Answer:

SERAL

AnswerCrossword Clue
SERALOf an ecological unit
SERALEcological adjective
SERALOf ecological communities
SERALOf the life cycle of an area, biogeographically.
SERALOf an ecological group.
SERALOf an ecological period
SERALRelating to ecological communities
SERALOf certain ecological areas
SERALPertaining to ecological communities
SERALOf ecological stages
SERALEcologically changing
SERALPertaining to ecological series
SERALOf a series of ecological communities
SERALOf an ecological succession
SERALOf the stages in an ecological succession
SERALPertaining to ecological stages