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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied phycology 5 (1993), S. 117-122 
    ISSN: 1573-5176
    Keywords: Gelidium latifolium ; cultivation ; ecotypes ; strain selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Unialgal isolates ofGelidium latifolium from northern Spain and western Norway were compared with respect to specific growth rate, when kept under different combinations of light (20, 50, 100, 200, 300 µmol m-2s-1) and temperature (17, 20, 24, 28, 31 °C.) The Norwegian isolate grew almost twice as fast as the Spanish isolate under all combinations tested. Maximum growth rate for the Norwegian and Spanish isolates was 6.71% d-1 and 3.64% d-1, respectively. The results show the existence of ecotypes and the importance of inoculum selection in the development of a mass cultivation system forGelidium.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied phycology 10 (1998), S. 253-260 
    ISSN: 1573-5176
    Keywords: Gelidium ; reproductive biology ; chromosome number ; life history ; female sterility ; sporeling survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Interfertility has been demonstrated in vitro between isolates of G. pusillum from Norway, France and the British Isles, but anomalies in reproductive behaviour were observed in the two Norwegian isolates. In one of the latter (Fedje), female gametophytes were sterile. Carpogonia and nutritive filaments were differentiated, but further development was always disrupted and carposporangia never formed. On one occasion, bilocular ‘pseudo-cystocarps’ were formed in a self-cross, but no carpospores were produced. Male reproductive structures were functional and used in crossability tests. In the other Norwegian isolate (Solund), only a small percentage of the released tetraspores survived, and most of these had an aberrant dwarfed growth habit. Only a few of several thousand spores produced functional male and female gametophytes of normal appearance. In quantitative experiments, significantly higher sporeling survival was found in one of the French isolates (Cancale) than in the Solund isolate. Stages of the first meiotic division were observed and a haploid chromosome number of approximately n =15 − 20 was counted for the Solund isolate. During the second meiotic division, failure was frequently observed in that cytokinesis took place without completion of nuclear divison. In the French isolates of the same species (Cancale and Wimereux isolates), a haploid chromosome number of n = 20 or 21 was determined during meiosis in tetrasporocytes.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5117
    Keywords: Laminaria hyperborea ; northern limit ; biomass ; age distribution ; production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eight populations of Laminaria hyperborea from wave-exposed localities in Finnmark (70–71°N) were compared with two populations in Vega (65°N). Standing stock in shallow water (3–5 m) was within the same range in the two areas (6–16 kg fr. wt. m−2). Both the highest and lowest value of standing stock were registered in Finnmark. Degree of wave-exposure was determined by the numbers of sectors exposed to open sea at each locality, with each sector given a relative wind force value. The most wave-exposed locality in Vega had a slightly higher annual biomass production as a function of plant age compared with the populations from Finnmark within a similar range of wave exposure. Of the two localities in Vega the most wave-exposed one had a higher annual biomass production per plant than the more sheltered one. The most wave-exposed locality examined was situated in Finnmark and exhibited the lowest annual biomass production per plant. Recruits (one-year-old plants) were found at all the localities except at one locality in Finnmark. The plants reached a higher age in Finnmark (13–18 years) than in Vega (8–9 years).
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5117
    Keywords: kelp ; kelp trawling ; recovery ; epiphytes ; holdfast fauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The kelp Laminaria hyperborea is regularly harvested along the Norwegian coast. Kelp trawling is regulated by restricting this to every 5th year in specified areas. The kelp plants form dense forests, 1–2 m high, and house a large number of epiphytes and associated invertebrates. Kelp, epiphytes, and holdfast (hapteron) fauna were sampled at two different regions in untrawled kelp forest and at sites trawled different number of years ago. We have examined the rate of kelp regrowth after trawling, and in what time scale the associated flora and fauna colonize the trawled areas. The trawl removed all adult kelp plants (the canopy plants), while small understorey kelp plants were left undisturbed. These recruits, given improved light conditions, made the new generation of canopy-forming kelp plants, exceeding a height of 1 m within 2–3 y. The recruitment pattern of the kelp ensures maintenance of kelp forest dominance despite repeated trawling. Both percent cover, abundance and number of epiphytic species increased with time post trawling, but epiphytic communities were not totally re-established before the next trawling episode. Colonization of most species of fauna inhabiting the kelp holdfast were found as early as one year after trawling, but increasing size of the habitat by age of kelp gave room for increasing numbers of both individuals and species. Slow colonization rate by some species might be due to low dispersal potential. Due to a higher maximum age and size of kelp plants in the northernmost region studied, restoration of both kelp and kelp forest community was slower there.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2016-09-06
    Description: This paper focuses on the marine foundation eelgrass species, Zostera marina, along a gradient from the northern Baltic Sea to the north-east Atlantic. This vast region supports a minimum of 1480 km2 eelgrass (maximum 〉2100 km2), which corresponds to more than four times the previously quantified area of eelgrass in Western Europe. Eelgrass meadows in the low salinity Baltic Sea support the highest diversity (4–6 spp.) of angiosperms overall, but eelgrass productivity is low (〈2 g dw m-2 d-1) and meadows are isolated and genetically impoverished. Higher salinity areas support monospecific meadows, with higher productivity (3–10 g dw m-2 d-1) and greater genetic connectivity. The salinity gradient further imposes functional differences in biodiversity and food webs, in particular a decline in number, but increase in biomass of mesograzers in the Baltic. Significant declines in eelgrass depth limits and areal cover are documented, particularly in regions experiencing high human pressure. The failure of eelgrass to re-establish itself in affected areas, despite nutrient reductions and improved water quality, signals complex recovery trajectories and calls for much greater conservation effort to protect existing meadows. The knowledge base for Nordic eelgrass meadows is broad and sufficient to establish monitoring objectives across nine national borders. Nevertheless, ensuring awareness of their vulnerability remains challenging. Given the areal extent of Nordic eelgrass systems and the ecosystem services they provide, it is crucial to further develop incentives for protecting them.
    Type: Article , PeerReviewed
    Format: text
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  • 6
    Publication Date: 2022-01-31
    Description: In the course of the ongoing global intensification and diversification of human pressures, the study of variation patterns of biological traits along environmental gradients can provide relevant information on the performance of species under shifting conditions. The pronounced salinity gradient, co‐occurrence of multiple stressors, and accelerated rates of change make the Baltic Sea and its transition to North Sea a suitable region for this type of study. Focusing on the bladderwrack Fucus vesiculosus, one of the main foundation species on hard‐bottoms of the Baltic Sea, we analyzed the phenotypic variation among populations occurring along 2,000 km of coasts subjected to salinities from 4 to 〉30 and a variety of other stressors. Morphological and biochemical traits, including palatability for grazers, were recorded at 20 stations along the Baltic Sea and four stations in the North Sea. We evaluated in a common modeling framework the relative contribution of multiple environmental drivers to the observed trait patterns. Salinity was the main and, in some cases, the only environmental driver of the geographic trait variation in F. vesiculosus. The decrease in salinity from North Sea to Baltic Sea stations was accompanied by a decline in thallus size, photosynthetic pigments, and energy storage compounds, and affected the interaction of the alga with herbivores and epibiota. For some traits, drivers that vary locally such as wave exposure, light availability or nutrient enrichment were also important. The strong genetic population structure in this macroalgae might play a role in the generation and maintenance of phenotypic patterns across geographic scales. In light of our results, the desalination process projected for the Baltic Sea could have detrimental impacts on F. vesiculosus in areas close to its tolerance limit, affecting ecosystem functions such as habitat formation, primary production, and food supply.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    PANGAEA
    In:  Supplement to: Barboza, Francisco Rafael; Kotta, Jonne; Weinberger, Florian; Jormalainen, Veijo; Kraufvelin, Patrik; Molis, Markus; Schubert, Hendrik; Pavia, Henrik; Nylund, Göran M; Kautsky, Lena; Schagerström, Ellen; Rickert, Esther; Saha, Mahasweta; Fredriksen, Stein; Martin, Georg; Torn, Kaire; Ruuskanen, Ari T; Wahl, Martin (2019): Geographic variation in fitness‐related traits of the bladderwrack Fucus vesiculosus along the Baltic Sea‐North Sea salinity gradient. Ecology and Evolution, 9(16), 9225-9238, https://doi.org/10.1002/ece3.5470
    Publication Date: 2023-01-30
    Description: Data on morphological and biochemical traits of the bladderwrack Fucus vesiculosus were obtained from individuals simultaneously collected in September 2011 in 20 stations along the Baltic Sea and 4 stations in the North Sea. The individuals included in the analysis were collected at 0.5-1.0 m depth. Frond length, frond width, stipe width and number of fronds were directly determined in the field. All collected individuals were transported to the laboratory in cooler boxes at temperatures below 5 °C, then frozen at -20 °C within 12 h, and shipped to the GEOMAR-Helmholtz Centre for Ocean Research Kiel (Germany) on dry ice. Measurements of chlorophyll a and fucoxanthin in surface and tissue extracts, mannitol, phlorotannins and carbon:nitrogen ratio were performed in the laboratory (see further methodological details in the related article). The relative palatability of the algal material collected in all 24 stations was determined in palatability assays, using reconstituted algal pellets and the pan-Baltic grazer Idotea balthica. In addition to the trait information, environmental data on sea surface salinity, sea surface summer temperature, photosynthetically active radiation (PAR), wave exposure and total nitrogen have been obtained from the Swedish Meteorological and Hydrological Institute (SMHI) or local monitoring services.
    Keywords: environmental gradient; foundation species; geographic variation of traits
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
    Publication Date: 2023-01-30
    Keywords: Askoe_2011; Boenhamm_2011; Braennskaer_2011; Code; DkHo; EEr; EKo; EKü; environmental gradient; Eru_2011; Event label; Falshoeft_2011; FBr; FKo; FOu; foundation species; FPäi; FPar; Frond, length; Frond, width; geographic variation of traits; GFa; GHe; GSa; HAND; Helgoland_2011; Horsens_2011; Koiguste_2011; Kotka_2011; Kuedema_2011; Latitude of event; Longitude of event; Nitrogen; Number of fronds; NVe; Outoori_2011; Paeiuaekarit_2011; Paraistenportti_2011; Radiation, photosynthetically active; Salinity; Salzhaff_2011; Sample ID; Sampling by hand; SAs; SBo; Singoe_2011; Skagsudde_2011; Species; SSi; SSk; Station label; Stipe, width; Temperature, water; Verdens-Ende_2011; Wave exposure index
    Type: Dataset
    Format: text/tab-separated-values, 2210 data points
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  • 9
    Publication Date: 2023-01-30
    Keywords: Askoe_2011; Barsebaeck_2011; Boenhamm_2011; Braennskaer_2011; Carbon/Nitrogen ratio; Chlorophyll a; Code; DkHo; EEr; EKo; EKü; environmental gradient; Eru_2011; Event label; Falshoeft_2011; FBr; FKo; FOu; foundation species; FPäi; FPar; Fucoxanthin; geographic variation of traits; GFa; GHe; GrüI; GrüII; GSa; GSy; GWa; HAND; Helgoland_2011; Horsens_2011; Koiguste_2011; Kotka_2011; Kuedema_2011; Latitude of event; Longitude of event; Mannitol; Nitrogen; NVe; Outoori_2011; Paeiuaekarit_2011; Paraistenportti_2011; Phlorotannins; Radiation, photosynthetically active; Ruegen-Ost_2011; Ruegen-West_2011; Salinity; Salzhaff_2011; Sample ID; Sampling by hand; SAs; SBa; SBo; Singoe_2011; Skagsudde_2011; Species; SSi; SSk; Station label; STj; SVa; Sylt_2011; Temperature, water; Tjaernoe_2011; Varberg_2011; Verdens-Ende_2011; Warnemuende_2011; Wave exposure index
    Type: Dataset
    Format: text/tab-separated-values, 3583 data points
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  • 10
    Publication Date: 2023-01-30
    Keywords: Askoe_2011; Barsebaeck_2011; Boenhamm_2011; Braennskaer_2011; Code; DkHo; EEr; EKo; EKü; environmental gradient; Eru_2011; Event label; Falshoeft_2011; FBr; FKo; FOu; foundation species; FPäi; FPar; geographic variation of traits; GFa; GHe; GrüI; GrüII; GSa; GSy; GWa; HAND; Helgoland_2011; Horsens_2011; Koiguste_2011; Kotka_2011; Kuedema_2011; Latitude of event; Longitude of event; Nitrogen; NVe; Outoori_2011; Paeiuaekarit_2011; Palatability; Paraistenportti_2011; Radiation, photosynthetically active; Ruegen-Ost_2011; Ruegen-West_2011; Salinity; Salzhaff_2011; Sample ID; Sampling by hand; SAs; SBa; SBo; Singoe_2011; Skagsudde_2011; Species; SSi; SSk; Station label; STj; SVa; Sylt_2011; Temperature, water; Tjaernoe_2011; Varberg_2011; Verdens-Ende_2011; Warnemuende_2011; Wave exposure index
    Type: Dataset
    Format: text/tab-separated-values, 2397 data points
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