The corridors are the weak link of the ecolological network.

The corridors fit in the ecological network which includes all the natural spaces that faune and flora need to live.

It implies the following elements:

• Reservoir or nodal areas: Natural area of quite good quality and large enough to provide a good functionality and allow thus all the species to ensure all of their vital functions
• Extended areas: Nodal areas of lower quality because of change which have reduced their quality or their size
• Core areas: Whole of the favourable area for the fulfilment of a cycle (place of reprodcution for example)
• The corridor: Space free of obstacle allowing the exchange between areas
• The continuum: Selected areas including complementary areas such as aquatic continuum made of river, marshes, wetlands,... or the forestry continuum made of forestry areas, grass lands or areas next to forest edges.

The ecological network includes all those areas, which all play a role and have to be accessible continuously, each season or occasionnaly depending on the species in order to ensure their survival.

The corridor helps to link all of those areas, it is the main tool and that's why it has to be protected.

• The larger, the richer, and less uninterrupted a corridor is, the more it will be used by a large range of species
• An efficient corridor will be really functionnal only if it is not excessively disturbed (light, traffic,...)
• The use of a corridor can be various when simple rules are applied and the equipment well designed

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