However, the considerable costs of introducing seed or plants of most species of conservation interest is justifiable on relatively small areas only, which might be considered as 'islands of biodiversity' enabling future dispersal, subject to appropriate grassland management.
(the considerable costs of introducing seed or plants of most species of conservation interest; is; justifiable on relatively small areas only)
the considerable costs of introducing seed or plants of most species of conservation interest
is
justifiable on relatively small areas only