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  • Afanasyev, Dmitry F.  (2)
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  • 1
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2019
    In:  Botanica Marina Vol. 62, No. 1 ( 2019-02-25), p. 63-73
    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
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
    detail.hit.zdb_id: 1475447-2
    detail.hit.zdb_id: 1197-6
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    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
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
    detail.hit.zdb_id: 1475447-2
    detail.hit.zdb_id: 1197-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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