Report: “Zostera (seagras) Lower Saxony (1997)”
Description
After the disappearance of sublitoral seagrass meadows
at the beginning of the 1930s, since the 1970s,
also in the tide area of the Lower Saxony coast
Seaweed Zostera noltii and Zostera marina of
drastic declines affected. The extent of the
Losses were incurred in 1993 and 1994 (supplements 1995) with
a comprehensive mapping of the entire
the Lower Saxon mudflats are documented. In comparison with
previous stock surveys have been carried out by the former
extensive seaweed deposits only residual stocks
preserved. Since 1970, the total area has
reduced from about 35 km² to about 8 km². The
Main deposits are concentrated with 3.5 km² in the
The jadebush. Especially on the coasts of East Frisia and
Butjadingens and on the mudflats between Weser and
Elbes were lost large-scale seagrass meadows,
during the jadebuses and the polyhaline areas of
Weser and Emsmündung are less affected. The
Remaining stocks, in particular the Zostera marina
Occurrences are predominantly very thinned out. About
the causes of seagrass death still exist
Ambiguity. Signs of damage to sprouts and
Foliage was only occasionally observed. Some
Seagrass meadows are strong with macrophytic green algae
overgrown. A damage gradient can be
along the coast of relatively intact stocks in
Denmark and North Frisia on heavy losses in
Lower Saxony up to almost complete loss in the
the Dutch Wadden Sea. This
Distribution patterns indicate influences caused by nutrient and
Pollutant inputs. The seagrass may die as
A signal of serious environmental degradation in the
the Wadden Sea of Lower Saxony.
Resources
| Name |
Format |
Description |
Link |
Tags
- zostera-zostera-noltii-zostera-marina-vorkommen-nlwkn-seegrassterben-seegraswiesen-schadstoffeinträge