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Large Genomes Are Associated With Greater Cell Size and Ecological Shift Towards More Nitrogen-Rich and Higher-Latitude Environments in Microalgae of the Genus Synura 大基因组与大细胞大小和向更富氮和高纬度环境的生态转移有关
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-07-02 DOI: 10.1111/jeu.70026
Dora Čertnerová, Pavel Škaloud, Iva Jadrná, Martin Čertner
{"title":"Large Genomes Are Associated With Greater Cell Size and Ecological Shift Towards More Nitrogen-Rich and Higher-Latitude Environments in Microalgae of the Genus Synura","authors":"Dora Čertnerová,&nbsp;Pavel Škaloud,&nbsp;Iva Jadrná,&nbsp;Martin Čertner","doi":"10.1111/jeu.70026","DOIUrl":"https://doi.org/10.1111/jeu.70026","url":null,"abstract":"<p>The nuclear genome is essential for encoding most of the genes required for cellular processes, but its size alone can alter the characteristics of cells and organisms. Yet, genome size variation and its ecological and evolutionary impacts, particularly in microorganisms, are not well understood. We used flow cytometry to estimate genome size and GC content in 53 evolutionary lineages of the microalgal genus <i>Synura</i> (Chrysophyceae, Stramenopiles). Genome size evolution was reconstructed in a phylogenetic framework using molecular markers. A set of genomic, morphological, and ecogeographic variables characterizing <i>Synura</i> lineages was evaluated and tested as predictors of genome size variation in phylogeny-corrected statistical models. Both genome size and GC content varied widely in <i>Synura</i>, ranging from 0.19 to 3.70 pg of DNA and 34.0% to 49.3%, respectively. Genome size variation was mainly associated with cell size, less with silica scale size, and not with scale ultrastructure. Higher soil nitrogen, higher latitudes, and lower temperatures correlated with larger genomes. Genome size evolution in <i>Synura</i> shows potential dynamism, with increases confined to short terminal branches, indicating lower macroevolutionary stability. Lineages with larger genomes exhibited a narrower range of suitable ecological conditions, possibly due to selection acting deleteriously against larger genomes (and cells).</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Morphology, Systematics and Life Cycle of Ozanamia fimbriatus (Haptista: Centroplasthelida), With Notes on Evolution of Organic Skeleton in Centrohelids 毛蕊虫的形态、分类学和生活史(Haptista: centrroplasthelida)——兼论中心体有机骨架的进化
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-29 DOI: 10.1111/jeu.70022
Daria Drachko, Vasily V. Zlatogursky
{"title":"Morphology, Systematics and Life Cycle of Ozanamia fimbriatus (Haptista: Centroplasthelida), With Notes on Evolution of Organic Skeleton in Centrohelids","authors":"Daria Drachko,&nbsp;Vasily V. Zlatogursky","doi":"10.1111/jeu.70022","DOIUrl":"https://doi.org/10.1111/jeu.70022","url":null,"abstract":"<div>\u0000 \u0000 <p>The majority of centrohelids bear coverings that consist either of siliceous scales or organic spicules. Strains carrying organic spicules appear in all major clades of scale-bearing centrohelids. Sometimes they represent alternative life cycle stages of scale-bearing species, whereas in other cases such strains do not alternate their morphology. Studying this “siliceous-organic” polymorphism is instrumental to understanding centrohelid diversity and evolution. The genus <i>Chlamydaster</i> has unique organic coverings that are formed with a mucous sheath and seemingly lack skeletal elements. Two centrohelid strains matching the description of <i>Chlamydaster fimbriatus</i> were isolated in clonal cultures and studied with the use of light and electron microscopy. The mucous sheath was shown to be covered with short, crisscrossed spicules. One of the strains formed cysts with siliceous spine scales, whereas the other did not encyst. SSU rDNA-based molecular phylogenetics placed the strains into the scale-bearing genus <i>Ozanamia</i>, distant from the type species of <i>Chlamydaster</i>. The new combination <i>Ozanamia fimbriatus</i> (Penard 1904) Drachko was established. The implications of <i>Chlamydaster</i> non-monophyly and the role of the “siliceous-organic” polymorphism in encystment were discussed.</p>\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EXPRESSION OF CONCERN: Cystathionine γ-lyase, an Enzyme Related to the Reverse Transsulfuration Pathway, is Functional in Leishmania spp. 关注表达:半胱硫氨酸γ-裂解酶,一种与反转硫途径相关的酶,在利什曼原虫中有功能。
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-28 DOI: 10.1111/jeu.70021
{"title":"EXPRESSION OF CONCERN: Cystathionine γ-lyase, an Enzyme Related to the Reverse Transsulfuration Pathway, is Functional in Leishmania spp.","authors":"","doi":"10.1111/jeu.70021","DOIUrl":"https://doi.org/10.1111/jeu.70021","url":null,"abstract":"<p>\u0000 <b>EXPRESSION OF CONCERN</b>: <span>L. Giordana</span>, <span>B. S. Mantilla</span>, <span>M. Santana</span>, <span>A. M. Silber</span>, and <span>C. Nowicki</span>, “ <span>Cystathionine γ-lyase, an Enzyme Related to the Reverse Transsulfuration Pathway, is Functional in Leishmania spp</span>.,” <i>Journal of Eukaryotic Microbiology</i> <span>61</span>, no. <span>2</span> (<span>2014</span>): <span>204</span>–<span>213</span>, https://doi.org/10.1111/jeu.12100.\u0000 </p><p>This Expression of Concern is for the above article, published online on 11 January 2014 in Wiley Online Library (wileyonlinelibrary.com), and has been issued by agreement between the journal Editor-in-Chief, Joel B. Dacks; The International Society of Protistologists; and Wiley Periodicals LLC. The Expression of Concern has been agreed due to concerns raised by third parties. A duplication of the Western Blot bands depicting “CS_P” and “CGL_P” has been identified in Figure 5B. The authors have acknowledged an unintentional duplication of one of the western blot images corresponding to CS_P or CGL_P during figure preparation, rather than duplication of the individual band. The authors declare that none of the western blots in the figure were altered in any form. However, due to the time elapsed since publication, the original data could not be recovered to rectify the mistake. As the conclusions are not affected by the issue detected, the journal has decided to issue an Expression of Concern to inform and alert the readers.</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Update on the Morphology and Phylogeny of the Nanoplanktonic Dinoflagellate Prorocentrum nux 纳米浮游鞭毛藻(Dinoflagellate proorocentrum nux)形态与系统发育研究进展
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-26 DOI: 10.1111/jeu.70019
Solenn Mordret, Jenna MacKinnon, Susana A. Breglia, Claudio H. Slamovits, Caroline Chénard
{"title":"An Update on the Morphology and Phylogeny of the Nanoplanktonic Dinoflagellate Prorocentrum nux","authors":"Solenn Mordret,&nbsp;Jenna MacKinnon,&nbsp;Susana A. Breglia,&nbsp;Claudio H. Slamovits,&nbsp;Caroline Chénard","doi":"10.1111/jeu.70019","DOIUrl":"https://doi.org/10.1111/jeu.70019","url":null,"abstract":"<p>The Prorocentrales are a diverse group of dinophytes found in a wide range of marine environments. However, species delimitation in the genus <i>Prorocentrum</i> still remains a challenge, especially for nanoscale species where morphological and molecular information is often incomplete. <i>Prorocentrum nux</i> is an example where information is sparse and efforts are needed. In this study, we present a detailed description of the morphological features and molecular information for a Northwest Atlantic strain (AGSB-0131). Using Scanning Electron Microscopy, additional morphological features from the original description were highlighted, including the periflagellar area configuration (nine vs. seven platelets) and pattern dissimilarities for the large and marginal pores. In addition to the revised description, the 18S rRNA gene, partial 28S rRNA gene, mitochondrial c<i>ox1</i> and <i>cob</i> genes were generated from strain AGSB-0131, revealing some ambiguity in the existing data available for <i>P. nux</i>. An important genetic divergence between the only 18S rRNA sequence currently available for <i>P. nux</i> (strain RCC303) and AGSB-0131 was highlighted, suggesting the importance of using the same strain to retrieve morphological and molecular information for nanodinoflagellates. Adding genetic markers for the correct identification of <i>P. nux</i> will enhance the ability to access its prevalence in the marine environment.</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nematopsis Schneider, 1892 in Nerite Gastropods From Saint Kitts, With a Phylogenetic Study of the Genus, and Placement Within the Phylum Apicomplexa Levine, 1970 Nematopsis Schneider, 1892年在圣基茨的Nerite腹足动物中发现,属的系统发育研究,并将其置于顶复合体门
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-24 DOI: 10.1111/jeu.70023
Nicole A. M. Herbert, Árni Kristmundsson, Nuria Vazquez, Kelsey Hoag, Mark A. Freeman
{"title":"Nematopsis Schneider, 1892 in Nerite Gastropods From Saint Kitts, With a Phylogenetic Study of the Genus, and Placement Within the Phylum Apicomplexa Levine, 1970","authors":"Nicole A. M. Herbert,&nbsp;Árni Kristmundsson,&nbsp;Nuria Vazquez,&nbsp;Kelsey Hoag,&nbsp;Mark A. Freeman","doi":"10.1111/jeu.70023","DOIUrl":"https://doi.org/10.1111/jeu.70023","url":null,"abstract":"<p>The Apicomplexa are obligate unicellular parasites found in terrestrial and aquatic environments. <i>Nematopsis</i> are found infecting marine invertebrates in a life cycle involving mollusks and crustaceans. In the present study, mantle and muscle tissues from nerite gastropods were microscopically examined for <i>Nematopsis</i> using wet mounts and histology. Oocysts contained one single sporozoite surrounded by an ellipsoidal wall and were surrounded by a parasitophorous vacuole within a host phagocyte. Length and width of fresh oocysts were measured and compared between host species. DNA was extracted from infected tissue, and regions of the rRNA gene were amplified using novel primers. <i>Nematopsis</i>-infected tissues from scallops from Argentina and Scotland were used as controls. The sizes of oocysts observed in nerite hosts from Saint Kitts were not significantly different. DNA sequences of <i>Nematopsis</i> isolated from nerite hosts in this study were identical and phylogenetically related to sequences obtained from scallops. Bayesian and maximum likelihood phylogenetic analyses robustly place the <i>Nematopsis</i> DNA sequences from this study with <i>Nematopsis</i> from scallops in Florida and members of the family Porosporidae. We conclude that marine <i>Nematopsis</i> will group within this clade or within the Porosporidae. We have provided specific oligonucleotide primers to assist with the molecular study of the Porosporidae.</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Dinoflagellate Gonyaulax fragilis Is ‘the Wrong Man’ of the Dirty Seas, and Reinstatement of Steiniella Within the Protoceratiaceae (Dinophyceae) 脆弱的甲藻Gonyaulax fragilis是肮脏海洋的“错误的人”,以及原角虫科(甲藻科)Steiniella的恢复
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-11 DOI: 10.1111/jeu.70020
Fernando Gómez, Huan Zhang, Luis Felipe Artigas, Senjie Lin
{"title":"The Dinoflagellate Gonyaulax fragilis Is ‘the Wrong Man’ of the Dirty Seas, and Reinstatement of Steiniella Within the Protoceratiaceae (Dinophyceae)","authors":"Fernando Gómez,&nbsp;Huan Zhang,&nbsp;Luis Felipe Artigas,&nbsp;Senjie Lin","doi":"10.1111/jeu.70020","DOIUrl":"https://doi.org/10.1111/jeu.70020","url":null,"abstract":"<div>\u0000 \u0000 <p>The production of mucilage aggregates is commonly associated with diatoms, but the harmful events known as ‘<i>mare sporco</i>’ or dirty seas have been attributed to the dinoflagellate <i>Gonyaulax fragilis</i> or <i>G. hyalina</i>. The synonymy of these taxa has been debated for decades. We report observations of <i>G. fragilis</i> from the Mediterranean Sea, and Atlantic and Indian Oceans, along with its SSU- and LSU rRNA gene and ITS region sequences from cells of the open Indian Ocean. The rDNA/ITS sequences are distantly related to those identified as <i>G. fragilis</i> from the Mediterranean Sea and New Zealand involved in dirty sea events. Unequivocally, <i>G. fragilis</i> is not the culprit of the mucilage events. <i>Gonyaulax fragilis</i> clusters with full support alongside with <i>Schuettiella mitra</i>, forming a sister group to the benthic genus <i>Carinadinium</i>, as an earlier branching lineage with the Protoceratiaceae (<i>Ceratocorys</i>, <i>Pentaplacodinium</i>, <i>Protoceratium</i>). A single anterior intercalary plate (1a) characterizes these genera, while the Gonyaulacaceae possess 2a. The genus <i>Steiniella</i>, first described for <i>G. fragilis</i> and <i>S. mitra</i>, has historically been synonymized with <i>Gonyaulax</i>. We reinstate <i>Steiniella</i> for these two species, and <i>S. inflata</i>, placing <i>Schuettiella</i> as a junior synonym. The species responsible of the mucilage events is attributed to <i>G. hyalina</i>.</p>\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Identity and Taxonomic Circumscription of the Pfiesteriacean Genera Aduncodinium and Speroidium (Dinophyceae) 拟拟藻科Aduncodinium属和Speroidium属的鉴定与分类界限
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-07 DOI: 10.1111/jeu.70015
Albert Reñé, Aika Yamaguchi, Takeo Horiguchi, António José Calado, Mona Hoppenrath
{"title":"On the Identity and Taxonomic Circumscription of the Pfiesteriacean Genera Aduncodinium and Speroidium (Dinophyceae)","authors":"Albert Reñé,&nbsp;Aika Yamaguchi,&nbsp;Takeo Horiguchi,&nbsp;António José Calado,&nbsp;Mona Hoppenrath","doi":"10.1111/jeu.70015","DOIUrl":"https://doi.org/10.1111/jeu.70015","url":null,"abstract":"<p>With its former circumscription, the genus <i>Katodinium</i> included purportedly naked species with a much larger epi- than hypocone, several of which were shown to be distantly related to the type species <i>K. nieuportense</i>. Most of these species have recently been transferred to other genera, several of them newly established. Among these new genera, <i>Aduncodinium</i> was proposed to encompass <i>Katodinium glandula</i> (=<i>Gymnodinium glandula</i>), and <i>Speroidium</i> was erected to encompass <i>Katodinium fungiforme</i> (=<i>Gymnodinium fungiforme</i>). However, the genus <i>Aduncodinium</i> was invalidly published and several morphological aspects described need to be re-evaluated. On the other hand, the inclusion in <i>K. fungiforme</i> of morphological and molecular characters observed in the strain known as VDH034S “Bullet,” a pfiesteriacean, needs re-evaluation because the latter shows a higher resemblance to <i>Aduncodinium</i> species than to <i>K. fungiforme</i>. The present contribution aimed to clarify the identity of the taxa involved on the basis of newly collected morphological and molecular information, and thereby avoid the nomenclatural and taxonomical uncertainties raised by previously published concepts of the genera <i>Aduncodinium</i> and <i>Speroidium</i>.</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144232360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High Protistan Parasite Occurrence During Fall in a Warm, Low Sea Ice Year in the Eastern Bering Sea 白令海东部温暖低海冰年秋季高原生体寄生虫的发生
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-06-05 DOI: 10.1111/jeu.70018
Tanika M. Ladd, Sylvia M. Kim, Eunji Park, Brian S. Leander, María Débora Iglesias-Rodríguez
{"title":"High Protistan Parasite Occurrence During Fall in a Warm, Low Sea Ice Year in the Eastern Bering Sea","authors":"Tanika M. Ladd,&nbsp;Sylvia M. Kim,&nbsp;Eunji Park,&nbsp;Brian S. Leander,&nbsp;María Débora Iglesias-Rodríguez","doi":"10.1111/jeu.70018","DOIUrl":"https://doi.org/10.1111/jeu.70018","url":null,"abstract":"<p>Marine protists in the eastern Bering Sea (EBS) are understudied despite being a critical component of the productive subarctic ecosystem. Climate change, and particularly the loss of sea ice, is rapidly altering this ecologically vulnerable and economically important system. In this study, the EBS protist community was characterized across recent years with drastic differences in sea ice extent. In 2019, when the extent of sea ice was anomalously low and retreat occurred early, increased fall water temperatures and surface salinities were observed, and the protist community was dominated by apicomplexan parasites. In contrast, 2017 had more typical winter sea ice conditions and in the fall, water temperatures and surface salinities were lower and protist communities were more diverse, with a larger ratio of primary producer to consumer protists compared to 2019. Surface water temperature was identified as a key predictor of apicomplexan compositional abundance and may be important in the life histories of parasites and their hosts. The interannual variability observed here indicates that the transfer of energy and biomass through the EBS ecosystem can differ drastically across years with differential sea ice influence and highlights the need to monitor protist communities and explore the impacts of protistan parasites.</p>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High Grazing Rates of Marine Askenasia cf. stellaris on Mesodinium rubrum and Insights Into Its Taxonomic Status 海星对红中草的高采食率及其分类地位的认识
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-05-30 DOI: 10.1111/jeu.70014
Matthew D. Johnson, Kasia Hammar, David Beaudoin, Houshuo Jiang, Peter Vďačný
{"title":"High Grazing Rates of Marine Askenasia cf. stellaris on Mesodinium rubrum and Insights Into Its Taxonomic Status","authors":"Matthew D. Johnson,&nbsp;Kasia Hammar,&nbsp;David Beaudoin,&nbsp;Houshuo Jiang,&nbsp;Peter Vďačný","doi":"10.1111/jeu.70014","DOIUrl":"https://doi.org/10.1111/jeu.70014","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Askenasia</i> is a conspicuous ciliate in plankton assemblages of fresh and marine ecosystems; however, many aspects of its biology, taxonomy, and ecology remain enigmatic. Here we provide new information on the behavior, prey preferences, ultrastructure, and phylogenetic diversity of marine <i>Askenasia</i>, from perhaps the first ever cultures established for this genus. <i>Askenasia</i> spp. have long been suspected of being predatory, i.e., feeding on other ciliates, and here we reveal that several isolates of marine <i>A</i>. cf. <i>stellaris</i> had high ingestion and growth rates on the ciliate <i>Mesodinium rubrum</i>. This result supports numerous observations of <i>Askenasia</i> co-occurring with <i>M. rubrum</i> in a variety of ecosystems. While we found no evidence of grazing on several other species of ciliates or photosynthetic flagellates, <i>A</i>. cf. <i>stellaris</i> probably does ingest other small ciliates as prey. Using transmission electron microscopy imaging of <i>Askenasia</i>, we show that the dikinetids of its equatorial ciliary belt resemble those found in Prostomatea ciliates, supporting phylogenetic analysis of partial 18S rRNA genes from two <i>A</i>. cf. <i>stellaris</i> strains. We also provide ultrastructural details of the contractile and food vacuoles in <i>Askenasia</i>. Our results suggest that <i>A</i>. cf. <i>stellaris</i> can be an important predator of <i>M. rubrum</i> in coastal marine ecosystems.</p>\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144179300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prorocentrum insidiosum sp. nov. (Prorocentrales, Dinophyceae): Morphological and Phylogenetic Characterization of a Mucosphere Producing Dinoflagellate From the “cordatum Group” proorocentrum insidiosum sp. 11 . (proorocentrales, Dinophyceae):来自“cordatum Group”的一种产生黏液圈的鞭毛藻的形态和系统发育特征
IF 2.1 4区 生物学
Journal of Eukaryotic Microbiology Pub Date : 2025-05-30 DOI: 10.1111/jeu.70017
Michaela E. Larsson, Gustaaf Hallegraeff, Martina A. Doblin, Urban Tillmann
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