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Variability in spectral absorption within cryptophyte phycobiliprotein types J. Phycol. (IF 2.9) Pub Date : 2024-03-08 Kristiaän A. Merritt, Tammi L. Richardson
Cryptophytes are known to vary widely in coloration among species. These differences in color arise primarily from the presence of phycobiliprotein accessory pigments. There are nine defined cryptophyte phycobiliprotein (Cr-PBP) types, named for their wavelength of maximal absorbance. Because Cr-PBP type has traditionally been regarded as a categorical trait, there is a paucity of information about
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Divide and conquer: Spatial and temporal resource partitioning structures benthic cyanobacterial mats J. Phycol. (IF 2.9) Pub Date : 2024-03-12 Maya E. Powell, Sophie J. McCoy
Benthic cyanobacterial mats are increasing in abundance worldwide with the potential to degrade ecosystem structure and function. Understanding mat community dynamics is thus critical for predicting mat growth and proliferation and for mitigating any associated negative effects. Carbon, nitrogen, and sulfur cycling are the predominant forms of nutrient cycling discussed within the literature, while
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Exogenous 24‐epibrassinolide (EBL) facilitates cell growth of Chlorella pyrenoidosa under high temperatures by enhancing the photosynthetic energy utilization and alleviating oxidative damage J. Phycol. (IF 2.9) Pub Date : 2024-03-07 Fang Su, Yongfu Li
The microalga Chlorella pyrenoidosa is cultivated extensively for its constituents, which are of significant economic worth. Large‐scale growth of C. pyrenoidosa in outdoor environments is subject to various stressors such as elevated temperature. The purpose of this study was to assess the protective effects of exogenous 24‐epibrassinolide (EBL) on C. pyrenoidosa under high‐temperature conditions
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Transcriptional responses to salinity‐induced changes in cell wall morphology of the euryhaline diatom Pleurosira laevis J. Phycol. (IF 2.9) Pub Date : 2024-03-06 Shiho Kamakura, Gust Bilcke, Shinya Sato
Diatoms are unicellular algae with morphologically diverse silica cell walls, which are called frustules. The mechanism of frustule morphogenesis has attracted attention in biology and nanomaterials engineering. However, the genetic regulation of the morphology remains unclear. We therefore used transcriptome sequencing to search for genes involved in frustule morphology in the centric diatom Pleurosira
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Rosetta gen. nov. (Chlorophyta): Resolving the identity of red snow algal rosettes J. Phycol. (IF 2.9) Pub Date : 2024-03-05 Casey B. Engstrom, Breanna B. Raymond, Joud Albeitshawish, Anastasia Bogdanovic, Lynne M. Quarmby
Thick‐walled rosette‐like snow algae were long thought to be a life stage of various other species of snow algae. Rosette‐like cells have not been cultured, but by manually isolating cells from 38 field samples in southern British Columbia, we assigned a variety of rosette morphologies to DNA sequence. Phylogenetic analysis of Rubisco large‐subunit (rbcL) gene, ribosomal internal transcribed spacer
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The chloroplast and mitochondrial genomes of two Gomphonema parvulum (Bacillariophyta) environmental isolates from South Carolina (United States) and Virginia (United States) J. Phycol. (IF 2.9) Pub Date : 2024-03-04 A. Bruce Cahoon, Katherine M. Johnson, Sydney M. Brown, Kalina M. Manoylov, James A. Nienow
Gomphonema parvulum is a cosmopolitan freshwater diatom that is used as an indicator in water quality biomonitoring. In this study, we report the culturing of two geographically separated isolates from southeastern North America, their morphology, and the sequencing and assembly of their mitochondrial and chloroplast genomes. Morphologically, both strains fit G. parvulum sensu lato, but the frustules
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The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot J. Phycol. (IF 2.9) Pub Date : 2024-03-01 Cody James, Cayne Layton, Catriona L. Hurd, Damon Britton
Kelps are in global decline due to climate change, which includes ocean warming. To identify vulnerable species, we need to identify their tolerances to increasing temperatures and determine whether tolerances are altered by co‐occurring drivers such as inorganic nutrient levels. This is particularly important for those species with restricted distributions, which may already be experiencing thermal
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Tropical bloom‐forming mesoalgae Cladophoropsis sp. and Laurencia sp.—responses to ammonium enrichment and a simulated heatwave J. Phycol. (IF 2.9) Pub Date : 2024-02-25 Anna Fricke, Felix Bast, Agustín Moreira‐Saporiti, Giovanni Martins Bussanello, Flower E. Msuya, Mirta Teichberg
Algal blooms are increasing worldwide, driven by elevated nutrient inputs. However, it is still unknown how tropical benthic algae will respond to heatwaves, which are expected to be more frequent under global warming. In the present study, a multifactorial experiment was carried out to investigate the potential synergistic effects of increased ammonium inputs (25 μM, control at 2.5 μM) and a heatwave
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Ecophysiological and genomic approaches to cyanobacterial hardening for restoration J. Phycol. (IF 2.9) Pub Date : 2024-02-19 Beatriz Roncero‐Ramos, Valentina Savaglia, Benoit Durieu, Isabelle Van de Vreken, Aurore Richel, Annick Wilmotte
Cyanobacteria inhabit extreme environments, including drylands, providing multiple benefits to the ecosystem. Soil degradation in warm drylands is increasing due to land use intensification. Restoration methods adapted to the extreme stress in drylands are being developed, such as cyanobacteria inoculation to recover biocrusts. For this type of restoration method to be a success, it is crucial to optimize
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Igniting taxonomic curiosity: The amazing story of Amazonocrinis with the description of a new genus Ahomia gen. nov. and novel species of Ahomia, Amazonocrinis, and Dendronalium from the biodiversity-rich northeast region of India J. Phycol. (IF 2.9) Pub Date : 2024-02-11 Sagarika Pal, Aniket Saraf, Naresh Kumar, Prashant Singh
Five cyanobacterial strains exhibiting Nostoc-like morphology were sampled from the biodiversity hotspots of the northeast region of India and characterized using a polyphasic approach. Molecular and phylogenetic analysis using the 16S rRNA gene indicated that the strains belonged to the genera Amazonocrinis and Dendronalium. In the present investigation, the 16S rRNA gene phylogeny clearly demarcated
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French Polynesian Scytosiphonaceae (Ectocarpales, Phaeophyceae): A combined molecular and morphological approach to their diversity and systematics J. Phycol. (IF 2.9) Pub Date : 2024-02-04 Christophe Vieira, Myung Sook Kim, Mayalen Zubia
This study revisited the taxonomy and diversity of brown macroalgae within the Scytosiphonaceae family in French Polynesia, which had previously been recognized as encompassing only six species. Using the chloroplast and mitochondrial genes rbcL, psbA, and cox3 as molecular markers in conjunction with morpho-anatomical observations, we unveiled the presence of 11 species spanning six genera: Chnoospora
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Organellar genomic characterization of Anunuuluaehu liula representing a new genus and species of Phyllophoraceae (Gigartinales, Rhodophyta) from the mesophotic zone of Hawai‘i J. Phycol. (IF 2.9) Pub Date : 2024-01-30 Feresa P. Cabrera, Monica O. Paiano, James T. Fumo, Kazumi R. Allsopp, Celia M. Smith, Heather L. Spalding, Randall K. Kosaki, Alison R. Sherwood
Over the last 2 decades, routine collections in the Hawaiian Archipelago have expanded to mesophotic reefs, leading to the discovery of a new red algal genus and species, here described as Anunuuluaehu liula gen. et sp. nov. This study provides a detailed genus and species description and characterizes chloroplast and mitochondrial organellar genomes. The new genus, Anunuuluaehu, shares many characteristics
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Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves J. Phycol. (IF 2.9) Pub Date : 2024-01-24 Antonella C. Almeida-Saá, Schery Umanzor, Jose Antonio Zertuche-González, Ricardo Cruz-López, Raquel Muñiz-Salazar, Alejandra Ferreira-Arrieta, Paula Bonet Melià, Jessica Anayansi García-Pantoja, Laura K. Rangel-Mendoza, Manuel Vivanco-Bercovich, Leonardo Ruiz-Montoya, Jose Manuel Guzmán-Calderón, Jose Miguel Sandoval-Gil
Kelp communities are experiencing exacerbated heat-related impacts from more intense, frequent, and deeper marine heatwaves (MHWs), imperiling the long-term survival of kelp forests in the climate change scenario. The occurrence of deep thermal anomalies is of critical importance, as elevated temperatures can impact kelp populations across their entire bathymetric range. This study evaluates the impact
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How many species of algae are there? A reprise. Four kingdoms, 14 phyla, 63 classes and still growing J. Phycol. (IF 2.9) Pub Date : 2024-01-21 Michael D. Guiry
To date (1 November 2023), the online database AlgaeBase has documented 50,589 species of living algae and 10,556 fossil species here referred to four kingdoms (Eubacteria, Chromista, Plantae, and Protozoa), 14 phyla, and 63 classes. The algae are the third most speciose grouping of plant-like after the flowering plants (≈382,000 species) and fungi (≈170,000 species, including lichens) but are the
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Taxonomy and nomenclature of Oophila amblystomatis (Chlorophyceae, Chlamydomonadales) J. Phycol. (IF 2.9) Pub Date : 2024-01-15 Cory D. Bishop, David J. Garbary
The unicellular green alga Oophila amblystomatis was named by Lambert in 1905 based upon its association with egg masses of the spotted salamander Ambystoma maculatum. We collected algal cells from Lambert's original egg capsule preparations that were contributed to Phycotheca Boreali-Americana (PBA) in 1905 and subjected them to DNA extraction and PCR with O. amblystomatis-specific 18S rRNA gene primers
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Elemental and macromolecular plasticity of Chlamydomonas reinhardtii (Chlorophyta) in response to resource limitation and growth rate J. Phycol. (IF 2.9) Pub Date : 2024-01-10 Jana Isanta-Navarro, Logan M. Peoples, Benedicta Bras, Matthew J. Church, James J. Elser
With the ongoing differential disruption of the biogeochemical cycles of major elements that are essential for all life (carbon, nitrogen, and phosphorus), organisms are increasingly faced with a heterogenous supply of these elements in nature. Given that photosynthetic primary producers form the base of aquatic food webs, impacts of changed elemental supply on these organisms are particularly important
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Gansulinema gen. nov. and Komarkovaeasiopsis gen. nov.: Novel Oculatellacean genera (Cyanobacteria) isolated from desert soils and hot spring J. Phycol. (IF 2.9) Pub Date : 2024-01-10 Fangfang Cai, Shuheng Li, Jiaxin Chen, Renhui Li
To increase the understanding of simple thin filamentous cyanobacteria in harsh environmental areas, we previously isolated and identified four strains (XN101, XN102, GS121, NX122) from desert soils and hot spring in China. As a result, two new Oculatellacean genera of these four strains, Gansulinema gen. nov. and Komarkovaeasiopsis gen. nov., are described based on a polyphasic approach. The ultrastructure
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Antiviral discovery in toxic cyanobacteria: Low hanging fruit in the age of pandemics J. Phycol. (IF 2.9) Pub Date : 2024-01-04 Sally Zheng, Victoria Lee, Isaac Meza-Padilla, Jozef I. Nissimov
The power of novel vaccination technologies and their rapid development were elucidated clearly during the COVID-19 pandemic. At the same time, it also became clear that there is an urgent need to discover and manufacture new antivirals that target emerging viral threats. Toxic species of cyanobacteria produce a range of bioactive compounds that makes them good candidates for drug discovery. Nevertheless
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Characterization of polyphosphate dynamics in the widespread freshwater diatom Achnanthidium minutissimum under varying phosphorus supplies J. Phycol. (IF 2.9) Pub Date : 2024-01-01 Adrien Lapointe, Mustafa Kocademir, Paavo Bergman, Imaiyan Chitra Ragupathy, Michael Laumann, Graham J. C. Underwood, Andreas Zumbusch, Dieter Spiteller, Peter G. Kroth
Polyphosphates (polyP) are ubiquitous biomolecules that play a multitude of physiological roles in many cells. We have studied the presence and role of polyP in a unicellular alga, the freshwater diatom Achnanthidium minutissimum. This diatom stores up to 2.0 pg·cell−1 of polyP, with chain lengths ranging from 130 to 500 inorganic phosphate units (Pi). We applied energy dispersive X-ray spectroscopy
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Distinct regulation of two flagella by calcium during chemotaxis of male gametes in the brown alga Mutimo cylindricus (Cutleriaceae, Tilopteridales) J. Phycol. (IF 2.9) Pub Date : 2023-12-30 Nana Kinoshita-Terauchi, Kogiku Shiba, Taiki Umezawa, Kazuo Inaba
Brown algal male gametes show chemotaxis to the sex pheromone that is released from female gametes. The chemotactic behavior of the male gametes is controlled by the changes in the beating of two flagella known as the anterior and posterior flagellum. Our previous study using Mutimo cylindricus showed that the sex pheromone induced an increment in both the deflection angle of the anterior flagellum
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Identification of reproductive sex-biased gene expression in Asparagopsis taxiformis (lineage 6) gametophytes J. Phycol. (IF 2.9) Pub Date : 2023-12-29 Zubaida Parveen Patwary, Min Zhao, Nicholas A. Paul, Scott F. Cummins
The sub-tropical red seaweed Asparagopsis taxiformis is of significant interest due to its ability to store halogenated compounds, including bromoform, which can mitigate methane production in ruminants. Significant scale-up of aquaculture production of this seaweed is required; however, relatively little is known about the molecular mechanisms that control fundamental physiological processes, including
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Insights into the chaotropic tolerance of the desert cyanobacterium Chroococcidiopsis sp. 029 (Chroococcidiopsales, Cyanobacteria) J. Phycol. (IF 2.9) Pub Date : 2023-12-29 Claudia Fagliarone, Beatriz Gallego Fernandez, Giorgia Di Stefano, Claudia Mosca, Daniela Billi
The mechanism of perchlorate resistance of the desert cyanobacterium Chroococcidiopsis sp. CCMEE 029 was investigated by assessing whether the pathways associated with its desiccation tolerance might play a role against the destabilizing effects of this chaotropic agent. During 3 weeks of growth in the presence of 2.4 mM perchlorate, an upregulation of trehalose and sucrose biosynthetic pathways was
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Kelp and sea urchin settlement mediated by biotic interactions with benthic coralline algal species J. Phycol. (IF 2.9) Pub Date : 2023-12-26 Brenton A. Twist, Florent Mazel, Stefanie Zaklan Duff, Matthew A. Lemay, Christopher M. Pearce, Patrick T. Martone
Species interactions can influence key ecological processes that support community assembly and composition. For example, coralline algae encompass extensive diversity and may play a major role in regime shifts from kelp forests to urchin-dominated barrens through their role in inducing invertebrate larval metamorphosis and influencing kelp spore settlement. In a series of laboratory experiments, we
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Environment-dependent metabolic investments in the mixotrophic chrysophyte Ochromonas J. Phycol. (IF 2.9) Pub Date : 2023-12-23 Gina S. Barbaglia, Christopher Paight, Meredith Honig, Matthew D. Johnson, Ryan Marczak, Michelle Lepori-Bui, Holly V. Moeller
Mixotrophic protists combine photosynthesis and phagotrophy to obtain energy and nutrients. Because mixotrophs can act as either primary producers or consumers, they have a complex role in marine food webs and biogeochemical cycles. Many mixotrophs are also phenotypically plastic and can adjust their metabolic investments in response to resource availability. Thus, a single species's ecological role
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The requirement for external carbonic anhydrase in diatoms is influenced by the supply and demand for dissolved inorganic carbon J. Phycol. (IF 2.9) Pub Date : 2023-12-21 Matthew Keys, Brian Hopkinson, Andrea Highfield, Abdul Chrachri, Colin Brownlee, Glen L. Wheeler
Photosynthesis by marine diatoms contributes significantly to the global carbon cycle. Due to the low concentration of CO2 in seawater, many diatoms use extracellular carbonic anhydrase (eCA) to enhance the supply of CO2 to the cell surface. While much research has investigated how the requirement for eCA is influenced by changes in CO2 availability, little is known about how eCA contributes to CO2
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Kelps on demand: Closed-system protocols for culturing large bull kelp sporophytes for research and restoration J. Phycol. (IF 2.9) Pub Date : 2023-12-15 Varoon P. Supratya, Patrick T. Martone
Culturing kelps for commercial, conservation, and scientific purposes is becoming increasingly widespread. However, kelp aquaculture methods are typically designed for ocean-based farms, and these methods may not be applicable for smaller scale cultivation efforts common in research and restoration. Growing kelps in closed, recirculating culture systems may address many of these constraints, yet closed
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Antagonistic actions of Paucibacter aquatile B51 and its lasso peptide paucinodin toward cyanobacterial bloom-forming Microcystis aeruginosa PCC7806 J. Phycol. (IF 2.9) Pub Date : 2023-12-10 Yeji Cha, Wonjae Kim, Yerim Park, Minkyung Kim, Yongjun Son, Woojun Park
Superior antagonistic activity against axenic Microcystis aeruginosa PCC7806 was observed with Paucibacter sp. B51 isolated from cyanobacterial bloom samples among 43 tested freshwater bacterial species. Complete genome sequencing, analyzing average nucleotide identity and digital DNA–DNA hybridization, designated the B51 strain as Paucibacter aquatile. Electron and fluorescence microscopic image analyses
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Description of six new cyanobacterial species from soil biocrusts on San Nicolas Island, California, in three genera previously restricted to Brazil J. Phycol. (IF 2.9) Pub Date : 2023-12-09 Brian M. Jusko, Jeffrey R. Johansen
As the taxonomic knowledge of cyanobacteria from terrestrial environments increases, it remains important to analyze biodiversity in areas that have been understudied to fully understand global and endemic diversity. This study was completed as part of a larger algal biodiversity study of the soil biocrusts of San Nicholas Island, California, USA. Among the taxa isolated were several new species in
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Algae in the Anthropocene: Managing, conserving, and utilizing algae in an era of rapid environmental change J. Phycol. (IF 2.9) Pub Date : 2023-11-27 Melinda A. Coleman
The Anthropocene is defined as the current period in which humans have had a large influence over the status and trajectory of earth's climate and environment. Human-induced climate change, pollution, and coastal development have caused major changes to algal persistence, distribution, diversity, and function. This has not only brought new challenges for managing and conserving algae, but also new
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Microscopic image recognition of diatoms based on deep learning J. Phycol. (IF 2.9) Pub Date : 2023-11-23 Siyue Pu, Fan Zhang, Yuexuan Shu, Weiqi Fu
Diatoms are a crucial component in the study of aquatic ecosystems and ancient environmental records. However, traditional methods for identifying diatoms, such as morphological taxonomy and molecular detection, are costly, are time consuming, and have limitations. To address these issues, we developed an extensive collection of diatom images, consisting of 7983 images from 160 genera and 1042 species
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Gephyrocapsa huxleyi (Emiliania huxleyi) as a model system for coccolithophore biology J. Phycol. (IF 2.9) Pub Date : 2023-11-20 Glen L. Wheeler, Daniela Sturm, Gerald Langer
Coccolithophores are the most abundant calcifying organisms in modern oceans and are important primary producers in many marine ecosystems. Their ability to generate a cellular covering of calcium carbonate plates (coccoliths) plays a major role in marine biogeochemistry and the global carbon cycle. Coccolithophores also play an important role in sulfur cycling through the production of the climate-active
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Phaeodactylum tricornutum: An established model species for diatom molecular research and an emerging chassis for algal synthetic biology J. Phycol. (IF 2.9) Pub Date : 2023-11-17 Monia T. Russo, Alessandra Rogato, Marianne Jaubert, Bogumil J. Karas, Angela Falciatore
Diatoms are prominent and highly diverse microalgae in aquatic environments. Compared with other diatom species, Phaeodactylum tricornutum is an “atypical diatom” displaying three different morphotypes and lacking the usual silica shell. Despite being of limited ecological relevance, its ease of growth in the laboratory and well-known physiology, alongside the steady increase in genome-enabled information
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Primary production of the kelp Lessonia corrugata varies with season and water motion: Implications for coastal carbon cycling J. Phycol. (IF 2.9) Pub Date : 2023-11-15 Allyson E. Nardelli, Wouter Visch, Glenn Farrington, J. Craig Sanderson, Alecia Bellgrove, Jeffrey T. Wright, Catriona Macleod, Catriona L. Hurd
Kelp forests provide vital ecosystem services such as carbon storage and cycling, and understanding primary production dynamics regarding seasonal and spatial variations is essential. We conducted surveys at three sites in southeast Tasmania, Australia, that had different levels of water motion, across four seasons to determine seasonal primary production and carbon storage as living biomass for kelp
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The eco-evolutionary importance of reproductive system variation in the macroalgae: Freshwater reds as a case study J. Phycol. (IF 2.9) Pub Date : 2023-11-10 Stacy A. Krueger-Hadfield, Sarah J. Shainker-Connelly, Roseanna M. Crowell, Morgan L. Vis
The relative frequency of sexual versus asexual reproduction governs the distribution of genetic diversity within and among populations. Most studies on the consequences of reproductive variation focus on the mating system (i.e., selfing vs. outcrossing) of diploid-dominant taxa (e.g., angiosperms), often ignoring asexual reproduction. Although reproductive systems are hypothesized to be correlated
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Air-sea carbon dioxide equilibrium: Will it be possible to use seaweeds for carbon removal offsets? J. Phycol. (IF 2.9) Pub Date : 2023-11-09 C. L. Hurd, J.-P. Gattuso, P. W. Boyd
To limit global warming below 2°C by 2100, we must drastically reduce greenhouse gas emissions and additionally remove ~100–900 Gt CO2 from the atmosphere (carbon dioxide removal, CDR) to compensate for unavoidable emissions. Seaweeds (marine macroalgae) naturally grow in coastal regions worldwide where they are crucial for primary production and carbon cycling. They are being considered as a biological
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Thermal performance curves identify seasonal and site-specific variation in the development of Ecklonia radiata (Phaeophyceae) gametophytes and sporophytes J. Phycol. (IF 2.9) Pub Date : 2023-10-28 Jakop Schwoerbel, Wouter Visch, Jeffrey T. Wright, Alecia Bellgrove, J. Craig Sanderson, Catriona L. Hurd
Rapid ocean warming is affecting kelp forests globally. While the sporophyte life stage has been well studied for many species, the microscopic life stages of laminarian kelps have been understudied, particularly regarding spatial and temporal variations in thermal tolerance and their interaction. We investigated the thermal tolerance of growth, survival, development, and fertilization of Ecklonia
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Resolving the taxonomy of the Polysiphonia scopulorum complex and the Bryocladia lineage (Rhodomelaceae, Rhodophyta) J. Phycol. (IF 2.9) Pub Date : 2023-10-25 Pilar Díaz-Tapia, Heroen Verbruggen
Cryptic diversity is common among marine macroalgae, with molecular tools leading to the discovery of many new species. To assign names to these morphologically similar species, the type and synonyms have to be examined, and if appropriate, new species must be described. The turf-forming red alga Polysiphonia scopulorum was originally described from Rottnest Island, Australia, and subsequently widely
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Description of two new species of Nostoc (Nostocales, Cyanobacteria) from central Mexico, using morphological, ecological, and molecular attributes J. Phycol. (IF 2.9) Pub Date : 2023-10-27 Javier Carmona Jiménez, Angela Caro Borrero, Itzel Becerra-Absalón, Elvira Perona Urizar, Kenia Márquez Santamaría, Pilar Mateo Ortega
The present study describes two new Nostoc species, N. montejanii and N. tlalocii, based on a polyphasic approach that combines morphological, ecological, and genetic characteristics. The five investigated populations, including those from newly collected material from central Mexico, were observed to possess morphological features characteristic of the Nostoc genus. Results showed that both new species
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Investigating seed bank potential of crustose coralline algae using DNA metabarcoding J. Phycol. (IF 2.9) Pub Date : 2023-10-21 Aimee L. van der Reis, Mary A. Sewell, Wendy A. Nelson
To examine the potential for the autogenic ecosystem engineers, crustose coralline algae (CCA), to serve as seed banks or refugia for life stages of other species, it is critical to develop sampling protocols that reflect the diversity of life present. In this pilot study on two shallow water species of CCA collected from Raoul Island (Kermadec Islands; Rangitāhua) New Zealand, we investigated two
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Responses of the desert green algae, Chlorella sp. to drought stress J. Phycol. (IF 2.9) Pub Date : 2023-10-21 Bo Wang, Xiaoyan Li, Gaohong Wang
Desert algae are important components of the desert soil crust and play an essential role in desert soil ecosystem development. Owing to their special habitat, desert algae are often exposed to harsh environments, among which drought represents the most common stress. Green algae are considered to have drought tolerance potential; however, only a few studies have investigated this. In this study, we
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Description of four new filamentous cyanobacterial taxa from freshwater habitats in the Azores Archipelago J. Phycol. (IF 2.9) Pub Date : 2023-10-16 Rúben Luz, Rita Cordeiro, Jan Kaštovský, Jeffrey R. Johansen, Elisabete Dias, Amélia Fonseca, Ralph Urbatzka, Vitor Vasconcelos, Vítor Gonçalves
Simple filamentous cyanobacteria comprise a diverse and polyphyletic group of species, primarily in the orders Leptolyngbyales and Oscillatoriales, that need more sampling to improve their taxonomy. Oceanic islands, such as the Azores archipelago, present unique habitats and biogeographic conditions that harbor an unknown range of diversity of microorganisms. Filamentous cyanobacteria isolated from
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Species-dependent effects of seawater acidification on alkaline phosphatase activity in dinoflagellates J. Phycol. (IF 2.9) Pub Date : 2023-10-16 Chentao Guo, Ling Li, Senjie Lin, Xin Lin
Increases of atmospheric CO2 cause ocean acidification (OA) and global warming, the latter of which can stratify the water column and impede nutrient supply from deep water. Phosphorus (P) is an essential nutrient for phytoplankton to grow. While dissolved inorganic phosphorus (DIP) is the preferred form of P, phytoplankton have evolved alkaline phosphatase (AP) to utilize dissolved organic phosphorus
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Novel diversity within Roseofilum (Desertifilaceae, Cyanobacteria) from marine benthic mats with description of four new species J. Phycol. (IF 2.9) Pub Date : 2023-10-12 Yi Wang, David E. Berthold, Jing Hu, Forrest W. Lefler, I-Shuo Huang, H. Dail Laughinghouse
Benthic cyanobacterial mats (BCMs) are natural phenomena in marine environments. Reports of BCMs occurring across coastal marine environments have increased, partly driven by nutrient loading and climate change; thus, there is a need to understand the diversity involved in the proliferations and potential toxicity of the BCMs. Furthermore, marine cyanobacterial mats are observed growing on and affecting
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Same species, different population dynamics: Spatio-temporal differences of Undaria pinnatifida (Ochrophyta, Phaeophyceae) in the intertidal of North Patagonia, Argentina J. Phycol. (IF 2.9) Pub Date : 2023-10-10 Andrea Evangelina Arcángel, Emiliano Alexis Rodríguez, Juan Francisco Saad, Paula de la Barra, Maite Andrea Narvarte, Lorena Pía Storero, Patricio Javier Pereyra
Population dynamics can be influenced by physical and biological factors, particularly in stressful environments. Introduced species usually have great physiological plasticity, resulting in populations with different traits. Undaria pinnatifida, a macroalga originally described from northeast Asia, was introduced in Northern Patagonia, Argentina (San Matías Gulf) around 2010. To describe the spatio-temporal
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Hidden diversity in high-latitude Southern Hemisphere environments: Reinstatement of the genus Rama and description of Vandenhoekia gen. nov. (Cladophoraceae, Ulvophyceae, Chlorophyta), two highly variable genera J. Phycol. (IF 2.9) Pub Date : 2023-10-05 Christian Boedeker, Michael J. Wynne, Giuseppe C. Zuccarello
The continental coasts and remote islands in the high-latitude Southern Hemisphere, including the subantarctic region, are characterized by many endemic species, high abundance of taxa, and intermediate levels of biodiversity. The macroalgal flora of these locations has received relatively little attention. Filamentous green algae are prolific in the intertidal of southern islands, but the taxonomy
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In-silico whole-genome sequence analysis of a halotolerant filamentous mangrove cyanobacterium revealed CRISPR-Cas systems with unique properties J. Phycol. (IF 2.9) Pub Date : 2023-10-05 Shayontani Basu, Dhruba Bhattacharya, Arnab Pramanik, Malay Saha, Joydeep Mukherjee
Novel CRISPR systems capable of cleaving both DNA and RNA are progressively emerging as attractive tools for genome manipulation of prokaryotic and eukaryotic organisms. We report specific characteristics of CRISPR systems present in Oxynema aestuarii AP17, a halotolerant, filamentous cyanobacterium and the second known member of the Oxynema genus. In-silico analyses of its whole-genome sequence revealed
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Resolving the identity of commercially cultivated Ulva (Ulvaceae, Chlorophyta) in integrated seaweed-abalone aquaculture farms in South Africa J. Phycol. (IF 2.9) Pub Date : 2023-10-04 Teejaswani Bachoo, John J. Bolton, Brett M. Macey, Lineekela Kandjengo, Maggie M. Reddy
Species of Ulva have a wide range of commercial applications and are increasingly being recognized as promising candidates for integrated aquaculture. In South Africa, Ulva has been commercially cultivated in integrated seaweed-abalone aquaculture farms since 2002, with more than 2000 tonnes of biomass cultivated per annum in land-based paddle raceways. However, the identity of the species of Ulva
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Kelp gametophytes can survive and reproduce after being eaten in a warming ocean. J. Phycol. (IF 2.9) Pub Date : 2023-10-01 Matthew S Edwards
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Unraveling brown seaweed eukaryomes through metabarcoding. J. Phycol. (IF 2.9) Pub Date : 2023-10-01 Trevor T Bringloe
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New branched Porolithon species (Corallinales, Rhodophyta) from the Great Barrier Reef, Coral Sea, and Lord Howe Island J. Phycol. (IF 2.9) Pub Date : 2023-09-28 So Young Jeong, Paul W. Gabrielson, Jeffery R. Hughey, Andrew S. Hoey, Tae Oh Cho, Muhammad A. Abdul Wahab, Guillermo Diaz-Pulido
Porolithon is one of the most ecologically important genera of tropical and subtropical crustose (non-geniculate) coralline algae growing abundantly along the shallow margins of coral reefs and functioning to cement reef frameworks. Thalli of branched, fruticose Porolithon specimens from the Indo-Pacific Ocean traditionally have been called P. gardineri, while massive, columnar forms have been called
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Oligotrophic waters of the Northwest Atlantic support taxonomically diverse diatom communities that are distinct from coastal waters J. Phycol. (IF 2.9) Pub Date : 2023-09-22 Samantha P. Setta, Sarah Lerch, Bethany D. Jenkins, Sonya T. Dyhrman, Tatiana A. Rynearson
Diatoms are important components of the marine food web and one of the most species-rich groups of phytoplankton. The diversity and composition of diatoms in eutrophic nearshore habitats have been well documented due to the outsized influence of diatoms on coastal ecosystem functioning. In contrast, patterns of both diatom diversity and community composition in offshore oligotrophic regions where diatom
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Phenology and thallus size in a non-native population of Gracilaria vermiculophylla J. Phycol. (IF 2.9) Pub Date : 2023-09-20 Stacy A. Krueger-Hadfield, Alexis P. Oetterer, Lauren E. Lees, Jessica M. Hoffman, Erik E. Sotka, Courtney J. Murren
Phenology, or seasonal variation in life cycle events, is poorly described for many macroalgal species. We describe the phenology of a non-native population of Gracilaria vermiculophylla whose thalli are free-living or anchored by decorating polychaetes to tube caps. At a site in South Carolina, USA, we sampled 100 thalli approximately every month from January 2014 to January 2015. We assessed the
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18S rDNA gene metabarcoding of microeukaryotes and epi-endophytes in the holobiome of seven species of large brown algae J. Phycol. (IF 2.9) Pub Date : 2023-09-19 Marit F. Markussen Bjorbækmo, Juliet Brodie, Anders K. Krabberød, Ramiro Logares, Janina Fuss, Stein Fredriksen, Anders Wold-Dobbe, Kamran Shalchian-Tabrizi, David Bass
Brown algae (Phaeophyceae) are habitat-forming species in coastal ecosystems and include kelp forests and seaweed beds that support a wide diversity of marine life. Host-associated microbial communities are an integral part of phaeophyte biology, and whereas the bacterial microbial partners have received considerable attention, the microbial eukaryotes associated with brown algae have hardly been studied
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Albertania and Egbenema gen. nov. from Nigeria and the United States, expanding biodiversity in the Oculatellaceae (cyanobacteria) J. Phycol. (IF 2.9) Pub Date : 2023-09-11 Mildred U. Akagha, Nicole Pietrasiak, David F. Bustos, Alžběta Vondrášková, Sandra C. Lamb, Jeffrey R. Johansen
Knowledge of the tropical terrestrial cyanobacterial flora from the African continent is still limited. Of 31 strains isolated from soil and subaerial samples collected in Lagos State, Nigeria, three were found to be in the Oculatellaceae, including two species in a new genus. Subsequently, isolates from microbial mats in White Sands National Park in New Mexico, United States, and from a rock near
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Characterization of monogalactosyldiacylglycerol synthases in Gracilariopsis lemaneiformis and their potential roles in the fading of the thallus J. Phycol. (IF 2.9) Pub Date : 2023-09-09 Li Zhang, Quan Yuan, Chaoyang Hu, Xue Sun, Yifu Gong, Nianjun Xu
Membrane lipids play essential roles in regulating physiological properties in higher plants and algae. Monogalactosyldiacylglycerol (MGDG) is a major thylakoid membrane lipid, and it is an important source of polyunsaturated fatty acids for cells, plays a key role in the biogenesis of plastids, and maintains the function of the photosynthetic machinery. Several studies have indicated that the knockdown
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Correction J. Phycol. (IF 2.9) Pub Date : 2023-09-08
Correction to “Morphological and genetic analyses of Ostreopsis (Dinophyceae, Gonyaulacales, Ostreopsidaceae) species from Vietnamese waters with a re-description of the type species, Ostreopsis siamensis” Nguyen-Ngoc, L., Doan-Nhu, H., Larsen, J., Phan-Tan, L., Nguyen, X. V., Lundholm, N., Van Chu, T., & Huynh-Thi, D. N. (2021). Morphological and genetic analyses of Ostreopsis (Dinophyceae, Gonyaulacales
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Comparison and improvement of RNA extraction methods in Sargassum (Phaeophyta) J. Phycol. (IF 2.9) Pub Date : 2023-09-01 Weiling He, Xiao Ke, Tangcheng Li, Yuming Wu, Xianming Tang, Weizhou Chen, Tao Liu, Hong Du
Sargassum (Sargassaceae) is widely distributed globally and plays an important role in regulating climate change, but the landscape of genomes and transcripts is less known. High-quality nucleic acids are the basis for molecular biology experiments such as high-throughput sequencing. Although extensive studies have documented methods of RNA extraction, these methods are not very applicable to Sargassum
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Developing model systems for dinoflagellates in the post-genomic era J. Phycol. (IF 2.9) Pub Date : 2023-09-01 Hisatake Ishida, Uwe John, Shauna A. Murray, Debashish Bhattacharya, Cheong Xin Chan
Dinoflagellates are a diverse group of eukaryotic microbes that are ubiquitous in aquatic environments. Largely photosynthetic, they encompass symbiotic, parasitic, and free-living lineages with a broad spectrum of trophism. Many free-living taxa can produce bioactive secondary metabolites such as biotoxins, some of which cause harmful algal blooms. In contrast, most symbiotic species are crucial for
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Gene-rich plastid genomes of two parasitic red algal species, Laurencia australis and L. verruciformis (Rhodomelaceae, Ceramiales), and a taxonomic revision of Janczewskia J. Phycol. (IF 2.9) Pub Date : 2023-08-28 Maren Preuss, Pilar Díaz-Tapia, Heroen Verbruggen, Giuseppe C. Zuccarello
Parasitic red algae are an interesting system for investigating the genetic changes that occur in parasites. These parasites have evolved independently multiple times within the red algae. The functional loss of plastid genomes can be investigated in these multiple independent examples, and fine-scale patterns may be discerned. The only plastid genomes from red algal parasites known so far are highly
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Does dinocyst wall composition really reflect trophic affinity? New evidence from ATR micro-FTIR spectroscopy measurements J. Phycol. (IF 2.9) Pub Date : 2023-08-25 Pjotr Meyvisch, Kenneth Neil Mertens, Pieter Roger Gurdebeke, Christophe Sandt, Vera Pospelova, Henk Vrielinck, Ferenc Borondics, Stephen Louwye
Attenuated total reflection (ATR) microscope Fourier transform infrared (micro-FTIR) spectroscopy was used to investigate the dinosporin composition in the walls of modern, organic-walled dinoflagellate resting cysts (dinocysts). Variable cyst wall compositions were observed, which led to the erection of four spectrochemical groups, some with striking similarities to other resistant biomacromolecules