Water courses of plain to montane levels with the Ranunculion flui-tantis and Callitricho-Batrachion vegetation (3260) and species Rhodeus amarus, Barbus barbus, Lutra lutra, Lampetra fluviatilis, Salmo salar
Watercourses of plain to montane zones with floating or submerged vegetation can be present in streams and rivers, backwaters with water through-flow, as well as near-natural drains. The structure of this habitat can be described as layered communities of mostly rooted plants. The habitat was assessed as having an unfavourable-bad condition in the period of 2007-2012. Pressures mainly stem from human-related impacts such as modification of water courses and pollution.
The same pressures affect key species of the habitat: the European Bitterling, the Barbel, the Eurasian Otter, River Lamprey and Atlantic Salmon. In Germany, measures including improvement and restoration of the water quality and the hydrological regime, as well as the establishment protected areas.
Positive effects of measures taken to improve the status of the habitat also enabled a growth in population of the associated species across Germany.
The main pressures and threats on water courses of plain to montane levels with Ranunculion fluitantis and Callitricho-Batrachion vegetation in Germany are subject to human-related changes to river structure and hydrology. These structural changes may include modification of riverbanks, river canalisation and weir/dam construction, and the intensive maintenance of river bank vegetation. In addition to structural pressures, pollution, shipping and urbanisation that result in thermal heating of water bodies and pollution of surface water, invasive alien species, leisure fishing and other water sports, grassland removal for arable land, forest replanting, intensive maintenance of public parks and cleaning of beaches, and reduction of habitat connectivity put stress on the habitat.
The species inhabiting the habitat are affected by similar pressures and threats, as the quality of water and surrounding habitat affects their survival and breeding. For example, the European Bitterling is negatively impacted by water pollution, weed clearing, and stocking of predatory fish. Pollution in central Europe has been the main pressure affecting the Barbel. The River Lamprey is negatively affected by water pollution as well as canalisation, migration barriers and dredging while the Atlantic Salmon is in addition affected by professional fishing, poaching, agricultural intensification, disposal of household and recreation waste as well as marine and freshwater aquaculture. Depletion of food sources force otters to scout new habitat and therefore to cross roads. Consequentially, over half of otter deaths in Saxony are the result of traffic.
The German Federal Agency for Nature conservation advocates that protection schemes for water courses plain to montane levels should cover the entire watercourse complex as well as large sections of the watershed. In 2017, the Federal Republic of Germany responded to potential gaps in achieving requirements of the Water Framework Directive by 2027 by implementing the federal program ‘Blaues Band’ (blue thread). The aim is to restore almost 3,000 km of rivers (of 7,800km total) that are not used for navigation anymore. The idea for this action is based on a preceding implementation of a biotope network ‘Grünes Band’ (green thread) that follows the historic border between East and West Germany.
Planned and implemented measures
In light of the second ‘flood of the century’ in the same century in 2013, a focus in Germany was set on the renaturation of alluvial plains where rivers had been restructured. The Federal Ministry for Environment, Nature Conservation and Nuclear Safety (BMU) states that good conditions for implementation of measures include ambitious stakeholders that fuel the project, enough available areas for renaturation, public participation, and reconciliation of the aims of water economy and nature protection, as well as synergies amongst stakeholders from different sectors. Such measures have been implemented on federal state and regional levels through regional development programs, as well as in communes through land-use plans and at project levels.
In Germany, measures that have been most effective for the habitat presented here include the protection and conservation of streams, including their hydrology, trophic level and natural meandering course along with unfortified river banks. Also, the removal of weirs / dams and any other transverse structures that hinder river flow is beneficial to the ecosystem and migratory fish. Since one of the main threats to the otter in Germany is traffic, passages have also been put in place at bridges and other barriers that enable the animals to move along the river without crossing roads.
The Blaues Band project is a cooperative initiative between the Federal Ministry for Environment, Nature Conservation and Nuclear Safety and the Federal Ministry of Transport, Building and Urban Development.
The LIFE+ Nature project ‘Optimisation of the Stream Valleys in the Arnsberg Forest’ (2009-2014) aimed to restructure the existing morphology back to a natural state and thus enhancing the ecosystem to benefit biodiversity. The project was organised by a local county working group, which collaborated with a regional nature conservation centre and a nature park. The forestry office and municipality were key participants within the project by allowing the measures to be carried out on their land, as well as contributing to their conception and implementation.
Another good example of successful stakeholder engagement is the LIFE project ‘Bachtäler Arnsberger Wald - Rehabilitation of the streams in the Arnsberger Wald’ (LIFE07 NAT/D/000214), which worked together with the Arnsberger Wald Nature Park to simultaneously build a sustainable nature conservation site as well as an attractive tourist location. The project additionally worked together with social institutions (international youth camps, agencies for long-term unemployed people) and engaged a high number of volunteers for project support with the help of local partners (BS Hochsauerlandkreis and ABU Soest).
Key achievements and impacts
Although information is lacking to quantify the impacts of the targeted measures (as described above), they have undoubtedly had a key role in maintaining or enhancing water courses with plain to montane levels and their associated key species. However, since many of the threats to the habitat are difficult to regulate, such as pollution through fertilisers, invasive species, and the continued intensive land use in areas surrounding the habitat, its conservation and improvement may prove difficult in the long-run.
The Eurasian Otter is a good example of the positive effect that conservation programs can have on a species, as the species’ conservation status in Germany has progressively been improving since the 1990s. For the European Bitterling and the Barbel, trends in range and population are increasing in Germany, where the restoration of water quality and the establishments of protected areas for the species have shown positive effects on the species’ conservation status.
Costs and financing
Key funding sources are not fully documented, but the LIFE Nature Programme has played an important role in species and habitat recovery. The Federal government also funds programs, taken forward by ministries or regional authorities.
The key targeted conservation measures that led to the improvements
- Returning watercourses of plain to montane levels to their natural state was the most successful conservation measure for the threatened habitat.
- Restoring and improving water quality by sufficiently reducing agri-environmental pressures was necessary to allow species to flourish within the watercourses in question.
- Restoring and improving the hydrological regime was an additional part of the successful improvement of conservation status.
Conservation measures that have not been sufficiently effective
- Agricultural pressures have not been sufficiently reduced in order to ensure a significant reduction of pressures on the presented habitat.
- Measures to halt the increase of invasive alien species in the habitat of the fish documented here have not yet been sufficiently implemented.
Factors that supported the conservation measures
- Local stakeholder engagement raised awareness of the vulnerability of the species and their habitat, and highlighted the need for conservation measures.
- The availability of funding that could be specifically targeted towards the species conservation needs, in particular the LIFE Nature programme action grants.
- The push for long-term conservation measures, such as returning habitats to their natural state, has been a vital step towards achieving their expected long-term sustainable improvement in conservation status.
Factors that constrained conservation measures
- Limitations on available funding for specific habitat and species conservation measures and available staff to support monitoring and enforcement patrols.
- A lack of effective and implemented species and habitat action plans, as well as LIFE projects that work together with local policy makers to implement management plans beyond the project’s life.
- Land use change pressures are continuously increasing, such as fertilisation and the spreading of invasive alien species, making it nearly impossible to reverse negative trends even with conservation measures in place.
Quick wins that could be applied elsewhere
- The creation of passageways under busy roads that are often crossed by Eurasian Otters.
- Enforcement of buffer zones of a minimum of 10m around the threatened habitat can help to avoid negative human interferences, and is less intrusive to the environment than returning water courses to their natural state, as well as less costly.
Examples of good practice, which could be applied to other habitats and species
- Programmes for renaturalising rivers, which also have a very positive effect on many other species within the habitat.
- The engagement of stakeholders from the tourist sector and interested members of the public can help fund the conservation of habitat and species, as well as educate people about the multilateral benefits of an intact environment.
- The evaluation of effective management measures by the nature authorities laid the groundwork for targeting issues involving threatened habitat and species and enabled regional and local stakeholders to invest in measures.
The information presented here is based on the work done as part of the European Commission study on identifying the drivers of successful implementation of the Birds and Habitats Directives (under contract ENV.F.1/FRA/2014/0063), carried out by the Institute for European Environmental Policy, BirdLife International, Deloitte, Denkstatt, Ecologic, ICF Consulting Services and PBL Netherlands Environmental Assessment Agency. The information and views set out in this case study are those of the authors and do not necessarily represent the official views of the Commission.
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