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  • 1
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    Salinity and host drive Ulva ‐associated bacterial communities across the Atlantic–Baltic Sea gradient
    Wiley ; 2023
    In:  Molecular Ecology Vol. 32, No. 23 ( 2023-12), p. 6260-6277
    Details
    In: Molecular Ecology, Wiley, Vol. 32, No. 23 ( 2023-12), p. 6260-6277
    Abstract: The green seaweed Ulva is a model system to study seaweed–bacteria interactions, but the impact of environmental drivers on the dynamics of these interactions is little understood. In this study, we investigated the stability and variability of the seaweed‐associated bacteria across the Atlantic–Baltic Sea salinity gradient. We characterized the bacterial communities of 15 Ulva sensu lato species along 2,000 km of coastline in a total of 481 samples. Our results demonstrate that the Ulva ‐associated bacterial composition was strongly structured by both salinity and host species (together explaining between 34% and 91% of the variation in the abundance of the different bacterial genera). The largest shift in the bacterial consortia coincided with the horohalinicum (5–8 PSU, known as the transition zone from freshwater to marine conditions). Low‐salinity communities especially contained high relative abundances of Luteolibacter , Cyanobium , Pirellula , Lacihabitans and an uncultured Spirosomaceae, whereas high‐salinity communities were predominantly enriched in Litorimonas , Leucothrix , Sulfurovum , Algibacter and Dokdonia . We identified a small taxonomic core community (consisting of Paracoccus , Sulfitobacter and an uncultured Rhodobacteraceae), which together contributed to 14% of the reads per sample, on average. Additional core taxa followed a gradient model, as more core taxa were shared between neighbouring salinity ranges than between ranges at opposite ends of the Atlantic–Baltic Sea gradient. Our results contradict earlier statements that Ulva ‐associated bacterial communities are taxonomically highly variable across individuals and largely stochastically defined. Characteristic bacterial communities associated with distinct salinity regions may therefore facilitate the host's adaptation across the environmental gradient.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.v32.23
    DOI: 10.1111/mec.16462
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2023
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  • 2
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    Cultivation conditions affect the monosaccharide composition in Ulva fenestrata
    Springer Science and Business Media LLC ; 2020
    In:  Journal of Applied Phycology Vol. 32, No. 5 ( 2020-10), p. 3255-3263
    Details
    In: Journal of Applied Phycology, Springer Science and Business Media LLC, Vol. 32, No. 5 ( 2020-10), p. 3255-3263
    Abstract: In recent years, the interest in using seaweed for the sustainable production of commodities has been increasing as seaweeds contain many potentially worthwhile compounds. Thus, the extraction and refining processes of interesting compounds from seaweeds is a hot research topic but has been found to have problems with profitability for novel applications. To increase the economic potential of refining seaweed biomass, the content of the compounds of interest should be maximized, which can potentially be achieved through optimization of cultivation conditions. In this study, we studied how the monosaccharide composition of the green seaweed species Ulva fenestrata is influenced by the abiotic factors; irradiance, temperature, nitrate, phosphate, and pCO 2 . It was evident that lower nitrate concentration and cultivation at elevated temperature increased monosaccharide contents. A 70% increase in iduronic acid and a 26% increase in rhamnose content were seen under elevated irradiance and temperature conditions, though the absolute differences in monosaccharide concentration were small. Irradiance and nitrate impacted the ratio between iduronic and rhamnose, which is an indicator of the ulvan structure. These results could potentially be utilized to coax the ulvan towards specific bioactivities, and thus have a considerable impact on a potential biorefinery centered around Ulva .
    Type of Medium: Online Resource
    ISSN: 0921-8971 , 1573-5176
    URL: Article
    DOI: 10.1007/s10811-020-02138-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
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    detail.hit.zdb_id: 1477703-4
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  • 3
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    The unheeded existence of the tubular greens: molecular analyses reveal the distribution of a new Ulva species (Ulvophyceae, Chlorophyta), Ulva capillata sp. nov. in the Atlantic-Baltic Sea transect
    Springer Science and Business Media LLC ; 2023
    In:  Journal of Applied Phycology Vol. 35, No. 1 ( 2023-02), p. 509-522
    Details
    In: Journal of Applied Phycology, Springer Science and Business Media LLC, Vol. 35, No. 1 ( 2023-02), p. 509-522
    Abstract: The ubiquitous and species rich genus Ulva comprises entities of green macroalgae with variable morphologies. Ulva species are important from ecological and economic perspectives, but their identification is often problematic. Current knowledge on Ulva diversity has focused mainly on foliose individuals of temperate regions, but genetic and morphological data on tubular species are often insufficient and the species richness is ambiguous due to the lack of molecularly identified type vouchers. Together with a previous study, our study demonstrates that due to the crypticity of tubular entities of the genus Ulva present in the Atlantic-Baltic Sea transect, certain species remained undetected until recently whereas molecular evidence of other historically identified species is missing. An entity which appears to be a relatively frequent species in the Atlantic-Baltic Sea transect and which was probably mis-identified with other species in the past is here described as Ulva capillata sp. nov.. The description is based on molecular identification using tuf A and rbcL sequences, and by comparing the species´ phylogenetic relationships, distribution and range margins in the Atlantic-Baltic Sea transect, as well as on morpho-anatomical characters, and early ontogenetic development. By comparisons with closely related and potentially morphologically overlapping species concepts we were able to identify the uniqueness of U. capillata . Therefore, the description of U. capillata as a new species within the genus Ulva is supported by a combination of molecular, morphological, and ontogentic evidence which confirm their uniqueness in comparison to other species concepts. Furthermore, our results strongly emphasize the importance and necessity to molecularly investigate especially tubular historic type vouchers within the genus Ulva to facilitate a clear species identification to omit continuing with taxonomic confusion and ongoing misapplication of names of e.g. cryptic species concepts within this important green algal genus.
    Type of Medium: Online Resource
    ISSN: 0921-8971 , 1573-5176
    URL: Article
    DOI: 10.1007/s10811-022-02886-w
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
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    detail.hit.zdb_id: 1477703-4
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  • 4
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    Surveying seaweeds from the Ulvales and Fucales in the world’s most frequently used artificial waterway, the Kiel Canal
    Walter de Gruyter GmbH ; 2019
    In:  Botanica Marina Vol. 62, No. 1 ( 2019-02-25), p. 51-61
    Details
    In: Botanica Marina, Walter de Gruyter GmbH, Vol. 62, No. 1 ( 2019-02-25), p. 51-61
    Abstract: The Kiel Canal is one of the world’s most frequently used inland waterways and connects the SW Baltic Sea with the Wadden Sea. At the same time, the canal is a highly eutrophicated environment that is characterized by salinities that range from 3 to 16. This brackish character could make the Kiel Canal an important stepping stone for the introductions of species into the inner Baltic Sea. It could also hinder the identification of native and introduced species, given the fact that salinity sometimes severely affects algal morphology. Here we report on a survey of introduced and native seaweed species in the canal, focusing on the dominant groups, which are Fucales and Ulvales. Of the Fucales, the introduced species Fucus evanescens was detected nearly exclusively inside the canal, while Fucus vesiculosus dominated rockweed communities directly outside the sluice gates. Morphological analysis and genetic barcoding distinguished three species of Ulvales, Ulva linza, Ulva intestinalis and an unknown and possibly introduced species of the genus Blidingia . Species distributions and – in the case of U. intestinalis – branching patterns were clearly affected by salinity, while thallus sizes appeared to be affected by the specific eutrophication status of sites within the canal.
    Type of Medium: Online Resource
    ISSN: 1437-4323 , 0006-8055
    URL: Article
    DOI: 10.1515/bot-2018-0020
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
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    detail.hit.zdb_id: 1197-6
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  • 5
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    Salinity as a tool for strain selection in recirculating land-based production of Ulva spp. from germlings to adults
    Springer Science and Business Media LLC ; 2023
    In:  Journal of Applied Phycology Vol. 35, No. 5 ( 2023-10), p. 1971-1986
    Details
    In: Journal of Applied Phycology, Springer Science and Business Media LLC, Vol. 35, No. 5 ( 2023-10), p. 1971-1986
    Abstract: The genus Ulva is globally distributed and has been thoroughly studied because of its functional biochemical composition, rapid growth rates and opportunistic features, and interest in Ulva cultivation is growing worldwide. In Europe, mostly near- and on-shore flow-through cultivation systems are used and land-based recirculating aquaculture systems (RAS) using fresh water or artificial seawater have not been developed for Ulva . While RAS provides quality control and can be located inland, maintenance costs are high. Using selected strains adapted to low-salinity could reduce seawater production costs and improve the economic feasibility. Therefore, our study assessed how salinity can be used as a tool for strain selection and optimization of functional traits. Growth rates and antioxidant activity of three species (four strains) of tubular and foliose Ulva from the NE-Atlantic and Mediterranean (foliose: Ulva lacinulata – two geographical strains, tubular: Ulva linza and Ulva flexuosa ) were followed for three weeks at salinities ranging from 10 to 30 PSU. The tubular strains achieved optimal growth at a lower salinity than U. lacinulata . However, growth rates of both foliose strains were higher than of tubular strains, even at sub-optimal salinity. Therefore, U. lacinulata is a good candidate for RAS with artificial seawater, and the cost of salt can be reduced by up to 33.3% (20 PSU) without significantly reducing the growth rate of U. lacinulata . Higher antioxidant activity was achieved by reducing the salinity to 10 PSU for 10 days, suggesting that the functional traits of cultivated Ulva lacinulata can be optimized prior to harvest.
    Type of Medium: Online Resource
    ISSN: 0921-8971 , 1573-5176
    URL: Article
    DOI: 10.1007/s10811-023-02960-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1002324-0
    detail.hit.zdb_id: 1477703-4
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  • 6
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    Conspecificity of the model organism Ulva mutabilis and Ulva compressa (Ulvophyceae, Chlorophyta)
    Wiley ; 2019
    In:  Journal of Phycology Vol. 55, No. 1 ( 2019-02), p. 25-36
    Details
    In: Journal of Phycology, Wiley, Vol. 55, No. 1 ( 2019-02), p. 25-36
    Abstract: As one of the most abundant and ubiquitous representatives of marine and brackish coastal macrophytobenthos communities, the genus Ulva is not only an important primary producer but also of ecological and morphogenetic interest to many scientists. Ulva mutabilis became an important model organism to study morphogenesis and mutualistic interactions of macroalgae and microorganisms. Here, we report that our collections of Ulva compressa Linnaeus (1753) from Germany are conspecific with the type strains of the model organism U. mutabilis Føyn (1958), which were originally collected at Olhão on the south coast of Portugal and have from that time on been maintained in culture as gametophytic and parthenogenetic lab strains. Different approaches were used to test conspecificity: (i) comparisons of vegetative and reproductive features of cultured material of U. mutabilis and German U. compressa demonstrated a shared morphological pattern; (ii) gametes of U. compressa and U. mutabilis successfully mated and developed into fertile sporophytic first‐generation offspring; (iii) molecular phylogenetics and species delimitation analyses based on the Generalized Mixed Yule‐Coalescent method showed that U. mutabilis isolates (sl‐G[mt+]) and (wt‐G[mt‐] ) and U. compressa belong to a unique Molecular Operational Taxonomic Unit. According to these findings, there is sufficient evidence that U. mutabilis and U. compressa should be regarded as conspecific.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2019.55.issue-1
    DOI: 10.1111/jpy.12804
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2019
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    detail.hit.zdb_id: 1478748-9
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  • 7
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    Phylogeny and ecology of the green seaweed Ulva
    Walter de Gruyter GmbH ; 2024
    In:  Botanica Marina Vol. 0, No. 0 ( 2024-02-29)
    Details
    In: Botanica Marina, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2024-02-29)
    Type of Medium: Online Resource
    ISSN: 0006-8055 , 1437-4323
    URL: Article
    DOI: 10.1515/bot-2024-0005
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2024
    detail.hit.zdb_id: 1475447-2
    detail.hit.zdb_id: 1197-6
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  • 8
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    Vegetation of the supralittoral and upper sublittoral zones of the Western German Baltic Sea coast: a phytosociological study
    Walter de Gruyter GmbH ; 2022
    In:  Botanica Marina Vol. 65, No. 2 ( 2022-04-26), p. 121-133
    Details
    In: Botanica Marina, Walter de Gruyter GmbH, Vol. 65, No. 2 ( 2022-04-26), p. 121-133
    Abstract: Supralittoral and shallow water seaweed communities are particularly exposed to impacts such as climate change and disturbance by humans. Therefore, their classification, the study of composition, and the monitoring of their structural changes are particularly important. A phytosociological survey of the supralittoral and upper sublittoral vegetation of the South West Baltic Sea revealed eight phytobenthos communities with two variants comprising 35 taxa of macrophytes (18 taxa of Chlorophyta, 13 taxa of Rhodophyta and four taxa of Phaeophyceae, Ochrophyta). Five of the eight communities were dominated by Ulvales ( Ulva intestinalis , Kornmannia leptoderma , and three Blidingia species), the other three by Fucus vesiculosus . Most Fucus vesiculosus -dominated communities contained U. intestinalis and U. linza as subdominants. Only one of the communities had until now been described as an association ( Ulvetum intestinalis  Feldman 1937). The syntaxonomic composition of the investigated vegetation includes both phytocenoses with the domination of green algae ( Ulvetum intestinalis  Feldman 1937 and communities of Blidingia marginata, unidentified Blidingia spp. and Kornmannia leptoderma ), as well as a number of communities dominated by Fucus vesiculosus . Mainly boreal Atlantic species and cosmopolitans make up the bulk of the species in these associations.
    Type of Medium: Online Resource
    ISSN: 0006-8055 , 1437-4323
    URL: Article
    DOI: 10.1515/bot-2021-0026
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
    detail.hit.zdb_id: 1475447-2
    detail.hit.zdb_id: 1197-6
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  • 9
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    New records from the southern North Sea and first records from the Baltic Sea of Kornmannia leptoderma
    Walter de Gruyter GmbH ; 2019
    In:  Botanica Marina Vol. 62, No. 1 ( 2019-02-25), p. 63-73
    Details
    In: Botanica Marina, Walter de Gruyter GmbH, Vol. 62, No. 1 ( 2019-02-25), p. 63-73
    Abstract: Combined genetic, morphological and ontogenetic observations show that the circumarctic boreal green algal macrophyte Kornmannia leptoderma has expanded its distribution range into the Baltic Sea, on a German coastal section of 220 km length. The species is also again (or still) established at its former extreme southern distribution limit in the North Sea, the German island of Helgoland, where it has not been detected during the last four decades. Macroscopic visible sporophytes of K. leptoderma are nowadays present in the Baltic Sea and at Helgoland from February to September, while they were in the past only detected from February to May at Helgoland. This capacity for formation of sporophytes in summer correlates with the circumstance that K. leptoderma from the Baltic Sea can complete its life cycle at 15°C while several studies conducted decades ago with material from Helgoland and from Pacific coasts consistently reported an inhibition of the algal gametogenesis at temperatures that exceed 12°C. Possibly K. leptoderma has undergone adaptations that facilitate its spread into warmer environments, unless the Kornmannia present in the Baltic Sea and on Helgoland today represents a newly introduced cryptic species.
    Type of Medium: Online Resource
    ISSN: 1437-4323 , 0006-8055
    URL: Article
    DOI: 10.1515/bot-2018-0019
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
    detail.hit.zdb_id: 1475447-2
    detail.hit.zdb_id: 1197-6
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  • 10
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    Effects of irradiance, temperature, nutrients, and pCO2 on the growth and biochemical composition of cultivated Ulva fenestrata
    Springer Science and Business Media LLC ; 2020
    In:  Journal of Applied Phycology Vol. 32, No. 5 ( 2020-10), p. 3243-3254
    Details
    In: Journal of Applied Phycology, Springer Science and Business Media LLC, Vol. 32, No. 5 ( 2020-10), p. 3243-3254
    Abstract: Ulva fenestrata is an economically and ecologically important green algal species with a large potential in seaweed aquaculture due to its high productivity, wide environmental tolerance, as well as interesting functional and nutritional properties. Here, we performed a series of manipulative cultivation experiments in order to investigate the effects of irradiance (50, 100, and 160 μmol photons m −2  s −1 ), temperature (13 and 18 °C), nitrate ( 〈  5, 150, and 500 μM), phosphate ( 〈  1 and 50 μM), and p CO 2 (200, 400, and 2500 ppm) on the relative growth rate and biochemical composition (fatty acid, protein, phenolic, ash, and biochar content) in indoor tank cultivation of Swedish U. fenestrata . High irradiance and low temperature were optimal for the growth of this northern hemisphere U. fenestrata strain, but addition of nutrients or changes in p CO 2 levels were not necessary to increase growth. Low irradiance resulted in the highest fatty acid, protein, and phenolic content, while low temperature had a negative effect on the fatty acid content but a positive effect on the protein content. Addition of nutrients (especially nitrate) increased the fatty acid, protein, and phenolic content. High nitrate levels decreased the total ash content of the seaweeds. The char content of the seaweeds did not change in response to any of the manipulated factors, and the only significant effect of changes in p CO 2 was a negative relationship with phenolic content. We conclude that the optimal cultivation conditions for Swedish U. fenestrata are dependent on the desired biomass traits (biomass yield or biochemical composition).
    Type of Medium: Online Resource
    ISSN: 0921-8971 , 1573-5176
    URL: Article
    DOI: 10.1007/s10811-020-02155-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1002324-0
    detail.hit.zdb_id: 1477703-4
    SSG: 12
    SSG: 14
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