Faculty Profiles - TERADA Ryuta

Papers - TERADA Ryuta

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Takeo Horiguchi, Rui Moriya, Sohail K. Pinto, Ryuta Terada . Pyramidodinium spinulosum sp nov. (Dinophyceae), a sand-dwelling non-motile dinoflagellate from the seafloor (36m deep) off Mageshima Island, Kagoshima, Japan . Phycological Research65 ( 4 ) 272 - 279 2017.10Reviewed International journal

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

A new species of benthic marine dinoflagellate, Pyramidodinium spinulosumHoriguchi, Moriya, Pinto & Terada is described from the deep (36m) seafloor off Mageshima Island, Kagoshima Prefecture, Japan in the subtropical region of the northwest Pacific. The life cycle of the dinoflagellate consists of a dominant, attached, dome-shaped, vegetative form and short-lasting, motile cell. Asexual reproduction takes place by the formation of two motile cells within each non-motile cell. The released motile cells swim only for a short period and transform directly into the dome-shaped vegetative form. The duration of the cell cycle varies and can be extremely long, ranging 5-38days under culture conditions. The non-motile cell is enclosed by a cell wall and its surface is covered with many (80-130) spines of various length. The dinoflagellate is photosynthetic and contains many (more than 50) discoidal chloroplasts. Phylogenetic analysis reveals that the dinoflagellate is closely related to the type species of the genus Pyramidodinium, P. atrofuscum which also possesses a dominant, attached, non-motile form. However, P. spinulosum can be clearly distinguished from P. atrofuscum by the cell shape (dome-shaped vs. pyramid-shaped) and surface ornamentation (spines vs. wart-like processes) of the non-motile form. Based on these morphological differences together with molecular evidence, it was concluded that this organism from a deep water sand sample should be described as a second species of the genus Pyramidodinium, P. spinulosum.

DOI： 10.1111/pre.12183

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Scopus

Iris Ann Borlongan, Gregory N. Nishihara, Satoshi Shimada, Ryuta Terada . Photosynthetic performance of the red alga Solieria pacifica (Solieriaceae) from two different depths in the sublittoral waters of Kagoshima, Japan . Journal of Applied Phycology 2017.7Reviewed International journal

Stacy A. Krueger-Hadfield, Nicole M. Kollars, Allan E. Strand, James E. Byers, Sarah J. Shainker, Ryuta Terada, Thomas W. Greig, Mareike Hammann, David C. Murray, Florian Weinberger, Erik E. Sotka . Genetic identification of source and likely vector of a widespread marine invader . Ecology and Evolution7 ( 12 ) 4432 - 4447 2017.6Reviewed International coauthorship International journal

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

The identification of native sources and vectors of introduced species informs their ecological and evolutionary history and may guide policies that seek to prevent future introductions. Population genetics provides a powerful set of tools to identify origins and vectors. However, these tools can mislead when the native range is poorly sampled or few molecular markers are used. Here, we traced the introduction of the Asian seaweed Gracilaria vermiculophylla (Rhodophyta) into estuaries in coastal western North America, the eastern United States, Europe, and northwestern Africa by genotyping more than 2,500 thalli from 37 native and 53 non-native sites at mitochondrial cox1 and 10 nuclear microsatellite loci. Overall, greater than 90% of introduced thalli had a genetic signature similar to thalli sampled from the coastline of northeastern Japan, strongly indicating this region served as the principal source of the invasion. Notably, northeastern Japan exported the vast majority of the oyster Crassostrea gigas during the 20th century. The preponderance of evidence suggests G. vermiculophylla may have been inadvertently introduced with C. gigas shipments and that northeastern Japan is a common source region for estuarine invaders. Each invaded coastline reflected a complex mix of direct introductions from Japan and secondary introductions from other invaded coastlines. The spread of G. vermiculophylla along each coastline was likely facilitated by aquaculture, fishing, and boating activities. Our ability to document a source region was enabled by a robust sampling of locations and loci that previous studies lacked and strong phylogeographic structure along native coastlines.

DOI： 10.1002/ece3.3001

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Scopus

PubMed

Takeo Horiguchi, Rui Moriya, Sohail K. Pinto, Ryuta Terada . Pyramidodinium spinulosum sp. nov. (Dinophyceae), a sand-dwelling non-motile dinoflagellate from the seafloor (36 m deep) off Mageshima Island, Kagoshima, Japan . Phycological Research63 ( 3 ) 3077 - 3088 2017.6Reviewed International journal

Iris Ann Borlongan, Grevo S. Gerung, Shigeo Kawaguchi, Gregory N. Nishihara, Ryuta Terada . Thermal and PAR effects on the photosynthesis of Eucheuma denticulatum and Kappaphycus striatus (so-called Sacol strain) cultivated in shallow bottom of Bali, Indonesia . Journal of Applied Phycology29 ( 1 ) 395 - 404 2017.2Reviewed International coauthorship International journal

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer-Nature

Photosynthetic responses to various temperature and PAR conditions of two carrageenophytes, Eucheuma denticulatum and Kappaphycus striatus (so-called Sacol strain), cultured in shallow areas of Bali, Indonesia, were examined using dissolved oxygen measurements and pulse-amplitude-modulated (PAM) fluorometry. Net photosynthesis-irradiance (P-E) curves at 26 A degrees C revealed that the values of P (max) for E. denticulatum and K. striatus were 13.76 and 5.02 mu g O-2 g(fw) (-1) min(-1) (12.38-15.12 and 4.55-5.50 mu g O-2 g(fw) (-1) min(-1), 95 % Bayesian prediction interval (BPI)), respectively. Photoinhibition was not observed even at 1000 mu mol photons m(-2) s(-1). Gross photosynthesis and respiration characteristics over a range of temperatures (8-36 A degrees C) revealed optimum temperature for photosynthesis to be 31.1 A degrees C for E. denticulatum, and 31.6 A degrees C for K. striatus. These characteristics of photosynthesis indicate that both farmed seaweeds are well adapted to the light and temperature conditions of the cultivation site. However, studies on longer timescales for photochemical efficiency, photosynthesis, and respiration are still needed to determine their limits of tolerance. We also hypothesize that higher values of photosynthetic parameters for E. denticulatum suggest that this species is relatively superior in productivity under optimal conditions, conditional on the farming method.

DOI： 10.1007/s10811-016-0956-7

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Scopus

Iris Ann G. Borlongan, Grevo S. Gerung, Gregory N. Nishihara, Ryuta Terada . Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia . Phycological Research65 ( 1 ) 69 - 79 2017.1Reviewed International coauthorship International journal

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Knowledge concerning the effects of several abiotic factors on the physiology of carrageenophytes is essential both in ecological and economic standpoints, to ensure their sufficient supply for the sustainability of seaweed-based industries. This paper presents the photosynthetic characteristics of farmed carrageenophytes, Eucheuma denticulatum and Kappaphycus alvarezii [brown (BRN) and green (GRN) color morphotypes] from Sulawesi Utara (Sulawesi Island), Indonesia, as determined by examining their photosynthetic response across different temperatures and irradiances using dissolved oxygen measurements and pulse-amplitude modulated fluorometer. Net photosynthesis-irradiance (P-E) curves at 26 degrees C revealed that net photosynthetic rates of the three seaweeds gradually increased until the estimated saturation irradiances (E-k) of 58 mu mol photons m(-2) s(-1) (49-68 mu mol photons m(-2) s(-1), 95% Bayesian prediction intervals; BPI) for E. denticulatum, and 158 and 143 mu mol photons m(-2) s(-1) (134-185 and 99-203 mu mol photons m(-2) s(-1), 95% BPI) for BRN and GRN K. alvarezii, respectively; and that no photoinhibition was observed at the highest irradiance of 1000 mu mol photons m(-2) s(-1). All seaweed samples exhibited photosynthetic tolerance to high PAR as shown by their recovery in maximum quantum yields (F-v/F-m) following chronic exposures; as well as tolerance over a broad range of temperature, which is from 19 to 33 degrees C for E. denticulatum, 20-29 degrees C for BRN K. alvarezii, and 17-32 degrees C for GRN K. alvarezii. Temperature responses of these carrageenophytes indicated that they were well-adapted to the annual seawater temperatures in the cultivation site; however, they are also likely close to threshold levels for thermal inhibition, given the decline in F-v/F-m above 30 degrees C.

DOI： 10.1111/pre.12155

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Scopus

Sohail Keegan Pinto, Ryuta Terada, Takeo Horiguchi . Testudodinium magnum sp. nov. (Dinophyceae), a novel marine sand-dwelling dinoflagellate from subtropical Japan . Phycologia56 ( 2 ) 136 - 146 2017Reviewed International journal

Language：English Publishing type：Research paper (scientific journal) Publisher：Allen Press

A new marine benthic dinoflagellate, Testudodinium magnum sp. nov., was described from a sand sample collected on the seafloor at a depth of 35 m off Mageshima Island, Kagoshima, Japan. The dinoflagellate possessed the characteristic features of the genus Testudodinium, but was distinguished by its extremely large size and pebbled dorsal surface of the hyposome, caused by the presence of numerous nodules. The cells of this dinoflagellate possessed a dominant sessile and a rare motile form that were morphologically distinct from each other: The sessile form was larger and the small rounded episome with longitudinal furrow was completely embedded in the hyposome; the motile form was smaller and the episome was only partly embedded in the hyposome. The ultrastructural investigations revealed the presence of a large, circular, starch-sheathed pyrenoid whose matrix was traversed by randomly arranged thylakoid lamellae. The chloroplasts formed a network radiating outward from the pyrenoid. Uniquely, this dinoflagellate possessed internal props - structures that spanned the thickness of the cell and were fibrous in nature. The props were numerous and passed through organelles and cell contents. Phylogenetic analyses based on the small-subunit ribosomal DNA gene sequences placed this dinoflagellate firmly within the Testudodinium clade with high support. On the basis of the morphological features and phylogenetic analyses, we concluded that this dinoflagellate was a new species in the genus Testudodinium.

DOI： 10.2216/16-59.1

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Scopus

Iris Ann Borlongan, Gregory N. Nishihara, Satoshi Shimada, Ryuta Terada . 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 . Phycologia56 ( 4 ) 444 - 453 2017Reviewed International journal

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Allen Press

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 degrees C revealed that the compensation (E-c) and saturation (E-k) irradiances were 26 [95% Bayesian prediction interval (BPI), 11-29 mu mol photons m(-2) s(-1)] and 140 (95% BPI, 98-192) mu mol photons m(-2) s(-1), respectively. No inhibition in oxygenic evolution and quantum yield was observed at the highest PAR of 1000 mu mol photons m(-2) s(-1). However, the ability of the seaweed to recover from photoinhibition was complicated following long-term PAR exposures at 18 degrees C but not at 28 degrees C. The Japanese Kappaphycus sp. showed photosynthetic optima at 17.4-29.1 degrees C, derived from the F-v/F-m and gross photosynthesis-temperature models, respectively. These characteristic results were closely related to the depth of its habitat and its northern limit of distribution in Okinawa as influenced primarily by seawater temperature. Findings of this study should be useful to the development of culture systems adapted for subtropical waters, whether for commercial purpose or for conservation of natural communities.

DOI： 10.2216/16-140.1

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Scopus

Stacy A. Krueger-Hadfield, Gustavo Hernández Carmona, Ryuta Terada, Juan Manuel López-Vivas, Rafael Riosmena-Rodríguez . New record of the introdcued seaweed Gracilaria parvispora in Baja California-A note on vergara-rodarte et al., (2016) . Cryptogamie Alglorogie37 ( 4 ) 257 - 263 2016.12Reviewed International coauthorship International journal

Yuki Watanabe, Gregory N. Nishihara, Ryuta Terada . The effect of irradiance and temperature on the photosynthesis of two red algal gametophytes, Pyropia dentata and Pyropia seriata, from Kyushu Island, Japan . Japanese Journal of Phycology64 ( 3 ) 131 - 138 2016.11Reviewed

Ryuta Terada, Triet Duy Vo, Gregory N. Nishihara, Kazuya Matsumoto, Shogo Kokubu, Yuki Watanabe, Shigeo Kawaguchi . The effect of PAR and temperature on the photosynthesis of two Vietnamese species of Sargassum, Sargassum mcclurei and Sargassum oligocystum, based on the field and laboratory measurements . Phycological Rsearch64 ( 4 ) 230 - 240 2016.8Reviewed International coauthorship International journal

Yuki Watanabe, Hideki Yamada, Takayuki Mine, Yoshio Kawamura, Gregory N. Nishihara, Ryuta Terada . Photosynthetic responses of Pyropia yezoensis f. narawaensis (Bangiales, Rhodophyta) to a thermal and PAR gradient vary with the life-history stage . Phycologia55 ( 6 ) 665 - 672 2016.8Reviewed International journal

Stacy A. Krueger-Hadfield, Nicole M. Kollars, James E. Byers, Thomas W. Greig, Mareike Hammann, David C. Murray, Courtney J. Murren, Allan E. Strand, Ryuta Terada, Florian Weinberger, Erik E. Sotka . Invasion of novel habitats uncouples haplo-diplontic life cycles . Molecular Ecology25 ( 16 ) 3801 - 3816 2016.7Reviewed International coauthorship International journal

Ga Hun Boo, Line Le Gall, Kathy Ann Miller, D. Wilson Freshwater, Thomas Wernberg, Ryuta Terada, Kyung Ju Yoon, Sung Min Boo . A novel phylogeny of the Gelidiales (Rhodophyta) based on five genes including the nuclear CesA, with descriptions of Orthogonacladia gen. nov. and Orthogonacladiaceae fam. nov. . Molecular Phylogenetics and Evolution101 359 - 372 2016.5Reviewed International coauthorship International journal

Ryuta Terada, Yuki Watanabe, Midori Fujimoto, Iori Tatamidani, Shogo Kokubu, Gregory N. Nishihara . The effect of PAR and temperature on the photosynthetic performance of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Kagoshima, Japan . Journal of Applied Phycology28 ( 2 ) 1255 - 1263 2016.4Reviewed International journal

Ryuta Terada, Yuki Watanabe, Yoshiki Nakazaki, Satoru Senokuchi . Endangered Algae and Seagrass in the Satsunan Islands, Kagoshima Prefecture . Kagoshima University Research Center for Pacific Islands, Occasional Paper57 77 - 79 2016.3

Ryuta Terada, Soku Shikada, Yuki Watanabe, Yoshiki Nakazaki, Kazuya Matsumoto, Jumpei Kozono, Naoko Saino, Gregory N. Nishihara . Effect of PAR and temperature on the photosynthesis of Japanese alga, Ecklonia radicosa (Laminariales), based on field and laboratory measurements . Phycologia55 ( 2 ) 178 - 186 2016.2Reviewed International journal

Ryuta Terada, Triet Duy Vo, Gregory N. Nishihara, Keisaku Shioya, Satoshi Shimada, Shigeo Kawaguchi . The effect of irradiance and temperature on the photosynthesis and growth of a cultivated red alga Kappaphycus alvarezii (Solieriaceae) from Vietnam, based on the in situ and in vitro measurements . Journal of Applied Phycology28 ( 2 ) 457 - 467 2016.2Reviewed International coauthorship International journal

Gregory N. Nishihara, Chizuru Yamada, Ryutaro Kimura, Ryuta Terada . Under slow flow conditions, daily rates of canopy photosynthesis of marine macrophytes were insensitive to model choice and flow-rate . Phycological Research63 ( 4 ) 307 - 317 2015.7Reviewed International journal

Midori Fujimoto, Gregory N. Nishihara, Anchana Prathep, Ryuta Terada . The effect of irradiance and temperature on the photosynthesis of an agarophyte, Gelidiella acerosa (Gelidiales, Rhodophyta), from Krabi, Thailand . Journal of Applied Phycology27 ( 3 ) 1235 - 1242 2015.6Reviewed International coauthorship International journal

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Papers - TERADA Ryuta