Combining biological and hydrogeological approaches: The grass Molinia arundinacea as a possible bioindicator of temporary perched aquifers in ophiolitic systems

•Ephemeral springs fed by perched aquifers identifiable only when discharge occurs.•Ecohydrogeological approach to detect them when no discharge occurs.•The grass Molinia arundinacea as an indicator of dry springs on ophiolites.•Area, cover and functional traits of Molinia related to the hydrologic gradient.