European journal of protistology最新文献_第3页

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

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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

Ecology of free-living freshwater heterotrophic euglenoids: A summarizing review 自由生活淡水异养拟绿藻生态学综述。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126127

Jaroslav Kubín , Josef Juráň

{"title":"Ecology of free-living freshwater heterotrophic euglenoids: A summarizing review","authors":"Jaroslav Kubín , Josef Juráň","doi":"10.1016/j.ejop.2024.126127","DOIUrl":"10.1016/j.ejop.2024.126127","url":null,"abstract":"<div><div>This review aims to compile sparse information on the ecology of freshwater heterotrophic euglenoids and synthesize the main phenomena and hypotheses from published results. Apparently, heterotrophic euglenoids play a very important role in the nutrient flow of water ecosystems and are irreplaceable heterotrophic contributors in benthic communities, as their total biomass is by far the largest among heterotrophic flagellates. Even though they are obviously a very crucial part of the diversity of freshwater heterotrophic protists, and likely the most represented (in terms of biovolume) group of heterotrophic flagellates, there have been only a few attempts to elucidate their ecological preferences, roles, niches, and importance. They exhibit three nutrition modes—bacterivory, eukaryovory, and osmotrophy—which are strategies closely related to their taxonomical groupings and phylogenetic positions. Unfortunately, the phylogeny of the majority of the species remains unknown, similar to their autecology. There are major problems with the quantitative research methodologies, which is a big challenge for future research to improve.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126127"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791344","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 molecular phylogeny of Pelagothrix abietum (Penard, 1922) comb. nov. and two new Metacystis and Apolagynus species (Ciliophora, Prostomatea) Morphology and molecular phylogeny of Pelagothrix abietum (Penard, 1922) comb.

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-10-01 DOI: 10.1016/j.ejop.2024.126122

Limin Jiang , Qianhui Sun , Xiaoxuan Zhu , Hunter N. Hines , Xiaozhong Hu

{"title":"Morphology and molecular phylogeny of Pelagothrix abietum (Penard, 1922) comb. nov. and two new Metacystis and Apolagynus species (Ciliophora, Prostomatea)","authors":"Limin Jiang , Qianhui Sun , Xiaoxuan Zhu , Hunter N. Hines , Xiaozhong Hu","doi":"10.1016/j.ejop.2024.126122","DOIUrl":"10.1016/j.ejop.2024.126122","url":null,"abstract":"<div><div>Ciliates of the class Prostomatea show a broad spectrum of feeding strategies and often occur abundantly in various aquatic habitats, playing a vital role in the biogeochemical cycle. Due to their small cell size and simple structure, prostomateans were considered to be a group with a lower degree of morphological differentiation for a long time. However, recent research suggests that the diversity of this group of ciliates is higher than previously thought. In the present study, three prostomateans, collected from different localities in China and classified into three families, were examined using morphological and phylogenetic techniques. Our analyses revealed two new species, <em>Metacystis multitricha</em> sp. nov. and <em>Apolagynus spiralis</em> sp. nov., and suggested a transfer of <em>Prorodon abietum</em> Penard, 1922 to the genus <em>Pelagothrix</em>. Phylogenetic analyses corroborated the morphological classifications of the three species into the families Metacystidae, Lagynusidae, and Holophryidae, respectively, demonstrating that their diagnostic characteristics bear an evolutionary signal at the family level.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"96 ","pages":"Article 126122"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142568197","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

Resource supply and intraspecific variation in inducible defense determine predator–prey interactions in an intraguild predation food web 资源供应和诱导性防御的种内变异决定了捕食者与被捕食者之间的相互作用。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-08-01 DOI: 10.1016/j.ejop.2024.126114

Fenja-Marie Möller , Sabine Flöder , Graziano Di Giuseppe , Stefanie Devi Moorthi

{"title":"Resource supply and intraspecific variation in inducible defense determine predator–prey interactions in an intraguild predation food web","authors":"Fenja-Marie Möller , Sabine Flöder , Graziano Di Giuseppe , Stefanie Devi Moorthi","doi":"10.1016/j.ejop.2024.126114","DOIUrl":"10.1016/j.ejop.2024.126114","url":null,"abstract":"<div><p>This study investigated the dynamics of reciprocal phenotypic plasticity entailing inducible defense and offense in freshwater ciliate communities in response to altered resource supply and the extent of intraspecific trait variation. Communities consisted of <em>Euplotes octocarinatus</em> (intraguild prey) capable of inducible defense to escape predation, <em>Stylonychia mytilus</em> (intraguild predator) capable of inducible offense to expand its prey spectrum, and <em>Cryptomonas</em> sp. (algal resource). The extent of inducible defense was tested in ten different <em>Euplotes</em> strains in response to freeze-killed <em>Stylonychia</em> concentrate, revealing significant differences in their width and length development. In a subsequent 30-day experiment, four strains were incubated in monoculture and mixture with <em>Stylonychia</em> under continuous and pulsed microalgae supply. The polyclonal <em>Euplotes</em> population outperformed the monoclonal populations, except one, which developed the most pronounced inducible defense and retained the highest biovolume. <em>Stylonychia</em> fluctuated in size, but dominated all communities irrespective of clonal composition. Pulsed resource supply promoted biovolume production of both species. However, periods of resource depletion resulted in more <em>Stylonychia</em> resting cysts, allowing <em>Euplotes</em> to resume growth. Our study provides new insights into interactions of induced defense and intraguild predation under variable environmental conditions, emphasizing the relevance of intraspecific trait variation for predator–prey interactions and community dynamics.</p></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"95 ","pages":"Article 126114"},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000646/pdfft?md5=b430c9714d85d9e55e027513e4d873f8&pid=1-s2.0-S0932473924000646-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142079812","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

Comparison of mixotrophic and heterotrophic chrysomonads of similar size regarding bacterivory and growth rate 大小相似的混养和异养金丝单胞菌在细菌吞噬和生长速度方面的比较

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-08-01 DOI: 10.1016/j.ejop.2024.126109

Tobias Pietsch, Hartmut Arndt

{"title":"Comparison of mixotrophic and heterotrophic chrysomonads of similar size regarding bacterivory and growth rate","authors":"Tobias Pietsch, Hartmut Arndt","doi":"10.1016/j.ejop.2024.126109","DOIUrl":"10.1016/j.ejop.2024.126109","url":null,"abstract":"<div><p>Small chrysomonads are important bacterivores in aquatic ecosystems with a high molecular diversity compared to low morphological differences observed by light microscopy. The high diversity of these morphologically almost indistinguishable species leads to the question to which extent their functional role in ecosystems differs and how their ecological traits can be defined. The present study investigates the prey size and population growth rate of different chrysomonad species. Eleven phylogenetically well-defined strains representing seven strains of heterotrophic and four strains of mixotrophic chrysomonads were compared. All investigated strains belonged to the same functional group of bacterivorous flagellates, feeding on the same bacteria size range, while population growth rates of chrysomonads depended on nutritional strategy and species-specific differences. We observed a high individual variability of growth rates within a population. Our results point to the necessity to consider not only differences in ecological traits among species but also among specimens within a population.</p></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"95 ","pages":"Article 126109"},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000592/pdfft?md5=7c67f02916851a93cc54e576f31261d8&pid=1-s2.0-S0932473924000592-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853626","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

Morphology and molecular phylogeny of Euplotes baugilensis n. sp. (Ciliophora, Spirotrichea), with an illustrated key to Euplotes species with reduced cirri Euplotes baugilensis n. sp. (Ciliophora, Spirotrichea) 的形态学和分子系统发育，附带绘有图解的具有退化卷须的 Euplotes 种的检索表

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-08-01 DOI: 10.1016/j.ejop.2024.126110

Eun-Hye Do , Hye-In Kwon , Jeong Hyeon Yeo , Pablo Quintela-Alonso , Jae-Ho Jung

{"title":"Morphology and molecular phylogeny of Euplotes baugilensis n. sp. (Ciliophora, Spirotrichea), with an illustrated key to Euplotes species with reduced cirri","authors":"Eun-Hye Do , Hye-In Kwon , Jeong Hyeon Yeo , Pablo Quintela-Alonso , Jae-Ho Jung","doi":"10.1016/j.ejop.2024.126110","DOIUrl":"10.1016/j.ejop.2024.126110","url":null,"abstract":"<div><p><em>Euplotes baugilensis</em> n. sp. was discovered in a temporary puddle that formed after rainfall on a mountain footpath near Gangneung-Wonju National University in Gangneung, South Korea. After isolation, a pure culture was established, and the new species was examined using live observation, silver-impregnation (protargol and ‘wet’ silver nitrate), scanning electron microscopy, and the analysis of the 18S rRNA gene sequence. Morphologically, <em>E. baugilensis</em> n. sp. is characterized by small body size (on average 49 × 31 µm in vivo), 9 ordinary fronto-ventral cirri (cirrotype-9) with one reduced cirrus V/2 (composed of four non-ciliated basal bodies), 5 transverse cirri, 7 or 8 dorsolateral kineties, 6 dorsal prominent ridges, and a dargyrome (silverline system) of double type. In this study, we have used a combination of morphological and molecular techniques to characterize <em>E. baugilensis</em> n. sp. and determine its phylogenetic position within the genus <em>Euplotes</em>. Molecular analysis using 18S rRNA gene sequences indicated that <em>E. baugilensis</em> n. sp. is most closely related to <em>E. curdsi</em> (with a sequence identity of 96.8 %).</p></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"95 ","pages":"Article 126110"},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141838439","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

Molecular characterization of a catalase gene in the freshwater green alga Closterium ehrenbergii and its putative function against abiotic stresses 淡水绿藻 Closterium ehrenbergii 中过氧化氢酶基因的分子特征及其对非生物胁迫的推定功能

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-08-01 DOI: 10.1016/j.ejop.2024.126111

Hui Wang , Peiling Wu , Fengru Li , Jeongmin Shin , Jang-Seu Ki

{"title":"Molecular characterization of a catalase gene in the freshwater green alga Closterium ehrenbergii and its putative function against abiotic stresses","authors":"Hui Wang , Peiling Wu , Fengru Li , Jeongmin Shin , Jang-Seu Ki","doi":"10.1016/j.ejop.2024.126111","DOIUrl":"10.1016/j.ejop.2024.126111","url":null,"abstract":"<div><p>Catalases (CATs) are ubiquitous antioxidant enzymes that prevent cellular oxidative damage through the decomposition of H<sub>2</sub>O<sub>2</sub>. However, there is relatively little information on CAT in the worldwide-distributed freshwater green alga <em>Closterium ehrenbergii</em>. Here, we cloned the full-length catalase cDNA from <em>C</em>. <em>ehrenbergii</em> (<em>CeCAT</em>) and characterized its structural features and expressional responses against aquatic contaminants. The open reading frame of <em>CeCAT</em> was determined to be 1476 bp, encoding 491 amino acids with a theoretical molecular mass of 56.1 kDa. The CeCAT protein belongs to the NADPH-binding CAT family and might be located in the cytosol. BLAST and phylogenetic results showed that CeCAT had a high identity with CAT proteins from other microalgae and the water lily <em>Nymphaea colorata</em> (Streptophyta). The transcriptional levels of <em>CeCAT</em> were significantly upregulated by the metal copper and herbicide atrazine, but little affected by other tested metals (Ni and Cr) and endocrine-disrupting chemicals (polychlorinated biphenyl, PCB). The maximum expression was registered under 0.1 mg/L CuCl<sub>2</sub> and 0.2 mg/L CuSO<sub>4</sub> exposures. In addition, excess copper considerably increased production of reactive oxygen species in the cells. These results suggest that CeCAT may function to defend against oxidative stress in green algae and can respond specifically to different kinds of metals and herbicides.</p></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"95 ","pages":"Article 126111"},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964274","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

Ciliate diversity and growth rates in experimental recirculating aquaculture and aquaponics systems using microscopy 利用显微镜观察试验性循环水产养殖和鱼菜共生系统中纤毛虫的多样性和生长率

IF 1.9 2区生物学

European journal of protistology Pub Date : 2024-08-01 DOI: 10.1016/j.ejop.2024.126113

Stefanos Moschos , Konstantinos Ar. Kormas , Hera Karayanni

{"title":"Ciliate diversity and growth rates in experimental recirculating aquaculture and aquaponics systems using microscopy","authors":"Stefanos Moschos , Konstantinos Ar. Kormas , Hera Karayanni","doi":"10.1016/j.ejop.2024.126113","DOIUrl":"10.1016/j.ejop.2024.126113","url":null,"abstract":"<div><p>The function of recirculating aquaculture systems (RAS) relies on microbial communities, which convert toxic, fish-excreted ammonia into substances that can provide nutrients to plants as in the case of aquaponics systems. In the present study, heterotrophic protist communities of experimental sea water RAS and freshwater aquaponics systems were investigated using microscopy to characterize their diversity, natural abundance, and potential growth rates. Heterotrophic protist abundance was low (732 ± 21 to 5451 ± 118 ciliates L<sup>−1</sup> and 58 ± 8 to 147 ± 18 nanoflagellates mL<sup>−1</sup> in the aquaponics system and 78 ± 28 to 203 ± 48 ciliates L<sup>−1</sup> in the RAS), which is in line with values typically reported for rivers. In the aquaponics system, ciliates grew faster in the fish rearing tanks (1.9 ± 0.01 to 1.21 ± 0.03 d<sup>−1</sup> compared to 0.54 ± 0.03 to 0.79 ± 0.05 d<sup>−1</sup> in the other compartments), while heterotrophic nanoflagellates grew slower in drain tanks downstream of the hydroponics compartment (0.5 ± 0.3 to 1.37 ± 0.05 d<sup>−1</sup> and 4.09 ± 0.11 d<sup>−1</sup> to 6.03 ± 0.34 d<sup>−1</sup>in the other compartments). Results indicated distinct niches and reduced microeukaryotic diversity at the end of the system’s operation cycle.</p></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"95 ","pages":"Article 126113"},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142083916","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