A taxonomic review of the genus Phaeocystis

Medlin, Linda K.; Zingone, Adriana

doi:10.1007/s10533-007-9087-1

Cited by 59 publications

(27 citation statements)

References 38 publications

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“…Overall, our results are consistent with previous studies showing that species of Phaeocystis occurring in polar and non-polar areas are distinct (Schoemann et al 2005, Decelle et al 2012. Few studies have reported blooms of P. jahnii and P. cordata, which may be due to their small size, or may indicate that they cannot form, or seldom form, colonies in the natural environment (Zingone et al 1999, Medlin & Zingone 2007. Molecular approaches appear to be useful tools for studying the distributions of P. jahnii and P. cordata.…”

Section: Discussionsupporting

confidence: 92%

Diversity and abundance of haptophytes in the East China Sea

Yang¹,

Chung²,

Gong³

et al. 2014

Aquat. Microb. Ecol.

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Haptophytes (Prymnesiophytes) are important members of eukaryotic phytoplankton and therefore influence carbon and sulfur cycles in the marine ecosystem. The objective of this study was to investigate the distribution and taxonomic composition of haptophytes in the East China Sea (ECS). Our sampling area covered the ECS continental shelf in the spring and summer of 2009. An abundance of haptophytes was revealed by fluorescent in situ hybridization with an 18S rRNA-specific probe. A haptophyte blooming event reaching 2.2 × 10 4 cells ml −1 was observed in the Yellow Sea Mixing Water in spring. Phylogenetic analysis of the 18S rRNA gene revealed that the majority of this bloom was composed of Phaeocystis sequences that affiliated with P. jahnii and P. cordata. In contrast, in summer the assemblage composition of haptophytes was dominated by Chrysochromulina, with a maximum abundance of 3.1 × 10 3 cells ml −1 occurring near the edge of the Changjiang Diluted Water. We also noted a relationship between larger size haptophytes and water eutrophication. The contribution of haptophytes to total nanoflagellate abundance at the ECS surface was 32% in spring and 12% in summer.KEY WORDS: Haptophyte · Phaeocystis · 18S rRNA gene Resale or republication not permitted without written consent of the publisher

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Section: Discussionsupporting

confidence: 92%

Diversity and abundance of haptophytes in the East China Sea

Yang¹,

Chung²,

Gong³

et al. 2014

Aquat. Microb. Ecol.

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“…Sequences most similar to P. jahnii have also been found in the Ross Sea by Gast et al (2004). It seems that the genus Phaeocystis is more diverse than presumed, which Medlin and Zingone (2007) also illustrated by reviewing the genetic variation of 22 isolates. Furthermore, it is possible that Phaeocystis has different ecotypes that are able to cope with a wide range of environmental conditions.…”

Section: Community Compositionmentioning

confidence: 82%

Protist community composition in the Pacific sector of the Southern Ocean during austral summer 2010

et al. 2013

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Knowledge about the protist diversity of the Pacific sector of the Southern Ocean is scarce. We tested the hypothesis that distinct protist community assemblages characterize large-scale water masses. Therefore, we determined the composition and biogeography of late summer protist assemblages along a transect from the coast of New Zealand to the eastern Ross Sea. We used state of the art molecular approaches, such as automated ribosomal intergenic spacer analysis and 454-pyrosequencing, combined with high-performance liquid chromatography pigment analysis to study the protist assemblage. We found distinct biogeographic patterns defined by the environmental conditions in the particular region. Different water masses harbored different microbial communities. In contrast to the Arctic Ocean, picoeukaryotes had minor importance throughout the investigated transect and showed very low contribution south of the Polar Front. Dinoflagellates, Syndiniales, and small stramenopiles were dominating the sequence assemblage in the Subantarctic Zone, whereas the relative abundance of diatoms increased southwards, in the Polar Frontal Zone and Antarctic Zone. South of the Polar Front, most sequences belonged to haptophytes. This study delivers a comprehensive and taxon detailed overview of the protist composition in the investigated area during the austral summer 2010.

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“…This is particularly true for taxa for which classification was previously controversial due to the lack of clear morphological criteria. Successful integration of morphological and molecular taxonomy has been demonstrated for many groups of marine flagellates, for example, for cryptomonads (Hoef-Emden & Melkonian, 2003;Cerino & Zingone, 2006, 2007 and prymnesiophytes (Edvardsen et al, 2000;Medlin & Zingone, 2007;Edvardsen et al, 2011). Nevertheless, attempts to achieve such a synthesis with raphidophytes have thus far been more problematic, mainly because of the lack of correspondence between morphological and molecular classifications.…”

Section: Discussionmentioning

confidence: 99%

Phylogeny and morphology of a Chattonella (Raphidophyceae) species from the Mediterranean Sea: what is C. subsalsa?

Klöpper

John

Zingone

et al. 2013

European Journal of Phycology

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We analysed the molecular and morphological features of strains of Chattonella subsalsa isolated from the western Adriatic coast (Mediterranean Sea), with the aim of confirming their classification and elucidating their phylogenetic positions within the Raphidophyceae. We sequenced parts of the ribosomal operon, including the small subunit (SSU), the internal transcribed spacer region (ITS) and the large subunit (LSU) of the rDNA. Additionally, we analysed sequences of the chloroplast-encoded subunit psaA of Photosystem I (PSI) and rbcL, encoding the large subunit of the Rubisco gene. For three phylogenetic markers (LSU, ITS, rbcL), the sequences of the strains from the Adriatic Sea were identical and for two markers (SSU, psaA) only minor differences occurred. All strains were sister to, but well separated from, sequences from isolates in culture collections and from GenBank, thus far classified as belonging to C. subsalsa. Light and electron microscopy provided evidence for morphological differences between a strain of C. subsalsa (CCMP217) from the Gulf of Mexico and the isolates from the Adriatic Sea. Differences concerned the shape and arrangement of chloroplasts and the presence of mucocysts and other surface microstructures, which were only observed in isolates from the Adriatic Sea. This is the first evidence for two different taxa classified as C. subsalsa, which are clearly separated on the basis of several genetic markers and also show morphological differences. As compared with strains assigned to C. subsalsa from the NCMA (formerly CCMP) culture collection, the Adriatic strains more closely match the original species description. This would imply that strain CCMP217 and other genetically similar strains should be described under a new species name. Nevertheless, given the high morphological plasticity of Chattonella species, the definition of the true C. subsalsa must be decided based on detailed morphological and molecular analysis of more strains from other geographical areas.

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A taxonomic review of the genus Phaeocystis

Cited by 59 publications

References 38 publications

Diversity and abundance of haptophytes in the East China Sea

Diversity and abundance of haptophytes in the East China Sea

Protist community composition in the Pacific sector of the Southern Ocean during austral summer 2010

Phylogeny and morphology of a Chattonella (Raphidophyceae) species from the Mediterranean Sea: what is C. subsalsa?

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