Pseudo-cryptic speciation in Braarudosphaera bigelowii (Gran and Braarud) Deflandre

Hagino, K.; Takano, Yoshihito; Horiguchi, Takeo

doi:10.1016/j.marmicro.2009.06.001

Cited by 27 publications

(50 citation statements)

References 33 publications

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“…Stanley et al (2005), on the other hand, reported an increase in the growth rates of three coccolithophorid species ( C. neohelis, P. carterae and O. neopolitana) by lowering the Mg/Ca ratio from ambient (5.2) to Cretaceous (%1) value, either by elevating [Ca 2+ ] or decreasing [Mg 2+ ]. Especially, the latter two species belong to different phylogenetic clades based on small subunit rDNA sequences (Hagino et al, 2009) and are capable of displaying contrasting physiological responses compared to the species tested in the current study.…”

Section: Growth Ratementioning

confidence: 91%

Response of the coccolithophores Emiliania huxleyi and Coccolithus braarudii to changing seawater Mg2+ and Ca2+ concentrations: Mg/Ca, Sr/Ca ratios and δ44/40Ca, δ26/24Mg of coccolith calcite

Müller

Kısakürek

Buhl

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Growth Ratementioning

confidence: 91%

Response of the coccolithophores Emiliania huxleyi and Coccolithus braarudii to changing seawater Mg2+ and Ca2+ concentrations: Mg/Ca, Sr/Ca ratios and δ44/40Ca, δ26/24Mg of coccolith calcite

Müller

Kısakürek

Buhl

et al. 2011

Geochimica et Cosmochimica Acta

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“…Amato and Montresor 2008;Goodman et al 2009;Hagino et al 2009;Murillo et al 2009;Ragionieri et al 2009;Verbruggen et al 2007). One natural explanation is that many cryptic species are morphologically rather simple (Bickford et al 2007;Stuart et al 2006), as is the case for most fungi.…”

Section: Cryptic Diversitymentioning

confidence: 99%

Lactarius volemus sensu lato (Russulales) from northern Thailand: morphological and phylogenetic species concepts explored

et al. 2010

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Lactarius volemus (Fr.: Fr.) Fr. is a well known and morphologically easily recognizable milkcap of the Northern hemisphere, forming ectomycorrhiza with both deciduous and coniferous trees. It was originally described from Europe, but is also reported in other continents. Although it is characterized by several unique macro- and micromorphological features, substantial variation in colour, lamellae spacing and changing and staining of the latex has been recorded and it is therefore considered as a putatively unresolved species complex. This study explores the concordance between morphological and phylogenetic species concepts within L. volemus sensu lato of northern Thailand, combining a critical morphological scrutiny with a multiple gene genealogy based on LSU, ITS and rpb2 nuclear sequences. Twelve strongly supported monophyletic clades and six terminal branches are discernable in all phylogenetic trees and represent 18 phylogenetic species. Six of the monophyletic clades can be morphologically distinguished and are described as new species: L. acicularis, L. crocatus, L. distantifolius, L. longipilus, L. pinguis and L. vitellinus. Five other clades also show some morphological differences, but these are too subtle and do not allow for a clear-cut species delimitation without the corroboration of molecular data. Lactarius volemus sensu lato of northern Thailand is therefore still considered as a partially cryptic species complex. Pleurolamprocystidia, pileipellis hairs and to a lesser degree also pileus colour are important diagnostic characteristics. Spore morphology, latex discoloration and pileus surface texture are less useful as diagnostic features. Whether this rich diversity is the result of in situ Pleistocene survival or post-glacial expansion and subsequent radiation, has yet to be revealed

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“…Indeed, nano secondary ion mass spectrometry demonstrated that the symbiont gave fixed nitrogen to the host and obtained organic carbon in return (Thompson et al, 2012). The 18S rDNA prymnesiophyte sequence, identified by single cell analysis (Thompson et al, 2012), was identical to an environmental sequence from the South Pacific (Shi et al, 2009) and related (98.2%) to Braarudosphaera bigelowii, a coastal nanoplanktonic coccolithophore (Hagino et al, 2009). Later, endosymbiotic UCYN-A was also discovered in B. bigelowii by transmission electron microscopic observations (Hagino et al, 2013).…”

Section: Introductionmentioning

confidence: 98%

Global distribution and vertical patterns of a prymnesiophyte–cyanobacteria obligate symbiosis

et al. 2015

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A marine symbiosis has been recently discovered between prymnesiophyte species and the unicellular diazotrophic cyanobacterium UCYN-A. At least two different UCYN-A phylotypes exist, the clade UCYN-A1 in symbiosis with an uncultured small prymnesiophyte and the clade UCYN-A2 in symbiosis with the larger Braarudosphaera bigelowii. We targeted the prymnesiophyte-UCYN-A1 symbiosis by double CARD-FISH (catalyzed reporter deposition-fluorescence in situ hybridization) and analyzed its abundance in surface samples from the MALASPINA circumnavigation expedition. Our use of a specific probe for the prymnesiophyte partner allowed us to verify that this algal species virtually always carried the UCYN-A symbiont, indicating that the association was also obligate for the host. The prymnesiophyte-UCYN-A1 symbiosis was detected in all ocean basins, displaying a patchy distribution with abundances (up to 500 cells ml − 1 ) that could vary orders of magnitude. Additional vertical profiles taken at the NE Atlantic showed that this symbiosis occupied the upper water column and disappeared towards the Deep Chlorophyll Maximum, where the biomass of the prymnesiophyte assemblage peaked. Moreover, sequences of both prymnesiophyte partners were searched within a large 18S rDNA metabarcoding data set from the Tara-Oceans expedition around the world. This sequence-based analysis supported the patchy distribution of the UCYN-A1 host observed by CARD-FISH and highlighted an unexpected homogeneous distribution (at low relative abundance) of B. bigelowii in the open ocean. Our results demonstrate that partners are always in symbiosis in nature and show contrasted ecological patterns of the two related lineages.

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Pseudo-cryptic speciation in Braarudosphaera bigelowii (Gran and Braarud) Deflandre

Cited by 27 publications

References 33 publications

Response of the coccolithophores Emiliania huxleyi and Coccolithus braarudii to changing seawater Mg2+ and Ca2+ concentrations: Mg/Ca, Sr/Ca ratios and δ44/40Ca, δ26/24Mg of coccolith calcite

Response of the coccolithophores Emiliania huxleyi and Coccolithus braarudii to changing seawater Mg2+ and Ca2+ concentrations: Mg/Ca, Sr/Ca ratios and δ44/40Ca, δ26/24Mg of coccolith calcite

Lactarius volemus sensu lato (Russulales) from northern Thailand: morphological and phylogenetic species concepts explored

Global distribution and vertical patterns of a prymnesiophyte–cyanobacteria obligate symbiosis

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