Habitat and biodiversity conservation

Recognizing that wilderness areas in cities are getting scarcer and neglected, the Biological Station Bonn Rhein-Erft conducted a city-wide project, in cooperation with the municipality of Bonn, funded by the Regional Rhineland Association, whose goal was to assess, map, evaluate and redevelop wilderness patches in Bonn. These contain roadside meadows, flower strips, hedges and small green patches growing on concrete walls or fences and pavement cracks. 10 of these "Wild corners" were designated as micro-wilderness areas, information signs were installed and an informative city walk conceptualized (1,4,10).

The Ville Forests covering the hills between Bonn and Cologne are an example of a rare and highly endangered forest habitat type in Europe giving a home for many threatened animal species (1). The protection and conservation of these 'oak-hornbeam forests on hydromorphic soils and the forest-dwelling species was the main objective of the Villewälder: LIFE+ Project for Kottenforst and Ville project which includes four Natura 2000 areas with 4.378 hectares of forest. The conservation measures of the project focused on water balance restoration, habitat improvement and preservation, and the extension and connection of protected areas (1,2).

The aim of Ljubljanica Connects funded by Life+ is to improve connectivity between Natura 2000 sites. Started in 2012, the project aims to remove barriers to fish migration, enhance and restore habitats, improve water management infrastructures, and put in place a water monitoring system. This will restore the river Ljubljanica's function as a corridor, improve water management and so provide better links between Natura 2000 sites. The fish species in question are Danube Roach, Danube Salmon and Striped Chub (2).

To promote bee-keeping, the city created the Bee Trail - a circuit where visitors can discover Ljubljana's beekeeping heritage and the significance of bees for our survival. The Bee Trail was designed and opened in 2015 as one of the activities within the Green Capital of Europe 2016 project. It was originally conceived only as an actual route between individual locations related to beekeeping and bees in Ljubljana. Through the participatory principle of working with individual members, however, it has been shown that the path is much more than just a work program or project. It has become synonymous with all activities related to bees and beekeeping in Ljubljana. Since 2011, the Slovenian Beekeepers' Association has awarded municipalities the title of the most bee-friendly municipality. The City of Ljubljana has been awarded the most bee-friendly municipality - in 2017 and 2019. (1)

"Grünes" C is an initiative of six municipalities (Alfter, Bonn, Bornheim, Niederkassel, Sankt Augustin and Troisdorf) to secure, connect and (re)develop open and recreational spaces (agricultural, cultivated, garden, commercial landscapes, protected nature areas, rivers, transport routes). The major objective is to create an accessible, united park landscape in the original area of the "Grünes C" which spans 37 square kilometres to preserve those landscapes facing urban pressure. This is envisioned through a set of interventions initiated in and around the participating municipalities. Bonn has three interventions that will be dealt with here (3,4,5,9)

The Venice Lagoon is characterised by intensive agriculture and by a web of drainage channels discharging into the rivers. The Veneto Region, through the “Plan for diffuse pollution prevention and restoration of water in the draining basins of the Venice Lagoon” financed measures of re-calibration of riverbeds aimed at the renaturation of the hydraulic web, to increase the time of permanence of water and phytodepuration processes in the draining basin. This case study, in particular, includes measures on the drainage channels discharging into the Dese river, one of the main water bodies of the Venice Lagoon basin. In particular, it aimed at re-structuring the effluents of the mid-course of the Dese river (Rio S. Martino, Rio S. Ambrogio and Scolo Desolino). (1).

The project LIFE SeResto (LIFE12 NAT/IT/000331) aimed to trigger a process of aquatic recolonisation in “Northern Lagoon of Venice”, mainly through the transplantation of "Zostera marina" and "Zostera noltei" to small sites distributed throughout the area. The proposed intervention technique involved transplanting a small number of plants, with advantages in terms of lower costs and impact on the donor sites (1).

The project opts for switching to more sustainable and organic ways of handling natural parks in the urban areas of the city of Bologna. The project was launched in 2008 and focused on 100 hectares, meaning 10 parks (out of the 1.100 total in the city). The goal is to develop maintenance techniques with low impact on local flora and fauna, stimulating biodiversity and an equilibrium with the surrounding urban environment, as well as the reduction of toxicity impacts for vulnerable residents (i.e. children and elderly people) (1 and 2).
This NBS solution focuses on changing maintenance of Bologna public urban parks from conventional techniques to biological ones (1 and 2).

The park will have a surface of 100.000 sqm. It is designed to be the beating heart between municipality offices, fashion and culture related buildings, vital train connections and residential areas. The paths generate a mosaic of irregular plots. Each with specific groups of plant species, grasses or lawn. Circular tree groupings are superimposed on these plots, and together they will form a botanic library. The vegetal patches alternate with water and hard materials, thus creating a series of public spaces that house cultural and recreational program (1).

On a yearly basis, the city of Zagreb, Zagrebački holding plants new trees and bushes to maintain Zagreb as a green city with 114 hectares of green spaces (Ref 2). Also includes maintenance of green surfaces, such as grass in public parks along with tram tracks and planting new trees and maintaining existing ones next to kindergartens and schools (Ref 2). Maintenance of city parks, lawns and tree lines includes cleaning, mowing and collecting grass and garbage from green areas, restoration of trampled lawns, maintenance and pruning of trees, shrubs and hedges, maintenance and care of seasonal and permanent flower beds, maintenance of paved and dune areas in parks and installation and maintenance of urban equipment in parks and children's playgrounds (Ref 1).