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Publications (263)
Wilsonosiphonia is a newly described marine algal genus with three species. The genus was previously confused with the widely distributed taxon Polysiphonia, and because of this, the taxonomy and distribution of Wilsonosiphonia is likely underestimated. We report the discovery of a minute filamentous red alga, Wilsonosiphonia fujiae (Rhodophyta) in...
Ocean currents play a role in both facilitating and impeding connectivity of marine organisms’ populations, serving as key drivers and potential barriers. The emergence of Taiwan around five million years ago (Mya) impacted the Kuroshio Current which later shaped the distribution of marine organisms. In this study, we examined how the Kuroshio Curr...
Accurately identifying species is the basis of all biological studies. There has been much confusion in the identification of Grateloupiacean species, which have finely pinnate gross morphology similar to Grateloupia filicina (the type species of the family). The objective of this study was to comprehensively investigate species identification and...
Colpomenia borea sp. nov. is described from Hokkaido, Japan and Magadan, Far East Russia based on morphological observations and molecular analyses using mitochondrial cox3 and chloroplast rbcL genes. This new species is distinguished from other Colpomenia by its small globular to ovoidal thallus up to 5 cm in diameter, and thin thallus membrane co...
A species, new to science, is described from Son La province, Vietnam. The new species is similar to B. yongtaiense, B. layae and B. sridithii in the hairy lip at base but clearly differs by the papillose margin and inner surface of dorsal sepal and petals, lip without mid keel and dense hairs on lateral keels, stelidia 2 times longer than 3 simila...
Raw material of gelidioid red algae yielding high-quality agar has been in short supply due to overharvesting, but in situ farming of gelidioids has not been practical due to their slow growth. To produce vegetative seedstock of a cosmopolitan species, Pterocladiella capillacea, we investigated the number and length of regenerated branches arising...
The marine red algal order Halymeniales currently includes two families, the Halymeniaceae and Tsengiaceae, and consist of 38 genera and about 358 species. Phylogenetic analyses on specific taxa of the order are common, but not comprehensive, leaving the many intra-ordinal relationships within the Halymeniales unresolved. To reassess the phylogeny...
The new species Hypnea corona Huisman & Petrocelli is described to accommodate specimens from Australia, New Zealand, Italy, and Japan that were previously included in the Hypnea cornuta complex but were shown by recent molecular studies to represent a species-level clade. Hypnea corona produces distinctive stellate, starch-filled propagules that a...
Although complete mitogenomic data have been widely applied in human and other animal population studies, they are extremely limited for florideophycean red algal populations. Gelidiella fanii is a recently described rhodophyta, previously misidentified as G. acerosa, a cosmopolitan agar-yielding species from tropical to subtropical waters. To deci...
During a 2007 expedition dedicated to study kelp diversity within the Magellanic region, specimens of Lessonia Bory with corrugate, yellowish blades were found along the Beagle Channel. This type of corrugated Lessonia is uncommon, with exception of two species from New Zealand. Three possible hypotheses for its origin were explored in this study:...
In Peru, an ongoing project has been to document the marine macroalgal biodiversity using molecular approaches because, to date, the Peruvian marine flora has been mostly characterized on the basis of morphological observations. We herein report on red algae collected along the coast of Peru, including specimens collected at historically important...
Sargassum species form large beds that play an important role in coastal ecosystems. The beds are abundant and Sargassum is often used as food and in Asian medicine in Vietnam. As a base for future use and conservation, we surveyed 14 species of Sargassum at eight locations during April-May of 2018 and 2019. Sargassum species from Vietnam were divi...
Wilsonosiphonia is a newly described marine algal genus with three species. The genus was previously confused with the widely distributed taxon Polysiphonia, and because of this, the taxonomy and distribution of Wilsonosiphonia is likely underestimated. We report the discovery of a minute filamentous red alga, Wilsonosiphonia fujiae (Rhodophyta) in...
The evolutionary and population demographic history of marine red algae in East Asia is poorly understood. Here we reconstructed the phylogeographies of two upper intertidal species endemic to East Asia, Gelidiophycus divaricatus and G. freshwateri. Phylogenetic and phylogeographic inferences of 393 mitochondrial cox1, 128 plastid rbcL, and 342 nuc...
Identification of small Gelidium species based on morphology is difficult; as a consequence, the name Gelidium pusillum has been used for many small gelidiacean taxa throughout the world. Molecular-assisted identifications, however, are demonstrating that G. pusillum has a more restricted distribution than previously recognised. We used detailed mo...
An ongoing biodiversity survey along the Brazilian coast revealed a previously unknown species of Gelidium. Morphological studies coupled with molecular phylogenetic analyses, using the molecular markers rbcL and cox1, confirmed that this is a new species of red algae, which is described and illustrated here as Gelidium brasiliense. This species is...
The Gelidium species are susceptible to a great phenotypic plasticity. In this genus, studies integrating morphological and molecular data have been increasingly used to define species. To date nine Gelidium species are reported along the Brazilian coast. Gelidium floridanum is the most frequently recorded species in Brazilian but it is also often...
Genetic continuity of Digenea simplex outside the Atlantic waters remains less studied, despite its long exposure to oriental folk medicine and wide distribution in tropical waters. Mitochondrial COI-5P and plastid rbcL sequences and morphology were investigated for plants from Mexico and additional specimens from Japan. Two new species, Digenea me...
Two species of the brown algal genus Rosenvingea are reported from south-west (SW) Australia, including the widely distributed R. orientalis and the new species R. australis Huisman, G.H. Boo et S.M. Boo, sp. nov. Molecular phylogenies of mitochondrial cox 3 and plastid psa A unequivocally align the SW Australian R. orientalis with specimens from V...
Red algae (Rhodophyta) underwent two phases of large-scale genome reduction during their early evolution. The red seaweeds did not attain genome sizes or gene inventories typical of other multicellular eukaryotes. We generated a high quality 92.1 Mbp draft genome assembly from the red seaweed Gracilariopsis chorda, including methylation and small (...
Despite the recent description of Stenogramma guleopoense in Korea, the issue of S. interruptum in the northwestern Pacific is still a matter of debate. We analyzed 24 rbcL sequences from specimens collected in Korea, including a longer fragment of rbcL (949 base pairs from the type of S. guleopoense, in addition to morphological observations. Phyl...
A new and putatively endemic species of Hydroclathrus, Hydroclathrus rapanuii, is described from the geographically isolated Easter Island in the southeastern Pacific based on morphological and molecular phylogenetic data. It is distinguished from other Hydroclathrus by thalli of unevenly furrowed thin membranes, and angular, block-like plurangial...
The genus Ptilophora currently includes 16 species occurring mostly in subtidal habitats of the Indo-Pacific Ocean, but its global diversity and biogeography are poorly understood. We analyzed mitochondrial cox1, plastid rbcL and plastid psbA sequences from specimens collected in southern Madagascar during the 2010 Atimo Vatae expedition and studie...
The diversity of the genus Ulva in South American waters is matter of debate. Specimens of Ulva sp. were collected in northern Chile and analyzed using sequences of rbcL and tufA genes in combination with morphological observations. Molecular analyses revealed the presence of Ulva australis, a native species from northeast Asia that has also been r...
Analysis of Phrynosoma blainvillii Gray from Marina, Monterey County, California, using 150 bp paired-end Illumina sequences (Illumina, San Diego, CA) resulted in the assembly of its complete mitogenome. The mitogenome is 16,946 bp in length and contains a putative origin of light strand replication (OL), control region, 22 tRNA, 2 rRNA, and 13 pro...
Among the distinctive members of the brown algal family Scytosiphonaceae is the genus Hydroclathrus, which are primarily distinguished by their clathrate (net-like) appearance. Hydroclathrus, despite being seasonal and species-poor, is a conspicuous floristic component in many tropical to warm temperate coasts. However, compared with other closely...
We investigated species in the family Phyllophoraceae from Peru using sequences of the plastid rbcL sequences and morphological examination. Here we describe Acletoa tarazonae gen. & sp. nov., characterized by the presence of secondary medullary cells around cystocarps, gonimoblast initials that are downwardly and upwardly directed, and a linear ar...
Seaweed aquaculture beds (SABs) that support the production of seaweed and their diverse products, cover extensive coastal areas, especially in the Asian-Pacific region, and provide many ecosystem services such as nutrient removal and CO2 assimilation. The use of SABs in potential carbon dioxide (CO2) mitigation efforts has been proposed with comme...
Rhodophyta, or red algae, comprises a monophyletic lineage within Archaeplastida that includes glaucophyte algae and green algae plus land plants. Rhodophyta has a long fossil history with evidence of Bangia-like species in ca. 1.2 billion-year-old deposits. Red algal morphology varies from unicellular, filamentous, to multicellular thalloid forms,...
The taxonomy of Pterocladiella from Pacific South America remains less studied. On the basis of morphological observations and mitochondrial cox1 and plastid rbcL sequences, we describe a new species, P. andresii, from Chile and characterize recently collected specimens of P. caloglossoides from Peru, the first verified since Howe’s original collec...
The red alga Gracilaria vermiculophylla, a species native to the waters of Korea and Japan, has invaded marine coastal areas of Europe and the Americas, thriving in conditions that differ from those of its native habitat. In recent years, G. vermiculophylla has been discovered in the Long Island Sound (LIS) estuary growing alongside the native cong...
Members of the brown algal genus Hydroclathrus, easily identified by their characteristic net-like appearance, are economically important species that are used as food, fertilizer, and animal fodder. Hydroclathrus species also produce high value natural products such as alginates and fucoidan, and are collectively considered as potential sources of...
The agarophyte family Gelidiellaceae currently includes 26 species in two genera, Gelidiella and Parviphycus, but the generic status and species boundaries have not been fully explored. In order to resolve taxonomic issues in the family, we analyzed mitochondria-encoded cox1 and plastid-encoded rbcL and psaA genes from types and fresh collections i...
DNA sequences from type specimens provide independent, objective characters that enhance the value of type specimens and permit the correct application of species names to phylogenetic clades and specimens. We provide mitochondrial genomes (mitogenomes) from archival type specimens of ten species in agar-producing red algal genera Gelidium and Pter...
We investigated the phylogenetic position of Ahnfeltiopsis furcellata and Gymnogongrus disciplinalis from Peru and Chile using nuclear large-subunit ribosomal RNA, mitochondrial COI and plastid rbcL sequences and morphological examination. Both the combined (LSU + COI + rbcL) and rbcL data sets revealed that A. furcellata and G. disciplinalis consi...
We investigated species in the family Phyllophoraceae from Korea using nuclear large-subunit ribosomal RNA, mitochondrial COI and plastid rbcL sequences and morphological examination. To understand the taxonomic relationships of Korean Ahnfeltiopsis, we also analysed topotype materials of A. leptophylla and Besa papillaeformis from California. Both...
We analyzed both mitochondrial cox1 and plastid rbcL sequences from specimens of Pterocladiella from Madagascar and compared their morphologies with previously described species in the genus. Both molecular and morphological datasets demonstrated the presence of five species in Madagascar: P. australafricanensis, P. bartlettii, P. caerulescens, and...
Rhodophyta, or red algae, comprises a monophyletic lineage within Archaeplastida that includes glaucophyte algae and green algae plus land plants. Rhodophyta has a long fossil history with evidence of Bangia-like species in ca. 1.2 billion-year-old deposits. Red algal morphology varies from unicellular, filamentous, to multicellular thalloid forms,...
DNA was extracted from a red algal herbarium specimen collected in 1920 and subjected to next generation sequencing. Here we report the assembly of the mitogenome of a marine mussel, Mytilus trossulus, deciphered from this plant museum specimen. The mitogenome is 16,744 bp in length, contains 38 genes, and is more similar to other M. trossulus repo...
Pterocladia lucida (Gelidiales), an important agar source in New Zealand, commonly occurs subtidally in Australia and New Zealand and is very variable in morphology. In the present study, the genetic diversity of P. lucida was investigated for 33 specimens collected in Australia and New Zealand. Phylogenetic analyses of mitochondrial cox1 and plast...
Gelidioid specimens from Singapore were analyzed using sequences of cox1 and rbcL to identify the species. Both datasets revealed the presence of four species: Gelidiella acerosa, Pterocladiella bartlettii, Pterocladiella caerulescens and Gelidium sentosaense sp. nov., described here. Gelidium sentosaense formed small tufts up to 1 cm high and occu...
Most macroalgae and other aquatic organisms feature life cycles without a stage of dormancy and elevated stress resistance that is comparable to plant seeds. During anthropogenic transportation they are therefore probably more exposed to stress than plant invaders, which could result in a more rigorous selection of stress-resistant phenotypes. Howe...
Genetic diversity of native and introduced populations of Ulva pertusa (Ulvales, Chlorophyta) was examined using genetic markers of chloroplast, mitochondria and nuclear non-coding region sequences. In the preliminary investigations to genetically identify the species for further analyses, U. pertusa was found only from temperate coasts of the more...
The integration of foreign DNA into algal and plant plastid genomes is a rare event, with only a few known examples of horizontal gene transfer (HGT). Plasmids, which are well-studied drivers of HGT in prokaryotes, have been reported previously in red algae (Rhodophyta). However, the distribution of these mobile DNA elements and their sites of inte...
Hypnea musciformis is one of the most studied species of the genus Hypnea. It has a wide geographic range along the Atlantic, Pacific and Indian Oceans that would be consistent with an extensive intraspecific variation in morphology. Hypnea musciformis has been previously reported on coasts of the Yucatan Peninsula; however, neither morphological c...
The Florideophyceae is the most abundant and taxonomically diverse class of red algae (Rhodophyta). However, many aspects of the systematics and divergence times of the group remain unresolved. Using a seven-gene concatenated dataset (nuclear EF2, LSU and SSU rRNAs, mitochondrial cox1, and plastid rbcL, psaA and psbA genes), we generated a robust p...
The capacity of the East Asian seaweed Gracilaria vermiculophylla (“Ogonori”) for production of prostaglandin E2 from arachidonic acid occasionally causes food poisoning after ingestion. During the last two decades the alga has been introduced to Europe and North America. Non-native populations have been shown to be generally less palatable to mari...
We investigated fresh collections and an isotype of Phyllophora peruviana from central Peru using morphology and sequencing the plastid rbcL gene. In the rbcL phylogenetic tree, P. peruviana consisted of three genetic groups, forming a clade. As this P. peruviana clade was distantly related to Phyllophora including the generitype Phyllophora crispa...
Four species have been described in the genus Pikea (Dumontiaceae, Gigartinales): Three species from North America and one species from Japan. However, the phylogeny and species delimitation in Pikea remain poorly resolved. Here we provide both rbcL and cox1 sequences for all species of Pikea, including the type of P. pinnata and a paratype of P. r...
We compared the responses of native and non-native populations of the seaweed Gracilaria vermiculophylla to heat shock in common garden-type experiments. Specimens from six native populations in East Asia and from eight non-native populations in Europe and on the Mexican Pacific coast were acclimated to two sets of identical conditions before their...
This paper contains descriptions and illustrations identifying 25 taxa ofthe genus Phacus
collected from 51 sites of Korean fresh waters. Most of the identified taxa occur in old and stagnant
waters, especially natural wetlands. Five taxa have been rarely reported worldwide: Ph. acuminatus
var. iowensis, Ph.lepocincloides, Ph. manginii, Ph. strongy...
Two red algal classes, the Florideophyceae (ca. 6,748 spp.) and Bangiophyceae (ca. 198 spp.) comprise 98% of red algal diversity in marine and freshwater habitats. These two classes form well-supported monophyletic groups in most phylogenetic analyses. Nonetheless, the inter-ordinal relationships remain largely unresolved, in particular in the larg...
We evaluated the relationships among species in the genus Gelidiella using 47 rbcL and 29 COI sequences, including those from 18 specimens collected in Madagascar. Molecular analyisis revealed the presence of three major lineages among Magalasy Gelidiella which were assigned, based on morpho-anatomical observation, to Gelidiella acerosa, G. ligulat...
Yonagunia, a genus of the red algal order Halymeniales, has never been recorded in the Western Indian Ocean. In this study, we used molecular assisted alpha taxonomy to assess the diversity of the marine algal flora of southern Madagascar. A combination of COI-5P and rbcL sequences, used as a DNA-barcode and phylogenetic marker respectively, reveal...
We described the complete mitochondrial genome of Gracilaria chilensis (Gracilariales), an economically important agarophyte alga. The genome was a 26,898 bp circular DNA with 27.6% guanine-cytosine (GC) content, and it encoded 25 protein-coding genes, two ribosomal RNAs (rRNAs), 26 transfer RNAs (tRNAs), and an intron (499 bp) in trnI. The gene co...
Hypnea flexicaulis is a carrageenophyte red alga that commonly occurs on various substrata in the lower intertidal of the Indo-Pacific Ocean. To examine the genetic variability within the species and the relationships of genetic lineages to contemporary distribution, we analyzed plastid rbcL and mitochondrial cox1 genes from specimens collected in...
Plants of the red algal genus Parviphycus are typically diminutive and often occur in mixed stands with other turf species, leading to considerable difficulty in locating them in the field. Once sorted, identification to genus and species is challenging because of their lack of conspicuous diagnostic features. Examination of the type specimen and f...
The taxonomic status and the distribution of Rosenvingea species need attention because of the difficulties in morphological identification in the laboratory as well as in the field. We analyzed mitochondrial cox3 and plastid psaA gene sequences from Rosenvingea species from Vietnam, Mexico and Panama in combination with morphological examinations....
A species of Gelidium, morphologically very similar to G. pusillum, was collected from Apulia (southern Italy). Molecular sequencing data (rbcL and cox1) revealed it to be Gelidium americanum, previously unknown from the Mediterranean Sea.
At first described as Pterocladia americana, the species was later transferred to the genus Gelidium on the ba...