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Abel Senties - One of the best experts on this subject based on the ideXlab platform.

  • meristotheca spinella nunez resendiz dreckmann senties sp nov Solieriaceae rhodophyta a new cylindrical species from the southwestern gulf of mexico
    Cryptogamie Algologie, 2019
    Co-Authors: Maria Luisa Nunezresendiz, Kurt M Dreckmann, Abel Senties, Hilda Leontejera
    Abstract:

    The genus Meristotheca J. Agardh is the second largest in Solieriaceae with 13 species widely distributed whose thalli are mainly flattened. On the basis of molecular and morpho-anatomical evidence, M. spinella Nunez-Resendiz, Dreckmann & Senties, sp. nov. is the second species in the genus with cylindrical axes to be described from the southwestern Gulf of Mexico. rbcL sequences and genetic distance values indicate its separation from other species within Meristotheca and from other morphologically similar species occurring in its known distribution range as M. cylindrica Nunez-Resendiz, Dreckmann & Senties. The numerous short branchlets that cover the margins of main axes and branches, among other relevant anatomical and reproductive characters, is the main difference from M. cylindrica, its sister species.

  • marine red algae rhodophyta of economic use in the algal drifts from the yucatan peninsula mexico
    Phytotaxa, 2019
    Co-Authors: Maria Luisa Nunez Resendiz, Kurt M Dreckmann, Abel Senties, Michael J Wynne, Hilda Patricia Leon Tejera
    Abstract:

    Red algae are the most conspicuous component in algal drifts that periodically arrive on the coasts of the Yucatan Peninsula. Given the presence of agars and carrageenans in their cell wall and the synthesis of secondary metabolites that act as antitumors or antioxidants, most of these species are highly valued in the international market. However, in this region of Mexico they are not used but represent a problem of waste from beaches. Our aim was to determine the composition of marine red algae of economic use in the algal drifts of the Yucatan Peninsula, providing brief descriptions, photographs that facilitate their identification and possible explanations for their causes and routes of origin. 13 samplings were carried out at 14 sites, collecting fresh and complete thalli from which the species of economic importance were described. 24 species distributed in six orders and seven families were identified. The most abundant families for both the number of species and the amount of biomass were Gracilariaceae (10 species), Rhodomelaceae (6 species) and Solieriaceae (3 species). The localities with the greatest diversity and biomass were those belonging to Campeche: Sabancuy (11 species), Punta Xen (14 species), Tortuga Bay (13 species) and Playa Bonita (13 species). From the present study we contributed six new records endemic to Campeche, including the first record of the genus Codiophyllum for the Western Atlantic Ocean. Our data on diversity, biomass, periodicity and growth rates of red algal drifts allow us to suggest that the Campeche and Yucatan drifts are a sustainable source of raw material.

  • eucheumatopsis isiformis gen comb nov Solieriaceae rhodophyta from the yucatan peninsula to accommodate eucheuma isiforme
    Phycologia, 2019
    Co-Authors: Maria Luisa Nunezresendiz, Kurt M Dreckmann, Abel Senties, Michael J Wynne, Hilda Leontejera
    Abstract:

    On the basis of COI-5P, cox2–3 spacer, RuBisCo spacer, and rbcL sequences, Eucheuma was resolved as a paraphyletic genus in the Solieriaceae. Specimens of E. isiforme from the Yucatan Peninsula and Florida form an independent lineage in the family that was also different from E. denticulatum, the generitype. To accommodate this species, we described Eucheumatopsis as a new genus that differs from Eucheuma both molecularly and geographically. Because the four molecular markers used and morphological characters did not support the independence of Eucheuma isiforme var. denudatum from E. isiforme var. isiforme, we have proposed to no longer recognize var. denudatum as a separate variety.

  • 4 variacion genetica en meristotheca cylindrica Solieriaceae rhodophyta en campeche mexico genetic variation of meristotheca cylindrica Solieriaceae rhodophyta in campeche mexico
    Hidrobiologica, 2018
    Co-Authors: Carlos Adan Palma Ortiz, Kurt M Dreckmann, Maria Luisa Nunez Resendiz, Abel Senties
    Abstract:

    RESUMEN Antecedentes . Los estudios enfocados en la variacion genetica son fundamentales para evidenciar procesos de radiacion adaptativa y especiacion. En este sentido, los marcadores moleculares han jugado un papel protagonico durante las pasadas tres decadas. Objetivos . Meristotheca cylindrica es una especie comun en las costas de Campeche, importante economicamente por la presencia de carragenanos en su pared celular; sin embargo, despliega un espectro de variabilidad morfologica que la confunde con especies pertenecientes a categorias taxonomicas diferentes, razon que la hace un buen ejemplo para analizar la probable variacion genetica al interior de sus poblaciones. Metodos . Utilizando secuencias de ADN plastidial de la region espaciadora de laRuBisCo, y ADN mitocondrial de la region espaciadora cox 2-3,fue posible determinarla variacion genetica en 45 individuos de M. cylindrica procedentesde cinco poblaciones registradaspara Campeche. Resultados. La region espaciadora de la RuBisCo arrojo cuatro haplotipos (R1-R4), de los cuales R1 fue el mas abundante; la diversidad haplotipica fue similar en las poblaciones (Hd<0.4) y la red haplotipica revelomoderada divergencia entre las poblaciones. La region espaciadora cox 2-3nos permitio encontrar nueve haplotipos (C1-C9); la poblacion con la mayor diversidad haplotipica fue Sabancuy (Hd=0.7), en contraste con Bahia Tortuga, en la que solo se presento un haplotipo (por tanto Hd=0). La red haplotipica con la region espaciadora cox 2-3 revelo estructura total. Conclusiones. La distribucion de los haplotipos con ambos genes, y la estructura mostrada en las redes haplotipicas, sugieren un evento de especiacion para estos grupos. Finalmente, discutimos el aislamiento geografico del suroeste del Golfo de Mexico como un escenario evolutivo plausible. Abstract Backgrounds . Studies centered on genetic variation are nuclear to show processes such as adaptive radiation, and speciation. In this sense, the current molecular protocols have proved to be a very useful tool for at least three decades. Objectives. Meristotheca cylindrica is a common species along the coast of Campeche, at the south western Gulf of Mexico, it is, also, an economically important resource because the carrageenans present in its cell walls. However, it displays a spectrum of morphological variation close to taxa not taxonomically related. This feature alone, makes M. cylindrica a perfect system to analyze a probable genetic variation within its known populations. Methods. Using DNA plastidial sequences of the spacer region of RuBisCo, and the spacer mitochondrial region cox2 -3, it was possible to show genetic variation in 45 individuals of M. cylindrica from five populations. Results. RuBisCo produced four haplotypes (R1-R4), R1 being dominant. Haplotypic diversity was similar through the populations (Hd=~0.2, ~0.38), but the haplotypic net reflected moderated divergence between populations. The cox 2-3 spacer analysis, otherwise, shows up nine haplotypes (C1-C9). The population with the higher haplotypic diversity was Sabancuy (Hd=0.7), in contrast with Bahia Tortuga, in which we found just one haplotype (so,Hd=0). Conclusions. The haplotypic network, through the spacer region cox 2-3 analysisrevealsa totalgenetic structure. Haplotypic distribution (sustained with both genes), and the genetic structure evidenced by the haplotypic net, suggest an event of speciation in course. We discuss the geographical isolation of the South Western Gulf of Mexico as an evolutionary scenario..

  • tepoztequiella rhizoidea gen et sp nov Solieriaceae rhodophyta from the yucatan peninsula mexico
    Phycologia, 2018
    Co-Authors: Maria Luisa Nunez Resendiz, Giuseppe C. Zuccarello, Kurt M Dreckmann, Abel Senties, Hilda Leontejera
    Abstract:

    Abstract Molecular methods have greatly aided in discovering new diversity in many cryptic algal groups. Molecular-assisted species discovery has focused morphological analyses on previously overlooked taxa, leading to a better understanding of diversity and evolutionary patterns. The Yucatan Peninsula, as a junction of North and South American Atlantic floras, is very diverse and, while a well-explored area, continues to reveal new species. Our studies in this area have revealed a new cylindrical member of the Solieriaceae. Based on COI-5P, rbcL and RuBisCo spacer sequences, we show that this entity is phylogenetically unique. Its position in phylogenetic analyses, combined with morphological characters and the genetic divergence from other species and genera within the family, strongly supports the establishment of Tepoztequiella rhizoidea gen. & sp. nov. The diagnostic character of T. rhizoidea is the presence of many rhizoids arising from medullary filaments and from the cells of the inner cortex.

Ryuta Terada - One of the best experts on this subject based on the ideXlab platform.

  • Concise review of the genus Meristotheca (Rhodophyta: Solieriaceae)
    Journal of Applied Phycology, 2020
    Co-Authors: Iris Ann Borlongan, Ryuta Terada, Anicia Hurtado
    Abstract:

    The genus Meristotheca (Solieriaceae) includes fifteen currently accepted species. They are widely distributed throughout the tropics and subtropics of both hemispheres, inhabiting the intertidal and subtidal regions of rocky shores. Molecular phylogenetic studies allowed a precise understanding of the species diversity and biogeography of the genus. The commercial value of certain species of Meristotheca lies in its use primarily as food for direct human consumption and to some extent as raw materials for extraction of carrageenan and other bioactive compounds. Intensified harvesting of the seaweeds resulted in the depletion of their natural beds; hence, several attempts have been made for mariculture. The management effort for the farming of Meristotheca on a commercial scale is still at its early stage. Studies on the phenology, sporulation, callus induction and thallus regeneration, photosynthesis, and growth of these potentially useful species contributed to the advancement of cultivation technologies. Further research on the biochemistry and utilization of Meristotheca species is necessary for the commercial competitiveness of these promising seaweed resources.

  • Effects of light quality and temperature on the photosynthesis and pigment content of a subtidal edible red alga Meristotheca papulosa (Solieriaceae, Gigartinales) from Japan
    Journal of Applied Phycology, 2020
    Co-Authors: Iris Ann Borlongan, Gregory N Nishihara, Sayuri Suzuki, Jumpei Kozono, Ryuta Terada
    Abstract:

    This study investigated the effects of different light spectral qualities and temperature on the photosynthesis and pigment content of a subtidal edible red alga, Meristotheca papulosa . Photosynthesis – irradiance ( P–E ) experiments were carried out under red (660 nm), blue (450 nm), green (525 nm, light-emitting diodes), and white light (visible light, metal halide lamp), and at 12, 20, and 28 °C, respectively. Maximum net photosynthetic rates ( NP _ max ) were highest under green light. Other P–E parameter estimates were similar among algae under red, blue, and green light, including their lower initial slope ( α ) and higher saturation irradiances ( E _ k ) as compared to those under white light. Additionally, NP _ max and E _ k under white light were highest at 28 °C, and lowest at 12 °C with characteristic photoinhibition at irradiances greater than 150 μmol photons m^−2 s^−1. Photosynthesis – temperature ( P–T ) experiment revealed that the maximum gross photosynthetic rate ( GP _ max ) occurred at 22.1 °C, which was within the optimal temperature range of F _ v /F _ m (21.5–23.6 °C). Exposures to the different light qualities at 100 μmol photons m^−2 s^−1 for 7 days showed increased phycoerythrin (PE) concentration of algae under blue and green light, while chlorophyll- a and phycocyanin (PC) showed little variation in all light qualities. Therefore, considering future management prospects for M. papulosa mariculture, we suggest that green light could be utilized to enhance photosynthesis. Furthermore, if the aim is to achieve high PE content for an improved reddish-color fresh product, exposure to blue or green light could be a good alternative.

  • photosynthetic performance of the red alga solieria pacifica Solieriaceae from two different depths in the sublittoral waters of kagoshima japan
    Journal of Applied Phycology, 2017
    Co-Authors: Iris Ann Borlongan, Satoshi Shimada, Gregory N Nishihara, Ryuta Terada
    Abstract:

    Photosynthetic responses to photosynthetically active radiation (PAR) and temperature were examined in the red alga Solieria pacifica from deep (35 m) and shallow (5 m) portions of the sublittoral zone in Kagoshima, Japan. Dissolved oxygen sensors and pulse-amplitude modulated (PAM) fluorometry were used for the measurements of net photosynthesis, dark respiration rates, and photochemical efficiency. The photosynthetic performances of the deep- and shallow-water ecotypes provided substantial evidence of their adaptation to the ambient PAR and temperature conditions of their respective habitats. Both algal samples showed different temperature optima for photosynthesis: 19.5–19.9 °C for S. pacifica from Mageshima (MAG) and 18.6–27.0 °C for species from Yatsushiro Bay (YAT), that reflect the temperature ranges in the 35- and 5-m depths of the sublittoral zone, respectively. Maximum net photosynthetic rate (P max = 3.73 μg O2 gfw −1 min−1), compensation PAR (E c = 21 μmol photons m−2 s−1), and saturation PAR (E k = 131 μmol photons m−2 s−1) were higher in YAT S. pacifica than in MAG samples (P max = 1.55 μg O2 gfw −1 min−1, E c = 3 μmol photons m−2 s−1, E k = 15 μmol photons m−2 s−1), which can be attributed to the higher PAR levels experienced by the seaweeds occurring at depths of 5 m. The large depressions in effective quantum yields (Φ PSII) after chronic PAR exposures and failed recovery in maximum quantum yields (F v /F m) after dark acclimation of MAG S. pacifica suggest a greater tendency for photodamage in the deep-water ecotype. As for the shallow-water S. pacifica (YAT), complete recovery occurred only at 20 °C. Low temperature limitation may account for the decreased gross photosynthetic rates and delayed recovery of post-dark acclimation F v /F m of YAT S. pacifica at temperatures below their optimum, which can occur during winter.

  • effects of temperature and par on the photosynthesis of kappaphycus sp Solieriaceae rhodophyta from okinawa japan at the northern limit of native kappaphycus distribution in the western pacific
    Phycologia, 2017
    Co-Authors: Iris Ann Borlongan, Satoshi Shimada, Gregory N Nishihara, Ryuta Terada
    Abstract:

    Abstract: The successful cultivation of the Japanese Kappaphycus sp. (K. striatus auctorum japonicorum) in Okinawa, Japan, requires the detailed understanding of its physiological response to environmental factors. The photosynthetic performance of this native red alga was investigated under a variety of temperature and photosynthetic active radiation (PAR) conditions by employing methods based on pulse amplitude modulation–chlorophyll fluorometry and dissolved oxygen sensors. The net photosynthesis–irradiance (P–E) curve at 24°C revealed that the compensation (Ec) and saturation (Ek) irradiances were 26 [95% Bayesian prediction interval (BPI), 11–29 μmol photons m−2 s−1] and 140 (95% BPI, 98–192) μmol photons m−2 s−1, respectively. No inhibition in oxygenic evolution and quantum yield was observed at the highest PAR of 1000 μmol photons m−2 s−1. However, the ability of the seaweed to recover from photoinhibition was complicated following long-term PAR exposures at 18°C but not at 28°C. The Japanese Kappa...

  • the effect of irradiance and temperature on the photosynthesis and growth of a cultivated red alga kappaphycus alvarezii Solieriaceae from vietnam based on in situ and in vitro measurements
    Journal of Applied Phycology, 2016
    Co-Authors: Ryuta Terada, Satoshi Shimada, Gregory N Nishihara, Keisaku Shioya, Shigeo Kawaguchi
    Abstract:

    The effect of irradiance and temperature on the photosynthesis and growth of a Vietnamese-cultivated red alga, Kappaphycus alvarezii, was determined by laboratory and field measurements. Dissolved oxygen sensors and pulse amplitude modulated (PAM) fluorometry were used for the measurements of photosynthetic efficiency. A Diving-PAM revealed that in situ measurements of the effective quantum yield (ΦPSII) were negatively correlated with incident irradiance. ΦPSII decreased as irradiance increased at noon and recovered in the evening, suggesting photo-inhibition. A model of the net photosynthesis–irradiance (P-E) relationship determined in a laboratory experiment at 26 °C revealed that the net photosynthetic rate quickly increased at irradiances below the estimated saturation irradiance of 154 μmol photons m−2 s−1 (95 % Bayesian credible interval (BCI) of 117–203 μmol photons m−2 s−1). Gross photosynthesis and dark respiration under the laboratory measurements were also determined over a range of temperatures (8–42 °C), revealing that the gross photosynthetic rates of 8.0 (BCI 7.03–9.59) μg O2 gww−1 min−1 at 31.1 (BCI 30.2–32.0)°C, and the dark respiration rate increased exponentially from a low of 0.22 μg O2 gww−1 min−1 at 10 °C to a high of 1.88 μg O2 gww−1 min−1 at 42 °C. The estimated highest value of the maximum quantum yield (ΦPSII at 0 μmol photons m−2 s−1 = Fv/Fm) determined with the Imaging-PAM and occurred at 22.2 (BCI 20.8–23.5)°C and was 0.51 (BCI 0.48–0.54). Relative growth rate (RGR) and the survival rate after 2 weeks of laboratory culture showed that the relatively high growth rates (ca. 1.5 %) occurred at 28 and 32 °C; however, mortality was 100 % at 36 °C. This species is considered to be well-adapted to the natural temperature range of study site; however, it is likely close to the marginal temperature conditions. Furthermore, daytime incident irradiance on the frond under fine clear sky might be too strong for the effective photosynthesis of this species, suggesting that optimum irradiance for gross photosynthesis with the minimum decline of ΦPSII seems to be much lower.

Kurt M Dreckmann - One of the best experts on this subject based on the ideXlab platform.

  • meristotheca spinella nunez resendiz dreckmann senties sp nov Solieriaceae rhodophyta a new cylindrical species from the southwestern gulf of mexico
    Cryptogamie Algologie, 2019
    Co-Authors: Maria Luisa Nunezresendiz, Kurt M Dreckmann, Abel Senties, Hilda Leontejera
    Abstract:

    The genus Meristotheca J. Agardh is the second largest in Solieriaceae with 13 species widely distributed whose thalli are mainly flattened. On the basis of molecular and morpho-anatomical evidence, M. spinella Nunez-Resendiz, Dreckmann & Senties, sp. nov. is the second species in the genus with cylindrical axes to be described from the southwestern Gulf of Mexico. rbcL sequences and genetic distance values indicate its separation from other species within Meristotheca and from other morphologically similar species occurring in its known distribution range as M. cylindrica Nunez-Resendiz, Dreckmann & Senties. The numerous short branchlets that cover the margins of main axes and branches, among other relevant anatomical and reproductive characters, is the main difference from M. cylindrica, its sister species.

  • marine red algae rhodophyta of economic use in the algal drifts from the yucatan peninsula mexico
    Phytotaxa, 2019
    Co-Authors: Maria Luisa Nunez Resendiz, Kurt M Dreckmann, Abel Senties, Michael J Wynne, Hilda Patricia Leon Tejera
    Abstract:

    Red algae are the most conspicuous component in algal drifts that periodically arrive on the coasts of the Yucatan Peninsula. Given the presence of agars and carrageenans in their cell wall and the synthesis of secondary metabolites that act as antitumors or antioxidants, most of these species are highly valued in the international market. However, in this region of Mexico they are not used but represent a problem of waste from beaches. Our aim was to determine the composition of marine red algae of economic use in the algal drifts of the Yucatan Peninsula, providing brief descriptions, photographs that facilitate their identification and possible explanations for their causes and routes of origin. 13 samplings were carried out at 14 sites, collecting fresh and complete thalli from which the species of economic importance were described. 24 species distributed in six orders and seven families were identified. The most abundant families for both the number of species and the amount of biomass were Gracilariaceae (10 species), Rhodomelaceae (6 species) and Solieriaceae (3 species). The localities with the greatest diversity and biomass were those belonging to Campeche: Sabancuy (11 species), Punta Xen (14 species), Tortuga Bay (13 species) and Playa Bonita (13 species). From the present study we contributed six new records endemic to Campeche, including the first record of the genus Codiophyllum for the Western Atlantic Ocean. Our data on diversity, biomass, periodicity and growth rates of red algal drifts allow us to suggest that the Campeche and Yucatan drifts are a sustainable source of raw material.

  • eucheumatopsis isiformis gen comb nov Solieriaceae rhodophyta from the yucatan peninsula to accommodate eucheuma isiforme
    Phycologia, 2019
    Co-Authors: Maria Luisa Nunezresendiz, Kurt M Dreckmann, Abel Senties, Michael J Wynne, Hilda Leontejera
    Abstract:

    On the basis of COI-5P, cox2–3 spacer, RuBisCo spacer, and rbcL sequences, Eucheuma was resolved as a paraphyletic genus in the Solieriaceae. Specimens of E. isiforme from the Yucatan Peninsula and Florida form an independent lineage in the family that was also different from E. denticulatum, the generitype. To accommodate this species, we described Eucheumatopsis as a new genus that differs from Eucheuma both molecularly and geographically. Because the four molecular markers used and morphological characters did not support the independence of Eucheuma isiforme var. denudatum from E. isiforme var. isiforme, we have proposed to no longer recognize var. denudatum as a separate variety.

  • 4 variacion genetica en meristotheca cylindrica Solieriaceae rhodophyta en campeche mexico genetic variation of meristotheca cylindrica Solieriaceae rhodophyta in campeche mexico
    Hidrobiologica, 2018
    Co-Authors: Carlos Adan Palma Ortiz, Kurt M Dreckmann, Maria Luisa Nunez Resendiz, Abel Senties
    Abstract:

    RESUMEN Antecedentes . Los estudios enfocados en la variacion genetica son fundamentales para evidenciar procesos de radiacion adaptativa y especiacion. En este sentido, los marcadores moleculares han jugado un papel protagonico durante las pasadas tres decadas. Objetivos . Meristotheca cylindrica es una especie comun en las costas de Campeche, importante economicamente por la presencia de carragenanos en su pared celular; sin embargo, despliega un espectro de variabilidad morfologica que la confunde con especies pertenecientes a categorias taxonomicas diferentes, razon que la hace un buen ejemplo para analizar la probable variacion genetica al interior de sus poblaciones. Metodos . Utilizando secuencias de ADN plastidial de la region espaciadora de laRuBisCo, y ADN mitocondrial de la region espaciadora cox 2-3,fue posible determinarla variacion genetica en 45 individuos de M. cylindrica procedentesde cinco poblaciones registradaspara Campeche. Resultados. La region espaciadora de la RuBisCo arrojo cuatro haplotipos (R1-R4), de los cuales R1 fue el mas abundante; la diversidad haplotipica fue similar en las poblaciones (Hd<0.4) y la red haplotipica revelomoderada divergencia entre las poblaciones. La region espaciadora cox 2-3nos permitio encontrar nueve haplotipos (C1-C9); la poblacion con la mayor diversidad haplotipica fue Sabancuy (Hd=0.7), en contraste con Bahia Tortuga, en la que solo se presento un haplotipo (por tanto Hd=0). La red haplotipica con la region espaciadora cox 2-3 revelo estructura total. Conclusiones. La distribucion de los haplotipos con ambos genes, y la estructura mostrada en las redes haplotipicas, sugieren un evento de especiacion para estos grupos. Finalmente, discutimos el aislamiento geografico del suroeste del Golfo de Mexico como un escenario evolutivo plausible. Abstract Backgrounds . Studies centered on genetic variation are nuclear to show processes such as adaptive radiation, and speciation. In this sense, the current molecular protocols have proved to be a very useful tool for at least three decades. Objectives. Meristotheca cylindrica is a common species along the coast of Campeche, at the south western Gulf of Mexico, it is, also, an economically important resource because the carrageenans present in its cell walls. However, it displays a spectrum of morphological variation close to taxa not taxonomically related. This feature alone, makes M. cylindrica a perfect system to analyze a probable genetic variation within its known populations. Methods. Using DNA plastidial sequences of the spacer region of RuBisCo, and the spacer mitochondrial region cox2 -3, it was possible to show genetic variation in 45 individuals of M. cylindrica from five populations. Results. RuBisCo produced four haplotypes (R1-R4), R1 being dominant. Haplotypic diversity was similar through the populations (Hd=~0.2, ~0.38), but the haplotypic net reflected moderated divergence between populations. The cox 2-3 spacer analysis, otherwise, shows up nine haplotypes (C1-C9). The population with the higher haplotypic diversity was Sabancuy (Hd=0.7), in contrast with Bahia Tortuga, in which we found just one haplotype (so,Hd=0). Conclusions. The haplotypic network, through the spacer region cox 2-3 analysisrevealsa totalgenetic structure. Haplotypic distribution (sustained with both genes), and the genetic structure evidenced by the haplotypic net, suggest an event of speciation in course. We discuss the geographical isolation of the South Western Gulf of Mexico as an evolutionary scenario..

  • tepoztequiella rhizoidea gen et sp nov Solieriaceae rhodophyta from the yucatan peninsula mexico
    Phycologia, 2018
    Co-Authors: Maria Luisa Nunez Resendiz, Giuseppe C. Zuccarello, Kurt M Dreckmann, Abel Senties, Hilda Leontejera
    Abstract:

    Abstract Molecular methods have greatly aided in discovering new diversity in many cryptic algal groups. Molecular-assisted species discovery has focused morphological analyses on previously overlooked taxa, leading to a better understanding of diversity and evolutionary patterns. The Yucatan Peninsula, as a junction of North and South American Atlantic floras, is very diverse and, while a well-explored area, continues to reveal new species. Our studies in this area have revealed a new cylindrical member of the Solieriaceae. Based on COI-5P, rbcL and RuBisCo spacer sequences, we show that this entity is phylogenetically unique. Its position in phylogenetic analyses, combined with morphological characters and the genetic divergence from other species and genera within the family, strongly supports the establishment of Tepoztequiella rhizoidea gen. & sp. nov. The diagnostic character of T. rhizoidea is the presence of many rhizoids arising from medullary filaments and from the cells of the inner cortex.

Satoshi Shimada - One of the best experts on this subject based on the ideXlab platform.

  • photosynthetic performance of the red alga solieria pacifica Solieriaceae from two different depths in the sublittoral waters of kagoshima japan
    Journal of Applied Phycology, 2017
    Co-Authors: Iris Ann Borlongan, Satoshi Shimada, Gregory N Nishihara, Ryuta Terada
    Abstract:

    Photosynthetic responses to photosynthetically active radiation (PAR) and temperature were examined in the red alga Solieria pacifica from deep (35 m) and shallow (5 m) portions of the sublittoral zone in Kagoshima, Japan. Dissolved oxygen sensors and pulse-amplitude modulated (PAM) fluorometry were used for the measurements of net photosynthesis, dark respiration rates, and photochemical efficiency. The photosynthetic performances of the deep- and shallow-water ecotypes provided substantial evidence of their adaptation to the ambient PAR and temperature conditions of their respective habitats. Both algal samples showed different temperature optima for photosynthesis: 19.5–19.9 °C for S. pacifica from Mageshima (MAG) and 18.6–27.0 °C for species from Yatsushiro Bay (YAT), that reflect the temperature ranges in the 35- and 5-m depths of the sublittoral zone, respectively. Maximum net photosynthetic rate (P max = 3.73 μg O2 gfw −1 min−1), compensation PAR (E c = 21 μmol photons m−2 s−1), and saturation PAR (E k = 131 μmol photons m−2 s−1) were higher in YAT S. pacifica than in MAG samples (P max = 1.55 μg O2 gfw −1 min−1, E c = 3 μmol photons m−2 s−1, E k = 15 μmol photons m−2 s−1), which can be attributed to the higher PAR levels experienced by the seaweeds occurring at depths of 5 m. The large depressions in effective quantum yields (Φ PSII) after chronic PAR exposures and failed recovery in maximum quantum yields (F v /F m) after dark acclimation of MAG S. pacifica suggest a greater tendency for photodamage in the deep-water ecotype. As for the shallow-water S. pacifica (YAT), complete recovery occurred only at 20 °C. Low temperature limitation may account for the decreased gross photosynthetic rates and delayed recovery of post-dark acclimation F v /F m of YAT S. pacifica at temperatures below their optimum, which can occur during winter.

  • effects of temperature and par on the photosynthesis of kappaphycus sp Solieriaceae rhodophyta from okinawa japan at the northern limit of native kappaphycus distribution in the western pacific
    Phycologia, 2017
    Co-Authors: Iris Ann Borlongan, Satoshi Shimada, Gregory N Nishihara, Ryuta Terada
    Abstract:

    Abstract: The successful cultivation of the Japanese Kappaphycus sp. (K. striatus auctorum japonicorum) in Okinawa, Japan, requires the detailed understanding of its physiological response to environmental factors. The photosynthetic performance of this native red alga was investigated under a variety of temperature and photosynthetic active radiation (PAR) conditions by employing methods based on pulse amplitude modulation–chlorophyll fluorometry and dissolved oxygen sensors. The net photosynthesis–irradiance (P–E) curve at 24°C revealed that the compensation (Ec) and saturation (Ek) irradiances were 26 [95% Bayesian prediction interval (BPI), 11–29 μmol photons m−2 s−1] and 140 (95% BPI, 98–192) μmol photons m−2 s−1, respectively. No inhibition in oxygenic evolution and quantum yield was observed at the highest PAR of 1000 μmol photons m−2 s−1. However, the ability of the seaweed to recover from photoinhibition was complicated following long-term PAR exposures at 18°C but not at 28°C. The Japanese Kappa...

  • the effect of irradiance and temperature on the photosynthesis and growth of a cultivated red alga kappaphycus alvarezii Solieriaceae from vietnam based on in situ and in vitro measurements
    Journal of Applied Phycology, 2016
    Co-Authors: Ryuta Terada, Satoshi Shimada, Gregory N Nishihara, Keisaku Shioya, Shigeo Kawaguchi
    Abstract:

    The effect of irradiance and temperature on the photosynthesis and growth of a Vietnamese-cultivated red alga, Kappaphycus alvarezii, was determined by laboratory and field measurements. Dissolved oxygen sensors and pulse amplitude modulated (PAM) fluorometry were used for the measurements of photosynthetic efficiency. A Diving-PAM revealed that in situ measurements of the effective quantum yield (ΦPSII) were negatively correlated with incident irradiance. ΦPSII decreased as irradiance increased at noon and recovered in the evening, suggesting photo-inhibition. A model of the net photosynthesis–irradiance (P-E) relationship determined in a laboratory experiment at 26 °C revealed that the net photosynthetic rate quickly increased at irradiances below the estimated saturation irradiance of 154 μmol photons m−2 s−1 (95 % Bayesian credible interval (BCI) of 117–203 μmol photons m−2 s−1). Gross photosynthesis and dark respiration under the laboratory measurements were also determined over a range of temperatures (8–42 °C), revealing that the gross photosynthetic rates of 8.0 (BCI 7.03–9.59) μg O2 gww−1 min−1 at 31.1 (BCI 30.2–32.0)°C, and the dark respiration rate increased exponentially from a low of 0.22 μg O2 gww−1 min−1 at 10 °C to a high of 1.88 μg O2 gww−1 min−1 at 42 °C. The estimated highest value of the maximum quantum yield (ΦPSII at 0 μmol photons m−2 s−1 = Fv/Fm) determined with the Imaging-PAM and occurred at 22.2 (BCI 20.8–23.5)°C and was 0.51 (BCI 0.48–0.54). Relative growth rate (RGR) and the survival rate after 2 weeks of laboratory culture showed that the relatively high growth rates (ca. 1.5 %) occurred at 28 and 32 °C; however, mortality was 100 % at 36 °C. This species is considered to be well-adapted to the natural temperature range of study site; however, it is likely close to the marginal temperature conditions. Furthermore, daytime incident irradiance on the frond under fine clear sky might be too strong for the effective photosynthesis of this species, suggesting that optimum irradiance for gross photosynthesis with the minimum decline of ΦPSII seems to be much lower.

  • new red alga meristotheca imbricata Solieriaceae gigartinales from japan
    Phycological Research, 2008
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Shigeo Kawaguchi, Michio Masuda
    Abstract:

    SUMMARY A new red alga Meristotheca imbricata Faye et Masuda (Solieriaceae, Gigartinales) was described on the basis of specimens collected from southern Japan. Although this species might have been for a long time included in the concept of M. coacta Okamura, until recently a very poorly known alga, it is distinguished from the latter by the following features: (i) each thallus consists of one primary blade and several secondary blades, the latter arising from the apical or subapical portion of terminal segments of the primary blade; (ii) the individual blades are repeatedly dichotomously divided into linear segments of which margins are neither undulate nor crispate, and are fleshy, imbricate, frequently anastomosing and often acervate; (iii) each tetrasporangial initial is attached by a basal pit-connection to the parental cell, and the position of the pit-connection changes from basal to lateral by inward growth of the tetrasporangium; and (iv) the carpogonial branches sometimes have a one-celled sterile lateral.

  • Taxonomic features of the red alga Meristotheca coacta (Solieriaceae, Gigartinales)
    Phycological Research, 2007
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Shigeo Kawaguchi, Michio Masuda
    Abstract:

    SUMMARY Vegetative and reproductive structures of the little-known red alga, Meristotheca coacta Okamura (Solieriaceae, Gigartinales) were described on the basis of specimens collected from three localities in southern Japan, including an island close to the lectotype locality. Meristotheca coacta was shown to be a strongly supported monophyletic clade in our rbcL analyses. The taxonomic features of this species were reassessed. This species is characterized as follows: (i) the thalli consist of relatively thick (300–1400 μm from the uppermost to basal regions), elastic and rose-red blades; (ii) the blades are irregularly lobed and branched into variously shaped segments with undulate and crispate margins; (iii) tetrasporangial initials are laterally attached to their parental cells and the lateral pit-connections remain in mature tetrasporangia; (iv) gametophytes are dioecious; (v) carpogonial branches are three-celled (occasionally two- or four-celled); (vi) a darkly staining auxiliary cell complex is present and recognizable prior to diploidization; and (vii) cystocarps are produced along (or near) the margins of the blades and on the marginal proliferations and lack spinous outgrowths.

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  • new red alga meristotheca imbricata Solieriaceae gigartinales from japan
    Phycological Research, 2008
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Shigeo Kawaguchi, Michio Masuda
    Abstract:

    SUMMARY A new red alga Meristotheca imbricata Faye et Masuda (Solieriaceae, Gigartinales) was described on the basis of specimens collected from southern Japan. Although this species might have been for a long time included in the concept of M. coacta Okamura, until recently a very poorly known alga, it is distinguished from the latter by the following features: (i) each thallus consists of one primary blade and several secondary blades, the latter arising from the apical or subapical portion of terminal segments of the primary blade; (ii) the individual blades are repeatedly dichotomously divided into linear segments of which margins are neither undulate nor crispate, and are fleshy, imbricate, frequently anastomosing and often acervate; (iii) each tetrasporangial initial is attached by a basal pit-connection to the parental cell, and the position of the pit-connection changes from basal to lateral by inward growth of the tetrasporangium; and (iv) the carpogonial branches sometimes have a one-celled sterile lateral.

  • Taxonomic features of the red alga Meristotheca coacta (Solieriaceae, Gigartinales)
    Phycological Research, 2007
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Shigeo Kawaguchi, Michio Masuda
    Abstract:

    SUMMARY Vegetative and reproductive structures of the little-known red alga, Meristotheca coacta Okamura (Solieriaceae, Gigartinales) were described on the basis of specimens collected from three localities in southern Japan, including an island close to the lectotype locality. Meristotheca coacta was shown to be a strongly supported monophyletic clade in our rbcL analyses. The taxonomic features of this species were reassessed. This species is characterized as follows: (i) the thalli consist of relatively thick (300–1400 μm from the uppermost to basal regions), elastic and rose-red blades; (ii) the blades are irregularly lobed and branched into variously shaped segments with undulate and crispate margins; (iii) tetrasporangial initials are laterally attached to their parental cells and the lateral pit-connections remain in mature tetrasporangia; (iv) gametophytes are dioecious; (v) carpogonial branches are three-celled (occasionally two- or four-celled); (vi) a darkly staining auxiliary cell complex is present and recognizable prior to diploidization; and (vii) cystocarps are produced along (or near) the margins of the blades and on the marginal proliferations and lack spinous outgrowths.

  • characterization of the edible red alga meristotheca papulosa Solieriaceae gigartinales from japan
    Phycological Research, 2005
    Co-Authors: Etienne Jean Faye, Satoshi Shimada, Shigeo Kawaguchi, Michio Masuda
    Abstract:

    SUMMARY The vegetative and reproductive morphology of the edible red alga Meristotheca papulosa (Montagne) J. Agardh (Solieriaceae) was reexamined based on material collected from various localities in Japan. Although the habit of the blades is variable according to the length and width of the axes, the frequency of branching and the abundance of proliferations, rbcL sequence analyses indicate their conspecificity. M. papulosa displays four distinctive reproductive features (presence of an auxiliary cell complex, occurrence of cystocarps on marginal proliferations and the blade surface (although very rare) in addition to the margins of axes, frequent production of spinose outgrowths on the pericarp and tetrasporangial initials typically basally attached to their parental cells) that have not been reported for M. papulosa from other areas. Although these features might warrant recognition of the Japanese entity as a separate species, a better understanding of their possible taxonomic value requires comparisons with M. papulosa from other geographic regions, including the type locality.

  • reassessment of the little known western african red alga anatheca montagnei gigartinales Solieriaceae on the basis of morphology and rbcl sequences
    European Journal of Phycology, 2005
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Michio Masuda
    Abstract:

    Vegetative and reproductive structures, including the anatomy of young blades, spermatangia, female reproductive organs, post-fertilization development, and tetrasporangia were examined for the little-known red alga, Anatheca montagnei, from Hann Bay, Dakar, Senegal, western Africa, close to the type locality. Carpogonial branches and auxiliary cells develop on cortical filaments in slightly raised nemathecium-like structures. The fertilized carpogonium produces two unbranched, non-septate connecting filaments. The auxiliary cell is one of the intercalary cortical cells, and, together with the surrounding darkly-staining cortical cells, constitutes an auxiliary cell complex that is visible prior to diploidization. The diploidized auxiliary cell cuts off a single gonimoblast initial, which in turn divides to form a placentate cystocarp without distinct enveloping filaments. The cystocarps are contained in cystocarpic protuberances or papillae that are situated on the surfaces and margins of the female blad...

  • A new red algal species Meristotheca dakarensis (Solieriaceae, Gigartinales) from Senegal, western Africa, with comments on the relegation of Meristiella Cheny to synonymy with Meristotheca J. Agardh
    Cryptogamie Algologie, 2004
    Co-Authors: Etienne Jean Faye, Kazuhiro Kogame, Satoshi Shimada, Michio Masuda
    Abstract:

    L'algue rouge marine Meristotheca dakarensis Faye et Masuda, sp. nov. (Solieriaceae, Gigartinales) est decrite a partir de materiel recolte a Dakar, Senegal (Afrique occidentale). Elle se distingue des autres membres du genre par la combinaison suivante de caracteres morphologiques : 1) ramification irregulierement dichotomique, epaisse, molle, resistante, a lames decombantes de 10-30 cm de longueur et de 500-1200 μm d'epaisseur, avec des segments de 1-4 cm de largeur; 2) initiales des tetrasporocystes se decoupant a la base de leurs cellules-meres; 3) gametophytes dioiques; 4) rameaux carpogoniaux de (2-)3(-4) cellules, dont la cellule basale porte rarement une seule cellule laterale; 5) la presence d'un complexe cellule auxiliaire + cellules vegetatives adjacentes; et 6) production de nombreux cystocarpes protuberants sur les surfaces dorsales (moins frequemment sur les surfaces ventrales et les marges) au milieu des parties distales des lames. Les analyses de phylogenie moleculaire basees sur les sequences du gene rbcL indiquent que Meristotheca dakarensis est contenu dans un clade mono-phyletique qui englobe des especes couramment placees a la fois dans Meristiella et Meristotheca; le clade devenant paraphyletique avec la reconnaissance des deux genres. Les distances par comparaison des sequences deux a deux entre M. dakarensis et les autres especes du complexe generique sont grandes, atteignant de 44 bp a 64 bp (4,3 % a 5,1 %). Les caracteres anatomiques precedemment utilises pour distinguer Meristiella Cheney de Meristotheca J. Agardh (l'absence de nemathecie carpogoniale, la presence d'un complexe cellule auxiliaire + cellules vegetatives adjacentes, les cystocarpes portant des epines bien visibles) se montrent repartis de facon non coherente parmi les especes du clade; il est donc propose, compte tenu des resultats des donnees morphologiques et moleculaires, d'inclure Meristiella dans Meristotheca, les nouvelles combinaisons rendues necessaires etant faites en consequence.

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