Operational area 3: Freshwater zone in the lower Weser (Weser km 12 - 32) | ||||
Specifications for operational area 3 | Effect of measure 26 on conservation objectives | Short explanation | ||
positive effect | no effect | negative effect | ||
Conservation and development of specific estuarine habitats and (tidal) floodplains and their dynamic changes | ||||
Development, enlargement and upgrade of shallow water zones with moderate current climate | ++ | A shallow water zone with reduced tidal range was created. | ||
Development of passable shore structures | + | The passability of shore structures was improved by partly lowering a summer dike and by installing an in- and outlet structure principally passable for organisms. | ||
Conservation and development of typical habitats of operational area 3 (e.g. river flats, reeds and typical shore vegetation not being affected by neophytes, tidal floodplains and extensively used grasslands) in a dimension, spatial distribution and interconnection ensuring long-term appearance of typical species | ++ | Typical habitats of operational area 3 were developed (e.g. reeds, extensively used grassland). | ||
Conservation and development of tidal floodplains at the upper tidal border | ++ | The tidal habitat Vorder- and Hinterwerder takes over the functions of tidal floodplain back waters. | ||
Conservation and development of habitats for viable populations and estuary and (tidal) floodplain specific species as well as species after Annex II Habitats Directive and bird species after Birds Directive | ||||
Conservation of typical breeding bird communities and associated habitats (breeding birds of grasslands, reeds and tidal floodplains) | + | Reeds represent important breeding grounds for birds. | ||
Conservation and development of undisturbed resting and moulting areas for migratory bird populations (high diversity, many individuals) considering all necessary functions | + | Many resting birds were observed. | ||
Conservation and development of well-structured bordering waters and shore areas with wood, typical shore vegetation and reeds as hunting and feeding ground for Pond bat (Myotis dasycneme) | + | Pond bat was observed. | ||
Preservation and development of spawning ground function for Twaite shad (e.g. by avoiding disturbances during spawning season) | 0 | Spawning grounds of Twaite shad are situated downstream the project area. | ||
Conservation and development of spawning ground function for Smelt (Osmerus eperlanus) (e.g. by avoiding disturbances during spawning season) | 0 | Spawning ground of Smelt is situated upstream the project area. |
Specifications for entire investigation area of IBP Weser | Effect of measure 26 on conservation objectives? | ||
positive effect | no effect | negative effect | |
Conservation and development of specific functions and processes of estuaries and (tidal) floodplains to reach favourable abiotic conditions and typical hydromorphological structures | |||
Conservation and development of favourable water structures and water bed dynamics |
+ | ||
Development of evenly distributed and reduced current energy and tidal parameters |
+ | ||
Conservation and development of favourable gradients of specific aspects regarding estuaries and (tidal) floodplains (e.g. salinity, sediments, current conditions, tidal range, close-to-nature zonation of shore vegetation…); refers to inner estuary and to area between estuary and floodplain within fresh water zone. |
+ | ||
Improvement of water and sediment quality | 0 | ||
Conservation and development of specific estuarine habitats and (tidal) floodplains and their dynamic changes | |||
Conservation and development of habitats and communities which strongly depend on the natural dynamics of morphological processes (e.g. mudflats, shallow waters, creeks… ) |
++ | ||
Development of balanced area percentages regarding mudflats, shallow waters, shallow and deep sublitoral |
+ | ||
Conservation and development of tidal floodplains with typical vegetation structures and biocoenosis and favourable tidal and flooding dynamics; especially floodplain enlargement |
+ | ||
Conservation and development of habitats for viable populations and estuary and (tidal) floodplain specific species of Annex II Habitats Directive and bird species of Birds Directive | |||
Conservation of habitat functions for breeding and migrant birds especially as feeding grounds (also for bordering or networked areas) |
+ | ||
Conservation and development of habitat requirements for migratory fish stocks and cyclostomata within present territories and networked areas |
+ | ||
Conservation and development of habitat requirements for autochthon fish communities with typical age composition and typical percentage of estuarine species and diadromous migratory fish species |
+ | ||
Conservation and development of long-term viable populations of typical fish species and cyclostomata (estuarine and diadromous guilds) |
+ | ||
Reaching of favourable water quality for reproduction, larval development and viability of typical fish communities of different salinity zones |
+ | ||
Conservation and development / reestablishment of passability of the tidal river Weser and its tributaries for migratory fish and benthic invertebrates |
+ |