Populations of threatened plants must be periodically monitored in the field. Such monitoring may identify early population decreases or environmental degradations, allowing a rapid and adequate intervention to address the issue. This monitoring is particularly important when conservation projects for threatened species are implemented. Otherwise, it is impossible to evaluate the impact of undertaken activities and to adapt them as necessary.

Groups of experts, supported by volunteers, currently organize a monitoring of threatened species in several cantons. Methods are chosen in accordance to the species, habitat, responsible person and to financial resources. According to the needs, the expert in charge decides for either a full scientific monitoring or for a reduced programme with volunteers which considers only a few essential data. The scientific monitoring aims at identifying the grounds for structural population changes using statistical analysis of the data; knowledge on the biology of the species, as well as on the efficiency of the protection measures are also improved. Limited programmes on the other hand allow to monitor more species and localities, leading to a quicker field intervention. However, a good coordination at national level is essential, whichever method is chosen.

The CPS has completed several studies in relation to the monitoring:
A concept for a standardized monitoring of threatened species, based on publications and interviews of experts, has been prepared by C. Käsermann.
This concept was field tested by Verena Doppler. She then developed a simplified monitoring methodology in collaboration with volunteers.

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