Evidence from partial large-subunit (LSU) rDNA sequencing has been combined with ultrastructure, including details of the flagellar apparatus, in a number phototrophic dinoflagellates, aim trying to solve some most pressing taxonomic problems and contribute an improved understanding phylogeny within group. Special attention paid unarmoured (naked) genera, many which were described during 1800s or early 1900s whose taxonomy is artificial misleading. This particularly unsatisfactory because...

Abstract In order to elucidate the phylogeny and evolutionary history of Bacillariaceae we conducted a phylogenetic analysis 42 species (sequences were determined from more than two strains many Pseudo-nitzschia species) based on first 872 base pairs nuclear-encoded large subunit (LSU) rDNA, which include some most variable domains. Four araphid genera used as outgroup in maximum likelihood, parsimony distance analyses. The inferences revealed monophyletic (bootstrap support ≥90%). A clade...

An undescribed species of the dinoflagellate genus Karlodinium J. Larsen (viz. K. armiger sp. nov.) is described from Alfacs Bay (Spain), using light and electron microscopy, pigment composition, partial large subunit (LSU) rDNA sequence. The new differs type ( micrum (Leadbeater et Dodge) Larsen) by lacking rows amphiesmal plugs, a feature presently considered to be characteristic . In , an outer membrane underlain complex system cisternae vacuoles. profile revealed presence chlorophylls c...

Light and electron microscopy, nuclear‐encoded LSU rDNA sequences, pigment analyses were performed on five geographically separate isolates of Gymnodinium mikimotoi. The morphological variation between the equals that found within isolates. sequences nearly identical in all isolates, molecular using maximum likelihood, parsimony, neighbor joining showed geographical as an unresolved clade. Based available data it is concluded European formerly identified Gyrodinium aureolum , cf. or...

ABSTRACT Nearly complete ribulose‐1,5‐bisphosphate carboxylase/ oxygenase (rbcL)sequences from 27 taxa of heterokont algae were determined and combined with rbcL sequences obtained GenBank for four other three red algae. The phylogeny the morphologically diverse haterokont was inferred an unambiguously aligned data matrix using as root, Significantly higher levels mutational saturation in third codon positions found when plotting pair‐wise substitutions without corrections multiple at same...

MEPS Marine Ecology Progress Series Contact the journal Facebook (Twitter) RSS Mailing List Receive regular lists of newly published articles via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 416:79-91 (2010) - DOI: https://doi.org/10.3354/meps08780 Effect lowered pH on marine phytoplankton growth rates Terje Berge1,*, Niels Daugbjerg1, Bettina Balling Andersen2, Per Juel Hansen2 1Section for Evolution and Aquatic Organisms. Department Biology, University Copenhagen, Øster...

SUMMARY The well known freshwater dinoflagellate Woloszynskia pseudopalustris is transferred to the new genus Biecheleria , based on very unusual structure of eyespot (comprising a stack cisternae), apical apparatus single elongate amphiesma vesicle, resting cyst, and molecular data. phylogenetically related Symbiodinium Polarella family Suessiaceae. This family, which extends back Jurassic, redefined with (Type E sensu Moestrup Daugbjerg) as diagnostic features, unknown elsewhere in...

Harmful blooms formed by planktonic microalgae (HABs) in both freshwater and coastal waters regularly lead to severe mortalities of fish invertebrates causing substantial economic losses marine products worldwide. The mixotrophic haptophyte Prymnesium parvum is one the most important associated with kills. Here 26 strains P. a wide geographical distribution were screened for production prymnesins, suspected causative allelochemical toxins. All investigated produced indicating that toxins...

Using the large subunit of RuBisCo (rbcL) sequences from cyanobacteria, proteobacteria, and diverse groups algae green plants, we evaluated plastid relationship between haptophytes heterokont algae. The rbcL were determined three taxa (Bumilleriopsis filiformis, Pelagomonas calceolata, Pseudopedinella elastica) added to 25 published obtain a data set comprising 1,434 unambiguously aligned sites (approximately 98% total gene). Higher levels mutational saturation in third codon positions...

Members of Amphidinium Claparède and Lachmann constitute a major part sand‐dwelling benthic dinoflagellates worldwide. The genus is traditionally defined by its small epicone size, not exceeding one third the total cell length. It has long been suspected that this functional definition does reflect phylogeny, yet problem identifying type species A. operculatum closely related until now hindered attempts to redefine genus. In study 12 were examined using phylogenetic analyses based on...

We examined a free‐living Symbiodinium species by light and electron microscopy nuclear‐encoded partial LSU rDNA sequence data. The strain was isolated from net plankton sample collected in near‐shore waters at Tenerife, the Canary Islands. Comparing thecal plate tabulation of to that S. microadriaticum Freud., it became clear few but significant differences could be noted. isolate possessed two rather than three antapical plates, six seven eight postcingular finally four five apical plates....

Marine epibenthic dinoflagellates have been collected from macroalgae, dead corals, seagrasses and sand in Malaysia identified using light microscopy, including epifluorescence scanning electron microscopy. Examination of 62 samples revealed that has rich diversity benthic dinoflagellates, with 24 species representing 9 genera. Of these species, 8 were shown to be potentially toxic the Anemia bioassay test i.e. Prorocentrum arenarium, P. lima, concavum, cf. faustiae, Gambierdiscus pacificus,...

Amphidinium operculatum Claparède et Lachmann, the type species of dinoflagellate genus , has long had an uncertain identity. It been considered to be either difficult distinguish from other similar or a morphologically variable itself. This led hypothesis that A. represents “species complex.” Recently, problem distinguishing become particularly acute, because several have found produce bioactive compounds potential interest pharmaceutical industry. In this study, we cultured and examined...

Abstract The green form of ‘Glenodinium sanguineum Marchesoni’ sensu Baldi was investigated in detail by light microscopy, scanning electron transmission microscopy and analysis the SSU- LSU rDNA genes. These data demonstrated it to be different from red ‘G. sanguineum’ (now Tovellia sanguinea) represent a new species, Baldinia anauniensis gen. et sp. nov. It lacked thecal plates an apical groove, characterised presence peculiar lamellar body similar that described certain dinoflagellates...

Abstract Using ultrastructure and nuclear-encoded large subunit (LSU) rDNA sequences, the woloszynskioid dinoflagellates have been shown recently to form a polyphyletic assemblage. The first group comprises family Tovelliaceae, with genera Tovellia Jadwigia. present manuscript describes second group, comprising Borghiella dodgei gen. et sp. nov. from Italian Alps. new genus differs in number of ultrastructural features, which most important are structure eyespot (type B sensu Moestrup &...

:Gymnodinium fissum was described by Levander in 1894 from the Baltic Sea near Helsinki, and we argue, on basis of morphological molecular studies material type locality, cultures Åland islands, Puerto Rico, Portugal United States identified as Gyrodinium instriatum, Gymnodinium uncatenum sp., that all these taxa are conspecific. They morphologically genetically distinct here Levanderina fissa gen. & comb. nov. This species also includes pavillardii. observed chloroplasts cell some occasions...

Empirical evidence of the cost producing toxic compounds in harmful microalgae is completely lacking. Yet costs are often assumed to be high, implying substantial ecological benefits with adaptive significance exist. To study potential fitness toxin production, 16 strains including three species former Alexandrium tamarense complex were grown under both carbon limitation and unlimited conditions. Growth rates, levels intracellular paralytic shellfish toxins (PSTs), effects lytic measured...

AbstractCultures were established from cysts of the cyst-based taxa Spiniferites elongatus and S. membranaceus. Motile cells both cultures sediment samples examined using light scanning electron microscopy. The cyst–theca relationship was for elongatus. motile have tabulation pattern 2 pr, 4′, 6″, 6c, ≥ 4s, 6″′, 1p, 1″″, but they remain unattributable to previously described Gonyaulax species. There large variation in process length morphology wild there ornamentation development spines...