Wiesbaden has a large number of high-quality biotope areas, both in the open countryside and within the settlement, which provide a habitat for numerous animal and plant species. Some of these areas are already well connected. In other parts of the urban area, the individual biotope areas are separated from each other by dense development or highways - for example in the Bierstadt field.

As it is necessary to connect the various special habitats in order to preserve and exchange species, a biotope network plan has been drawn up by the city's environmental department. On the one hand, this should ensure that the important areas are clearly recognizable, and on the other hand, structurally rich connections between the individual valuable areas should be maintained or developed. The network corridors enable the exchange of animal and plant species. In addition, the barriers that cannot be easily overcome are identified.

Biotope networking is enshrined in the Federal Nature Conservation Act, where it is formulated as an objective. The network of biotopes is intended to ensure the survival of certain animal and plant species. A biotope network is successful if it succeeds in maintaining and developing a functional relationship between habitats so that the areas between similar biotopes can be crossed by individual animal and plant species.

This plan is a basis for updating the landscape plan at land use plan level. It is drawn up at an overview scale of 1 : 25,000. Networking is based on the biotope categories - floodplains, cultural landscape, green spaces in inner areas, dry sites, forest.