European journal of protistology最新文献

Algal organic matter alters protistan community structure and assembly processes in coastal sediments.

IF 1.9 2区生物学

European journal of protistology Pub Date : 2025-01-21 DOI: 10.1016/j.ejop.2025.126134

Arbaz Rehman, Jing Wang, Hao Yue, Xiuhong Zhang, Zelong Li

{"title":"Algal organic matter alters protistan community structure and assembly processes in coastal sediments.","authors":"Arbaz Rehman, Jing Wang, Hao Yue, Xiuhong Zhang, Zelong Li","doi":"10.1016/j.ejop.2025.126134","DOIUrl":"https://doi.org/10.1016/j.ejop.2025.126134","url":null,"abstract":"<p><p>Diatom blooms are a global ecological perturbation that releases algal organic matter (AOM), significantly affecting coastal ecosystems by altering microbial community dynamics. AOM, derived from algal cell lysis, may serve as a nutrient source influencing protistan communities. However, the effects of AOM on protistan ecology, including the community structure and assembly processes, remain largely unexplored in coastal sediments. In this study, we investigated the impact of AOM on the protistan community structure using macrogenomic analysis and high-throughput sequencing. The results revealed significant shifts in the protistan diversity (alpha and beta diversity) and community composition. Phototrophs and consumers were the primary functional groups affected, with their relative abundances significantly regulated by AOM, highlighting its functional-level impacts. Moreover, AOM influenced also the protistan community assembly, increasing the proportion of deterministic processes and altering the dynamic succession within the protistan co-occurrence network. Diatom blooms act as ecological filters, reducing diversity while promoting the dominance of specific functional groups. This study bridges the gap in understanding the AOM's role in shaping the ecological succession of protists in coastal sediments, offering valuable insights into the broader ecological impact of marine diatom blooms.</p>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"97 ","pages":"126134"},"PeriodicalIF":1.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143058582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Morphology and phylogeny of Pararaabena dentata Wolska, 1968 and further insights into the molecular evolution of trichostome ciliates (Ciliophora, Litostomatea).

IF 1.9 2区生物学

European journal of protistology Pub Date : 2025-01-11 DOI: 10.1016/j.ejop.2025.126133

Gözde Gürelli, Fevziye Işıl Kesbiç

引用次数: 0

Morphological and morphometric investigations on testate amoebae from Mongolia with descriptions of a new genus and four new species. 蒙古遗存变形虫的形态学和形态计量学研究及一新属和四新种描述。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-12-06 DOI: 10.1016/j.ejop.2024.126128

Dominika Łuców, Ferry Siemensma, Dashtseren Avirmed, Milena Obremska, Michał Słowiński, Izabela Zawiska

{"title":"Morphological and morphometric investigations on testate amoebae from Mongolia with descriptions of a new genus and four new species.","authors":"Dominika Łuców, Ferry Siemensma, Dashtseren Avirmed, Milena Obremska, Michał Słowiński, Izabela Zawiska","doi":"10.1016/j.ejop.2024.126128","DOIUrl":"https://doi.org/10.1016/j.ejop.2024.126128","url":null,"abstract":"<p><p>Testate amoebae are a polyphyletic and highly diverse group of unicellular protists, inhabiting various habitats and successfully used as indicators of property of environmental variables, providing information on hydrology, pH and pollution of ecosystems. However, despite numerous studies, there is still a lack of data regarding their species diversity, geographical distribution and population dynamics in various habitats from previously unexplored or poorly investigated regions such as Mongolia. In this study, we describe the morphology and morphometry of a new genus and four new species: Armatura murmillo gen. nov., sp. nov., Trinema lenticularis sp. nov., T. parmularius sp. nov. and T. scutarius sp. nov., derived from peat cores extracted from two fens in northern Mongolia. We provide one of the first case studies of testate amoebae from Mongolia, documenting 64 taxa. We also provide information on the morphology and variability of four lesser known species: Centropyxis lapponica, Hyalosphenia insecta, Pyxidicula ornata and Schoenbornia smithi.</p>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"97 ","pages":"126128"},"PeriodicalIF":1.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The mitochondrial citrate synthase from Tetrahymena thermophila does not form an intermediate filament 嗜热四膜虫的线粒体柠檬酸合成酶不形成中间丝。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126121

Stefano Lometto , Daniela Sparvoli , Gabriele Malengo , Thomas Heimerl , Georg K.A. Hochberg

{"title":"The mitochondrial citrate synthase from Tetrahymena thermophila does not form an intermediate filament","authors":"Stefano Lometto , Daniela Sparvoli , Gabriele Malengo , Thomas Heimerl , Georg K.A. Hochberg","doi":"10.1016/j.ejop.2024.126121","DOIUrl":"10.1016/j.ejop.2024.126121","url":null,"abstract":"<div><div>The mitochondrial citrate synthase (mCS) purified from the ciliate <em>Tetrahymena thermophila</em> has been reported to form intermediate-filament-like structures during conjugation and to self-assemble into fibers when recombinantly expressed. This would represent a rare example of a tractable and recent origin of a novel cytoskeletal element. In an attempt to investigate the evolutionary emergence of this behavior, we re-investigated the ability of <em>Tetrahymena</em>’s mCS to form filaments in vivo. Using strep-tagged mCS in <em>Tetrahymena</em> and monoclonal antibodies, we found no evidence of filamentous structures during conjugation or starvation. Extensive biochemical characterization of mCS revealed that the self-assembly of recombinant protein is triggered by a specific chemical moiety shared by MES and HEPES buffers used in previous studies. The absence of indicative phenotypes in fiber-deficient GFP-tagged mutants indicates that <em>Tetrahymena</em> mCS did not evolve a structural role in sexual reproduction or metabolic regulation.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126121"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142461230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Testate amoebae from the wetlands of the Phobjikha Valley of Bhutan, the Eastern Himalayas 喜马拉雅山脉东部不丹 Phobjikha 山谷湿地的睾丸变形虫。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126125

Manfred Wanner , Ferry Siemensma , Indra Prasad Acharja , Jigme Tshering , Pema Khandu , Santa Lal Gajmer , Chöki Gyeltshen , Tshering Dorji , Kinley Tenzin , Satoshi Shimano

{"title":"Testate amoebae from the wetlands of the Phobjikha Valley of Bhutan, the Eastern Himalayas","authors":"Manfred Wanner , Ferry Siemensma , Indra Prasad Acharja , Jigme Tshering , Pema Khandu , Santa Lal Gajmer , Chöki Gyeltshen , Tshering Dorji , Kinley Tenzin , Satoshi Shimano","doi":"10.1016/j.ejop.2024.126125","DOIUrl":"10.1016/j.ejop.2024.126125","url":null,"abstract":"<div><div>The Kingdom of Bhutan in the Eastern Himalayas harbors a rich biodiversity. However, its detailed documentation still needs to be created, including not only macroorganisms but also protists. In the present study, as many as 105 taxa of testate amoebae were identified and directly counted in soil suspension samples collected from the wetlands of the Gangtey-Phobji Valley (generally Phobjikha), Wangdue Phodrang district. The most dominant were cosmopolitan species, e.g., <em>Euglypha rotunda</em>, <em>Trinema lineare</em>, <em>T. complanatum</em>, <em>T. enchelys</em>, <em>Phryganella acropodia</em>, and <em>Plagiopyxis declivis</em>. However, some taxa such as <em>Centropyxis deflandriana, C. stenodeflandriana</em>, <em>Hoogenraadia</em> cf<em>. humicola</em>, <em>Pareuglypha reticulata</em>, and <em>Sphenoderia chardezi</em> have a geographically restricted distribution and/or are considered rare. Some specimens could not be assigned to already described species (<em>Centropyxis dentata</em> sp. nov. and <em>Difflugia fusiforma</em> sp. nov.) or were highly similar to known species but differed in size or other taxonomically important characteristics (e.g., <em>Hoogenraadia</em> cf. <em>humicola</em> and <em>Planhoogenraadia</em> sp.). To our knowledge, this study is the first to present a comprehensive list of testate amoebae from Bhutan, including some new and rare species. The discovery of a remarkable diversity of testate amoebae in only a few soil samples suggests that this remote and largely unexplored region likely harbors many more intriguing species.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126125"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142617431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Morphology, morphogenesis, and molecular phylogeny of Holostichides (Holostichides) parachardezi nov. spec. (Ciliophora, Hypotrichia, Urostylida), a new soil ciliate from China 来自中国的新土壤纤毛虫 Holostichides (Holostichides) parachardezi nov.(来自中国的一种新的土壤纤毛虫。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126124

Ziyan Liu, Kexin Wang, Chengliang Zhang, Yuwen Jiang, Ranran Song, Tengyue Zhang, Fengchao Li

{"title":"Morphology, morphogenesis, and molecular phylogeny of Holostichides (Holostichides) parachardezi nov. spec. (Ciliophora, Hypotrichia, Urostylida), a new soil ciliate from China","authors":"Ziyan Liu, Kexin Wang, Chengliang Zhang, Yuwen Jiang, Ranran Song, Tengyue Zhang, Fengchao Li","doi":"10.1016/j.ejop.2024.126124","DOIUrl":"10.1016/j.ejop.2024.126124","url":null,"abstract":"<div><div>A new urostylid ciliate, <em>Holostichides</em> (<em>Holostichides</em>) <em>parachardezi</em>, collected from a Chinese tropical city, was studied using morphological and molecular methods. Diagnostic features of the new species include: size 140–180 × 30–60 μm in vivo; 25–43 macronuclear nodules; colourless cortical granules; three to six frontoterminal cirri; a midventral complex composed of seven to eleven cirral pairs and one midventral row of five to eleven cirri; four bipolar dorsal kineties and six to nine caudal cirri in four groups; and a terrestrial habitat. Its ontogenesis follows the typical <em>Holostichides</em> mode in that (1) the proximal portion of the parental adoral zone of membranelles is partly renewed and the opisthe’s oral primordium originates very close to the midventral complex; (2) the last anlage <em>n</em> generates the frontoterminal cirral row, and the midventral complex is formed from anlage IV to <em>n</em> − 1; and (3) both marginal rows and dorsal kinety anlagen develop within the parental rows. The present SSU rDNA phylogenies corroborated the monophyly of the genus <em>Holostichides</em>.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126124"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

O short-branch Microsporidia, where art thou? Identifying diversity hotspots for future sampling 短枝微孢子虫啊，你在哪里？为未来采样确定多样性热点

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126119

Megan Gross , Ľubomír Rajter , Frédéric Mahé , David Bass , Cédric Berney , Nicolas Henry , Colomban de Vargas , Micah Dunthorn

{"title":"O short-branch Microsporidia, where art thou? Identifying diversity hotspots for future sampling","authors":"Megan Gross , Ľubomír Rajter , Frédéric Mahé , David Bass , Cédric Berney , Nicolas Henry , Colomban de Vargas , Micah Dunthorn","doi":"10.1016/j.ejop.2024.126119","DOIUrl":"10.1016/j.ejop.2024.126119","url":null,"abstract":"<div><div>Short-branch Microsporidia were previously shown to form a basal grade within the expanded Microsporidia clade and to branch near the classical, long-branch Microsporidia. Although they share simpler versions of some morphological characteristics, they do not show accelerated evolutionary rates, making them ideal candidates to study the evolutionary trajectories that have led to long-branch microsporidian unique characteristics. However, most sequences assigned to the short-branch Microsporidia are undescribed, novel environmental lineages for which the identification requires knowledge of where they can be found. To direct future isolation, we used the EukBank database of the global UniEuk initiative that contains the majority of the publicly available environmental V4 SSU rRNA gene sequences of protists. The curated OTU table and corresponding metadata were used to evaluate the occurrence of short-branch Microsporidia across freshwater, hypersaline, marine benthic, marine pelagic, and terrestrial environments. Presence–absence analyses infer that short-branch Microsporidia are most abundant in freshwater and terrestrial environments, and alpha- and beta-diversity measures indicate that focusing our sampling effort on these two environments would cover a large part of their overall diversity. These results can be used to coordinate future isolation and sampling campaigns to better understand the enigmatic evolution of microsporidians’ unique characteristics.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126119"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Disentangling the metabolic profile of rumen ciliates: A historical perspective and future directions 解析瘤胃纤毛虫的代谢特征：历史视角与未来方向

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126126

Valdirley de Souza Lima, Franciane Cedrola, Millke Jasmine Arminini Morales, Vera Nisaka Solferini

引用次数: 0

A new species of the Trichia botrytis complex from the cloud forest in Ecuador 厄瓜多尔云雾林中的一种新的 Trichia botrytis 复合菌种。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126123

Dmytro Leontyev , Edvin Johannesen , Gabriel Moreno , Iryna Yatsiuk , Martin Schnittler

引用次数: 0

Architecture of the flagellar apparatus and related structures in Kolkwitziella acuta: Towards a fine-structural characterization of pallium-feeding dinoflagellates (Protoperidiniaceae) Kolkwitziella acuta 的鞭毛器及相关结构：对食藻类甲藻（原甲藻纲）进行精细结构鉴定。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126120

Sandra C. Craveiro , Mariana S. Pandeirada , Øjvind Moestrup , António J. Calado

{"title":"Architecture of the flagellar apparatus and related structures in Kolkwitziella acuta: Towards a fine-structural characterization of pallium-feeding dinoflagellates (Protoperidiniaceae)","authors":"Sandra C. Craveiro , Mariana S. Pandeirada , Øjvind Moestrup , António J. Calado","doi":"10.1016/j.ejop.2024.126120","DOIUrl":"10.1016/j.ejop.2024.126120","url":null,"abstract":"<div><div>The fine-structural organization of the protoperidiniacean <em>Kolkwitziella acuta</em> was examined by SEM and TEM. Serial sections of five cells of <em>K. acuta</em> were used to study the architecture of basal bodies and associated roots, the pusular system, and the feeding apparatus. The basal bodies were inserted 1 µm apart at an angle of ca. 80°, and displayed the typical peridinioid features of associating with two roots each and having a layered connective linking the longitudinal microtubular root to the transverse striated root. The transverse flagellar canal was associated with a ‘sac pusule’, while the longitudinal flagellar canal was linked, via a pusule canal surrounded by a conspicuous layer of striated material, to a collecting chamber from which ca. 40 pusular tubes radiated. An extruded pallium was present, associated with a microtubular strand (the MSP) that extended anteriorly and progressively separated into six or seven groups of microtubules, with electron-opaque vesicles present along the MSP. A prominent striated collar surrounded the exit area of the pallium and was connected to the striated collars of both the transverse and longitudinal flagellar canals. The partial nuclear-encoded LSU rDNA sequence confirmed the identification as <em>K. acuta</em>. The currently known fine-structural features of pallium-feeding Protoperidiniaceae are summarized.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126120"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142389120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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