth and Planet. Sci.

159

121

View full text Add to dashboard Cite

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“…Spumellarian skeletons are well preserved in marine sediments worldwide and the species distribution is mainly inferred from sediment core studies (Lombari and Boden 1985 ;Kamikuri et al 2008 ;Boltovskoy et al 2010 ). The vertical and latitudinal distributions of Spumellaria have been well studied in the North Pacifi c (Matsuzaki et al 2014 ) (Fig.…”

Section: Environmental Distributionsmentioning

confidence: 99%

“…8.9 ). Sea surface temperature has been shown to drive relative abundance of polycystine assemblage in the Southern Ocean and in the North Pacifi c (Cortese and Abelmann 2002 ;Kamikuri et al 2008 ). Based on a data set of relative abundance in surface sediments, a transfer function equation is established and applied to the fossil records.…”

Section: Major Factors Controlling Polycystine Distributionsmentioning

confidence: 99%

Biology and Ecology of Radiolaria

Suzuki

Not

2015

Marine Protists

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Radiolaria are unicellular holoplanktonic protozoa with siliceous or strontium sulfate skeletons. Mainly studied by micropaleontologists because of their excellent fossil record, they are also key members of planktonic communities and play important roles in various oceanic ecosystems. This chapter presents an overview of the current knowledge on living Radiolaria (orders Acantharia, Collodaria, Nassellaria, Spumellaria and Taxopodia). Besides general considerations on Radiolaria as a whole, it focuses on the taxonomy, biology, and ecology of each radiolarian order. Finally this chapter provides insights on research perspectives to improve our knowledge of living radiolarians and their ecological role in marine ecosystems.

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“…Radiolarians are grouped according to their environmental preferences following Kamikuri et al (2008). Cold-water species, such as Stylodictya validispina and Stylochlamydium venustum, dominate the assemblages ( Fig.…”

Section: Radiolarian Paleoenvironmental Considerationsmentioning

confidence: 99%