IF 3.2 3区生物学

Algae Pub Date : 2023-03-15 DOI: 10.4490/algae.2023.38.2.28

Jin Hee Ok, H. Jeong, A. Lim, Hee Chang Kang, Ji Hyun You, Sang Ah Park, S. Eom

{"title":"Lack of mixotrophy in three Karenia species and the prey spectrum of Karenia mikimotoi (Gymnodiniales, Dinophyceae)","authors":"Jin Hee Ok, H. Jeong, A. Lim, Hee Chang Kang, Ji Hyun You, Sang Ah Park, S. Eom","doi":"10.4490/algae.2023.38.2.28","DOIUrl":"https://doi.org/10.4490/algae.2023.38.2.28","url":null,"abstract":"Exploring mixotrophy of dinoflagellate species is critical to understanding red-tide dynamics and dinoflagellate evolution. Some species in the dinoflagellate genus Karenia have caused harmful algal blooms. Among 10 Karenia species, the mixotrophic ability of only two species, Karenia mikimotoi and Karenia brevis, has been investigated. These species have been revealed to be mixotrophic; however, the mixotrophy of the other species should be explored. Moreover, although K. mikimotoi was previously known to be mixotrophic, only a few potential prey species have been tested. We explored the mixotrophic ability of Karenia bicuneiformis, Karenia papilionacea, and Karenia selliformis and the prey spectrum of K. mikimotoi by incubating them with 16 potential prey species, including a cyanobacterium, diatom, prymnesiophyte, prasinophyte, raphidophyte, cryptophytes, and dinoflagellates. Cells of K. bicuneiformis, K. papilionacea, and K. selliformis did not feed on any tested potential prey species, indicating a lack of mixotrophy. The present study newly discovered that K. mikimotoi was able to feed on the common cryptophyte Teleaulax amphioxeia. The phylogenetic tree based on the large subunit ribosomal DNA showed that the mixotrophic species K. mikimotoi and K. brevis belonged to the same clade, but K. bicuneiformis, K. papilionacea, and K. selliformis were divided into different clades. Therefore, the presence or lack of a mixotrophic ability in this genus may be partially related to genetic characterizations. The results of this study suggest that Karenia species are not all mixotrophic, varying from the results of previous studies.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42010932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Insight into the species identification and distribution of Grateloupiaceae (Halymeniales, Rhodophyta) having Grateloupia filicina-like morphology in the Northwest Pacific 西北太平洋丝状葡萄藤科植物（Halymeniales，Rhodophyta）的物种鉴定和分布

IF 3.2 3区生物学

Algae Pub Date : 2023-03-15 DOI: 10.4490/algae.2023.38.3.14.

S. Y. Kim, S. Boo, Hawn Su Yoon, M. Kim

{"title":"Insight into the species identification and distribution of Grateloupiaceae (Halymeniales, Rhodophyta) having Grateloupia filicina-like morphology in the Northwest Pacific","authors":"S. Y. Kim, S. Boo, Hawn Su Yoon, M. Kim","doi":"10.4490/algae.2023.38.3.14.","DOIUrl":"https://doi.org/10.4490/algae.2023.38.3.14.","url":null,"abstract":"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 distribution of G. filicina-like species in the Northwest Pacific, based on the rbcL sequences. A total of 118 specimens from 78 sites in Korea and Japan were collected from 2001 to 2021 and analyzed for their rbcL sequences. Additional 341 sequences downloaded from the GenBank were included in our comprehensive dataset. Based on these sequences, we documented the nomenclatural history and geographical distribution of the species, and commented on the application of species name. G. asiatica was the most abundant G. filicina-like species in the Northwest Pacific, and its high degree of morphological variation caused many misidentifications. In particular, G. dalianensis, G. serra and G. variata require reconsideration of their conspecificity with G. asiatica using more specimens from China. By contrast, G. oligoclora was presumed to be a heterotypic synonym of G. subpectinata. The occurrence of G. acuminata, G. ramosissima, and G. livida in Korea resulted from misidentifications with other species.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45856133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Control of oomycete pathogens during Pyropia farming and processing using calcium propionate 丙酸钙对Pyropia养殖加工过程中卵菌病原体的控制

IF 3.2 3区生物学

Algae Pub Date : 2023-03-15 DOI: 10.4490/algae.2023.38.3.8

Yong Tae Kim, R. Kim, Eunyoung Shim, H. Park, T. Klochkova, G. Kim

{"title":"Control of oomycete pathogens during Pyropia farming and processing using calcium propionate","authors":"Yong Tae Kim, R. Kim, Eunyoung Shim, H. Park, T. Klochkova, G. Kim","doi":"10.4490/algae.2023.38.3.8","DOIUrl":"https://doi.org/10.4490/algae.2023.38.3.8","url":null,"abstract":"The oomycete pathogens Pythium porphyrae, causing red rot disease, and Olpidiopsis spp. causing Olpidiopsis-blight, cause serious economic losses to Pyropia sea farms in Korea. During the washing step for Pyropia processing, these pathogens proliferate rapidly, significantly reducing the quality of the final product. To develop non-acidic treatments for these pathogens, various calcium salts were tested against the infectivity of P. porphyrae and Olpidiopsis pyropiae on Pyropia gametophytes, and calcium propionate was the most effective. When Pyropia blades were immersed in 10 mM calcium propionate for 1 h after inoculation with the oomycete pathogen, infection rate of both oomycete pathogens on day 2 was significantly lower (7.1%) than control (>95%). Brief incubation of Pyropia blades in calcium propionate also reduced the spread of infection. The infected area of Pyropia thallus was reduced to 14.3% of the control in 2 days after treatment with 100 mM calcium propionate for 30 s. In field experiments conducted in actual aquaculture farms, it has been shown that a brief 30 s wash every two weeks with 100 mM calcium propionate can effectively reduce the spread of oomycetes throughout the entire culture period. The above results suggest that calcium propionate can be a useful means for controlling the spread of oomycetes not only during laver processing but also during aquaculture.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49107102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Tropical red alga Compsopogon caeruleus: an indicator of thermally polluted waters of Europe in the context of temperature and oxygen requirements 热带红藻盲藻：欧洲热污染水域温度和氧气需求的指标

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.11.18

Andrzej S. Rybak, A. Woyda-Ploszczyca

{"title":"Tropical red alga Compsopogon caeruleus: an indicator of thermally polluted waters of Europe in the context of temperature and oxygen requirements","authors":"Andrzej S. Rybak, A. Woyda-Ploszczyca","doi":"10.4490/algae.2022.37.11.18","DOIUrl":"https://doi.org/10.4490/algae.2022.37.11.18","url":null,"abstract":"The red alga Compsopogon caeruleus can generally be found in tropical and subtropical waters worldwide. In addition to its natural habitats, this species may be found in waters that receive abnormally hot water, e.g., from powerhouses. To date, the presence of C. caeruleus has not been observed in thermally polluted lacustrine ecosystems in Poland, which has a moderate climate. The thalli of this red alga were found growing on Vallisneria spiralis in Licheńskie Lake. Importantly, this paper presents a previously unknown relationship between the temperature (20, 25, 30, 35, and 40°C) and oxygen requirements of C. caeruleus (based on ex situ measurements of O2 consumption by thalli). Surprisingly, 35°C can be the optimum temperature for C. caeruleus, and this temperature is higher than the values reported by some previous thermal analyses by approximately 10°C. Additionally, we reviewed and mapped the distribution of this nonnative and mesophilic red alga in natural / seminatural water ecosystems in Europe. Finally, we propose that the occurrence of C. caeruleus mature thalli can be a novel, simple and easy-to-recognize bioindicator of artificially and permanently heated waters in moderate climate zones by a regular discharge of postindustrial water.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46003625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Primary production by phytoplankton in the territorial seas of the Republic of Korea 大韩民国领海浮游植物的初级生产

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.11.28

A. Lim, H. Jeong

引用次数: 1

Identification and characterization of Dunaliella salina OH214 strain newly isolated from a saltpan in Korea 从韩国盐田新分离的盐藻OH214菌株的鉴定与鉴定

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.9.13

Minjae Kim, H. Oh, Khanh K. Nguyen, E. Jin

{"title":"Identification and characterization of Dunaliella salina OH214 strain newly isolated from a saltpan in Korea","authors":"Minjae Kim, H. Oh, Khanh K. Nguyen, E. Jin","doi":"10.4490/algae.2022.37.9.13","DOIUrl":"https://doi.org/10.4490/algae.2022.37.9.13","url":null,"abstract":"Carotenoids are effective antioxidants that are found in various photosynthetic organisms. Marine microalgae are an advantageous bioresource for carotenoid production because they do not compete with other crops for freshwater and arable land. This study reports a newly isolated Dunaliella strain from the Geumhong Saltpan on Yeongjong Island, West Sea, Korea. The new strain was isolated and classified as Dunaliella salina through phylogenetic analysis and was named the OH214 strain (Deposit ID: KCTC14434BP). The newly isolated strain can survive in a wide range of NaCl concentrations (0.3−5.0 M NaCl), but grows well in 0.6 to 1.5 M NaCl culture medium. Under high-light conditions (500 ± 10 μmol photons m-2 s-1), the cells accumulated three times more β-carotene than under low-light conditions (50 ± 5 μmol photons m-2 s-1). The cells accumulated 2.5-fold more β-carotene under nitrogen-deficient (1 mM KNO3) conditions (3.24 ± 0.36 μg 106 cells-1) than in nitrogen-sufficient conditions (>5 mM KNO3). The lutein content under nitrogen-deficient conditions (1.73 ± 0.09 μg 106 cells-1) was more than 24% higher than that under nitrogen-sufficient conditions. Under the optimized culture condition for carotenoid induction using natural seawater, D. salina OH214 strain produced 7.97 ± 0.09 mg g DCW-1 of β-carotene and 4.65 ± 0.18 mg g DCW-1 of lutein, respectively. We propose that this new microalga is a promising strain for the simultaneous production of β-carotene and lutein.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42835247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Quantification of the ichthyotoxic raphidophyte Chattonella marina complex by applying a droplet digital PCR 应用微滴数字PCR定量鱼毒性沙通菌码头复合体

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.11.30

Juhee Min, Kwang Young Kim

{"title":"Quantification of the ichthyotoxic raphidophyte Chattonella marina complex by applying a droplet digital PCR","authors":"Juhee Min, Kwang Young Kim","doi":"10.4490/algae.2022.37.11.30","DOIUrl":"https://doi.org/10.4490/algae.2022.37.11.30","url":null,"abstract":"Quantifying the abundance of Chattonella species is necessary to effectively manage the threats from ichthyotoxic raphidophytes, which can cause large-scale mortality of aquacultured fish in temperate waters. The identification and cell counting of Chattonella species have been conducted primarily on living cells without fixation by light microscopy because routine fixatives do not retain their morphological features. Species belonging to the Chattonella marina complex, including C. marina and C. marina var. ovata, had high genetic similarities and the lack of clear morphological delimitations between the species. To estimate the abundance of C. marina complex in marine plankton samples, we developed a protocol based on the droplet digital polymerase chain reaction (ddPCR) assay, with C. marina complex-specific primers targeting the internal transcribed spacer (ITS) region of the rDNA. Cell abundance of the C. marina complex can be determined using the ITS copy number per cell, ranging from 25 ± 1 for C. marina to 112 ± 7 for C. marina var. ovata. There were no significant differences in ITS copies estimated by the ddPCR assay between environmental DNA samples from various localities spiked with the same number of cells of culture strains. This approach can be employed to improve the monitoring efficiency of various marine protists and to support the implementation of management for harmful algal blooms, which are difficult to analyze using microscopy alone.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48536928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Unveiling mesophotic diversity in Hawai‘i: two new species in the genera Halopeltis and Leptofauchea (Rhodymeniales, Rhodophyta) 揭示夏威夷中水母的多样性:Halopeltis属和Leptofauchea属的两个新种(Rhodymeniales, rhodophyia)

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.10.31

Erika A. Alvarado, Feresa P. Cabrera, M. O. Paiano, James T. Fumo, Heather L. Spalding, Celiam . Smith, Jason Leonard, Keolohilani H. Lopes Jr., R. Kosaki, A. Sherwood

{"title":"Unveiling mesophotic diversity in Hawai‘i: two new species in the genera Halopeltis and Leptofauchea (Rhodymeniales, Rhodophyta)","authors":"Erika A. Alvarado, Feresa P. Cabrera, M. O. Paiano, James T. Fumo, Heather L. Spalding, Celiam . Smith, Jason Leonard, Keolohilani H. Lopes Jr., R. Kosaki, A. Sherwood","doi":"10.4490/algae.2022.37.10.31","DOIUrl":"https://doi.org/10.4490/algae.2022.37.10.31","url":null,"abstract":"Two genera of the Rhodymeniales, Halopeltis and Leptofauchea, are here reported for the first time from the Hawaiian Islands and represent the deepest records for both genera. Molecular phylogenetic analyses of cytochrome oxidase subunit I (COI), rbcL, and large subunit ribosomal DNA (LSU) sequences for Hawaiian specimens of Leptofauchea revealed one well-supported clade of Hawaiian specimens and three additional lineages. One of these clades is described here as Leptofauchea huawelau sp. nov., and is thus far known only from mesophotic depths at Penguin Bank in the Main Hawaiian Islands. L. huawelau sp. nov. is up to 21 cm, and is the largest known species. An additional lineage identified in the LSU and rbcL analyses corresponds to the recently described L. lucida from Western Australia, and is a new record for Hawai‘i. Hawaiian Halopeltis formed a well-supported clade along with H. adnata from Korea, the recently described H. tanakae from mesophotic depths in Japan, and H. willisii from North Carolina, and is here described as Halopeltis nuahilihilia sp. nov. H. nuahilihilia sp. nov. has a distinctive morphology of narrow vegetative axes that harbor constrictions along their length. The current distribution of H. nuahilihilia includes mesophotic depths around W. Maui, W. Moloka‘i, and the island of Hawai‘i in the Main Hawaiian Islands. Few reproductive characters were observed because of the small number of specimens available; however, both species are distinct based on phylogeny and morphology. These descriptions further emphasize the Hawaiian mesophotic zone as a location harboring many undescribed species of marine macroalgae.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44645330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

ERRATUM: Author’s Name Correction: Splitting blades: why genera need to be more carefully defined; the case for Pyropia (Bangiales, Rhodophyta) 勘误:作者姓名更正:分裂叶片:为什么属需要更仔细地定义;焦皮炎的案例(红水螅属)

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.12.7

引用次数: 4

Effect of substratum types on the growth of assimilators and stolons of Caulerpa okamurae (Bryopsidales, Chlorophyta) 不同基质类型对冈野茎叶同化物和匍匐茎生长的影响

IF 3.2 3区生物学

Algae Pub Date : 2022-12-15 DOI: 10.4490/algae.2022.37.12.10

S. Park, J. Kim, H. Choi

{"title":"Effect of substratum types on the growth of assimilators and stolons of Caulerpa okamurae (Bryopsidales, Chlorophyta)","authors":"S. Park, J. Kim, H. Choi","doi":"10.4490/algae.2022.37.12.10","DOIUrl":"https://doi.org/10.4490/algae.2022.37.12.10","url":null,"abstract":"To examine the effects of substratum types on the growth of Caulerpa okamurae, sand surface and sand burial experiments were conducted. Five assimilators (erect fronds) per replicate were cultured for 15 d on the surface of three different treatments: fine sand (200 μm), coarse sand (600 μm), and no sand (control). Also, three stolons and three assimilators were buried by fine grain or coarse grain sands and incubated for 15 d. In both experiments, other culture conditions included 25°C, 30 μmol photons m-2 s-1, and 16 : 8 h L : D (light : dark). In both experiments, stolon + assimilator-, assimilator-, and stolon-weights were measured. Relative growth rates (RGRs) of stolon + assimilator weights ranged from 0.43 to 1.95% d-1 at no sand and fine sand treatment, respectively. RGRs for the weight of stolon + assimilator and new assimilators were significantly greater on the fine- and coarse sand surface than the control. In the burial experiments, RGRs of stolons (4.28% d-1 at coarse sand and 5.57% d-1 at fine sand, respectively) were significantly greater than those of assimilators (1.38% d-1 at fine sand and 1.82% d-1 at coarse sand, respectively). When stolons were buried, RGRs for assimilators were greater at the fine sand than at the coarse sand treatment. On the other hand, RGRs of buried assimilators for total frond weights and for newly produced stolons were significantly greater at the coarse sands than at the fine sands. In conclusion, C. okamurae grew well with all substrates of sands and showed better growth on fine sands than coarse ones. This result suggests that the growth of stolons and assimilators of C. okamurae is stimulated after stable attachment to the sand substrates by rhizophores. In addition, stolons showed higher growth rates than the assimilators in the sand burial states, indicating that stolons are more tolerant to low light than assimilators of C. okamurae.","PeriodicalId":7628,"journal":{"name":"Algae","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43071463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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