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Sato Y, Endo H, Oikawa H, Kanematsu K, Naka H, Mogamiya M, Kawano S, Kazama Y. Sexual Difference in the Optimum Environmental Conditions for Growth and Maturation of the Brown Alga Undaria pinnatifida in the Gametophyte Stage. Genes (Basel) 2020; 11:E944. [PMID: 32824303 PMCID: PMC7463851 DOI: 10.3390/genes11080944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/04/2020] [Accepted: 08/14/2020] [Indexed: 11/16/2022] Open
Abstract
Undaria pinnatifida is an annual brown kelp growing naturally in coastal areas as a major primary producer in temperate regions and is cultivated on an industrial scale. Kelps have a heteromorphic life cycle characterized by a macroscopic sporophyte and microscopic sexual gametophytes. The sex-dependent effects of different environmental factors on the growth and maturation characteristics of the gametophyte stage were investigated using response surface methodology. Gametophytes were taken from three sites in Japan: Iwate Prefecture, Tokushima Prefecture, and Kagoshima Prefecture in order to confirm the sexual differences in three independent lines. Optimum temperature and light intensity were higher for males (20.7-20.9 °C and 28.6-33.7 µmol m-2 s-1, respectively) than females (16.5-19.8 °C and 26.9-32.5 µmol m-2 s-1), and maturity progressed more quickly in males than females. Optimum wavelengths of light for growth and maturation of the gametophytes were observed for both blue (400-500 nm, λmax 453 nm) and green (500-600 nm; λmax 525 nm) lights and were sex-independent. These characteristics were consistent among the three regional lines. Slower growth optima and progress of maturation could be important for female gametophytes to restrict fertilization and sporophyte germination to the lower water temperatures of autumn and winter, and suggest that the female gametophyte may be more sensitive to temperature than the male. The sexual differences in sensitivity to environmental factors improved the synchronicity of sporeling production.
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Affiliation(s)
- Yoichi Sato
- Bio-resources Business Development Division, Riken Food Co., Ltd., Miyagi 985-0844, Japan;
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama 351-0198, Japan
| | - Hikaru Endo
- Faculty of Fisheries, Kagoshima University, Kagoshima 890-0056, Japan;
| | - Hiroki Oikawa
- Connected Solutions Company, Panasonic Co., Tokyo 104-0061, Japan; (H.O.); (K.K.); (H.N.)
| | - Koichi Kanematsu
- Connected Solutions Company, Panasonic Co., Tokyo 104-0061, Japan; (H.O.); (K.K.); (H.N.)
- SiM24 Co., Ltd., Osaka 540-6104, Japan
| | - Hiroyuki Naka
- Connected Solutions Company, Panasonic Co., Tokyo 104-0061, Japan; (H.O.); (K.K.); (H.N.)
- SiM24 Co., Ltd., Osaka 540-6104, Japan
| | - Miho Mogamiya
- Bio-resources Business Development Division, Riken Food Co., Ltd., Miyagi 985-0844, Japan;
| | - Shigeyuki Kawano
- Future Center Initiative, The University of Tokyo, Saitama 277-0871, Japan;
| | - Yusuke Kazama
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama 351-0198, Japan
- Faculty of Bioscience and Biotechnology, Fukui Prefectural University, Fukui 910-1195, Japan
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Lee H, Depuydt S, Choi S, Han T, Park J. Rapid toxicity assessment of six antifouling booster biocides using a microplate-based chlorophyll fluorescence in Undaria pinnatifida gametophytes. Ecotoxicology 2020; 29:559-570. [PMID: 32333251 DOI: 10.1007/s10646-020-02207-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
Biocides of antifouling agents can cause problems in marine ecosystems by damaging to non-target algal species. Aquatic bioassays are important means of assessing the quality of water containing mixtures of contaminants and of providing a safety standard for water management in an ecological context. In this study, a rapid, sensitive and inexpensive test method was developed using free-living male and female gametophytes of the brown macroalga Undaria pinnatifida. A conventional fluorometer was employed to evaluate the acute (48 h) toxic effects of six antifouling biocides: 4,5-Dichloro-2-octyl-isothiazolone (DCOIT), diuron, irgarol, medetomidine, tolylfluanid, zinc pyrithione (ZnPT). The decreasing toxicity in male and female gametophytes as estimated by EC50 (effective concentration at which 50% inhibition occurs) values was: diuron (0.037 and 0.128 mg l-1, respectively) > irgarol (0.096 and 0.172 mg l-1, respectively) > tolylfluanid (0.238 and 1.028 mg l-1, respectively) > DCOIT (1.015 and 0.890 mg l-1, respectively) > medetomidine (12.032 and 12.763 mg l-1, respectively). For ZnPT, 50% fluorescence inhibition of U. pinnatifida gametophytes occurred at concentrations above 0.4 mg l-1. The Undaria method is rapid, simple, practical, and cost-effective for the detection of photosynthesis-inhibiting biocides, thus making a useful tool for testing the toxicity of antifouling agents in marine environments.
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Affiliation(s)
- Hojun Lee
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Stephen Depuydt
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Soyeon Choi
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
| | - Taejun Han
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Jihae Park
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea.
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Epstein G, Hawkins SJ, Smale DA. Identifying niche and fitness dissimilarities in invaded marine macroalgal canopies within the context of contemporary coexistence theory. Sci Rep 2019; 9:8816. [PMID: 31217462 PMCID: PMC6584561 DOI: 10.1038/s41598-019-45388-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 06/05/2019] [Indexed: 11/09/2022] Open
Abstract
Contemporary coexistence theory provides a framework for predicting invasiveness and impact of Invasive Non-Native Species (INNS) by incorporating differences in niche and fitness between INNS and co-occurring native species. The widespread invasive kelp Undaria pinnatifida is considered a high-risk INNS, although a robust evidence base regarding its invasiveness and impact is lacking in many regions. Invaded macroalgal canopies at nine coastal sites in the southwest UK were studied over three years to discern whether Undaria is coexisting or competing with native canopy-forming species across different habitat types. Spatial, temporal and depth-related trends in species distributions and abundance were recorded within intertidal and subtidal rocky reef as well as on marina pontoons. A primary succession experiment also examined competitive interactions between species. In rocky reef habitats, Undaria had lower fitness compared to long-lived native perennials, but was able to coexist due to niche dissimilarity between species. In contrast, Undaria was likely to be competing with short-lived native annuals on rocky reef due to large niche overlap and similar fitness. In marina habitats, Undaria dominated over all other canopy formers due to low niche diversification and higher fitness. Generalisations on INNS impact cannot be made across habitats or species, without considering many abiotic factors and biotic interactions.
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Affiliation(s)
- Graham Epstein
- Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK.
- Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZH, UK.
| | - Stephen J Hawkins
- Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK
- Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZH, UK
| | - Dan A Smale
- Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK
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Wang X, Shan T, Pang S. Effects of Cobalt on Spore Germination, Gametophyte Growth and Gametogenesis of Undaria pinnatifida (Phaeophyceae). Bull Environ Contam Toxicol 2019; 102:784-788. [PMID: 30989278 DOI: 10.1007/s00128-019-02614-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
With rapid development of the construction of nuclear power plants along the coast, the concern of negative effects of potentially unexpected release of nuclides on marine organisms has increased. Cobalt (Co) is one of the crucial nuclides in nuclear polluted seawater. The effect of its presence in seawater on life cycle of macroalgae has seldom been studied. In this investigation, a series of Co concentrations including 1, 10, 100 μg L-1, and 1, 10 mg L-1 (the background concentration of Co in culture seawater was determined to be at the level of 0.75 ± 0.11 μg L-1) were used to test the effects of their presence on spore germination, gametophyte growth and gametogenesis of the important brown macroalga Undaria pinnatifida. It was found that the spore germination rate of 10 mg L-1 group was significantly lower than that of the control group after 1- and 2 days exposure. The gametophyte sizes of 1 and 10 mg L-1 groups were much smaller than that of the control group after 6- and 12-days exposure. Oogonia and juvenile sporophytes were observed to appear in 1, 10 μg L-1 and the control groups after 12 and 15 days, respectively, but not in the higher concentration groups. In the recovery test, sporophytes appeared in the 100 μg L-1 group on the 5th day, but not in 1 and 10 mg L-1 groups. These results demonstrate that presence of Co at high concentrations in seawater disturbs the life cycle by suppressing both the gametophyte growth and gametogenesis in U. pinnatifida.
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Affiliation(s)
- Xuemei Wang
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Rd, Qingdao, 266071, China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 7 Nanhai Rd, Qingdao, 266071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tifeng Shan
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Rd, Qingdao, 266071, China.
- Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China.
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 7 Nanhai Rd, Qingdao, 266071, China.
| | - Shaojun Pang
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Rd, Qingdao, 266071, China.
- Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China.
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 7 Nanhai Rd, Qingdao, 266071, China.
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Gao X, Kim JH, Park SK, Yu OH, Kim YS, Choi HG. Diverse responses of sporophytic photochemical efficiency and gametophytic growth for two edible kelps, Saccharina japonica and Undaria pinnatifida, to ocean acidification and warming. Mar Pollut Bull 2019; 142:315-320. [PMID: 31232310 DOI: 10.1016/j.marpolbul.2019.03.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 03/25/2019] [Accepted: 03/30/2019] [Indexed: 06/09/2023]
Abstract
Ocean acidification and warming represent major environmental threats to kelp mariculture. In this study, sporophytic photochemical efficiency and gametophytic growth of Saccharina japonica and Undaria pinnatifida were evaluated under different pCO2 levels (360, 720, and 980 ppmv) and temperatures (5, 10, 15, and 20 °C for sporophytes; 15 and 20 °C for gametophytes). Sporophytic photochemical efficiencies of both kelps were significantly greater at 720 ppmv than at 360 and 980 ppmv. Female gametophytes of both kelps grew significantly better at 360 ppmv than at higher pCO2 levels. The growth of U. pinnatifida gametophytes was significantly greater at 20 °C than at 15 °C, while no significant difference was observed for the growth of S. japonica. These results indicate that increased pCO2 stimulated sporophytic photochemical efficiency while inhibited gametophytic growth of these kelps, which might negatively affect their seedling cultivation. U. pinnatifida exhibited higher productivity in warmer ocean than S. japonica.
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Affiliation(s)
- Xu Gao
- Faculty of Biological Science and Sea & Biotech, Wonkwang University, Iksan 54538, Republic of Korea
| | - Ju-Hyoung Kim
- Faculty of Marine Applied Biosciences, Kunsan National University, Gunsan 54150, Republic of Korea
| | - Seo Kyoung Park
- Faculty of Biological Science and Sea & Biotech, Wonkwang University, Iksan 54538, Republic of Korea
| | - Ok Hwan Yu
- Marine Ecosystem Research Center, Korea Institute of Ocean Science & Technology, Busan 49111, Republic of Korea
| | - Young Sik Kim
- Department of Marine Biotechnology, Kunsan National University, Gunsan 54150, Republic of Korea
| | - Han Gil Choi
- Faculty of Biological Science and Sea & Biotech, Wonkwang University, Iksan 54538, Republic of Korea.
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Epstein G, Smale DA. Between-habitat variability in the population dynamics of a global marine invader may drive management uncertainty. Mar Pollut Bull 2018; 137:488-500. [PMID: 30503460 DOI: 10.1016/j.marpolbul.2018.10.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 10/17/2018] [Accepted: 10/26/2018] [Indexed: 06/09/2023]
Abstract
Understanding population dynamics of established invasive species is important for designing effective management measures and predicting factors such as invasiveness and ecological impact. The kelp Undaria pinnatifida has spread to most temperate regions of the world, however a basic understanding of population dynamics is lacking for many regions. Here, Undaria was monitored for 2 years, at 9 sites, across 3 habitats to investigate habitat-related variation in population structure, reproductive capacity and morphology. Populations on marina pontoons were distinct from those in reef habitats, with extended recruitment periods and higher abundance, biomass, maturation rates and fecundity; potentially driven by lower inter-specific and higher intra-specific competition within marinas. This suggests that artificial habitats are likely to facilitate the spread, proliferation and reproductive fitness of Undaria across its non-native range. More broadly, generalising population dynamics of invasive species across habitat types is problematic, thus adding high complexity to management options.
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Affiliation(s)
- Graham Epstein
- Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth PL1 2PB, UK; Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, UK.
| | - Dan A Smale
- Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth PL1 2PB, UK
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Leal PP, Hurd CL, Sander SG, Armstrong E, Fernández PA, Suhrhoff TJ, Roleda MY. Copper pollution exacerbates the effects of ocean acidification and warming on kelp microscopic early life stages. Sci Rep 2018; 8:14763. [PMID: 30283041 PMCID: PMC6170414 DOI: 10.1038/s41598-018-32899-w] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 09/18/2018] [Indexed: 11/12/2022] Open
Abstract
Ocean warming (OW), ocean acidification (OA) and their interaction with local drivers, e.g., copper pollution, may negatively affect macroalgae and their microscopic life stages. We evaluated meiospore development of the kelps Macrocystis pyrifera and Undaria pinnatifida exposed to a factorial combination of current and 2100-predicted temperature (12 and 16 °C, respectively), pH (8.16 and 7.65, respectively), and two copper levels (no-added-copper and species-specific germination Cu-EC50). Meiospore germination for both species declined by 5-18% under OA and ambient temperature/OA conditions, irrespective of copper exposure. Germling growth rate declined by >40%·day-1, and gametophyte development was inhibited under Cu-EC50 exposure, compared to the no-added-copper treatment, irrespective of pH and temperature. Following the removal of copper and 9-day recovery under respective pH and temperature treatments, germling growth rates increased by 8-18%·day-1. The exception was U. pinnatifida under OW/OA, where growth rate remained at 10%·day-1 before and after copper exposure. Copper-binding ligand concentrations were higher in copper-exposed cultures of both species, suggesting that ligands may act as a defence mechanism of kelp early life stages against copper toxicity. Our study demonstrated that copper pollution is more important than global climate drivers in controlling meiospore development in kelps as it disrupts the completion of their life cycle.
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Affiliation(s)
- Pablo P Leal
- Department of Botany, University of Otago, 479 Great King Street, Dunedin, 9016, New Zealand.
- Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade Battery Point, Hobart, 7004, Tasmania, Australia.
- Departamento de Repoblación y Cultivo, Instituto de Fomento Pesquero (IFOP), Balmaceda 252, Puerto Montt, Casilla, 665, Chile.
| | - Catriona L Hurd
- Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade Battery Point, Hobart, 7004, Tasmania, Australia
| | - Sylvia G Sander
- NIWA/ University of Otago Research Centre for Oceanography, Chemistry Department, Union Place West, Dunedin 9016, New Zealand, Dunedin, 9016, New Zealand
- Marine Environment Study Laboratory, International Atomic Energy Agency, 4 Quai Antione 1er, 98000, Monaco, Monaco
| | - Evelyn Armstrong
- NIWA/ University of Otago Research Centre for Oceanography, Chemistry Department, Union Place West, Dunedin 9016, New Zealand, Dunedin, 9016, New Zealand
| | - Pamela A Fernández
- Centro i~mar, Universidad de Los Lagos, Camino a Chinquihue Km 6, Puerto Montt, Casilla, 557, Chile
| | - Tim J Suhrhoff
- ETH Zürich, Institute of Geochemistry and Petrology, Department of Earth Sciences, Clausiusstrasse 25, 8092, Zürich, Switzerland
| | - Michael Y Roleda
- Department of Botany, University of Otago, 479 Great King Street, Dunedin, 9016, New Zealand
- Norwegian Institute of Bioeconomy Research, Kudalsveien 6, 8027, Bodø, Norway
- The Marine Science Institute, College of Science, University of the Philippines Diliman, Quezon City, Philippines
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South PM, Floerl O, Forrest BM, Thomsen MS. A review of three decades of research on the invasive kelp Undaria pinnatifida in Australasia: An assessment of its success, impacts and status as one of the world's worst invaders. Mar Environ Res 2017; 131:243-257. [PMID: 28958575 DOI: 10.1016/j.marenvres.2017.09.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 09/10/2017] [Accepted: 09/16/2017] [Indexed: 06/07/2023]
Abstract
Marine invasive macroalgae can have severe local-scale impacts on ecological communities. The kelp Undaria pinnatifida is one of the most successful marine invasive species worldwide, and is widely regarded as one of the worst. Here, we review research on Undaria in Australasia, where the kelp is established throughout much of New Zealand and south-eastern Australia. The presence of Undaria for at least three decades in these locations makes Australasia one of the longest-invaded bioregions globally, and a valuable case study for considering Undaria's invasion success and associated impacts. In Australasia, Undaria has primarily invaded open spaces, turf communities, and gaps in native canopies within a relatively narrow elevation band on rocky shores. Despite its high biomass, Undaria has relatively few direct impacts on native species, and can increase community-wide attributes such as primary productivity and the provision of biogenic habitat. Therefore, Australasian Undaria research provides an example of a decoupling between the success and impact of an invasive species. Undaria will most likely continue to spread along thousands of kilometres of rocky coastline in temperate Australasia, due to its tolerance to large variations in temperature, ability to exploit disturbances to local communities, and the continued transfer among regions via vessel movements and aquaculture activities. However, the spread of Undaria remains difficult to manage as eradication is challenging and seldom successful. Therefore, understanding potential invasion pathways, maintaining native canopy-forming species that limit Undaria success, and effectively managing anthropogenic vectors of Undaria spread, should be key management priorities.
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Affiliation(s)
- Paul M South
- Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand; Institute of Marine Science, University of Auckland, Private bag 92019, Auckland, New Zealand.
| | - Oliver Floerl
- Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand
| | - Barrie M Forrest
- Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand
| | - Mads S Thomsen
- Marine Ecology Research Group, School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; UWA Oceans Institute & School of Biological Sciences, University of Western Australia, Crawley, WA 6009, Australia
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Tang J, Wang M, Zhou Q, Nagata S. Improved composting of Undaria pinnatifida seaweed by inoculation with Halomonas and Gracilibacillus sp. isolated from marine environments. Bioresour Technol 2011; 102:2925-30. [PMID: 21145233 DOI: 10.1016/j.biortech.2010.11.064] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 11/14/2010] [Accepted: 11/16/2010] [Indexed: 05/30/2023]
Abstract
Composting of the Undaria pinnatifida (wakame) seaweed was conducted after inoculation with 6×10(8) CFU g(-1)Halomonas sp. AW4 and the alginate-degrading bacterium Gracilibacillus sp. A7. Inoculation with strains A7 and AW4 resulted in 27.8% and 24.7% degradation of U. pinnatifida dry mass after 168 h, whereas only 17.5% degradation occurred in the uninoculated control. The C/N ratio decreased in the A7 and AW4 inoculated compost by 7.0% and 9.2% after 72 h, but increased by 11.5% in the control. Inoculation with A7 resulted in 2.8 times faster degradation of alginate and 1.2 and 1.6 times higher levels of reducing sugars and unsaturated sugars than inoculation with AW4. The compost produced from the inoculation with A7 had low plant toxicity as measured by germination experiment. The results suggest that inoculation of wakame with alginate-degrading bacteria not only shortened the length of composting but also created seaweed compost with good fertilizer qualities.
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Affiliation(s)
- Jingchun Tang
- Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, China.
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Voisin M, Daguin C, Engel C, Grulois D, Javanaud C, Viard F. [Introduction and establishment processes of marine species: a study case with the Japanese brown kelp Undaria pinnatifida]. J Soc Biol 2007; 201:259-66. [PMID: 18157078 DOI: 10.1051/jbio:2007037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The number of biological introductions has increased since the 1970's and is now considered as the second major cause of the biodiversity erosion, after fragmentation or disappearance of habitat. Beyond the threat they represent for the ecosystem equilibrium, introduced species are interesting models to study fundamental issues in ecology and evolution like the processes of dispersal and adaptation to novel environments. In this context, species introduced over a large geographic range and spectrum of habitats provide an excellent opportunity for comparing the mechanisms that promote introduction and settlement between different environments. In this paper, based on a case study, the worldwide introduction of the brown alga Undaria pinnatifida, and on the use of molecular tools, we aim at examining several processes promoting or occurring during biological introductions. Our results showed that i) multiple processes can account for the success of the pandemic introduction of this alga, highlighting the necessity to study introduced species in relation with the ecosystem they invaded, ii) the recurrence of introductions is a critical component in the dynamics of settlement and iii) human activities can play a major role not only during the primary introduction but also for the sustainable settlement of introduced species in natural environments by providing reservoir of migrants. Taken together, these results demonstrate that the complexity of mechanisms occurring in biological invasion require spatial but also long-term analysis.
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Affiliation(s)
- Marie Voisin
- Unité "Adaptation & Diversité en Milieu Marin" (UMR CNRS-UPMC 7144), Equipe Evolution et Génétique des Populations Marines, Station Biologique de Roscoff, Place Georges-Teissier, BP 74, 29682 Roscoff cedex
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Xu Z, Dapeng L, Hanhua H, Tianwei T. Growth promotion of vegetative gametophytes of Undaria pinnatifida by blue light. Biotechnol Lett 2005; 27:1467-75. [PMID: 16231218 DOI: 10.1007/s10529-005-1313-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2005] [Accepted: 07/15/2005] [Indexed: 10/25/2022]
Abstract
Through an acclimation period of 10 days, compared to white light, the maximal net photosynthetic rates were significantly higher for gametophytes of Undaria pinnatifida cultivated under blue light (400-500 nm), and were lower under red light (600-700 nm). Chlorophyll c and the carotenoid content of gametophytes were similar under blue light and red light but were much lower under white light. The growth rate of female gametophytes under blue light was higher than that under other lights, and the growth rate of male gametophytes showed little variation with respect to blue and white light. Male and female gametophytes were mixed together to form sporophytes under white, blue and red light. After approximately 5 days, 50% gametophytes became fertile under blue and white light, but remained vegetative under red light after 10 days.
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Affiliation(s)
- Zhang Xu
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, 100029, Beijing, China.
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Zou N, Zhou B, Li B, Sun D, Zeng C. Effects of cell density, light intensity and mixing on Undaria pinnatifida gametophyte activity in a photobioreactor. Biomol Eng 2003; 20:281-4. [PMID: 12919809 DOI: 10.1016/s1389-0344(03)00071-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An on-line controlled 7 l sterilizable photobioreactor was used for the optimisation of a culture of gametophytes of Undaria pinnatifida. The gametophytes, which had been stored for three years in a culture cabinet at 16 degrees C, could rapidly grow in the photobioreactor under controlled conditions. The rate of increase of dissolved oxygen and pH were used to monitor the photosynthetic activity. Optimal gametophytes density changed varying the light intensity. The optimal cell densities were 3.24 and 3.45 g FW l(-1) when the cultures were exposed to 61.7 and 82.3 microE m(-2) s(-1), respectively. The optimal cell density was higher under a high photon flux density (PFD) than under low PFD. On the other hand, the optimal light intensities were different for different cell density cultures. The light saturation point was higher at high cell density cultures than at low cell density cultures. The optimal rotational speed was 150 rpm for high cell density culture in the photobioreactor.
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Affiliation(s)
- Ning Zou
- Biology Department, Yantai Teachers' College, Yantai, Shandong province 264025, China.
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