Systematics and ecology of the Isefjord marine fauna (Denmark)

Rasmussen, Erik Michael

doi:10.1080/00785326.1973.10430115

Cited by 637 publications

(326 citation statements)

References 133 publications

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303

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“…to decreased transparency in the water column (Livingston, 1984;Ort & Moore, 1984), and to massive epiphytal growth as a response to nutrient enrichment (Neverauskas, 1987;Silberstein et al, 1986). A coincidence of warm summers and mild winters with declines in Z. marina was pointed out by Rasmussen (1973). Hartog (1970Hartog ( , 1985 suggested that frost, grazing, and self-induced sedimentation cause pluriannual cycles in intertidal seagrass beds.…”

Section: Marinamentioning

confidence: 99%

Historical changes in the benthos of the Wadden Sea around the island of Sylt in the North Sea

Reise¹,

Herre²,

Sturm³

1989

Helgolander Meeresunters

132

117

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The situation regarding the distribution and abundance of seagrass, macroalgae and benthic fauna near the island of Sylt in the south-eastern North Sea during the period 1923 to 1940 is compared with that of the 1980s. Evidence of organic enrichment in recent times is provided by (1) massive growth of green algal mats on sheltered tidal flats, (2) a decline of red algae in the subtidal zone, (3) an expansion of mussel beds along low water line and down to 20 m depth, (4) increased abundance of polychaetes inhabiting intertidal and subtidal sandy bottoms. Seagrass beds have undergone complex changes which remain unexplained. Intensified erosion has contributed to the loss of habitats in the intertidal zone, and probably affected sessile epifauna in the deep channels. Here, direct removal and disturbance by the bottom-trawling fishery may also have contributed to the observed species impoverishment.

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Section: Marinamentioning

confidence: 99%

Historical changes in the benthos of the Wadden Sea around the island of Sylt in the North Sea

Reise¹,

Herre²,

Sturm³

1989

Helgolander Meeresunters

132

117

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“…Other species of the genus have been shown to be detritus feeders (Gable & Croker, 1977;Harrison, 1977;Kostalos & Seymour, 1976). Rasmussen (1973) mentioned Anaitides mucosa as an important predator on many small invertebrates. This is confirmed with the specification that permanent meiofauna is not included.…”

Section: K Reisementioning

confidence: 99%

Moderate predation on meiofauna by the macrobenthos of the Wadden Sea

Reise

1979

Helgolander Wiss. Meeresunters

110

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The role of meiofauna in the trophic web of marine ecosystems is a controversial topic. During an experimental study on tidal flats in the eastern part of the North Sea, potential predators on meiofauna were kept in enclosures. A gobiid fish, shrimp, crabs, an amphipod, four polychaete worms and a nemertine were tested for their ability to decimate nematodes, turbellarians, ostracods and benthic copepods. Only few macrobenthic species preyed heavily on permanent meiofauna: juveniles of the shore crab Carcinus rnaenas, the hermit crab Pagurus bernhardus with the colonial hydrozoan Hydractinia echinata on its shells, and the rag worm Nereis diversicolor. When benthic infauna was protected from these predators with exclosures, juvenile macrofauna responded with a marked increase in number, while the permanent meiofauna remained unaltered except for a limited increase in nematodes. It is concluded that in the Wadden Sea abundance of permanent meiofauna (Nematoda, Turbellaria, Ostracoda, Copepoda) is only locally or temporarily regulated by macrobenthic predators.

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“…Eine einmalige Laichsaison scheint allgemein in der Ostsee zu gelten, denn Rasmussen (1973) fand an der d~nischen Ostseekfiste fibereinstimmend mit unseren Befunden nur eine Brutzeit von Mai bis Juli. Die meisten trachtigen Weibchen wurden im Juni gefunden.…”

Section: Zusammensetzung Verteilung Und Ver~nderung Der Population Junclassified

“…Dies gilt nicht nut fi~ die Nordsee (Broekhuysen, 1937), sondern auch ffir die Ostsee (Rasmussen, 1973;Thorson, 1946). Fiir die Schlei konnten wir kein ausgepr~gtes Wanderverhalten der tr~chtigen Weibchen feststellen.…”

Section: Zusammensetzung Verteilung Und Ver~nderung Der Population Junclassified