Marine algae of Helgoland: Second supplement

Kornmann, Peter; Sahling, P. H.

doi:10.1007/bf02366253

Cited by 33 publications

(19 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, during the last 3 yr, they have become increasingly invaded by the Pacific oyster Crassostrea gigas (Diederich 2006), leading to a shift in landscape from mussel beds to oyster reefs. Introduced by oyster aquaculture, Sargassum muticum has spread in the shallow subtidal zone since 1993 in the range of mussel beds, oyster reefs and breakwaters (Kornmann & Sahling 1994, Buschbaum 2005, Buschbaum et al 2006. Studies were conducted in a S. muticum bed located in the subtidal zone on the northern side of Koenigshafen Bay (a shallow subsystem of the SyltRømø Bight) and on unvegetated soft sediments located about 3.5 km south, in the reach of a sheltering breakwater (List Breakwater), off the village of List (Fig.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Native pipefish Entelurus aequoreus are promoted by the introduced seaweed Sargassum muticum in the northern Wadden Sea, North Sea

Polte¹,

Buschbaum²

2008

Aquat. Biol.

View full text Add to dashboard Cite

After the major loss of eelgrass habitats in the 1930s the snake pipefish Entelurus aequoreus was considered to be rare in the Wadden Sea (south-eastern North Sea, German Bight). We hypothesize that a sudden increase in pipefish abundance observed in the area since 2004 is related to new habitats provided by the introduced Japanese seaweed Sargassum muticum. SCUBA observations conducted near the Island of Sylt during July 2006 showed that approximately every second S. muticum thallus was inhabited by E. aequoreus, whereas no pipefish could be found on sedimentary areas dominating the Wadden Sea. In a field experiment, we removed thalli from a S. muticum bed and transplanted them to an unvegetated site and to the donor S. muticum bed, respectively. Nine days after the transplantation, abundances of pipefish per thallus were almost equally high within all transplanted S. muticum units at vegetated and originally unvegetated sites. Abundances of E. aequoreus in transplanted thalli did not significantly differ from those found in unaffected control thalli located in the donor S. muticum bed. To explain high pipefish densities within S. muticum beds we sampled the zooplankton community inside and outside the S. muticum bed and compared it with gut contents of pipefish. Zooplankton densities were significantly higher inside the S. muticum bed. Harpacticoid copepods were the dominant group associated with S. muticum and also represented the major prey of E. aequoreus. We conclude that stocks of E. aequoreus are promoted by S. muticum beds since they benefit from higher food supply during the spawning season, probably in addition to increased shelter by habitat complexity. Results of the present study suggest that introductions of habitat-forming species such as S. muticum may cause beneficial effects on abundance and diversity of native species.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Since 1993, S. muticum can regularly be found near the Island of Sylt (Germany) in the northern Wadden Sea (Kornmann & Sahling 1994). In this area, S. muticum grows in the shallow subtidal zone at the particular tidal level where eelgrass Zostera marina occurred before stocks vanished.…”

Section: Introductionmentioning

confidence: 99%

Native pipefish Entelurus aequoreus are promoted by the introduced seaweed Sargassum muticum in the northern Wadden Sea, North Sea

Polte¹,

Buschbaum²

2008

Aquat. Biol.

View full text Add to dashboard Cite

show abstract

“…From there it spread continually and rapidly around the continent: in 1920, it occurred in Limfjorden, Denmark (Silva, 1957) and since then has colonized the Skagerrak, Kattegat and Danish North Sea coast (Christensen et aL, 1985). In 1930, Codium was discovered on Helgoland in Germany and since 1932 also occurs on artificial hard substrata off the island of Sylt (Kornmann & Sahling, 1994;Schories et al, 1997). First reports of Codium from Bohuslfin in Sweden date back to 1938 (Silva, 1957) and from Norway to 1952 (Silva, 1955).…”

Section: Invasion History (Wallentinus Unpublished Manuscript and Rmentioning

confidence: 99%

From introduced species to invader: what determines variation in the success ofCodium fragile ssp.tomentosoides (Chlorophyta) in the North Atlantic Ocean?

Chapman

1998

Helgolander Meeresunters

View full text Add to dashboard Cite

The green alga Codium fragile ssp. tomentosoides (Chlorophyta) has been introduced accidentally and successfully from Japan to many shores of the northern and southern hemispheres, including those of the Northeast and Northwest Atlantic Ocean. On most European coasts, Codium occurs regularly but at low abundances in the intertidal zone and is absent from subtidal habitats, tn contrast. Codium is extremely abundant in subtidal kelp beds in the Northwest Atlantic Ocean where it often reaches nuisance proportions. This differential success cannot be accounted for by either the properties of the invader or by physico-chemical differences between invaded coasts. A theoretical comparison between two regions on opposite sides of the Atlantic Ocean, i.e. Eastern Nova Scotia, Canada, and south central Britain, illustrates how the resident benthic community may determine the difference in relative abundance of Codium in subtidal habitats between northeast America and Europe. In this review, low floral species diversity, biological disturbance and facilitation by a previous species invasion are suggested as potential factors for the establishment, success and abundance of Codium in the Northwest Atlantic Ocean, but these require testing in field experiments. I N T R O D U C T I O N S t u d i e s of t h e e c o l o g y of s p e c i e s i n t r o d u c t i o n s into n o ve l m a r i n e e n v i r o n m e n t s h a v e o f t e n e m p h a s i z e d (1) t h e p r o p e r t i e s of s u c c e s s f u l l y i n v a d i n g species, (2) t h e c h a r a c t e ristics of f r e q u e n t l y i n v a d e d c o m m u n i t i e s or (3) t h e t r a n s p o r t v e c t o r s i n v o l v e d in overc o m i n g b a r r i e r s of space, c l i m a t e or h a b i t a t (e.g. C a r l t o n

show abstract

“…In 1980, the first attached specimens were found in the Dutch Wadden Sea on the island of Texel. Since 1988, S. muticum has been observed regularly on the German island of Helgoland, and since 1993 on the island of Sylt (Kornmann and Sahling 1994). Currently, S. muticum has an almost worldwide distribution.…”

Section: Introductionmentioning

confidence: 99%

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

2005

View full text Add to dashboard Cite

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.

show abstract

Marine algae of Helgoland: Second supplement

Cited by 33 publications

References 33 publications

Native pipefish Entelurus aequoreus are promoted by the introduced seaweed Sargassum muticum in the northern Wadden Sea, North Sea

Native pipefish Entelurus aequoreus are promoted by the introduced seaweed Sargassum muticum in the northern Wadden Sea, North Sea

From introduced species to invader: what determines variation in the success ofCodium fragile ssp.tomentosoides (Chlorophyta) in the North Atlantic Ocean?

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

Contact Info

Product

Resources

About