Distribution of calcareous nannoplankton near the Subtropical Convergence, south of Tasmania, Australia

Hiramatsu, Chikara; Deckker, Patrick De

doi:10.1071/mf9960707

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…3, e-g, k; type C sensu Findlay and Giraudeau (2000), plate 1, figs. 2 and 3; type K sensu Hiramatsu and DeDeckker (1996), fig. 2, c-d.…”

Section: Discussionmentioning

confidence: 99%

“…1996), while the type B is primarily found in the North Sea (van Bleijswijk et al. 1991) and the type B/C (referred to as type K by Hiramatsu and DeDeckker 1996, and type C by Findlay and Giraudeau 2000) has thus far only been found in the Southern Ocean (Findlay and Giraudeau 2000, Cubillos et al. 2007), the Kuroshio Current, east of Japan (Findlay and Giraudeau 2000, Hagino et al.…”

Section: Morphotaxonomy Of Five Emiliania Huxleyi Morphotypes Measumentioning

confidence: 99%

“…The geographic distribution of E. huxleyi morphotypes has also been investigated to identify the morphological and genetic variability within semidiscrete populations (van Bleijswijk et al 1991, Hagino et al 2005. The A morphotype is globally widespread and the most prevalent bloom-forming morphotype (Paasche et al 1996), while the type B is primarily found in the North Sea (van Bleijswijk et al 1991) and the type B ⁄ C (referred to as type K by Hiramatsu andDeDeckker 1996, andtype C by Findlay andGiraudeau 2000) has thus far only been found in the Southern Ocean (Findlay andGiraudeau 2000, Cubillos et al 2007), the Kuroshio Current, east of Japan (Findlay andGiraudeau 2000, Hagino et al 2005), and off the coast of Namibia (J. Henderiks, personal communication). Morphotype R (Reticulofenestra-like) is similar to type A, but with heavily calcified shield elements and the slits often closed.…”

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confidence: 99%

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Photosynthetic Pigment and Genetic Differences Between Two Southern Ocean Morphotypes of Emiliania Huxleyi (Haptophyta)1

Cook

Whittock

Wright

et al. 2011

Journal of Phycology

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The widespread coccolithophorid Emiliania huxleyi (Lohmann) W. W. Hay et H. Mohler plays a pivotal role in the carbon pump and is known to exhibit significant morphological, genetic, and physiological diversity. In this study, we compared photosynthetic pigments and morphology of triplicate strains of Southern Ocean types A and B/C. The two morphotypes differed in width of coccolith distal shield elements (0.11-0.24 μm, type A; 0.06-0.12 μm, type B/C) and morphology of distal shield central area (grill of curved rods in type A; thin plain plate in type B/C) and showed differences in carotenoid composition. The mean 19'-hexanoyloxyfucoxanthin (Hex):chl a ratio in type B/C was >1, whereas the type A ratio was <1. The Hex:fucoxanthin (fuc) ratio for type B/C was 11 times greater than that for type A, and the proportion of fuc in type A was 6 times higher than that in type B/C. The fuc derivative 4-keto-19'-hexanoyloxyfucoxanthin (4-keto-hex) was present in type A but undetected in B/C. DNA sequencing of tufA distinguished morphotypes A, B/C (indistinguishable from B), and R, while little variation was observed within morphotypes. Thirty single nucleotide polymorphisms were identified in the 710 bp tufA sequence, of which 10 alleles were unique to B/C and B morphotypes, seven alleles were unique to type A, and six alleles were unique to type R. We propose that the morphologically, physiologically, and genetically distinct Southern Ocean type B/C sensu Young et al. (2003) be classified as E. huxleyi var. aurorae var. nov. S. S. Cook et Hallegr.

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“…3, e-g, k; type C sensu Findlay and Giraudeau (2000), plate 1, figs. 2 and 3; type K sensu Hiramatsu and DeDeckker (1996), fig. 2, c-d.…”

Section: Discussionmentioning

confidence: 99%

Section: Morphotaxonomy Of Five Emiliania Huxleyi Morphotypes Measumentioning

confidence: 99%

mentioning

confidence: 99%

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Photosynthetic Pigment and Genetic Differences Between Two Southern Ocean Morphotypes of Emiliania Huxleyi (Haptophyta)1

Cook

Whittock

Wright

et al. 2011

Journal of Phycology

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“…For example, the physiological plasticity of coccolithophorids has been demonstrated in E. huxleyi , for which environmental conditions appear to determine metabolic responses in clonal isolates of the organism [ Paasche et al , 1996]. Three different morphotypes of E. huxleyi have been identified [ Hiramatsu and De Deckker , 1996]; there is temperature‐dependent growth rate in E. huxleyi , and serological affinity [see Wood and Leatham , 1992]. Additionally, certain physiological features are characteristic of particular ecotypes or genotypes [ Malin et al , 1992; Wolfe et al , 1994; Findlay and Giraudeau , 2000].…”

Section: Discussionmentioning

confidence: 99%

Representing key phytoplankton functional groups in ocean carbon cycle models: Coccolithophorids

Iglesias‐Rodríguez¹,

Brown

Doney

et al. 2002

Global Biogeochemical Cycles

266

235

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[1] Carbonates are the largest reservoirs of carbon on Earth. From mid-Mesozoic time, the biologically catalyzed precipitation of calcium carbonates by pelagic phytoplankton has been primarily due to the production of calcite by coccolithophorids. In this paper we address the physical and chemical processes that select for coccolithophorid blooms detected in Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color imagery. Our primary goal is to develop both diagnostic and prognostic models that represent the spatial and temporal dynamics of coccolithophorid blooms in order to improve our knowledge of the role of these organisms in mediating fluxes of carbon between the ocean, the atmosphere, and the lithosphere. On the basis of monthly composite images of classified coccolithophorid blooms and global climatological maps of physical variables and nutrient fields, we developed a probability density function that accounts for the physical chemical variables that predict the spatiotemporal distribution of coccolithophorids in the world oceans. Our analysis revealed that areas with sea surface temperatures (SST) between 3°and 15°C, a critical irradiance between 25 and 150 mmol quanta m À2 s À1 , and decreasing nitrate concentrations (DN/Dt < 0) are selective for upper ocean large-scale coccolithophorid blooms. While these conditions favor both Northern and Southern Hemisphere blooms of the most abundant coccolithophorid in the modern oceans, Emiliania huxleyi, the Northern and Southern Hemisphere populations of this organism are genetically distinct. Applying amplified fragment length polymorphism as a marker of genetic diversity, we identified two major taxonomic clades of E. huxleyi; one is associated with the Northern Hemisphere blooms, while the other is found in the Southern Hemisphere. We suggest a rule of ''universal distribution and local selection'': that is, coccolithophorids can be considered cosmopolitan taxa, but their genetic plasticity provides physiological accommodation to local environmental selection pressure. Sea surface temperature, critical irradiance, and DN/Dt were predicted for the years 2060-2070 using the NCAR Community Climate System Model to generate future monthly probability distributions of coccolithophorids based upon the relationships observed between the environmental variables and coccolithophorid blooms in modern oceans. Our projected probability distribution analysis suggests that in the North Atlantic, the largest habitat for coccolithophorids on Earth, the areal extent of blooms will decrease by up to 50% by the middle of this century. We discuss how the magnitude of carbon fluxes may be affected by the evolutionary success of coccolithophorids in future climate scenarios.

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“…This group has been a major producer of calcite in the open ocean since the late Jurassic (Hay 2004). These algae have gained increased attention as they play an important role in the global carbon cycle (e.g., Hiramatsu and Deckker 1997;Baumann et al 2000) and possibly are also susceptible to ocean acidification as are other calcifiers (e.g., Doney et al 2009;Beaufort et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Species composition of extant coccolithophores including twenty six new records from the southwest Pacific near New Zealand

Chang

Northcote

2016

Mar Biodivers Rec

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Background: Coccolithophores are one of the major components of marine phytoplankton and also one of the most prominent members of haptophyte algae. Studies of the extant coccolithophores started more than half a century ago in New Zealand waters, and with two exceptions, were limited to only a few relatively small areas close to shore. In this study the diversity of these 'calcium carbonate scale-producers' were updated from specimens collected in oceanic waters around the wider region of New Zealand. Methods: Water samples collected from 156 stations on 10 voyages between 2009 and 2011 were filtered through Nuclepore polycarbonate membrane filters. Coccolithophores retained on these filters were identified using scanning electron microscopy. Results: A total of 46 extant coccolithophore taxa were identified from 160 samples collected around New Zealand. The total number of coccolithophore taxa identified was greatest to the east (46), intermediate to the west (15) and least to the northeast and south (4 each) of New Zealand. These coccolithophores were classified into seven families in the four orders, with three families in incertae sedis, and one in a nannolith family. Forty two taxa were heterococcolithophores and four were holococcolithophopres. Conclusion: Approximately 57 % of the extant coccolithophores recorded were first-time records for the region. Even though Syracosphaera taxa generally occurred at low frequencies, they were the largest group and made up c. 31 % of all extant coccolithophores recorded in this study. Our findings provide updated information on the species composition and biogeography of coccolithophores in the southwest Pacific near New Zealand.

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Distribution of calcareous nannoplankton near the Subtropical Convergence, south of Tasmania, Australia

Cited by 21 publications

References 8 publications

Photosynthetic Pigment and Genetic Differences Between Two Southern Ocean Morphotypes of Emiliania Huxleyi (Haptophyta)1

Photosynthetic Pigment and Genetic Differences Between Two Southern Ocean Morphotypes of Emiliania Huxleyi (Haptophyta)1

Representing key phytoplankton functional groups in ocean carbon cycle models: Coccolithophorids

Species composition of extant coccolithophores including twenty six new records from the southwest Pacific near New Zealand

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