Journal of Phycology最新文献

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Genomic and secondary metabolites of the marine cyanobacterium Capilliphycus salinus ALCB114379. 海洋蓝藻Capilliphycus salinus ALCB114379的基因组和次生代谢物
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-05-09 DOI: 10.1111/jpy.70174
Gabriel Schimmelpfeng Passos, Rafael Barty Dextro, Mauricio Junior Machado, Anderson Miguel Teixeira Feitosa, Núbia Pereira Silva, Renata Beatriz Cruz, Ana Paula Dini Andreote, Ernani Pinto, Marli Fatima Fiore
{"title":"Genomic and secondary metabolites of the marine cyanobacterium Capilliphycus salinus ALCB114379.","authors":"Gabriel Schimmelpfeng Passos, Rafael Barty Dextro, Mauricio Junior Machado, Anderson Miguel Teixeira Feitosa, Núbia Pereira Silva, Renata Beatriz Cruz, Ana Paula Dini Andreote, Ernani Pinto, Marli Fatima Fiore","doi":"10.1111/jpy.70174","DOIUrl":"https://doi.org/10.1111/jpy.70174","url":null,"abstract":"<p><p>Assembling high-quality genomes from underexplored environments can be helpful for understanding microbial diversity and identifying novel species. The Cyanobacterium type strain Capilliphycus salinus ALCB114379 is a representative of Oscillatoriales order isolated from a supralittoral zone of the south Atlantic Ocean in Brazil, an ecotone characterized by significant environmental fluctuations due to its transitional nature between the tidal and terrestrial environments. Here, we present its genome assembled into a single contig and circularized, with a total size of 7.7 Mb and 99.67% completeness. The genome has 6204 protein-coding genes, including several involved in the biosynthesis of secondary metabolites. Despite being a homocytous genus, C. salinus ALCB114379 possesses a gene cluster for the biosynthesis of molybdenum-type nitrogenase, indicating a potential for N<sub>2</sub> fixation. Additionally, the genome contains other gene clusters related to the biosynthesis of biotechnologically relevant compounds, such as microcyclamide (mca), a cytotoxic cyanopeptide, and mycosporine-like amino acids (MAAs), with photoprotective and antioxidant functions. High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) analysis showed the detectable production of three MAAs, with shinorine being the most abundantly produced compared with porphyra-334 and palythine. This work provides insights into the Cyanobacteria phylogenomics and metabolism, highlighting the potential of C. salinus ALCB114379 as a source of specific metabolites for biotechnological applications.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147856442","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
How do I publish the name of a new species of algae? A basic guide. 我如何发表一种新藻类的名字?基本指南。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-05-08 DOI: 10.1111/jpy.70172
Michael D Guiry
{"title":"How do I publish the name of a new species of algae? A basic guide.","authors":"Michael D Guiry","doi":"10.1111/jpy.70172","DOIUrl":"https://doi.org/10.1111/jpy.70172","url":null,"abstract":"<p><p>A basic guide to the requirements of the International Code of Nomenclature for algae, fungi, and plants for the publication of a valid name of new species (and infraspecific taxa) of living algae is provided. It is intended to aid phycologists so that an accurate inventory of the world's algal diversity is achieved. A checklist of actions necessary when preparing for publication of algae names is included.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147839381","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
Dominance and toxicity without lethality: Exploring biomass, cyanometabolites, and Daphnia responses across Cyanobacterial strains. 优势和毒性无致死性:探索生物量,氰代谢物,和水蚤对蓝藻菌株的反应。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-05-04 DOI: 10.1111/jpy.70173
Łukasz Wejnerowski, Tamara Dulić, Sultana Akter, Michał Rybak, Agnieszka Piasecka, Jakub Szymkowiak, Oskar Kamiński, Anna Czerepska, Filip Pniewski, Zorica Svirčev, Ewa Poniecka, Krzysztof Zawierucha, Katarzyna Taylor, Marcin Krzysztof Dziuba, Jussi Meriluoto
{"title":"Dominance and toxicity without lethality: Exploring biomass, cyanometabolites, and Daphnia responses across Cyanobacterial strains.","authors":"Łukasz Wejnerowski, Tamara Dulić, Sultana Akter, Michał Rybak, Agnieszka Piasecka, Jakub Szymkowiak, Oskar Kamiński, Anna Czerepska, Filip Pniewski, Zorica Svirčev, Ewa Poniecka, Krzysztof Zawierucha, Katarzyna Taylor, Marcin Krzysztof Dziuba, Jussi Meriluoto","doi":"10.1111/jpy.70173","DOIUrl":"https://doi.org/10.1111/jpy.70173","url":null,"abstract":"<p><p>Cyanobacteria are cosmopolitan, important components of biomass with a remarkable ability to synthesize a diverse array of bioactive compounds, some of which may have toxic effects on other organisms and ecosystems. In this study, filamentous cyanobacterial strains isolated predominantly from temperate European freshwaters (Aphanizomenon, Chrysosporum, Cuspidothrix, Dolichospermum, Planktothrix, Raphidiopsis), with a subset from Arctic waters (Microcoleus, Phormidesmis), were qualitatively screened for commonly studied cyanometabolites, using immunoassays and chromatographic techniques. We also assessed the effects of culture extracts and filtrates on the survival of Daphnia magna and Daphnia pulicaria. The results indicated a broad capacity among tested strains to produce toxic and bioactive compounds. Specifically, we detected anabaenopeptins, anatoxin-a, cylindrospermopsin, microcystins, and saxitoxins. Although numerous strains showed the potential to produce a variety of toxic and bioactive compounds and reached high biomass after 40 days of incubation, their extracts and filtrates frequently had negligible negative effects on the survival of Daphnia. In contrast, significant lethality was observed in response to planktic Limnothrix sp. and glacial Microcoelus autumnalis that tested negative for the studied compounds, as well as for an Aphanizomenon klebahnii strain in which only anabaenopeptins were detected. We also observed a positive relationship between the biomass used to prepare cyanobacterial extracts and Daphnia survival, and this result raises the question of whether there is a trade-off between the growth rates of strains and their toxicities. Our study extends the current knowledge of the geographical distribution of toxic cyanobacteria and suggests that some of them may also produce other, yet unidentified toxic compounds.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816545","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
Protein acetylation regulates the wound-induced asexual spore formation in Pyropia yezoensis. 蛋白乙酰化调控yezoensis伤口诱导的无性孢子形成。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-05-04 DOI: 10.1111/jpy.70171
Zehao Zhang, Wuxin You, Xiaowei Guan, Fugeng Tang, Ansgar Poetsch, Dongmei Wang
{"title":"Protein acetylation regulates the wound-induced asexual spore formation in Pyropia yezoensis.","authors":"Zehao Zhang, Wuxin You, Xiaowei Guan, Fugeng Tang, Ansgar Poetsch, Dongmei Wang","doi":"10.1111/jpy.70171","DOIUrl":"https://doi.org/10.1111/jpy.70171","url":null,"abstract":"<p><p>Lysine acetylation (LysAc) of proteins plays critical regulatory roles in a wide range of biological processes in both prokaryotes and eukaryotes. However, characteristics of LysAc and related proteins in red algae have not been investigated. In a marine aquaculture species Pyropia yezoensis, thallus cells form and release asexual spores under wound stress, and this process provides an essential source of seedlings in aquaculture. In order to elucidate the underlying regulatory mechanisms during spore formation, we performed a global acetylproteome analysis in both intact and wounded thalli. A total of 4647 LysAc sites were identified on 1398 proteins. Among them, 361 proteins exhibited differential acetylations (DAPs) at the time of sporangia formation and 382 at the time of spore maturation. Functional classification of all the DAPs revealed that they were primarily associated with central metabolic pathways, highlighting the importance of lysine acetylation in asexual spore formation. Particularly, >30 proteins related to photosynthesis and carbon fixation showed coordinated decline, consistent with the repressed photosynthetic efficiency after wounding. Starch was accumulated and the LysAc on the catalytic domain of starch synthase significantly increased during spore formation. Proteins related to cytoskeleton remodeling also had variations in LysAc, aligning with the observed depolymerization of microfilaments in spores. Our study provides not only fundamental information in protein acetylation in Pyropia as a prominent example for red seaweeds but also valuable insights on the post-translational regulation in wound-induced spore formation.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816610","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
Phytoplankton growth and potential cyanotoxin production differ in response to nitrogen and phosphorus amendments in late summer communities from Kabetogama Lake (Minnesota, United States). 在Kabetogama湖(美国明尼苏达州)的夏末群落中,浮游植物生长和潜在的蓝藻毒素产生对氮和磷修正的反应不同。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-05-02 DOI: 10.1111/jpy.70166
James H Larson, Ryan P Maki, Sean W Bailey, Victoria G Christensen, Keith A Loftin, Erin A Stelzer, James C Smith, Seth A McWhorter
{"title":"Phytoplankton growth and potential cyanotoxin production differ in response to nitrogen and phosphorus amendments in late summer communities from Kabetogama Lake (Minnesota, United States).","authors":"James H Larson, Ryan P Maki, Sean W Bailey, Victoria G Christensen, Keith A Loftin, Erin A Stelzer, James C Smith, Seth A McWhorter","doi":"10.1111/jpy.70166","DOIUrl":"https://doi.org/10.1111/jpy.70166","url":null,"abstract":"<p><p>Cyanotoxins such as microcystin (MC), cylindrospermopsin, and saxitoxin are secondary metabolites that are rich in nitrogen (N). Most cyanobacteria grow best on reduced inorganic N (ammonium, NH<sub>4</sub>), but when NH<sub>4</sub> is absent, cyanobacteria can activate physiological pathways to process other N forms (e.g., nitrate; NO<sub>3</sub>). Studies on some cyanobacterial cultures have indicated that expression of N stress response genes is associated with MC gene expression. If accurate, NH<sub>4</sub> additions could reduce N stress and therefore cyanotoxin production. Lakes experiencing changes in N form and supply could thus experience changes in cyanobacterial toxicity independent of shifts in abundance. We performed nutrient amendments on phytoplankton communities from Kabetogama Lake (Minnesota, United States) over 2 years (four experiments total), to assess the role of N and phosphorus amendments on growth and toxicity of phytoplankton. Natural communities were collected during cyanobacterial blooms and exposed to short laboratory experiments with amendments of NH<sub>4</sub>, NO<sub>3</sub>, orthophosphate, or a combination of all three. In three of four experiments, biomass responses were consistent with N-limitation based on chlorophyll a or biovolume estimates. In experiments with evidence for N-limited growth, MC gene expression was lower in NH<sub>4</sub> treatments than in the control in 2021 but higher than in the control in 2022. The proportion of heterocytes (specialized cells for N fixation) was positively correlated with MC gene expression. These experiments reinforce the strong connection between N physiology and MC gene expression, but variation in taxonomic composition within genera or even species remains a possible cause of inconsistency in whole-community responses.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816519","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
Molecular mechanisms, metabolic remodeling, and energy reallocation underlying calcification in the coccolithophore Gephyrocapsa huxleyi. 球石藻钙化的分子机制、代谢重塑和能量再分配。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-04-30 DOI: 10.1111/jpy.70170
Cong Wang, Yan Liu, Guanjia Lin, Xinyu Deng, Senjie Lin, Nianzhi Jiao
{"title":"Molecular mechanisms, metabolic remodeling, and energy reallocation underlying calcification in the coccolithophore Gephyrocapsa huxleyi.","authors":"Cong Wang, Yan Liu, Guanjia Lin, Xinyu Deng, Senjie Lin, Nianzhi Jiao","doi":"10.1111/jpy.70170","DOIUrl":"https://doi.org/10.1111/jpy.70170","url":null,"abstract":"<p><p>Coccolithophores play a dual role in the marine carbon cycle, serving as CO<sub>2</sub> sinks through photosynthesis while simultaneously emitting CO<sub>2</sub> via calcification, resulting in uncertainty regarding their net carbon sequestration potential. In addition, their calcite coccoliths (CaCO<sub>3</sub>) can increase the carbon export efficiency by functioning as ballasts for organic matter. Although biogeochemically significant, the molecular mechanisms governing calcification and associated metabolic adaptations in coccolithophores remain poorly characterized, impeding accurate predictions of their responses to climate change. Through comparative multiomics analyses of calcified (RCC1266) and noncalcified (PML B92/11) Gephyrocapsa huxleyi strains, as well as chemically induced decalcified and recalcified states, we screened several ion transport genes, which potentially facilitate Ca<sup>2+</sup> and HCO<sub>3</sub> <sup>-</sup> uptake/transport coupled with H<sup>+</sup> extrusion during calcification in the calcified strain, along with their associated proteins, including signal molecules and chaperones. Furthermore, an energy-intensive process was observed in calcifying cells, and this process was principally sustained by enhanced photosynthetic efficiency, supplemented by glucose accumulation as an energy reserve and COX6B translational upregulation, providing nocturnal energy. Notably, calcifying cells employed an energy conservation strategy characterized by transcriptional downregulation yet translational maintenance of photosynthesis and carbon metabolism genes while simultaneously upregulating protein biosynthesis and trafficking pathways to probably meet calcification demands, a process potentially facilitated by increased glutamine biosynthesis. Through multiomic technology, our findings provide insights into the molecular adaptations in the calcified coccolithophorid cells, revealing critical physiological trade-offs, carbon metabolism, and energy allocation that can inform predictions of their acclimation capacity under changing oceanic conditions.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147774733","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
Novel Hydrurus species (Chrysophyceae) and their adaptations to high-altitude European and Arctic snowfields. 新水螅属植物及其对高海拔欧洲和北极雪原的适应。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-04-29 DOI: 10.1111/jpy.70162
Lenka Procházková, Robert A Andersen, Thomas Leya, Tomáš Řezanka, Martin Lukeš, Linda Nedbalová, Daniel Remias
{"title":"Novel Hydrurus species (Chrysophyceae) and their adaptations to high-altitude European and Arctic snowfields.","authors":"Lenka Procházková, Robert A Andersen, Thomas Leya, Tomáš Řezanka, Martin Lukeš, Linda Nedbalová, Daniel Remias","doi":"10.1111/jpy.70162","DOIUrl":"https://doi.org/10.1111/jpy.70162","url":null,"abstract":"<p><p>Colored snow caused by green algae (Chlorophyceae) is well known, but melting snowpacks can also harbor golden-brown blooms consisting of Chrysophyceae. We collected 14 samples of cryoflora in the Austrian and Swiss Alps, the High Tatras in Slovakia, and in Arctic Svalbard. Eight laboratory unicellular flagellated strains were established from eight sites and phylogenetic analyses (18S rRNA and rbcL gene sequences) revealed new taxa belonging to the order Hydrurales (Chrysophyceae). Some formed tetrahedral swarmers; others were capsoid or amoeboid forms. Characteristics of vegetative cells and molecular markers, including the ITS2 rRNA region, supported the description of eight species: Hydrurus novisii sp. nov., H. klavenessii sp. nov., H. tatrae sp. nov., H. pulcher sp. nov., H. pascheri sp. nov., H. svalbardensis sp. nov., H. nivalis sp. nov. and H. nemcovae sp. nov. Pulse-amplitude-modulate (PAM) fluorometry indicated that the photosystem II of Arctic populations was adapted to high light conditions. Abundant polyunsaturated fatty acids supported cell survival at temperatures around 0°C, and the composition of these acids differed among species. The cells contained compatible solutes that could act as antifreeze agents. The main carotenoid fucoxanthin caused the overall golden-brown pigmentation. The closest relatives of the new species were reported from snow and cold mountain streams and lakes, indicating that these Hydruralian microalgae prefer low temperatures and elevated irradiation. The large number of new species discovered during this limited sampling campaign suggests the underestimated diversity of phototrophic microbes in melting snow. Consequently, the genus Hydrurus shows a similar high relevance for snow algae blooms as Chloromonas does within the green algae.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147774690","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
Are integrative systematic tools efficient toward unraveling species diversity with the genus Jania (Corallinaceae, Rhodophyta)? 综合系统工具对揭示Jania属(珊瑚科,红藻科)的物种多样性有效吗?
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-04-29 DOI: 10.1111/jpy.70167
Clio Maridakis, Viviana Peña Freire, Gilberto Marani, Maria Tarin Sancho, Line Le Gall, Florence Rousseau
{"title":"Are integrative systematic tools efficient toward unraveling species diversity with the genus Jania (Corallinaceae, Rhodophyta)?","authors":"Clio Maridakis, Viviana Peña Freire, Gilberto Marani, Maria Tarin Sancho, Line Le Gall, Florence Rousseau","doi":"10.1111/jpy.70167","DOIUrl":"https://doi.org/10.1111/jpy.70167","url":null,"abstract":"<p><p>The articulated genus Jania currently comprises 54 accepted species, making it the fourth most speciose genus among corallines, following Lithophyllum, Amphiroa, and Lithothamnion. Unlike these other genera, Jania is relatively easy to identify at a generic rank. However, morpho-anatomical characters are insufficiently discriminant for species identification, making DNA sequences essential for reliable species delimitation. We evaluated species diversity within Jania using the most comprehensive sampling to date, spanning a broad geographic range with a focus on the Mediterranean and Caribbean regions. Our data set comprised 186 specimens from the National Herbarium of the Muséum national d'Histoire naturelle (PC), including four type specimens with the basionyms Jania micrarthrodia, Corallina polydactyla, Corallina mauritiana, and Jania digitata. We also incorporated publicly available sequences from GenBank and Barcode of Life Data System (BOLD) to delimit species and infer their phylogenetic relationships using the psbA and COI genes. Through an integrative taxonomic approach, combining morpho-anatomical traits, molecular systematics, and biogeography, we delineated 39 putative species-28% fewer than the currently accepted number. Most of the putative species had a restricted distribution, whereas five were widely distributed. We determined seven species from the European Atlantic and Mediterranean seas and six from the Caribbean. Furthermore, we demonstrated that intergenicular morphometry is an unreliable trait for species identification, highlighting the morphological plasticity of Jania. Many putative species remained unidentified (67%), while some of those putative species included specimens with different identifications. Additional sequences of type specimens would be crucial for further resolving taxonomy and bridging the gap between type-bearing name and putative species delineated based on molecular data.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147774692","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
Epitypification of Merismopedia tranquilla (Cyanobacteria) prompts phylogenetic reassessment of the genus and the description of two morphologically similar genera. 蓝藻门的分类提示了该属的系统发育重新评估和两个形态相似属的描述。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-04-29 DOI: 10.1111/jpy.70169
Jan Pokorný, Jan Kaštovský, Lenka Marešová Štenclová
{"title":"Epitypification of Merismopedia tranquilla (Cyanobacteria) prompts phylogenetic reassessment of the genus and the description of two morphologically similar genera.","authors":"Jan Pokorný, Jan Kaštovský, Lenka Marešová Štenclová","doi":"10.1111/jpy.70169","DOIUrl":"https://doi.org/10.1111/jpy.70169","url":null,"abstract":"<p><p>The genus Merismopedia is morphologically characterized by its distinctive colony arrangement yet exhibits considerable variability among species. Recent studies suggested that Merismopedia is polyphyletic, and its most likely true lineage was provisionally placed within the Microcystaceae. However, the available molecular data for most of the extant species were scarce, and notably, its type species, Me. tranquilla, lacked contemporary distributional and molecular data. In the present study, we sampled multiple localities to capture the potential morphological and genetic variability within Merismopedia. Using culture-dependent and -independent methods, we collected an extensive dataset of 16S rRNA gene and 16S-23S ITS rRNA region sequences. This dataset included the type locality of Me. tranquilla, from which we successfully recovered morphologically authentic isolates and established an epitype. Subsequent phylogenetic analyses of Merismopedia- and Microcrocis-like taxa revealed the placement of Merismopedia sensu stricto within the Geminocystaceae, herein reinstated to Merismopediaceae and further confirmed extensive polyphyly. Based on these findings, we propose two new genera (Neomerismopedia and Planktopedia), and a new species, Me. sepulta. Additionally, we transfer Microcrocis gigas to Merismopedia. We proposed the provisional transfer of Me. hyalina to Synechocystis; however, further revision is needed. These taxonomic revisions provide a foundation for a comprehensive reevaluation of this widespread and morphologically diverse group of Cyanobacteria.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147774735","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
Seasonal succession and niche differentiation in Skeletonema species driven by temperature and salinity in inner Tokyo Bay. 东京湾内温度和盐度驱动下骨骼鱼物种的季节演替和生态位分化。
IF 3.4 3区 生物学
Journal of Phycology Pub Date : 2026-04-24 DOI: 10.1111/jpy.70168
Toshiya Katano, Tomohiro Suematsu, Ayane Tanaka, Saori Yasui-Tamura, Fuminori Hashihama
{"title":"Seasonal succession and niche differentiation in Skeletonema species driven by temperature and salinity in inner Tokyo Bay.","authors":"Toshiya Katano, Tomohiro Suematsu, Ayane Tanaka, Saori Yasui-Tamura, Fuminori Hashihama","doi":"10.1111/jpy.70168","DOIUrl":"https://doi.org/10.1111/jpy.70168","url":null,"abstract":"<p><p>The genus Skeletonema is a dominant diatom in coastal waters worldwide, frequently causing blooms, and it includes several cryptic species. To elucidate the occurrence patterns and niche differentiation among Skeletonema species in Tokyo Bay, Japan, sampling was conducted between June 2021 and February 2023. Species composition and abundance were determined using species-specific quantitative polymerase chain reaction (qPCR) and were analyzed using an environmental framework in temperature, salinity, and nutrient concentrations. Niche characteristics were determined using outlying mean index (OMI) analysis, focusing on five frequently detected species: S. ardens, S. marinoi-dohrnii complex, S. menzelii, S. potamos, and S. japonicum. Seasonal succession was evident, wherein S. japonicum predominated in winter, followed by the S. marinoi-dohrnii complex in spring and S. menzelii, S. ardens, and S. potamos in summer. Principal component analysis indicated that S. japonicum was associated with low temperature and high salinity, whereas other frequently detected species were positively correlated with temperature. The OMI analysis revealed that niche breadth differed among species, with S. potamos, S. marinoi-dohrnii complex, and S. menzelii showing a wide niche breadth and S. ardens and S. japonicum being specialists. Marginality was highest for S. potamos, indicating an association with low salinity, but it was lowest for S. japonicum due to a high frequency of high-salinity conditions. This study demonstrated that (1) seasonal succession in the bay is primarily structured by associations with temperature and salinity but (2) niche partitioning is not always clear. When the environment was highly disturbed in the summer rainy season, more than two Skeletonema species frequently co-occurred, suggesting potential competition for nutrients.</p>","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147774672","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}
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