GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Online Resource  (13)
  • Wiley  (13)
  • 1
    Online Resource
    Online Resource
    Responses of the kelp Saccharina latissima (Phaeophyceae) to the warming Arctic: from physiology to transcriptomics
    Wiley ; 2020
    In:  Physiologia Plantarum Vol. 168, No. 1 ( 2020-01), p. 5-26
    Details
    In: Physiologia Plantarum, Wiley, Vol. 168, No. 1 ( 2020-01), p. 5-26
    Abstract: The Arctic region is currently facing substantial environmental changes due to global warming. Melting glaciers cause reduced salinity environments in coastal Arctic habitats, which may be stressful for kelp beds. To investigate the responses of the kelp Saccharina latissima to the warming Arctic, we studied the transcriptomic changes of S. latissima from Kongsfjorden (Svalbard, Norway) over a 24‐hour exposure to two salinities (Absolute Salinity [S A ] 20 and 30) after a 7‐day pre‐acclimation at three temperatures (0, 8 and 15°C). In addition, corresponding physiological data were assessed during an 11‐days salinity/temperature experiment. Growth and maximal quantum yield for photosystem II fluorescence were positively affected by increased temperature during acclimation, whereas hyposalinity caused negative effects at the last day of treatment. In contrast, hyposalinity induced marked changes on the transcriptomic level. Compared to the control (8°C – S A 30), the 8°C – S A 20 exhibited the highest number of differentially expressed genes (DEGs), followed by the 0°C – S A 20. Comparisons indicate that S. latissima tends to convert its energy from primary metabolism (e.g. photosynthesis) to antioxidant activity under hyposaline stress. The increase in physiological performance at 15°C shows that S. latissima in the Arctic region can adjust and might even benefit from increased temperatures. However, in Arctic fjord environments its performance might become impaired by decreased salinity as a result of ice melting.
    Type of Medium: Online Resource
    ISSN: 0031-9317 , 1399-3054
    URL: Issue
    URL: Article
    DOI: 10.1111/ppl.v168.1
    DOI: 10.1111/ppl.13009
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 208872-1
    detail.hit.zdb_id: 2020837-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Modulation of physiological performance by temperature and salinity in the sugar kelp Saccharina latissima
    Wiley ; 2021
    In:  Phycological Research Vol. 69, No. 1 ( 2021-01), p. 48-57
    Details
    In: Phycological Research, Wiley, Vol. 69, No. 1 ( 2021-01), p. 48-57
    Abstract: The sugar kelp Saccharina latissima experiences a wide range of environmental conditions along its geographical and vertical distribution range. Temperature and salinity are two critical drivers influencing growth, photosynthesis and biochemical composition. Moreover, interactive effects might modify the results described for single effects. In shallow water coastal systems, exposure to rising temperatures and low salinity are expected as consequence of global warming, increased precipitation and coastal run‐off. To understand the acclimation mechanisms of S. latissima to changes in temperature and salinity and their interactions, we performed a mechanistic laboratory experiment in which juvenile sporophytes from Brittany, France were exposed to a combination of three temperatures (0, 8 and 15°C) and two salinity levels (20 and 30 psu (practical salinity units)). After a temperature acclimation of 7 days, sporophytes were exposed to low salinity (20 psu) for a period of 11 days. Growth, and maximal quantum yield of photosystem II ( F v/ F m), pigments, mannitol content and C:N ratio were measured over time. We report for the first time in S. latissima a fivefold increase in the osmolyte mannitol in response to low temperature (0°C) compared to 8 and 15°C that may have ecological and economic implications. Low temperatures significantly affected all parameters, mostly in a negative way. Chlorophyll a , the accessory pigment pool, growth and F v/ F m were significantly lower at 0°C, while the de‐epoxidation state of the xanthophyll cycle was increased at both 0 and 8°C compared to 15°C. Mannitol content and growth decreased with decreased salinity; in contrast, pigment content and F v/ F m were to a large extent irresponsive to salinity. In comparison to S. latissima originating from an Arctic population, despite some reported differences, this study reveals a remarkably similar impact of temperature and salinity variation, reflecting the large degree of adaptability in this species.
    Type of Medium: Online Resource
    ISSN: 1322-0829 , 1440-1835
    URL: Issue
    URL: Article
    DOI: 10.1111/pre.v69.1
    DOI: 10.1111/pre.12443
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2020835-2
    detail.hit.zdb_id: 1312995-8
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Loss of a chloroplast encoded function could influence species range in kelp
    Wiley ; 2019
    In:  Ecology and Evolution Vol. 9, No. 15 ( 2019-08), p. 8759-8770
    Details
    In: Ecology and Evolution, Wiley, Vol. 9, No. 15 ( 2019-08), p. 8759-8770
    Abstract: Kelps are important providers and constituents of marine ecological niches, the coastal kelp forests. Kelp species have differing distribution ranges, but mainly thrive in temperate and arctic regions. Although the principal factors determining biogeographic distribution ranges are known, genomics could provide additional answers to this question. We sequenced DNA from two Laminaria species with contrasting distribution ranges, Laminaria digitata and Laminaria solidungula . Laminaria digitata is found in the Northern Atlantic with a southern boundary in Brittany (France) or Massachusetts (USA) and a northern boundary in the Arctic, whereas L. solidungula is endemic to the Arctic only. From the raw reads of DNA, we reconstructed both chloroplast genomes and annotated them. A concatenated data set of all available brown algae chloroplast sequences was used for the calculation of a robust phylogeny, and sequence variations were analyzed. The two Laminaria chloroplast genomes are collinear to previously analyzed kelp chloroplast genomes with important exceptions. Rearrangements at the inverted repeat regions led to the pseudogenization of ycf 37 in L. solidungula , a gene possibly required under high light conditions. This defunct gene might be one of the reasons why the habitat range of L. solidungula is restricted to lowlight sublittoral sites in the Arctic. The inheritance pattern of single nucleotide polymorphisms suggests incomplete lineage sorting of chloroplast genomes in kelp species. Our analysis of kelp chloroplast genomes shows that not only evolutionary information could be gleaned from sequence data. Concomitantly, those sequences can also tell us something about the ecological conditions which are required for species well‐being.
    Type of Medium: Online Resource
    ISSN: 2045-7758 , 2045-7758
    URL: Issue
    URL: Article
    DOI: 10.1002/ece3.2019.9.issue-15
    DOI: 10.1002/ece3.5428
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2635675-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Effects of ocean acidification on growth and physiology of U lva lactuca ( C hlorophyta) in a rockpool‐scenario
    Wiley ; 2013
    In:  Phycological Research Vol. 61, No. 3 ( 2013-07), p. 180-190
    Details
    In: Phycological Research, Wiley, Vol. 61, No. 3 ( 2013-07), p. 180-190
    Abstract: Rising atmospheric CO 2 ‐concentrations will have severe consequences for a variety of biological processes. We investigated the responses of the green alga U lva lactuca ( L innaeus) to rising CO 2 ‐concentrations in a rockpool scenario. U . lactuca was cultured under aeration with air containing either preindustrial pCO 2 (280 μatm) or the pCO 2 predicted by the end of the 21st century (700 μatm) for 31 days. We addressed the following question: Will elevated CO 2 ‐concentrations affect photosynthesis (net photosynthesis, maximum relative electron transport rate ( rETR (max)), maximum quantum yield ( Fv/Fm ), pigment composition) and growth of U . lactuca in rockpools with limited water exchange? Two phases of the experiment were distinguished: In the initial phase (day 1–4) the S eawater C arbonate S ystem ( SWCS ) of the culture medium could be adjusted to the selected atmospheric pCO 2 condition by continuous aeration with target pCO 2 values. In the second phase (day 4–31) the SWCS was largely determined by the metabolism of the growing U . lactuca biomass. In the initial phase, Fv/Fm and rETR (max) were only slightly elevated at high CO 2 ‐concentrations, whereas growth was significantly enhanced. After 31 days the Chl   a content of the thalli was significantly lower under future conditions and the photosynthesis of thalli grown under preindustrial conditions was not dependent on external carbonic anhydrase. Biomass increased significantly at high CO 2 ‐concentrations. At low CO 2 ‐concentrations most adult thalli disintegrated between day 14 and 21, whereas at high CO 2 ‐concentrations most thalli remained integer until day 31. Thallus disintegration at low CO 2 ‐concentrations was mirrored by a drastic decline in seawater dissolved inorganic carbon and HCO 3 − . Accordingly, the SWCS differed significantly between the treatments. Our results indicated a slight enhancement of photosynthetic performance and significantly elevated growth of U . lactuca at future CO 2 ‐concentrations. The accelerated thallus disintegration at high CO 2 ‐concentrations under conditions of limited water exchange indicates additional CO 2 effects on the life cycle of U . lactuca when living in rockpools.
    Type of Medium: Online Resource
    ISSN: 1322-0829 , 1440-1835
    URL: Issue
    URL: Article
    DOI: 10.1111/pre.2013.61.issue-3
    DOI: 10.1111/pre.12006
    Language: English
    Publisher: Wiley
    Publication Date: 2013
    detail.hit.zdb_id: 2020835-2
    detail.hit.zdb_id: 1312995-8
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Prevailing sea surface temperatures inhibit summer reproduction of the kelp L aminaria digitata at H elgoland ( N orth S ea)
    Wiley ; 2013
    In:  Journal of Phycology Vol. 49, No. 6 ( 2013-12), p. 1061-1073
    Details
    In: Journal of Phycology, Wiley, Vol. 49, No. 6 ( 2013-12), p. 1061-1073
    Abstract: The impact of abiotic factors on kelp sporophyte reproduction has rarely been investigated. L aminaria digitata (Hudson) J.V. Lamouroux is one of the few summer fertile L aminaria species worldwide and reproduction is subjected to relatively high water temperatures. We investigated the impact of prevailing summer temperatures (~18°C in August) on the induction of sporangia, meiospore release, and germination at the island of H elgoland ( N orth S ea). At H elgoland, fertile sporophytes are found between April and December with a maximum in late summer. While released meiospore numbers were constant between June and October, germination rates decreased significantly in summer. Short‐term exposure of mature sori to 17°C–22°C induced a significantly higher meiospore release indicating enhancement of sporulation by elevated temperatures. Induction of sporangia on vegetative blade disks was not possible at 20°C, and fertility was only 20% at 18°C–19°C, but it was 100% in cool temperatures of 1°C–10°C. It was shown for the first time in a kelp species that “sporogenesis” is the life‐cycle process with the narrowest temperature window compared to growth or survival of the sporophyte or reproduction, growth, and survival of the gametophyte. We incorporated several parameters (induction time, fertile area, and relative fertility) into a “Reproductive efficiency index.” This indicates that sporogenesis of L . digitata is a cold‐adapted process with an optimum at (5)–10°C. The results show that the population at H elgoland is at its reproduction limit despite the existence of other geographically more southerly located populations.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2013.49.issue-6
    DOI: 10.1111/jpy.12125
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2013
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    The challenge of estimating kelp production in a turbid marine environment
    Wiley ; 2023
    In:  Journal of Phycology Vol. 59, No. 3 ( 2023-06), p. 518-537
    Details
    In: Journal of Phycology, Wiley, Vol. 59, No. 3 ( 2023-06), p. 518-537
    Abstract: Coastal kelp forests produce substantial marine carbon due to high annual net primary production (NPP) rates, but upscaling of NPP estimates over time and space remains difficult. We investigated the impact of variable underwater photosynthetically active radiation (PAR) and photosynthetic parameters on photosynthetic oxygen production of Laminaria hyperborea , the dominant NE‐Atlantic kelp species, throughout summer 2014. Collection depth of kelp had no effect on chlorophyll a content, pointing to a high photoacclimation potential of L. hyperborea towards incident light. However, chlorophyll a and photosynthesis versus irradiance parameters differed significantly along the blade gradient when normalized to fresh mass, potentially introducing large uncertainties in NPP upscaling to whole thalli. Therefore, we recommend a normalization to kelp tissue area, which is stable over the blade gradient. Continuous PAR measurements revealed a highly variable underwater light climate at our study site (Helgoland, North Sea) in summer 2014, reflected by PAR attenuation coefficients (K d ) between 0.28 and 0.87 m −1 . Our data highlight the importance of continuous underwater light measurements or representative average values using a weighted K d to account for large PAR variability in NPP calculations. Strong winds in August increased turbidity, resulting in a negative carbon balance at depths 〉 3–4 m over several weeks, considerably impacting kelp productivity. Estimated daily summer NPP over all four depths was 1.48 ± 0.97 g C · m −2 seafloor · d −1 for the Helgolandic kelp forest, which is in the range of other kelp forests along European coastlines.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.v59.3
    DOI: 10.1111/jpy.13327
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    A REAPPRAISAL OF PORPHYRA AND BANGIA (BANGIOPHYCIDAE, RHODOPHYTA) IN THE NORTHEAST ATLANTIC BASED ON THE rbc L– rbc S INTERGENIC SPACER
    Wiley ; 1998
    In:  Journal of Phycology Vol. 34, No. 6 ( 1998-12), p. 1069-1074
    Details
    In: Journal of Phycology, Wiley, Vol. 34, No. 6 ( 1998-12), p. 1069-1074
    Abstract: Sequence data of the rbc L –rbc S noncoding intergenic spacer of the plastid genome for 47 specimens of Porphyra and Bangia from the northeast Atlantic reveal that they fall into 11 distinct sequences: P. purpurea, P. dioica (includes a sample of P. “ochotensis” from Helgoland), P. amplissima (includes P. thulaea and British records of P. “miniata” ), P. linearis, P. umbilicalis, P. “miniata”, B. atropurpurea s.l. from Denmark and B. atropurpurea s.l. from Wales, P. drachii, P. leucosticta (includes a British record of P. “miniata var. abyssicola” ), and P. “insolita” (includes P. “yezoensis” from Helgoland). Of these, data obtained for P. purpurea , P. dioica, P. amplissima, P. linearis, P. umbilicalis, P. drachii, and P. leucosticta were based on type specimens or material compared with types. Comparison of sequence data for Porphyra spp. and Bangia atropurpurea s.l. (including B. fuscopurpurea, the type species of Bangia ) confirms that the species are congeneric. The data also confirm that the number of layers that make up the Porphyra thallus are not taxonomically significant. Comparison of sequence data for species from the northeast Atlantic with those for material of two species from the Pacific reveals that the species fall into two distinct groupings: an Atlantic group, containing P. purpurea, P. dioica, P. amplissima, P. linearis, P. umbilicalis, P. “miniata”, and B. atropurpurea, and a Pacific group, containing P. “pseudolinearis”, P. drachii, P. leucosticta, P. “yezoensis” (including a sample of P. “tenera” ), and P. “insolita” (including P. “yezoensis” from Helgoland). The possibility of alien species in the northeast Atlantic is discussed.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Article
    DOI: 10.1046/j.1529-8817.1998.341069.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 1998
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    DNA barcoding and mucilage ducts in the stipe reveal the presence of Hedophyllum nigripes (Laminariales, Phaeophyceae) in Kongsfjorden (Spitsbergen)
    Wiley ; 2020
    In:  Journal of Phycology Vol. 56, No. 5 ( 2020-10), p. 1245-1254
    Details
    In: Journal of Phycology, Wiley, Vol. 56, No. 5 ( 2020-10), p. 1245-1254
    Abstract: The Arctic Ocean is a unique ecosystem hosting a biodiversity that has not yet been elucidated in full detail. There is increasing evidence that there are more kelp species constricted to Arctic/sub‐Arctic habitats hitherto not well investigated, such as Hedophyllum nigripes, which is morphologically very similar to cold‐temperate Laminaria digitata. Hedophyllum nigripes was originally described as L. nigripes by Agardh from Spitsbergen but has often been misidentified as L. digitata in the European Arctic. We initiated a systematic algal survey along a depth gradient (0–7.5 m) in Kongsfjorden (Spitsbergen) in June and July 2015 and thereby confirmed a predominant presence of H. nigripes (73%) . Hedophyllum nigripes is occurring between 0 and 7.5 m while L. digitata was most abundant at 2.5 m depth. Hedophyllum nigripes individuals were generally younger (2.3 vs. 3.6 years) and stipe and blade length shorter (31 vs. 54 cm and 76 vs. 96 cm, respectively) compared to L. digitata . A combination of molecular (COI‐5P) and morpho‐anatomical tools (presence of sori and mucilage ducts in the stipe) was used to differentiate specimens of H. nigripes and L. digitata . Both kelp species were indistinguishable in most cases by external blade and stipe morphology. The different blade shapes represented different ontogenetic stages rather than phenotypic plasticity. The presence of mucilage ducts in the stipe was correlated with H. nigripes and changed with depth from 17%, 36%, and 85% at 2.5, 5, and 7.5 m, respectively. In addition, all summer fertile specimens were L. digitata .
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.v56.5
    DOI: 10.1111/jpy.13012
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    SPOROGENESIS UNDER ULTRAVIOLET RADIATION IN LAMINARIA DIGITATA (PHAEOPHYCEAE) REVEALS PROTECTION OF PHOTOSENSITIVE MEIOSPORES WITHIN SORAL TISSUE: PHYSIOLOGICAL AND ANATOMICAL EVIDENCE1 : PHOTOPROTECTIVE ROLE OF PARAPHYSES
    Wiley ; 2011
    In:  Journal of Phycology Vol. 47, No. 3 ( 2011-06), p. 603-614
    Details
    In: Journal of Phycology, Wiley, Vol. 47, No. 3 ( 2011-06), p. 603-614
    Type of Medium: Online Resource
    ISSN: 0022-3646
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2011.47.issue-3
    DOI: 10.1111/j.1529-8817.2011.00998.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2011
    detail.hit.zdb_id: 281226-5
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Temperature responses of macroalgae from the tropical island Hainan (P.R. China)
    Wiley ; 1997
    In:  Phycological Research Vol. 45, No. 2 ( 1997-06), p. 91-104
    Details
    In: Phycological Research, Wiley, Vol. 45, No. 2 ( 1997-06), p. 91-104
    Abstract: The temperature tolerances of 24 tropical macroalgae collected on Hainan Island (P.R. China) were investigated. For some isolates, growth response curves were also determined. The upper survival temperatures (USTs, 32–37°C) of these tropical west Pacific strains are similiar to those of tropical Atlantic species. With regard to their lower survival temperatures (LSTs) the species investigated show high variations: 12 species have LSTs between 16 and 7°C ( Hypnea musciformis (Wulfen) Lamx. var esperi J, Ag., Centroceras clavulatum (C. Ag) Mont., Falkenbergia hillebrandii (Bornet) Falkenberg, Gelidiopsis intricata (Ag.) Vickers, Halymenia maculata J. Ag., Hypnea cenomyce J. Ag., Hypnea spinella (C. Ag.) Kütz., Gracilaria changii (Xia et Abott) Abott, Chang et Xia, Dictyopteris repens (Okam.) Boerg., Laurencia cartilaginea Yamada, Gelidium pusillum (Stackh.) Le Jol., Laurencia sp.). Their LSTs and temperature requirements for growth (range: 15–30 °C, optimum: 25–30 °C) are mostly similar to those of tropical west Atlantic and amphi‐Atlantic (sub)tropical macroalgae as well as to tropical isolates of species with an Atlantic tropical to warm‐temperate distribution. The remaining 12 species have LSTs between 6 and 1 °C ( Ulva conglobata Kjellm., Ulva fasciata Delile, Padina boryana Thivy, Dictyosphaeria cavernosa (Forssk.) Boerg., Boodlea composita (Harv.) Brand, Boergesenia forbesii (Harv.) Feldm., Cladophora vagabunda (L.) van den Hoek, Enteromorpha compressa (L,) Grev., Enteromorpha intestinalis (L.) Link, Gracilaria tenuistipitata Chang et Xia, var liui Chang et Xia, Monostroma nitidum Wittr. and Valonia aegagropila C. Ag.). Their LSTs are mostly similar to those of Atlantic macroalgae with a tropical to (warm‐) temperate distribution. The results are discussed with respect to the factors which may have triggered the development of the temperature requirements of the various species.
    Type of Medium: Online Resource
    ISSN: 1322-0829 , 1440-1835
    URL: Issue
    URL: Article
    DOI: 10.1111/pre.1997.45.issue-2
    DOI: 10.1111/j.1440-1835.1997.tb00068.x
    Language: English
    Publisher: Wiley
    Publication Date: 1997
    detail.hit.zdb_id: 2020835-2
    detail.hit.zdb_id: 1312995-8
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...