Euchloe tagis - Portuguese Bio-indicator
The Portuguese Dappled White is as rare butterfly species found in a very restricted area from Portugal to Italy and Morocco where it is to be found in limestone hills where the foodplants (Iberis spp.) are to be found.
The problem is that these areas are so restricted over its distribution range that the populations have developed in isolation and are no longer connected (being also different genetically) which poses serious conservation issues as these areas are extensivelly used for other practices (quarries for the exploration of marbles and dolomite; olive oil agriculture) and are prone to frequent wildfires because of general negligence.
THe butterfly is to be found when the scrubland has a certain development, when there are the suitable foodplants and nectar sources and under certain climatic conditions not going very far away from these habitats, hence it is considered a bio-indicator.
Together with E. tagis we can often find a very rich plant community which is too often rich in rare orchid species!