Diatom Research最新文献_第4页

Taxonomy and Valve Ultrastructure of New and Interesting Freshwater Fossil Diatoms (Bacillariophyta) of Miocene age from the Espanola Formation of New Mexico, USA. I. Ontogeny of Tetracyclus stelloides sp. nov., with Comments on ‘Accepted Names’ and Hustedt's Concepts of ‘Convergence’ and ‘Miserable Forms’ 美国新墨西哥州Espanola组中新世淡水硅藻化石(硅藻门)的分类和阀超微结构。1 .星形四环虫的个体发生——兼评“公认名称”和Hustedt的“趋同”和“悲惨形态”概念

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-08-09 DOI: 10.1080/0269249x.2022.2087742

J.P. Kociolek, D.M. Williams, A. Danz

引用次数: 0

Symmetric biraphid diatoms (largely non-Navicula) from the Laurentian Great Lakes 劳伦斯五大湖的对称双蚜硅藻（主要为非Navicula）

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-08-09 DOI: 10.1080/0269249X.2022.2096121

E. Reavie

引用次数: 2

Transcriptomic reprogramming of diatom Minutocellus polymorphus grown on urea 尿素上生长的多形硅藻转录组重编程

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2134215

Mei Zhang, Ying Li, Tie-zhu Mi, F. Chen, Yu Zhen

{"title":"Transcriptomic reprogramming of diatom Minutocellus polymorphus grown on urea","authors":"Mei Zhang, Ying Li, Tie-zhu Mi, F. Chen, Yu Zhen","doi":"10.1080/0269249X.2022.2134215","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2134215","url":null,"abstract":"Minutocellus polymorphus MMDL5290, a minute diatom, can efficiently utilize organic nitrogen (N) urea as the sole N source and achieve equivalent growth rate and photosynthesis capacity as it does with nitrate. Interestingly, M. polymorphus MMDL5290 growing on urea-replete (400 µM) medium yields a similar growth rate to that on nitrate-replete (882 µM). So far, very few reports are available on the molecular regulation mechanisms of microalgae with similar growth potential under different N sources. To address this gap, our study aimed to characterize the differences in transcriptome-level responses of M. polymorphus MMDL5290 between nitrate-replete and urea-replete conditions. We identified 4075 differentially expressed genes between these two groups. Interestingly, gene expression in light-harvesting, electron transport chain, ATP synthesis, and chlorophyll and carotenoid synthesis was up-regulated under urea, while the expression of carbon fixation genes did not change significantly. Meanwhile, transcriptome profiling indicated that under the urea-replete condition, M. polymorphus MMDL5290 triggered massive gene expression reconfiguration, inducing cells to increase investment in protein synthesis and antioxidative stress. This may explain why higher photosynthetic capacity in urea-grown cells does not lead to higher growth. Furthermore, down-regulation of PT (signal peptide) genes was observed under the urea-replete condition, suggesting a repressed capacity of phosphate transport. In addition, we identified 139 stably and highly expressed genes, which have the potential to be used as candidate reference genes in future gene expression studies on M. polymorphus MMDL5290.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"227 - 239"},"PeriodicalIF":1.8,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43472414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Aulacoseira newjerseyana sp. nov. (Bacillariophyta) a new freshwater centric diatom species from the northeastern USA Aulacoseira newjerseyana sp. 11 .(硅藻门):美国东北部淡水中心硅藻新种

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2118834

M. Enache, Marina G. Potapova, Meredith Tyree Polaskey, S. Spaulding

引用次数: 0

Valve and ‘Stigma’ Structure and Phylogeny of an Enigmatic Cymbelloid Diatom Karthickia verestigmata Glushchenko, Kulikovskiy & Kociolek 一个隐隔的类柱状硅藻Karthickia verestimata Glushchenko，Kulikovskiy和Kociolek的阀瓣和“柱头”结构及系统发育

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2101545

Ekkachai Yana, Surakit Nakkaew, J. Pekkoh, Y. Peerapornpisal, A. Tuji, M. P. Davis, Matthew L. Julius, S. Mayama

{"title":"Valve and ‘Stigma’ Structure and Phylogeny of an Enigmatic Cymbelloid Diatom Karthickia verestigmata Glushchenko, Kulikovskiy & Kociolek","authors":"Ekkachai Yana, Surakit Nakkaew, J. Pekkoh, Y. Peerapornpisal, A. Tuji, M. P. Davis, Matthew L. Julius, S. Mayama","doi":"10.1080/0269249X.2022.2101545","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2101545","url":null,"abstract":"The epilithic diatom Karthickia verestigmata Glushchenko et al. was described from North Viet Nam and Laos. Karthickia is a monotypic genus characterized by a unique ‘stigma’ located on the secondary side of the valve with an external circular opening and opening internally by two elongated slits. In 2012 we collected a diatom population consistent with the description of K. verestigmata from the Wang Kaew Waterfall on the upper Wang River in Doi Luang National Park, Thailand. This study details its internal ‘stigma’ structure utilizing sections made with a focused ion beam and observed with a scanning electron microscopy. From the bottom of external circular hole two narrowly flat spaces expanded from the bottom of the external opening down to each inner slit, lying in a trough that is a partial extension of a stria. A phylogenetic hypothesis for Karthickia was created using multiple genes. The taxonomic status of Karthickia is discussed in the context of other genera in the Cymbellales.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"293 - 305"},"PeriodicalIF":1.8,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48583609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 2

Rimocostatus bugojnicus gen.et. sp. nov. (Coscinodiscophyceae, Bacillariophyta) – a new fossil diatom genus from Gračanica, Bugojno palaeolake in Bosnia and Herzegovina 黄颡鱼属;sp. nov. (Coscinodiscophyceae，硅藻门)-波黑Bugojno古湖泊gra<s:1> anica硅藻新化石属

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2130993

E. Masic, Dušica Zaova, S. Barudanović, Nadja Ognjanova-Rumenova, Z. Levkov

引用次数: 0

Observations on Late Cretaceous Micrampulla (Corethrales, Bacillariophyceae) from the Campbell Plateau (Zealandia), southwest Pacific Ocean 西南太平洋坎贝尔高原晚白垩世微藻(Corethrales, diariophyceae)的观察

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2118835

K. Abe, D. Harwood, R. Jordan

{"title":"Observations on Late Cretaceous Micrampulla (Corethrales, Bacillariophyceae) from the Campbell Plateau (Zealandia), southwest Pacific Ocean","authors":"K. Abe, D. Harwood, R. Jordan","doi":"10.1080/0269249X.2022.2118835","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2118835","url":null,"abstract":"Late Cretaceous (late Campanian) diatom assemblages from the Campbell Plateau (Zealandia), southwest Pacific Ocean, obtained from Deep Sea Drilling Project (DSDP) Leg 29 Site 275, contain well-preserved specimens of two enigmatic diatom species currently assigned to the genus Ktenodiscus; Micrampulla parvula originally described from the Maastrichtian-age Moreno Shale, California, and Pterotheca cretacea from DSDP Site 275. In general, the two species share a number of common features with modern Corethron (domed valves, probable heterovalvate frustules, T-shaped serrated articulated spines, marginal sockets), but differ in the location of the sockets (i.e. vertically at the base of the valve dome and not on the rim), the design of the spines and sockets, and the hollow structure extending from the valve centre. Although hooked spines are absent, equivalent 1-spine and 2-spine valves can be recognized in these two species. The recently described genus Praecorethron from the same late Campanian sediments shares many features with Micrampulla, but lacks the inflated central valve structure. As a result of our studies, the relevant subclass, order and family definitions are emended, as well as those of Micrampulla, M. parvula and M. cretacea comb. nov., and a new family, Micrampullaceae fam. nov., is erected to distinguish the ancient genera (Micrampulla and Praecorethron) from modern Corethron.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"241 - 253"},"PeriodicalIF":1.8,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46087822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Drivers predicting biodiversity and community assembly of benthic diatoms in a karst spring environment 岩溶泉环境中底栖硅藻生物多样性和群落聚集预测的驱动因素

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2100486

Pavel Beracko, Lucia Sochuliaková, J. Cíbik, T. Lánczos

{"title":"Drivers predicting biodiversity and community assembly of benthic diatoms in a karst spring environment","authors":"Pavel Beracko, Lucia Sochuliaková, J. Cíbik, T. Lánczos","doi":"10.1080/0269249X.2022.2100486","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2100486","url":null,"abstract":"Geographical location, landscape heterogeneity, and their position at the edge of Quaternary glaciations are the major reasons why the river basins of the Western Carpathians are of the utmost importance for research on European aquatic biodiversity. Moreover, unlike streams, springs have several features determining their insularity in the river continuum. This study aimed to uncover the mechanism forming the diatom assemblages in the karst springs environment, using a two-dimensional approach, including taxonomic and trait data. Thus, (1) the congruence between observed and expected values of null models of taxonomic/functional diversity and functional dispersion and (2) Generalized mixed models and Variation partitioning were used to assess how taxonomic/functional diversity and composition were associated with the local conditions, regional affiliation and spatial springs distance. In 64 rheocrene karst springs (10 karst mountain ranges) of the Western Carpathians, 138 epilithic diatom taxa were found. Null model analyses did not uncover any clear evidence of non-random events forming the spring diatom community. Although, the observed functional diversity did not differ from the null model for most springs, most observed values were lower than the mean value of the null model, suggesting that, except for random events, environmental filtering was an important driver of community assembly. Substratum type, spring connectivity and phosphorus concentration drove the value of taxonomic richness, whereas functional diversity was controlled by silica and bicarbonate concentration as well as spring size. In both models, affiliation to the mountain range (defined as a random factor) was significant. The Variation Partitioning Analysis showed that diatom assemblage composition was mainly determined by local and regional environmental conditions, whilst the distance between springs had only a weak influence.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"181 - 197"},"PeriodicalIF":1.8,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46707048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Diatom taxonomy and environmental drivers of biodiversity in the Taleghan River and reservoir in Central Alborz, Iran 伊朗中部Alborz的Taleghan河和水库中硅藻分类和生物多样性的环境驱动因素

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2123049

A. Naseri, M. Noroozi, Y. Asri, A. Iranbakhsh, S. Saadatmand, E. Atazadeh

引用次数: 0

Shionodiscus karianus sp. nov. (Thalassiosirales, Thalassiosiraceae), a new planktonic diatom from the Kara Sea and notes on some morphological characters of Shionodiscus taxa 卡拉海一种新的浮游硅藻Shionodiscus karianus sp.nov.（Thalassosirales，Thalassosiraceae）及其若干形态特征的研究

IF 1.8 3区生物学

Diatom Research Pub Date : 2022-07-03 DOI: 10.1080/0269249X.2022.2122576

A. A. Georgiev, M. Gololobova

{"title":"Shionodiscus karianus sp. nov. (Thalassiosirales, Thalassiosiraceae), a new planktonic diatom from the Kara Sea and notes on some morphological characters of Shionodiscus taxa","authors":"A. A. Georgiev, M. Gololobova","doi":"10.1080/0269249X.2022.2122576","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2122576","url":null,"abstract":"The genus Shionodiscus (Thalassiosirales, Thalassiosiraceae) includes species that have strutted processes with long inward but reduced outward extensions, a labiate process typically located on the valve face, distant from the margin. Shionodiscus species inhabit the marine environment, and the genus includes both living and fossil species. In the course of our study of plankton samples from the Kara Sea, we found specimens belonging to Shionodiscus. Based on LM, SEM, and TEM investigations, a new species, Shionodiscus karianus sp. nov., is described. This species is distinguished from others in the genus based on areola densities, as well as the fine structure and location of the rimoportula and the central fultoportula and the ultrastructure of the areolae and cingulum. In this paper, we provide a morphological description of this taxon as well as a comparison with similar taxa. Previous records of Shionodiscus species in the Russian Arctic seas are discussed. Finally, we summarize and evaluate information on the important morphological characters, such as rimoportula position and fultoportula structure, for Shionodiscus.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"273 - 292"},"PeriodicalIF":1.8,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49464983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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