The coastal ecosystem is an indicator of the ecological integrity of the MANPRC. In total, 31 rare plant species are found in the coastal ecosystem of the MANCPR. Rare plants have been selected as a measure of the coastal ecosystem indicator. The objectives of the monitoring program are to detect changes over time in 1) the number of colonies of rare plants and 2) the abundance of focal species. To achieve these objectives, the MANPRC assesses the number of colonies for the following species: Taraxacum laurentianum, Pedicularis palustris, Erigeron lonchophyllus, Rosa blanda, Rosa acicularis. The abundance of Cirsium scariosum is assessed over time. The assessment of these species occurs every five years.