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Realized niche width
''Realized niche width'' is a phrase relating to ecology defining the actual space that an organism inhabits and the resources it can access as a result of limiting pressures from other species (e.g. superior competitors).
==Experiment==
The phenomenon was famously documented by ecologist Joseph Connell's study of species overlap between barnacles on intertidal rocks. He observed that Chthamalus stellatus and Balanus balanoides inhabited the upper and lower strata of intertidal rocks respectively, but only ''Chthamalus'' could survive both upper and lower strata without desiccation. If ''Balanus'' was removed from the lower strata, ''Chthamalus'' was able to occupy its fundamental niche (both upper and lower strata) which is much larger than its realized niche of upper strata. 〔(【引用サイトリンク】url=http://sky.scnu.edu.cn/life/class/ecology/chapter/Chapter13.htm )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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