The 15 components of the site complement each other with different species composition, depending on variations in climate, geology, soil type and elevation. All components are functionally linked through the shared evolutionary history and most have ecological connectivity through an almost continuous forest belt in the Hyrcanian forest region. The exception is the coastal swamp forest Khoshk-e-Daran (component number 12), which has been isolated due to human settlements and agriculture, but it is the only represent of a very rare type of remnant ecosystem (IUCN, 2019).