1
|
Kuwata K, Lum WM, Takahashi K, Benico G, Takahashi K, Lim PT, Leaw CP, Uchida H, Ozawa M, Matsushima R, Watanabe R, Suzuki T, Iwataki M. Phylogeny and ultrastructure of a non-toxigenic dinoflagellate Amphidoma fulgens sp. nov. (Amphidomataceae, Dinophyceae), with a wide distribution across Asian Pacific. HARMFUL ALGAE 2024; 138:102701. [PMID: 39244236 DOI: 10.1016/j.hal.2024.102701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 06/20/2024] [Accepted: 07/24/2024] [Indexed: 09/09/2024]
Abstract
Amphidoma languida, a marine thecate dinoflagellate that produces the lipophilic toxin azaspiracids (AZAs), is primarily found in the Atlantic. Although this species has not been recorded in the Asian Pacific, environmental DNAs related to Am. languida have been widely detected in the region by metabarcoding analysis. Their morphology and AZA production remain unclear. In this study, the morphology, ultrastructure, phylogeny, and AZA production of nine Amphidoma strains isolated from Japan, Malaysia, and Philippines were investigated. Phylogenetic trees inferred from rDNAs (SSU, ITS, and LSU rDNA) showed monophyly of the nine Pacific strains and were sister to the Am. languida clade, including the toxigenic strains from the Atlantic. Cells were ellipsoid, 8.7-16.7 µm in length and 7.4-14.0 µm in width, with a conspicuous apical pore complex. A large nucleus in the hyposome, parietal chloroplast with a spherical pyrenoid in the episome, and refractile bodies were observed. Thecal tabulation was typical of Amphidoma, Po, cp, X, 6', 6'', 6C, 5S, 6''', 2''''. A ventral pore was located on the anterior of 1' plate, beside the suture to 6' plate. The presence of a ventral depression, on the anterior of anterior sulcal plate, was different from Am. languida. A large antapical pore, containing approximately 10 small pores, was observed. Cells were apparently smaller than Am. trioculata, a species possessing three pores (ventral pore, ventral depression, and antapical pore). TEM showed the presence of crystalline structures, resembling guanine crystals, and cytoplasmic invaginations into the pyrenoid matrix. Flagellar apparatus lacking the striated root connective is similar to peridinioids and related dinoflagellates. AZAs were not detected from the Pacific strains by LC-MS/MS. This non-toxigenic Amphidoma species, here we propose as Amphidoma fulgens sp. nov., is widely distributed in the Asian Pacific. Moreover, molecular comparison also suggested that most of the environmental DNA sequences previously reported as Am. languida or related sequences from the Asian Pacific were attributable to Am. fulgens.
Collapse
Affiliation(s)
- Koyo Kuwata
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Wai Mun Lum
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan; Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Kazuya Takahashi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Garry Benico
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan; Department of Biological Sciences, College of Science, Central Luzon State University, Science City of Muñoz, Nueva Ecija, 3120, Philippines
| | - Kazutaka Takahashi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310, Bachok, Kelantan, Malaysia
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310, Bachok, Kelantan, Malaysia
| | - Hajime Uchida
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Mayu Ozawa
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Ryoji Matsushima
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Ryuichi Watanabe
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Toshiyuki Suzuki
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan
| | - Mitsunori Iwataki
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan.
| |
Collapse
|
2
|
Cembella A, Klemm K, John U, Karlson B, Arneborg L, Clarke D, Yamanaka T, Cusack C, Naustvoll L, Bresnan E, Šupraha L, Lundholm N. Emerging phylogeographic perspective on the toxigenic diatom genus Pseudo-nitzschia in coastal northern European waters and gateways to eastern Arctic seas: Causes, ecological consequences and socio-economic impacts. HARMFUL ALGAE 2023; 129:102496. [PMID: 37951606 DOI: 10.1016/j.hal.2023.102496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 08/29/2023] [Accepted: 08/31/2023] [Indexed: 11/14/2023]
Abstract
The diatom Pseudo-nitzschia H. Peragallo is perhaps the most intensively researched genus of marine pennate diatoms, with respect to species diversity, life history strategies, toxigenicity, and biogeographical distribution. The global magnitude and consequences of harmful algal blooms (HABs) of Pseudo-nitzschia are particularly significant because of the high socioeconomic impacts and environmental and human health risks associated with the production of the neurotoxin domoic acid (DA) among populations of many (although not all) species. This has led to enhanced monitoring and mitigation strategies for toxigenic Pseudo-nitzschia blooms and their toxins in recent years. Nevertheless, human adaptive actions based on future scenarios of bloom dynamics and proposed shifts in biogeographical distribution under climate-change regimes have not been implemented on a regional scale. In the CoCliME (Co-development of climate services for adaptation to changing marine ecosystems) program these issues were addressed with respect to past, current and anticipated future status of key HAB genera such as Pseudo-nitzschia and expected benefits of enhanced monitoring. Data on the distribution and frequency of Pseudo-nitzschia blooms in relation to DA occurrence and associated amnesic shellfish toxin (AST) events were evaluated in a contemporary and historical context over the past several decades from key northern CoCliME Case Study areas. The regional studies comprised the greater North Sea and adjacent Kattegat-Skagerrak and Norwegian Sea, eastern North Atlantic marginal seas and Arctic gateways, and the Baltic Sea. The first evidence of possible biogeographical expansion of Pseudo-nitzschia taxa into frontier eastern Arctic gateways was provided from DNA barcoding signatures. Key climate change indicators, such as salinity, temperature, and water-column stratification were identified as drivers of upwelling and advection related to the distribution of regional Pseudo-nitzschia blooms. The possible influence of changing variables on bloom dynamics, magnitude, frequency and spatial and temporal distribution were interpreted in the context of regional ocean climate models. These climate change indicators may play key roles in selecting for the occurrence and diversity of Pseudo-nitzschia species within the broader microeukaryote communities. Shifts to higher temperature and lower salinity regimes predicted for the southern North Sea indicate the potential for high-magnitude Pseudo-nitzschia blooms, currently absent from this area. Ecological and socioeconomic impacts of Pseudo-nitzschia blooms are evaluated with reference to effects on fisheries and mariculture resources and coastal ecosystem function. Where feasible, effective adaptation strategies are proposed herein as emerging climate services for the northern CoCLiME region.
Collapse
Affiliation(s)
- Allan Cembella
- Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Am Handelshafen 12, Bremerhaven 27570, Germany; Departamento de Biotecnología Marina, Centro de Investigación Científica y Educación Superior de Ensenada, Carr. Tijuana-Ensenada 3918, Zona Playitas, Ensenada, Baja California 22860, Mexico
| | - Kerstin Klemm
- Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Am Handelshafen 12, Bremerhaven 27570, Germany; Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Ammerländer Heerstraße 231, Oldenburg 26129, Germany
| | - Uwe John
- Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Am Handelshafen 12, Bremerhaven 27570, Germany; Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Ammerländer Heerstraße 231, Oldenburg 26129, Germany.
| | - Bengt Karlson
- Research and Development, Oceanography, Swedish Meteorological and Hydrological Institute, Sven Källfelts gata 15, Västra SE-426 71, Frölunda, Sweden
| | - Lars Arneborg
- Research and Development, Oceanography, Swedish Meteorological and Hydrological Institute, Sven Källfelts gata 15, Västra SE-426 71, Frölunda, Sweden
| | - Dave Clarke
- Marine Institute, Rinville, Oranmore, Co. Galway H91 R673, Ireland
| | - Tsuyuko Yamanaka
- Marine Institute, Rinville, Oranmore, Co. Galway H91 R673, Ireland
| | - Caroline Cusack
- Marine Institute, Rinville, Oranmore, Co. Galway H91 R673, Ireland
| | - Lars Naustvoll
- Institute of Marine Research, PO Box 1870 Nordnes, Bergen NO-5817, Norway
| | - Eileen Bresnan
- Marine Directorate of the Scottish Government, Science, Evidence, Digital and Data, 375 Victoria Rd, Aberdeen AB11 9DB, UK
| | - Luka Šupraha
- Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, P.O. Box 1066 Blindern, Oslo 0316, Norway
| | - Nina Lundholm
- Natural History Museum of Denmark, University of Copenhagen, Øster Farimagsgade 5, Copenhagen K 1353, Denmark
| |
Collapse
|
3
|
Abdul Manaff AHN, Hii KS, Luo Z, Liu M, Law IK, Teng ST, Akhir MF, Gu H, Leaw CP, Lim PT. Mapping harmful microalgal species by eDNA monitoring: A large-scale survey across the southwestern South China Sea. HARMFUL ALGAE 2023; 129:102515. [PMID: 37951609 DOI: 10.1016/j.hal.2023.102515] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 09/02/2023] [Accepted: 09/23/2023] [Indexed: 11/14/2023]
Abstract
A large-scale sampling was undertaken during a research cruise across the South China Sea in August 2016, covering an area of about 100,000 km2 to investigate the molecular diversity and distributions of micro-eukaryotic protists, with a focus on the potentially harmful microalgal (HAB) species along the east coast of Peninsular Malaysia. Environmental DNAs from 30 stations were extracted and DNA metabarcoding targeting the V4 and V9 markers in the 18S rDNA was performed. Many protistan molecular units, including previously unreported HAB taxa, were discovered for the first time in the water. Our findings also revealed interesting spatial distribution patterns, with a marked signal of compositional turnover between latitudinal regimes of water masses, where dinophytes and diatom compositions were among the most strongly enhanced at the fronts, leading to distinct niches. Our results further confirmed the widespread distribution of HAB species, such as the toxigenic Alexandrium tamiyavaichii and Pseudo-nitzschia species, and the fish-killing Margalefidinium polykrikoides and Karlodinium veneficum. The molecular information obtained from this study provides an updated HAB species inventory and a toolset that could facilitate existing HAB monitoring schemes in the region to better inform management decisions.
Collapse
Affiliation(s)
| | - Kieng Soon Hii
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, Bachok, Kelantan, Malaysia
| | - Zhaohe Luo
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Minlu Liu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Ing Kuo Law
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, Bachok, Kelantan, Malaysia
| | - Sing Tung Teng
- Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
| | - Mohd Fadzil Akhir
- Institute of Oceanography and Environment, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, Bachok, Kelantan, Malaysia.
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, Bachok, Kelantan, Malaysia.
| |
Collapse
|
4
|
Watanabe T, Hirai J, Sildever S, Tadokoro K, Hidaka K, Tanita I, Nishiuchi K, Iguchi N, Kasai H, Nishi N, Katakura S, Taniuchi Y, Kodama T, Tashiro S, Nakae M, Okazaki Y, Kitajima S, Sogawa S, Hasegawa T, Azumaya T, Hiroe Y, Ambe D, Setou T, Ito D, Kusaka A, Okunishi T, Tanaka T, Kuwata A, Hasegawa D, Kakehi S, Shimizu Y, Nagai S. Improving taxonomic classification of marine zooplankton by molecular approach: registration of taxonomically verified 18S and 28S rRNA gene sequences. PeerJ 2023; 11:e15427. [PMID: 37334134 PMCID: PMC10276563 DOI: 10.7717/peerj.15427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 04/25/2023] [Indexed: 06/20/2023] Open
Abstract
Background Zooplankton plays an important role in the marine ecosystem. A high level of taxonomic expertise is necessary for accurate species identification based on morphological characteristics. As an alternative method to morphological classification, we focused on a molecular approach using 18S and 28S ribosomal RNA (rRNA) gene sequences. This study investigates how the accuracy of species identification by metabarcoding improves when taxonomically verified sequences of dominant zooplankton species are added to the public database. The improvement was tested by using natural zooplankton samples. Methods rRNA gene sequences were obtained from dominant zooplankton species from six sea areas around Japan and registered in the public database for improving the accuracy of taxonomic classifications. Two reference databases with and without newly registered sequences were created. Comparison of detected OTUs associated with single species between the two references was done using field-collected zooplankton samples from the Sea of Okhotsk for metabarcoding analysis to verify whether or not the newly registered sequences improved the accuracy of taxonomic classifications. Results A total of 166 sequences in 96 species based on the 18S marker and 165 sequences in 95 species based on the 28S marker belonging to Arthropoda (mostly Copepoda) and Chaetognatha were registered in the public database. The newly registered sequences were mainly composed of small non-calanoid copepods, such as species belonging to Oithona and Oncaea. Based on the metabarcoding analysis of field samples, a total of 18 out of 92 OTUs were identified at the species level based on newly registered sequences in the data obtained by the 18S marker. Based on the 28S marker, 42 out of 89 OTUs were classified at the species level based on taxonomically verified sequences. Thanks to the newly registered sequences, the number of OTUs associated with a single species based on the 18S marker increased by 16% in total and by 10% per sample. Based on the 28S marker, the number of OTUs associated with a single species increased by 39% in total and by 15% per sample. The improved accuracy of species identification was confirmed by comparing different sequences obtained from the same species. The newly registered sequences had higher similarity values (mean >0.003) than the pre-existing sequences based on both rRNA genes. These OTUs were identified at the species level based on sequences not only present in the Sea of Okhotsk but also in other areas. Discussion The results of the registration of new taxonomically verified sequences and the subsequent comparison of databases based on metabarcoding data of natural zooplankton samples clearly showed an increase in accuracy in species identification. Continuous registration of sequence data covering various environmental conditions is necessary for further improvement of metabarcoding analysis of zooplankton for monitoring marine ecosystems.
Collapse
Affiliation(s)
- Tsuyoshi Watanabe
- Kushiro Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Japan
| | - Junya Hirai
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Sirje Sildever
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
- Department of Marine Systems, Tallinn University of Technology, Tallinn, Estonia
| | - Kazuaki Tadokoro
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Kiyotaka Hidaka
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Iwao Tanita
- Yaeyama Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Ishigaki, Japan
| | - Koh Nishiuchi
- Nagasaki Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan
| | - Naoki Iguchi
- Niigata Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Niigata, Japan
| | - Hiromi Kasai
- Kushiro Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Japan
| | | | | | - Yukiko Taniuchi
- Kushiro Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Japan
| | - Taketoshi Kodama
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
- Present Address: Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan
| | - Satokuni Tashiro
- Yaeyama Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Ishigaki, Japan
| | - Misato Nakae
- Niigata Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Niigata, Japan
| | - Yuji Okazaki
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Satoshi Kitajima
- Nagasaki Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan
| | - Sayaka Sogawa
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Toru Hasegawa
- Nagasaki Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan
| | - Tomonori Azumaya
- Kushiro Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Japan
| | - Yutaka Hiroe
- Nagasaki Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan
| | - Daisuke Ambe
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Takashi Setou
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Daiki Ito
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Akira Kusaka
- Yokohama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Takeshi Okunishi
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Takahiro Tanaka
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Akira Kuwata
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Daisuke Hasegawa
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Shigeho Kakehi
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Yugo Shimizu
- Shiogama Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Shiogama, Japan
| | - Satoshi Nagai
- Yokohama Field Station, Fisheries Technology Institute, Fisheries Research and Education Agency, Yokohama, Japan
| |
Collapse
|
5
|
Liu M, Tillmann U, Ding G, Wang A, Gu H. Metabarcoding revealed a high diversity of Amphidomataceae (Dinophyceae) and the seasonal distribution of their toxigenic species in the Taiwan Strait. HARMFUL ALGAE 2023; 124:102404. [PMID: 37164557 DOI: 10.1016/j.hal.2023.102404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 02/03/2023] [Accepted: 02/07/2023] [Indexed: 05/12/2023]
Abstract
The dinophyte family Amphidomataceae includes the genera Azadinium and Amphidoma. Four of these species are known to produce azaspiracids, which are lipophilic phycotoxins accumulating in shellfish. The diversity and biogeography of Amphidomataceae is far from yet resolved. Here we performed a time series sampling of both water and sediments in the Taiwan Strait from Nov. 2018 to April 2021. Metabarcoding was performed to unveil the diversity of Amphidomataceae targeting internal transcribed spacer (ITS1) region and partial large subunit ribosomal DNA (LSU rDNA D1-D3), followed by quantitative PCR (qPCR) with modified primers for Az. poporum ribotypes. The diversity of Amphidomataceae was revealed from the water samples with the aid of ITS1 and LSU based molecular phylogeny. The LSU based approach detected only a few species. In contrast, ITS1 based dataset showed eight new Azadinium clades and several ZOTUs (zero-radius operational taxonomic units) grouping together with Am. languida. Moreover, eleven known Azadinium species including three ribotypes of Az. poporum and Az. dexteroporum, and two ribotypes of Az. spinosum, were detected. The latter two species have not been reported in China before. Among these toxigenic species, Az. poporum was relevantly abundant whereas others were rare. The maximum of 209 cells L -1 of Az. poporum ribotype A was estimated using qPCR nearby Quanzhou in Nov. 2018 and 172 cells L 1 of Az. poporum ribotype B was detected far off coast in Apr. 2021. Metabarcoding on sediment samples revealed Az. poporum ribotypes B and C, but strains obtained with sediment incubation experiments yielded only ribotype B. Using qPCR about 0.2 cysts g -1 of Az. poporum ribotype B were quantified in May 2019 but cysts of Az. poporum ribotype C were not detected. Our results suggest that metabarcoding targeting ITS1 region is powerful to uncover the diversity of harmful dinophytes. Our results also highlight the rich diversity of Amphidomataceae and risk potential of azaspiracids in the Taiwan Strait and surrounding waters.
Collapse
Affiliation(s)
- Minlu Liu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, PR. China
| | - Urban Tillmann
- Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany
| | - Guangmao Ding
- Fishery Resources Monitoring Center of Fujian Province, Fuzhou 350003, PR. China
| | - Aijun Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, PR. China; Fujian Provincial Key Laboratory of Marine Physical and Geological Processes, Xiamen 361005, PR. China
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, PR. China; Key Laboratory of Marine Ecological Conservation and Restoration, Ministry of Natural Resources, Xiamen 361005, PR. China; Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration, Xiamen 361005, PR. China.
| |
Collapse
|
6
|
Agarwal V, Chávez-Casillas J, Mouw CB. Sub-monthly prediction of harmful algal blooms based on automated cell imaging. HARMFUL ALGAE 2023; 122:102386. [PMID: 36754456 DOI: 10.1016/j.hal.2023.102386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/04/2023] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Harmful algal blooms (HABs) are an increasing threat to global fisheries and human health. The mitigation of HABs requires management strategies to successfully forecast the abundance and distribution of harmful algal taxa. In this study, we attempt to characterize the dynamics of 2 phytoplankton genera (Pseudo-nitzschia spp. and Dinophysis spp.) in Narragansett Bay, Rhode Island, using empirical dynamic modeling. We utilize a high-resolution Imaging FlowCytobot dataset to generate a daily-resolution time series of phytoplankton images and then characterize the sub-monthly (1-30 days) timescales of univariate and multivariate prediction skill for each taxon. Our results suggest that univariate predictability is low overall, different for each taxon and does not significantly vary over sub-monthly timescales. For all univariate predictions, models can rely on the inherent autocorrelation within each time series. When we incorporated multivariate data based on quantifiable image features, we found that predictability increased for both taxa and that this increase was apparent on timescales >7 days. Pseudo-nitzschia spp. has distinctive predictive dynamics that occur on timescales of around 16 and 25 days. Similarly, Dinophysis spp. is most predictable on timescales of 25 days. The timescales of prediction for Pseudo-nitzschia spp. and Dinophysis spp. could be tied to environmental drivers such as tidal cycles, water temperature, wind speed, community biomass, salinity, and pH in Narragansett Bay. For most drivers, there were consistent effects between the environmental variables and the phytoplankton taxon. Our analysis displays the potential of utilizing data from automated cell imagers to forecast and monitor harmful algal blooms.
Collapse
Affiliation(s)
- Vitul Agarwal
- Graduate School of Oceanography, University of Rhode Island, Narragansett, United States of America.
| | - Jonathan Chávez-Casillas
- Department of Mathematics and Applied Mathematical Sciences, University of Rhode Island, Kingston, United States of America
| | - Colleen B Mouw
- Graduate School of Oceanography, University of Rhode Island, Narragansett, United States of America
| |
Collapse
|
7
|
Wu HY, Dong CF, Zheng GC, Zhang ZH, Zhang YY, Tan ZJ, Gu HF. Formation mechanism and environmental drivers of Alexandrium catenella bloom events in the coastal waters of Qinhuangdao, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 313:120241. [PMID: 36152713 DOI: 10.1016/j.envpol.2022.120241] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/21/2022] [Accepted: 09/18/2022] [Indexed: 06/16/2023]
Abstract
In the last 5 years, paralytic shellfish toxins (PSTs) have been recurrently detected in mollusks farmed in the mussel culture area of Qinhuangdao city, along with the occurrence of toxic outbreaks linked to dinoflagellate species of the Alexandrium genus. To understand the formation mechanism and variation of these events, continuous and comprehensive PSTs monitoring was carried out between 2017 and 2020. Through the analysis of both phytoplankton and cysts via light microscopy and quantitative polymerase chain reaction, it was shown that Alexandrium catenella was responsible for the production of PSTs, which consisted mainly of gonyautoxins 1,4 (GTX1/4, 87%) and GTX2/3 (13%). During bloom events in 2019, mussels accumulated the highest PSTs value (929 μg STX di-HCl eq·kg-1) in conjunction with the peak of cell abundances, and toxin profiles were consistent with high distributions of GTX1/4, GTX2/3, and Neosaxitoxin. Toxin metabolites vary in different substances and mainly transferred to a stable proportion of α-epimer: β-epimers 3:1. The environmental drivers of Alexandrium blooms included the continuous rise of water temperature (>4 °C) and calm weather with low wind speed and no significant precipitation. By comparing toxin profiles and method sensitivity, it was found that dissolved toxins in seawater are more useful for early warning. These results have important implications for the effective monitoring and management of paralytic shellfish poisoning outbreaks.
Collapse
Affiliation(s)
- Hai-Yan Wu
- Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Chen-Fan Dong
- Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China; College of Food Science and Technology, Shanghai Ocean University, Shanghai, 201306, China
| | - Guan-Chao Zheng
- Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Zhi-Hua Zhang
- Hebei Province Aquatic Products Quality Inspection and Testing Station, Shijiazhuang, 050011, China
| | - Ya-Ya Zhang
- Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Zhi-Jun Tan
- Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China
| | - Hai-Feng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| |
Collapse
|
8
|
Fan G, Li X, Lin J, Wu X, Zhang L, Wu J, Wang Y. Efficient photocatalytic inactivation of Microcystis aeruginosa via self-floating Ag3VO4/BiVO4 hydrogel under visible light. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121803] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
9
|
Sildever S, Nishi N, Inaba N, Asakura T, Kikuchi J, Asano Y, Kobayashi T, Gojobori T, Nagai S. Monitoring harmful microalgal species and their appearance in Tokyo Bay, Japan, using metabarcoding. METABARCODING AND METAGENOMICS 2022. [DOI: 10.3897/mbmg.6.79471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
During the recent decade, high-throughput sequencing (HTS) techniques, in particular, DNA metabarcoding, have facilitated increased detection of biodiversity, including harmful algal bloom (HAB) species. In this study, the presence of HAB species and their appearance patterns were investigated by employing molecular and light microscopy-based monitoring in Tokyo Bay, Japan. The potential co-appearance patterns between the HAB species, as well as with other eukaryotes and prokaryotes were investigated using correlation and association rule-based time-series analysis. In total, 40 unique HAB species were detected, including 12 toxin-producing HAB species previously not reported from the area. More than half of the HAB species were present throughout the sampling season (summer to autumn) and no structuring or succession patterns associated with the environmental conditions could be detected. Statistically significant (p < 0.05, rS ranging from −0.88 to 0.90) associations were found amongst the HAB species and other eukaryotic and prokaryotic species, including genera containing growth-limiting bacteria. However, significant correlations between species differed amongst the years, indicating that variability in environmental conditions between the years may have a stronger influence on the microalgal community structure and interspecies interactions than the variability during the sampling season. The association rule-based time-series analysis allowed the detection of a previously reported negative relationship between Synechococcus sp. and Skeletonema sp. in nature. Overall, the results support the applicability of metabarcoding and HTS-based microalgae monitoring, as it facilitates more precise species identification compared to light microscopy, as well as provides input for investigating potential interactions amongst different species/groups through simultaneous detection of multiple species/genera.
Collapse
|
10
|
Xu S, Lyu P, Zheng X, Yang H, Xia B, Li H, Zhang H, Ma S. Monitoring and control methods of harmful algal blooms in Chinese freshwater system: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:56908-56927. [PMID: 35708805 DOI: 10.1007/s11356-022-21382-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 06/06/2022] [Indexed: 06/15/2023]
Abstract
Harmful algal blooms (HABs) are a worldwide problem with substantial adverse effects on the aquatic environment as well as human health, which have prompted researchers to study measures to stem and control them. Meanwhile, it is key to research and develop monitoring methods to establish early warning HABs. However, both the current monitoring methods and control methods have some shortcomings, making the field application limited. Thus, we need to improve current approaches for monitoring and controlling HABs efficiently. Based on the freshwater system features in China, we review various monitoring and control methods of HABs, summarize and discuss the problems with these methods, and propose the future development direction of monitoring and control HABs. Finally, we envision that it can combine physical, chemical, and biological methods to inhibit HAB expansion in the future, complementing each other with advantages. Further, we promise to establish a long-term strategy of controlling HABs with various algicidal bacteria co-cultivate for field applications in China. Efforts in studying algicidal bacteria must be increased to better control HABs and mitigate the risks of aquatic ecosystems and human health in China.
Collapse
Affiliation(s)
- Shengjun Xu
- Shenzhen BLY Landscape & Architecture Planning & Design Institute, Shenzhen, 518055, China
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Ping Lyu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Xiaoxu Zheng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Haijun Yang
- Shenzhen BLY Landscape & Architecture Planning & Design Institute, Shenzhen, 518055, China
| | - Bing Xia
- Shenzhen BLY Landscape & Architecture Planning & Design Institute, Shenzhen, 518055, China
| | - Hui Li
- Shenzhen BLY Landscape & Architecture Planning & Design Institute, Shenzhen, 518055, China
| | - Hao Zhang
- South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
| | - Shuanglong Ma
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China.
| |
Collapse
|
11
|
Liu M, Krock B, Yu R, Leaw CP, Lim PT, Ding G, Wang N, Zheng J, Gu H. Co-occurrence of Alexandrium minutum (Dinophyceae) ribotypes from the Chinese and Malaysian coastal waters and their toxin production. HARMFUL ALGAE 2022; 115:102238. [PMID: 35623696 DOI: 10.1016/j.hal.2022.102238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 04/03/2022] [Accepted: 04/14/2022] [Indexed: 06/15/2023]
Abstract
The bloom-forming dinophyte Alexandrium minutum comprises biogeographic inferred, global and Pacific clades with both toxic and nontoxic strains reported. A. minutum has a wide distribution in the Western Pacific, but to date only a few strains have available DNA sequences. To fully understand its genetic diversity, sampling was undertaken from the Yellow Sea, the East and South China Sea, and five strains of A. minutum and two strains of its sister species, A. tamutum, were established. Their morphology was examined by light and scanning electron microscopy. In addition, sequences were obtained from both large subunit (LSU) ribosomal DNA and/or internal transcribed spacer (ITS) region. Strains of A. minutum are morphologically indistinguishable, characterized by a smaller cell size and a narrow sixth precingular plate. In contrast, A. tamutum has a wider sixth precingular plate. High nucleotide divergences of LSU (D1-D3) rDNA and ITS were revealed amongst strains of A. minutum (10% and 25%, respectively), and A. tamutum (3% and 13%, respectively). Molecular phylogenies based on LSU rDNA and ITS revealed three ribotypes (B-D) of A. minutum, and two ribotypes of A. tamutum in the Western Pacific. Seasonal sampling in the East China Sea to detect A. minutum using the DNA metabarcoding targeting ITS1 region was also performed. Our results showed that the ribotypes B and C of A. minutum co-occurred in the water. Paralytic shellfish toxin (PSTs) of all seven strains was analysed using liquid chromatography with tandem mass spectrometry (LC-MS/MS). PSTs were detected only in A. minutum ribotypes B and C with predominance of gonyautoxins 1/4. Our results suggest high diversity and risk potential of this toxic species in this region.
Collapse
Affiliation(s)
- Minlu Liu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Bernd Krock
- Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, D-27570 Germany
| | - Rencheng Yu
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Guangmao Ding
- Fishery Resources Monitoring Center of Fujian Province, Fuzhou 350003, China
| | - Na Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Jing Zheng
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; Key Laboratory of Marine Ecological Conservation and Restoration, Ministry of Natural Resources, Xiamen 361005, China; Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration, Xiamen 361005, China.
| |
Collapse
|
12
|
Oxidative stress of Microcystis aeruginosa induced by algicidal bacterium Stenotrophomonas sp. KT48. Appl Microbiol Biotechnol 2022; 106:4329-4340. [PMID: 35604440 DOI: 10.1007/s00253-022-11959-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/02/2022] [Accepted: 05/04/2022] [Indexed: 11/02/2022]
Abstract
Cyanobacterial harmful algal blooms are a worldwide problem with substantial adverse effects on the aquatic environment as well as human health. Among the multiple physicochemical and biotic approaches, algicidal bacterium is one of the most promising and eco-friendly ways to control bloom expansion. In this study, Stenotrophomonas sp. KT48 isolated from the pond where cyanobacterial blooms occurred exhibited a strong inhibitory effect on Microcystis aeruginosa. However, the algicidal performance and mechanisms of Stenotrophomonas sp. remain under-documented. To explore the algicidal performance and physiological response againt M. aeruginosa, further works were implemented here. Our results indicated that the algicidal rate of strain KT48 cultured in 1/8 LB medium supplemented with 0.3% starch or glucose was about 30% higher than that in 1/8 LB medium. Strain KT48 culture, cell-free filtrate, and cells re-suspended were inoculated into the M. aeruginosa culture, and the Chl-a content was determined. Those results indicated that the algicidal activity of cells re-suspended was far higher than that of cell-free filtrate and culture. Thus, strain KT48 exhibited algicidal activity mainly through direct attacking M. aeruginosa rather than excretion of algicides. Furthermore, strain KT48 led to an increase in cellular reactive oxygen species (ROS) and caused lipid peroxidation as supported by the increase in malondialdehyde (MDA) levels. The ROS and MDA levels in algal cells treated with strain KT48 cells re-suspended were about 3.23-fold and 2.80-fold higher than those of untreated algal cells on day 11. And a further inhibition to the antioxidant system is suggested by a sharp decrease in the superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) activities. In addition, we also observed that the morphology of most algal cells changed from integrity to break. This study not only indicated strain KT48 with strong algicidal activity, but also explored the underlying algicidal mechanisms to provide a source of bacterial agent for the biocontrol of cyanobacterial blooms. KEY POINTS: • Strain KT48 exhibited strong algicidal activity mainly through direct attacking M. aeruginosa. • The addition of glucose could enhance the algicidal rate of strain KT48 by about 30%. • Strain KT48 led to an increase in cellular reactive oxygen species (ROS) level that causes membrane damage as supported by the increase in malondialdehyde (MDA) levels.
Collapse
|
13
|
Iwataki M, Lum WM, Kuwata K, Takahashi K, Arima D, Kuribayashi T, Kosaka Y, Hasegawa N, Watanabe T, Shikata T, Isada T, Orlova TY, Sakamoto S. Morphological variation and phylogeny of Karenia selliformis (Gymnodiniales, Dinophyceae) in an intensive cold-water algal bloom in eastern Hokkaido, Japan. HARMFUL ALGAE 2022; 114:102204. [PMID: 35550287 DOI: 10.1016/j.hal.2022.102204] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/09/2022] [Accepted: 02/15/2022] [Indexed: 06/15/2023]
Abstract
Harmful algal blooms responsible for mass mortalities of marine organisms have been rare in Hokkaido, northern Japan, although fish-killing blooms have been frequently reported from western Japanese coasts. In September-November 2021, a huge and prolonged cold-water bloom occurred along the Pacific coast of eastern Hokkaido, and was associated with intensive mortalities of sea urchin, fish, octopus, shellfish, etc. In this study, morphology and phylogeny of the dominant and co-occurring unarmored dinoflagellates of the Kareniaceae in the bloom were examined by using light microscopy, scanning electron microscopy and molecular phylogeny inferred from ITS and LSU rDNA (D1-D3) sequences. Morphological observation and molecular phylogeny showed that the dominant species was Karenia selliformis, with co-occurrences of other kareniacean dinoflagellates, Kr. longicanalis, Kr. mikimotoi, Karlodinium sp., Takayama cf. acrotrocha, Takayama tuberculata and Takayama sp. The typical cell forms of Kr. selliformis in the bloom were discoid, dorsoventrally flattened, and 35.3-43.6 (39.4 ± 2.1) µm in length, which was larger than the cell sizes in previous reports. Transparent cells of Kr. selliformis, lacking chloroplasts or having a few shrunken chloroplasts and oil droplets, were also found. Cells of Kr. selliformis showed morphological variation, but the species could be distinguished from other co-occurring Karenia species by the nucleus positioned in the hypocone and chloroplasts numerous (46-105) in number and small (2.9-4.6 µm) in diameter. Cell density of Kr. selliformis exceeding 100 cells mL-1 was recorded in the temperature range of 9.8-17.6 °C. The rDNA sequences determined from Kr. selliformis in the blooms of Hokkaido, Japan in 2021 were identical to those from the bloom in Kamchatka, Russia in 2020.
Collapse
Affiliation(s)
- Mitsunori Iwataki
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
| | - Wai Mun Lum
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Koyo Kuwata
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Kazuya Takahashi
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Daichi Arima
- Central Fisheries Research Institute, Hokkaido Research Organization, Yoichi, Hokkaido 046-8555, Japan
| | - Takanori Kuribayashi
- Central Fisheries Research Institute, Hokkaido Research Organization, Yoichi, Hokkaido 046-8555, Japan
| | - Yuki Kosaka
- Fisheries Research Institute, Aomori Prefectural Industrial Technology Research Center, Hiranai, Aomori 039-3381, Japan
| | - Natsuki Hasegawa
- Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Hokkaido 085-0802, Japan
| | - Tsuyoshi Watanabe
- Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Hokkaido 085-0802, Japan
| | - Tomoyuki Shikata
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Goto, Nagasaki 853-0508, Japan
| | - Tomonori Isada
- Akkeshi Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Akkeshi, Hokkaido 088-1113, Japan
| | - Tatiana Yu Orlova
- National Scientific Center of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok 690041, Russia
| | - Setsuko Sakamoto
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Hatsukaichi, Hiroshima 739-0452, Japan
| |
Collapse
|
14
|
Sogawa S, Tsuchiya K, Nagai S, Shimode S, Kuwahara VS. Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan. METABARCODING AND METAGENOMICS 2022. [DOI: 10.3897/mbmg.6.78181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Sagami Bay, Japan is influenced by both the warm Kuroshio Current and the cold Oyashio Current and rich nutrients are supplied from multiple river sources and the deep-sea, forming a dynamic ecosystem. The aim of the present study was to investigate eukaryotic and bacterial communities in the coastal waters of Sagami Bay, using 16S rRNA and 18S rRNA sequencing and to assess the seasonal and vertical dynamics in relation to physicochemical and biological conditions. Eukaryotic and bacterial communities showed synchronous seasonal and vertical changes along with environmental variability. Diversity of plankton community suspended in the surface was lower than those at the subsurface layers in both the eukaryotes and bacteria communities; however, community diversity showed different characteristics in the subsurface where the eukaryotic community at the deeper layer (100 m) was as low as the surface and highest in intermediate depth layers (10–50 m), while that of bacterial community was highest in the deeper layer (100 m). The annual variability of the coastal microbial communities was driven, not only by the seasonal changes of abiotic and biotic factors and short-term rapid changes by river water inflow and phytoplankton blooms, but also largely influenced by deep-seawater upwellings due to the unique seafloor topography.
Collapse
|
15
|
Nagai S, Sildever S, Nishi N, Tazawa S, Basti L, Kobayashi T, Ishino Y. Comparing PCR-generated artifacts of different polymerases for improved accuracy of DNA metabarcoding. METABARCODING AND METAGENOMICS 2022. [DOI: 10.3897/mbmg.6.77704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Accuracy of PCR amplification is vital for obtaining reliable amplicon-sequencing results by metabarcoding. Here, we performed a comparative analysis of error profiles in the PCR products by 14 different PCR kits using a mock eukaryotic community DNA sample mimicking metabarcoding analysis. To prepare a mock eukaryotic community from the marine environment, equal amounts of plasmid DNA from 40 microalgal species were mixed and used for amplicon-sequencing by a high-throughput sequencing approach. To compare the differences in PCR kits used for this experiment, we focused on the following seven parameters: 1) Quality, 2) Chimera, 3) Blast top hit accuracy, 4) Deletion, 5) Insertion, 6) Base substitution and 7) Amplification bias amongst species. The results showed statistically significant differences (p < 0.05) for all of the seven parameters depending on the PCR kits used. These differences may result from the different DNA polymerases included in each kit, although the result can also be influenced by PCR reaction conditions. Simultaneous analysis of several parameters suggested that kits containing KOD plus Neo (TOYOBO) and HotStart Taq DNA polymerase (BiONEER, CA, US) at the annealing temperature of 65 °C displayed better results in terms of parameters associated with chimeras, top hit similarity and deletions.
Collapse
|
16
|
Sildever S, Laas P, Kolesova N, Lips I, Lips U, Nagai S. Plankton biodiversity and species co-occurrence based on environmental DNA – a multiple marker study. METABARCODING AND METAGENOMICS 2021. [DOI: 10.3897/mbmg.5.72371] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Metabarcoding in combination with high-throughput sequencing (HTS) allows simultaneous detection of multiple taxa by targeting single or several taxonomically informative gene regions from environmental DNA samples. In this study, a multiple-marker HTS approach was applied to investigate the plankton diversity and seasonal succession in the Baltic Sea from winter to autumn. Four different markers targeting the 16S, 18S, and 28S ribosomal RNA genes were employed, including a marker for more efficient dinoflagellate detection. Typical seasonal changes were observed in phyto- and bacterioplankton communities. In phytoplankton, the appearance patterns of selected common, dominant, or harmful species followed the patterns also confirmed based on 20 years of phytoplankton monitoring data. In the case of zooplankton, both macro- and microzooplankton species were detected. However, no seasonal patterns were detected in their appearance. In total, 15 and 2 new zoo- and phytoplankton species were detected from the Baltic Sea. HTS approach was especially useful for detecting microzooplankton species as well as for investigating the co-occurrence and potential interactions of different taxa. The results of this study further exemplify the efficiency of metabarcoding for biodiversity monitoring and the advantage of employing multiple markers through the detection of species not identifiable based on a single marker survey and/or by traditional morphology-based methods.
Collapse
|
17
|
Lum WM, Benico G, Doan-Nhu H, Furio E, Leaw CP, Leong SCY, Lim PT, Lim WA, Lirdwitayaprasit T, Lu S, Nguyen NV, Orlova TY, Rachman A, Sakamoto S, Takahashi K, Teng ST, Thoha H, Wang P, Yñiguez AT, Wakita K, Iwataki M. The harmful raphidophyte Chattonella (Raphidophyceae) in Western Pacific: Its red tides and associated fisheries damage over the past 50 years (1969-2019). HARMFUL ALGAE 2021; 107:102070. [PMID: 34456025 DOI: 10.1016/j.hal.2021.102070] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 06/04/2021] [Accepted: 06/12/2021] [Indexed: 06/13/2023]
Abstract
Red tides and associated fisheries damage caused by the harmful raphidophyte Chattonella were reassessed based on the documented local records for 50 years to understand the distribution and economic impacts of the harmful species in the Western Pacific. Blooms of Chattonella with fisheries damage have been recorded in East Asia since 1969, whereas they have been only recorded in Southeast Asia since the 1980s. Occurrences of Chattonella have been documented from six Southeast Asian countries, Indonesia, Malaysia, Philippines, Singapore, Thailand and Viet Nam, with mass mortalities mainly of farmed shrimp in 1980-1990s, and farmed fish in 2000-2010s. These occurrences have been reported with the names of C. antiqua, C. marina, C. ovata, C. subsalsa and Chattonella sp., owing to the difficulty of microscopic species identification, and many were not supported with molecular data. To determine the distribution of C. marina complex and C. subsalsa in Southeast Asia, molecular phylogeny and microscopic observation were also carried out for cultures obtained from Indonesia, Malaysia, Japan, Philippines, Russia, Singapore and Thailand. The results revealed that only the genotype of C. marina complex has been detected from East Asia (China, Japan, Korea and Russia), whereas both C. marina complex (Indonesia and Malaysia) and C. subsalsa (Philippines, Singapore and Thailand) were found in Southeast Asia. Ejection of mucocysts has been recognized as a diagnostic character of C. subsalsa, but it was also observed in our cultures of C. marina isolated from Indonesia, Malaysia, Japan, and Russia. Meanwhile, the co-occurrences of the two harmful Chattonella species in Southeast Asia, which are difficult to distinguish solely based on their morphology, suggest the importance of molecular identification of Chattonella genotypes for further understanding of their distribution and negative impacts.
Collapse
Affiliation(s)
- Wai Mun Lum
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Garry Benico
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan; Department of Biological Sciences, College of Science, Central Luzon State University, Science City of Munoz, Nueva Ecija, 3120, Philippines
| | - Hai Doan-Nhu
- Institute of Oceanography, Viet Nam Academy of Science and Technology, Nha Trang, Viet Nam
| | - Elsa Furio
- National Fisheries Research and Development Institute, Quezon City, Philippines
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Sandric Chee Yew Leong
- St. John's Island National Marine Laboratory, Tropical Marine Science Institute, National University of Singapore, Singapore
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Weol Ae Lim
- National Institute of Fisheries Science, Busan, Korea
| | | | - Songhui Lu
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China
| | | | - Tatiana Yu Orlova
- National Scientific Center of Marine Biology Far East Branch of the Russian Academy of Sciences, Vladivostok 690041, Russia
| | - Arief Rachman
- Research Center for Oceanography, LIPI, Ancol Timur, Jakarta 14430, Indonesia
| | - Setsuko Sakamoto
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Hatsukaichi, Hiroshima 739-0452, Japan
| | - Kazuya Takahashi
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Sing Tung Teng
- Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
| | - Hikmah Thoha
- Research Center for Oceanography, LIPI, Ancol Timur, Jakarta 14430, Indonesia
| | - Pengbin Wang
- Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China; Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai, China
| | - Aletta T Yñiguez
- The Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
| | - Kazumi Wakita
- School of Marine Science and Technology, Tokai University, Shizuoka 424-8610, Japan
| | - Mitsunori Iwataki
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
| |
Collapse
|
18
|
Hii KS, Mohd-Din M, Luo Z, Tan SN, Lim ZF, Lee LK, Leong SCY, Teng ST, Gu H, Cao X, Lim PT, Leaw CP. Diverse harmful microalgal community assemblages in the Johor Strait and the environmental effects on its community dynamics. HARMFUL ALGAE 2021; 107:102077. [PMID: 34456026 DOI: 10.1016/j.hal.2021.102077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 06/15/2021] [Accepted: 06/27/2021] [Indexed: 06/13/2023]
Abstract
Coastal ecosystems are often subjected to anthropogenic disturbances that lead to water quality deterioration and an increase in harmful algal bloom (HAB) events. Using the next-generation molecular tool of 18S rDNA metabarcoding, we examined the community assemblages of HAB species in the Johor Strait, Malaysia between May 2018 and September 2019, covering 19 stations across the strait. The molecular operational taxonomic units (OTUs) of HAB taxa retrieved from the dataset (n = 194) revealed a much higher number of HAB taxa (26 OTUs) than before, with 12 taxa belong to new records in the strait. As revealed in the findings of this study, the diversity and community structure of HAB taxa varied significantly over time and space. The most common and abundant HAB taxa in the strait (frequency of occurrence >70%) comprised Heterosigma akashiwo, Fibrocapsa japonica, Pseudo-nitzschia pungens, Dinophysis spp., Gymnodinium catenatum, Alexandrium leei, and A. tamiyavanichii. Also, our results demonstrated that the HAB community assemblages in the strait were dependent on the interplay of environmental variables that influence by the monsoonal effects. Different HAB taxa, constitute various functional types, occupied and prevailed in different environmental niches across space and time, leading to diverse community assemblages and population density. This study adds to the current understandings of HAB dynamics and provides a robust overview of temporal-spatial changes in HAB community assemblages along the environmental gradients in a tropical eutrophic coastal ecosystem.
Collapse
Affiliation(s)
- Kieng Soon Hii
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Monaliza Mohd-Din
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia; Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
| | - Zhaohe Luo
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| | - Suh Nih Tan
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Zhen Fei Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Li Keat Lee
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Sandric Chee Yew Leong
- Tropical Marine Science Institute, National University of Singapore, 18 Kent Ridge Road, S2S Building, Singapore, 119227 Singapore
| | - Sing Tung Teng
- Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| | - Xiuyun Cao
- Institute of Hydrobiologia, Chinese Academic of Science, Wuhan, China
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia.
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia.
| |
Collapse
|
19
|
Fu Z, Piumsomboon A, Punnarak P, Uttayarnmanee P, Leaw CP, Lim PT, Wang A, Gu H. Diversity and distribution of harmful microalgae in the Gulf of Thailand assessed by DNA metabarcoding. HARMFUL ALGAE 2021; 106:102063. [PMID: 34154784 DOI: 10.1016/j.hal.2021.102063] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 06/13/2023]
Abstract
Information on the diversity and distribution of harmful microalgae in the Gulf of Thailand is very limited and mainly based on microscopic observations. Here, we collected 44 water samples from the Gulf of Thailand and its adjacent water (Perhentian Island, Malaysia) for comparison in 2018. DNA metabarcoding was performed targeting the partial large subunit ribosomal RNA gene (LSU rDNA D1-D3) and the internal transcribed spacers (ITS1 and ITS2). A total of 50 dinoflagellate genera (made up of 72 species) were identified based on the LSU rDNA dataset, while the results of ITS1 and ITS2 datasets revealed 33 and 32 dinoflagellate genera comprising 69 and 64 species, respectively. Five potentially toxic Pseudo-nitzschia (Bacillariophyceae) species were detected, with four as newly recorded species in the water (Pseudo-nitzschia americana/brasilliana, Pseudo-nitzschia simulans/delicatissima, P. galaxiae and P. multistriata). The highest relative abundances of P. galaxiae and P. multistriata were found in Trat Bay and Chumphon (accounting for 0.20% and 0.06% of total ASVs abundance, respectively). Three paralytic shellfish toxin producing dinoflagellate species were detected: Alexandrium tamiyavanichii, Alexandrium fragae, and Gymnodinium catenatum. The highest abundance of A. tamiyavanichii was found in the surface sample of Chumphon (CHO7 station), accounting for 1.95% of total ASVs abundance. Two azaspiracid producing dinoflagellate species, Azadinium poporum ribotype B, Azadinium spinosum ribotype A, and a pinnatoxin producing dinoflagellate species Vulcanodinium rugosum, with two ribotypes B and C, were revealed from the datasets although with very low abundances. Six fish killing dinoflagellate species, including Margalefidinium polykrikoides group IV, Margalefidinium fulvescens, Karenia mikimotoi, Karenia selliformis ribotype B, Karlodinium australe, and Karlodinium digitatum were detected and all representing new records in this area. The findings of numerous harmful microalgal species in the Gulf of Thailand highlight the potential risk of human intoxication and fish killing events.
Collapse
Affiliation(s)
- Zhengxu Fu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | | | - Porntep Punnarak
- Aquatic Resources Research Institute, Chulalongkorn University, Bangkok 10330, Thailand
| | - Praderm Uttayarnmanee
- Marine and Coastal Resources Research and Development Center, Central Gulf of Thailand, Department of Marine and Coastal Resources, Chumphon 86000, Thailand
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Aijun Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China.
| |
Collapse
|
20
|
Morais SL, Barros P, Santos M, Delerue-Matos C, Gomes AC, Fátima Barroso M. Electrochemical genosensor for the detection of Alexandrium minutum dinoflagellates. Talanta 2021; 222:121416. [PMID: 33167194 DOI: 10.1016/j.talanta.2020.121416] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 07/10/2020] [Accepted: 07/14/2020] [Indexed: 11/18/2022]
Abstract
This work addresses the development of a disposable electrochemical genosensor for the detection of the toxic dinoflagellate, Alexandrium minutum. Analyzing public databases, a specific 70 bp DNA probe, targeting A. minutum, was selected and designed. The genosensor methodology implied the immobilization of a A. minutum-specific DNA-capture probe onto screen-printed gold electrodes (SPGE). To improve both the selectivity and to avoid strong secondary structures, that could hinder the hybridization efficiency, a sandwich format of the A. minutum gene was designed using a fluorescein isothiocyanate-labelled signaling DNA probe and enzymatic amplification of the electrochemical signal. Using this electrochemical genosensor, a concentration range from 0.12 to 1.0 nM, a LD of 24.78 pM with a RSD <5.2% was determined. The genosensor was successfully applied to the selective analysis of the targeted A. minutum specific region denatured genomic DNA extracted from toxic dinoflagellates present in the Atlantic Ocean.
Collapse
Affiliation(s)
- Stephanie L Morais
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico, Rua Dr. António Bernardino de Almeida 431, 4200-072, Porto, Portugal; Escola de Ciências, Universidade do Minho, 4710-057, Braga, Portugal
| | - Piedade Barros
- CISA|ESS, Centro de Investigação em Saúde e Ambiente, Escola Superior de Saúde, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 400, 4200-072, Porto, Portugal
| | - Marlene Santos
- CISA|ESS, Centro de Investigação em Saúde e Ambiente, Escola Superior de Saúde, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 400, 4200-072, Porto, Portugal
| | - Cristina Delerue-Matos
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico, Rua Dr. António Bernardino de Almeida 431, 4200-072, Porto, Portugal
| | - Andreia C Gomes
- Centro de Biologia Molecular e Ambiental (CBMA), Departamento de Biologia, Universidade do Minho, 4710-057, Braga, Portugal
| | - M Fátima Barroso
- REQUIMTE/LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico, Rua Dr. António Bernardino de Almeida 431, 4200-072, Porto, Portugal.
| |
Collapse
|
21
|
Elleuch J, Barkallah M, Smith KF, Ben Neila I, Fendri I, Abdelkafi S. Quantitative PCR assay for the simultaneous identification and enumeration of multiple Karenia species. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:36889-36899. [PMID: 32577959 DOI: 10.1007/s11356-020-09739-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
Quantitative PCR (qPCR) is the method of choice for specific detection and quantification of harmful algal bloom (HAB) species. Development of qPCR assay for simultaneous enumeration of species that frequently co-exist in HABs is required. A high sensitivity TaqMan qPCR assay, using probe and primers, located at ITS1-5.8S-ITS2 rDNA region, detecting, specifically, Karenia selliformis, K. bidigitata, and K. mikimotoi, was designed. ITS1-5.8S-ITS2 rDNA region copy numbers per Karenia cell genome were estimated to 217.697 ± 67.904, allowing cell quantification. An application of the designed methodology in field samples has been conducted, and it showed high sensitivity (detection of around 10-1 cell/100 mg of bivalve mollusk tissue, equivalent to about 20 copies of the target sequence). We suggest that the optimized method could contribute to early detection of three closely related Karenia species in seafood cultivating areas to promote control quality, guarantee a fast and effective intervention, and improve public health prevention.
Collapse
Affiliation(s)
- Jihen Elleuch
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, Sfax, Tunisia.
| | - Mohamed Barkallah
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, Sfax, Tunisia
| | - Kirsty F Smith
- Cawthron Institute, 98 Halifax Street East, Private Bag 2, Nelson, 7042, New Zealand
| | | | - Imen Fendri
- Laboratory of Plant Biotechnology Applied to the Improvement of Cultures, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Slim Abdelkafi
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, Sfax, Tunisia
| |
Collapse
|
22
|
Dzhembekova N, Rubino F, Nagai S, Zlateva I, Slabakova N, Ivanova P, Slabakova V, Moncheva S. Comparative analysis of morphological and molecular approaches integrated into the study of the dinoflagellate biodiversity within the recently deposited Black Sea sediments - benefits and drawbacks. Biodivers Data J 2020; 8:e55172. [PMID: 32903988 PMCID: PMC7447646 DOI: 10.3897/bdj.8.e55172] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/27/2020] [Indexed: 11/23/2022] Open
Abstract
One of the assets, assigned to the phytoplankton resting stages, is that of serving as the “memory” of the aquatic ecosystems and preserved biodiversity in the course of time. However, an accurate cyst identification proves to be a more difficult and extremely challenging process, even today. In order to gain a better taxonomic coverage of cyst assemblages in the Black Sea, an integrated approach of the classical morphological identification with metabarcoding methods (MySeq sequencing of V7-V9 regions of the 18S rDNA) was applied on thirteen surface sediment samples collected from different sites. A total number of 112 dinoflagellate taxa was detected at the species level and ascribed to 51 genera. In general, it is the molecular analysis that yields a higher number of taxa as compared to those obtained through the morphological taxonomy (66 taxa based on the DNA sequences versus 56 morphologically-identified taxa). Besides, it should be pointed out that the integrated dataset includes 14 potentially toxic dinoflagellate species. Discerned, subsequently, was a good dataset consistency for ten species, followed by some discrepancies as to a number of taxa, identified with one of the methods only, due to specific methodological biases. On the whole, it could be concluded that the combination of morphological and molecular methods is likely to increase the potential for a more reliable taxonomic assessment of phytoplankton diversity in marine sediments which, in turn, proves conclusively the utmost importance of the integrated approach.
Collapse
Affiliation(s)
- Nina Dzhembekova
- Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences Varna Bulgaria
| | - Fernando Rubino
- Water Research Institute, Unit Talassografico "A. Cerruti", National Research Council CNR-IRSA, Taranto, Italy Water Research Institute, Unit Talassografico "A. Cerruti", National Research Council CNR-IRSA Taranto Italy
| | - Satoshi Nagai
- National Research Institute of Fisheries Science, Research Center for Aquatic Genomics, Fisheries Research and Education Agency, Yokohama Kanagawa, Japan National Research Institute of Fisheries Science, Research Center for Aquatic Genomics, Fisheries Research and Education Agency Yokohama Kanagawa Japan
| | - Ivelina Zlateva
- Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences Varna Bulgaria
| | - Nataliya Slabakova
- Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences Varna Bulgaria
| | - Petya Ivanova
- Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences Varna Bulgaria
| | - Violeta Slabakova
- Institute of Oceanology "Fridtjof Nansen", Ocean Technologies Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Ocean Technologies Department, Bulgarian Academy of Sciences Varna Bulgaria
| | - Snejana Moncheva
- Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences, Varna, Bulgaria Institute of Oceanology "Fridtjof Nansen", Marine Biology and Ecology Department, Bulgarian Academy of Sciences Varna Bulgaria
| |
Collapse
|
23
|
Chai ZY, Wang H, Deng Y, Hu Z, Zhong Tang Y. Harmful algal blooms significantly reduce the resource use efficiency in a coastal plankton community. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 704:135381. [PMID: 31810673 DOI: 10.1016/j.scitotenv.2019.135381] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/02/2019] [Accepted: 11/02/2019] [Indexed: 06/10/2023]
Abstract
Harmful algal blooms (HABs) have been investigated for their catastrophic effects on public health and aquaculture intensively, but the research about HABs effects on the diversity patterns and intrinsic functions of the plankton community based on a species identification with high resolution and accuracy has been scarce. We therefore investigated the shifts of plankton diversity via pyrosequencing during and around a natural dinoflagellate (Prorocentrum donghaiense) bloom and analyzed the effect of P. donghaiense abundance on the operationally-defined resource use efficiency (RUE) of plankton community to test our hypothesis that outbreaks of HABs will reduce RUE of the plankton community via shifting the plankton community structure, species composition in particular. We found that the species diversity of eukaryotic plankton community was significantly decreased during the bloom, as reflected in OTU (operational taxonomic unit) richness, and Pielou's evenness index. Principal coordinates analysis indicated significant difference in plankton community structure between blooming and non-blooming periods. As hypothesized, the species richness was positively correlated to RUE (defined as the ratio of phytoplankton biomass to total phosphorus), and more importantly, the cell density of P. donghaiense exhibited significant negative correlation with RUE. Our results explicitly demonstrated HABs reduce RUE via reducing species richness (corresponding to a less occupancy of the trophic niches), which supports the previously documented notion that niche partitioning enhances RUE (a key ecosystem function). Also, our work provides striking evidence for the relationship between plankton species richness (or diversity) and community function (resource use efficiency) via studying on HABs, a natural but exceptional phenomenon, in addition to revealing a profound consequence of HABs.
Collapse
Affiliation(s)
- Zhao Yang Chai
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Huan Wang
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunyan Deng
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Zhangxi Hu
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Ying Zhong Tang
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
| |
Collapse
|
24
|
Nagai S, Chen H, Kawakami Y, Yamamoto K, Sildever S, Kanno N, Oikawa H, Yasuike M, Nakamura Y, Hongo Y, Fujiwara A, Kobayashi T, Gojobori T. Monitoring of the toxic dinoflagellate Alexandrium catenella in Osaka Bay, Japan using a massively parallel sequencing (MPS)-based technique. HARMFUL ALGAE 2019; 89:101660. [PMID: 31672234 DOI: 10.1016/j.hal.2019.101660] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 08/10/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Since 2002, blooms of Alexandrium catenella sensu Fraga et al. (2015) and paralytic shellfish toxicity events have occurred almost yearly in Osaka Bay, Japan. To better understand the triggers for reoccurring A. catenella blooms in Osaka Bay, phytoplankton community was monitored during the spring seasons of 2012-2015. Monitoring was performed using massively parallel sequencing (MPS)-based technique on amplicon sequences of the 18S rRNA gene. Dense blooms of A. catenella occurred every year except in 2012, however, there was no significant correlation with the environmental parameters investigated. Plankton community diversity decreased before and middle of the A. catenella blooms, suggesting that the decline in diversity could be an indicator for the bloom occurrence. The yearly abundance pattern of A. catenella cells obtained by morphology-based counting coincided with the relative sequence abundances, which supports the effectiveness of MPS-based phytoplankton monitoring.
Collapse
Affiliation(s)
- Satoshi Nagai
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan.
| | - Hungyen Chen
- Department of Agronomy, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan
| | - Yoko Kawakami
- AXIOHELIX Co. Ltd, -12-17 Kandaizumicho, Chiyoda-ku, Tokyo, 101-0024, Japan
| | - Keigo Yamamoto
- Research Institute of Environment, Agriculture and Fisheries, Osaka Prefecture, 2926-1 Tanigawa, Misaki, Sen-Nan, Osaka, 599-0311, Japan
| | - Sirje Sildever
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Nanako Kanno
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Hiroshi Oikawa
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Motoshige Yasuike
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Yoji Nakamura
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Yuki Hongo
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Atushi Fujiwara
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Takanori Kobayashi
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan
| | - Takashi Gojobori
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| |
Collapse
|