The marine macroalgae of Helgoland (North Sea): an annotated list of records between 1845 and 1999

Bartsch, Inka; Kuhlenkamp, Ralph

doi:10.1007/s101520000050

Cited by 45 publications

(41 citation statements)

References 55 publications

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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%

“…Since the introduction of S. muticum in the 1980s in the south-eastern North Sea, the species has become established as a permanent member of the algal community in the low intertidal and upper subtidal zones in both, rocky and sedimentary environments (Bartsch and Kuhlenkamp 2000;Buschbaum 2005). Despite its successful dispersal and increasing densities, S. muticum has not replaced other indigenous macroalgae, and there is no evidence that the native species in either system are negatively affected by the newcomer.…”

Section: Consequences Of Sargassum Muticum Invasionmentioning

confidence: 99%

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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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Section: Study Sitesmentioning

confidence: 99%

Section: Consequences Of Sargassum Muticum Invasionmentioning

confidence: 99%

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

2005

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“…Two exotic algal species, the red alga Mastocarpus stellatus (since 1983) and the brown alga Sargassum muticum (since 1988) have become very common at Helgoland and are still extending their range around the island (Bartsch and Kuhlenkamp 2000;Reichert 2003). This substantial change in the algal cover of the rocky intertidal and shallow subtidal biotopes will certainly affect the native macroalgal community and the associated macrofauna.…”

Section: Intertidal Macrofaunamentioning

confidence: 99%

Long-term changes in the macrozoobenthos around the rocky island of Helgoland (German Bight, North Sea)

Franke

Gutow

2004

Helgol Mar Res

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The paper briefly summarizes what is known about long-term changes (facts, causes, consequences) in the macrozoobenthos of intertidal and subtidal hardbottom communities around the island of Helgoland (German Bight, North Sea). There is increasing observational evidence that these communities (spectrum and abundances of species) are changing on a long-term temporal scale. The reasons are diverse and mainly anthropogenic. A shift in North Sea climate towards more oceanic conditions may be among the most important factors driving the recent changes in species spectrum. Many of the species which have been recorded as new to the Helgoland area during the past decade are southern (oceanic) species which may be considered as indicators of a warming trend.

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“…The seafloor is characterized by outcropping Mesozoic sediments such as red sandstone, shell-bearing limestone, and chalkstone that form a regular arrangement of ridges and channels. Within the euphotic zone these structures are mostly covered by diverse seaweed species (Bartsch and Kuhlenkamp, 2000). In deeper water the seafloor is generally barren (Lüning, 1990).…”

Section: Study Areamentioning

confidence: 99%

“…Since the macroalgae can only thrive on hard substratum (Lüning, 1990;Bartsch and Kuhlenkamp, 2000), it can further be expected that there are cobbles and rocks wherever macroalgae occur. The reduced blade area over ground in the kelp park (LAI < 1) induces a gradual decrease of roughness and increase of hardness values in these domains as the acoustic signal not only hits the rough and soft blades but also the hard and rugged bedrock substrate.…”

Section: Accordance To Echogram Analysismentioning

confidence: 99%

Predicting spatial kelp abundance in shallow coastal waters using the acoustic ground discrimination system RoxAnn

Mielck

Bartsch

Hass

et al. 2014

Estuarine, Coastal and Shelf Science

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a b s t r a c tKelp forests represent a major habitat type in coastal waters worldwide and their structure and distribution is predicted to change due to global warming. Despite their ecological and economical importance, there is still a lack of reliable spatial information on their abundance and distribution. In recent years, various hydroacoustic mapping techniques for sublittoral environments evolved. However, in turbid coastal waters, such as off the island of Helgoland (Germany, North Sea), the kelp vegetation is present in shallow water depths normally excluded from hydroacoustic surveys. In this study, single beam survey data consisting of the two seafloor parameters roughness and hardness were obtained with RoxAnn from water depth between 2 and 18 m. Our primary aim was to reliably detect the kelp forest habitat with different densities and distinguish it from other vegetated zones. Five habitat classes were identified using underwater-video and were applied for classification of acoustic signatures. Subsequently, spatial prediction maps were produced via two classification approaches: Linear discriminant analysis (LDA) and manual classification routine (MC). LDA was able to distinguish dense kelp forest from other habitats (i.e. mixed seaweed vegetation, sand, and barren bedrock), but no variances in kelp density. In contrast, MC also provided information on medium dense kelp distribution which is characterized by intermediate roughness and hardness values evoked by reduced kelp abundances. The prediction maps reach accordance levels of 62% (LDA) and 68% (MC). The presence of vegetation (kelp and mixed seaweed vegetation) was determined with higher prediction abilities of 75% (LDA) and 76% (MC). Since the different habitat classes reveal acoustic signatures that strongly overlap, the manual classification method was more appropriate for separating different kelp forest densities and low-lying vegetation. It became evident that the occurrence of kelp in this area is not simply linked to water depth. Moreover, this study shows that the two seafloor parameters collected with RoxAnn are suitable indicators for the discrimination of different densely vegetated seafloor habitats in shallow environments.

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The marine macroalgae of Helgoland (North Sea): an annotated list of records between 1845 and 1999

Cited by 45 publications

References 55 publications

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

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

Long-term changes in the macrozoobenthos around the rocky island of Helgoland (German Bight, North Sea)

Predicting spatial kelp abundance in shallow coastal waters using the acoustic ground discrimination system RoxAnn

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