Meeresalgen von Helgoland

Kornmann, Peter; Sahling, P. H.

doi:10.1007/bf01611137

Cited by 142 publications

(57 citation statements)

References 54 publications

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“…The relatively low proportions of A. nodosum and S. muticum in all three study areas suggest that the supply of seaweeds from Helgoland, where A. nodosum, S. muticum and Fucus spp. grow in dense populations (Kornmann and Sahling, 1977;Munda and Markham, 1982;Bartsch and Kuhlenkamp, 2000), only contributes a minor fraction of the standing stocks of floating seaweeds in the German Bight. Instead, the high proportion of Fucus spp.…”

Section: Floating Seaweedmentioning

confidence: 99%

Spatio-temporal distribution of floating objects in the German Bight (North Sea)

Thiel

Hinojosa

Joschko

et al. 2011

Journal of Sea Research

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Floating objects facilitate the dispersal of marine and terrestrial species but also represent a major environmental hazard in the case of anthropogenic plastic litter. They can be found throughout the world's oceans but information on their abundance and the spatio-temporal dynamics is scarce for many regions of the world. This information, however, is essential to evaluate the ecological role of floating objects. Herein, we report the results from a ship-based visual survey on the abundance and composition of flotsam in the German Bight (North Sea) during the years 2006 to 2008. The aim of this study was to identify potential sources of floating objects and to relate spatio-temporal density variations to environmental conditions. Three major flotsam categories were identified: buoyant seaweed (mainly fucoid brown algae), natural wood and anthropogenic debris. Densities of these floating objects in the German Bight were similar to those reported from other coastal regions of the world. Temporal variations in flotsam densities are probably the result of seasonal growth cycles of seaweeds and fluctuating river runoff (wood). Higher abundances were often found in areas where coastal fronts and eddies develop during calm weather conditions. Accordingly, flotsam densities were often higher in the inner German Bight than in areas farther offshore. Import of floating objects and retention times in the German Bight are influenced by wind force and direction. Our results indicate that a substantial amount of floating objects is of coastal origin or introduced into the German Bight from western source areas such as the British Channel. Rapid transport of floating objects through the German Bight is driven by strong westerly winds and likely facilitates dispersal of associated organisms and gene flow among distant populations.

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Section: Floating Seaweedmentioning

confidence: 99%

Spatio-temporal distribution of floating objects in the German Bight (North Sea)

Thiel

Hinojosa

Joschko

et al. 2011

Journal of Sea Research

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“…Laminaria sp.). A comprehensive description of the biotopes and the algal community of Helgoland is given by Kornmann and Sahling (1977), Bartsch and Kuhlenkamp (2000) and Bartsch and Tittley (2004).…”

Section: Study Sitesmentioning

confidence: 99%

How an introduced seaweed can affect epibiota diversity in different coastal systems

2005

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Invasions by non-indigenous species have the potential to alter the biodiversity of recipient systems. The magnitude of this effect often depends on the nature of the invaded communities and the ecology of the invader. We investigated the impacts of the Japanese seaweed Sargassum muticum (Phaeophyceae, Fucales) on biodiversity in a rocky and sedimentary environment on two islands in the North Sea. In each case, we compared the epibiota of non-indigenous S. muticum with epibiota communities on taxonomically related and structurally similar native seaweed hosts. Total and average species richness on S. muticum were similar on the rocky shore (60 species and 22±6 species, respectively) and the sandy shore (64 species and 20±3 species, respectively). However, community structure and species composition differed significantly between the environments. On the rocky shore, another native fucoid seaweed, Halidrys siliquosa, supported an epibiota community very similar to that of the invader. On the sandy shore, the only other abundant native habitat-providing algal species was Fucus vesiculosus. This species supported a different and less diverse assemblage of associated taxa. We conclude that S. muticum enhances epibiota diversity in the sedimentary environment, probably by increasing the substratum availability and habitat heterogeneity. In contrast, it has negligible impacts on epibiota diversity in the rocky shore environment, where it does not represent a fundamentally new habitat component. We conclude that even within the same region, the consequences of non-indigenous species on biodiversity cannot be generalised but depend on the composition and structural complexity of the species in the recipient community.

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“…With the relaxed model, the upward shift of occurrence of F. serrutus into the F. cesiculosus zone in release experiments performed by Hawkins and Hartno11 (1985) might also be explained. Schonbeck and Norton (1978) The better performance of intertidal algae near the lower boundaries of natural occurrence has often been observed (Niemeck andMathieson 1976, Kornmann andSahling 1977. pers. observation for all Helgoland Fucus spp.).…”

Section: Application Of a "Relaxed" Version Of The Competitive Hiearcmentioning

confidence: 92%

A Competitive Hierarchy Model Integrating Roles of Physiological Competence and Competitive Ability Does Not Provide a Mechanistic Explanation for the Zonation of Three Intertidal Fucus Species in Europe

Karez¹,

Chapman²

1998

Oikos

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Meeresalgen von Helgoland

Cited by 142 publications

References 54 publications

Spatio-temporal distribution of floating objects in the German Bight (North Sea)

Spatio-temporal distribution of floating objects in the German Bight (North Sea)

How an introduced seaweed can affect epibiota diversity in different coastal systems

A Competitive Hierarchy Model Integrating Roles of Physiological Competence and Competitive Ability Does Not Provide a Mechanistic Explanation for the Zonation of Three Intertidal Fucus Species in Europe

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