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Millennial-scale planktic foraminifer faunal variability in the East China Sea during the past 40000 years (IMAGES MD012404 from the Okinawa Trough) ArchiMer
Chang, Yuan-pin; Wang, Wei-lung; Yokoyama, Yusuke; Matsuzaki, Hiroyuki; Kawahata, Hodaka; Chen, Min-te.
High resolution planktic foraminifer fauna assemblage data are used to reconstruct the millennial-scale sea surface temperature (SST) variability of the past 40000 years at an IMAGES core site (MD012404) in the Okinawa Trough in the East China Sea (ECS). The fauna assemblages in core MD012404 are dominated by five species - Globigerinoides ruber, Globigerina bulloides, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, and Globigerinita glutinata, which account for > 70% in relative abundance. Our Q-mode factor analysis decomposed the fauna abundance data into three factors, which indicate cold water mass, warm water mass, and possibly coastal water flow with low salinity in the ECS. The MD012404 fauna data show abrupt changes at similar to 16...
Tipo: Text Palavras-chave: Planktic foraminifer; Sea surface temperature; ITCZ; East China Sea; Okinawa Trough; IMAGES.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34818/33684.pdf
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Longitudinal differentiation among pelagic populations in a planktic foraminifer ArchiMer
Ujiie, Yurika; Asami, Takahiro; De Garidel-thoron, Thibault; Liu, Hui; Ishitani, Yoshiyuki; De Vargas, Colomban.
Evolutionary processes in marine plankton have been assumed to be dependent on the oceanic circulation system, which transports plankton between populations in marine surface waters. Gene flow facilitated by oceanic currents along longitudinal gradients may efficiently impede genetic differentiation of pelagic populations in the absence of confounding marine environmental effects. However, how responsible oceanic currents are for the geographic distribution and dispersal of plankton is poorly understood. We examined the phylogeography of the planktic foraminifer Pulleniatina obliquiloculata in the Indo-Pacific Warm Pool (IPWP) by using partial small subunit ribosomal DNA (SSU rDNA) sequences. We found longitudinal clines in the frequencies of three...
Tipo: Text Palavras-chave: Longitudinal gradient; Ocean current; Phylogeography; Planktic foraminifer.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00140/25109/23218.pdf
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