[[Íomhá:Lichenes rock Meneham ecological niches dscn1884.jpg|thumb|Dhá speiceas [[léicean]], léicean glas (ar chlé) agus léicean buí (ar dheis), atá in ann maireachtáil lena chéile ar charraig i dhá nideog éiceolaíoch éagsúil, a d'eascair as a bheith faoi lé coinníollacha nochta agus taise.]]
San [[éiceolaíocht]], is éard is '''nideog éiceolaíoch''' ann, ná téarma a úsaidtearúsáidtear chun cur síos a dhéanamh ar mhodh maireachtála [[speiceas|speicis]].<ref name=Pocheville2015>{{cite book | last= Pocheville | first= Arnaud | year= 2015 | title= [https://www.academia.edu/6188833/The_Ecological_Niche_History_and_Recent_Controversies The Ecological Niche: History and Recent Controversies], in Handbook of Evolutionary Thinking in the Sciences | chapterurl= https://www.academia.edu/6188833/The_Ecological_Niche_History_and_Recent_Controversies | editor1-last= Heams | editor1-first= Thomas | editor2-last= Huneman | editor2-first= Philippe | editor3-last= Lecointre | editor3-first= Guillaume |display-editors = 3 | editor4-last= Silberstein | editor4-first= Marc | location= Dordrecht | publisher= Springer | publication-date= 2015 | pages= 547–586 | isbn= 978-94-017-9014-7}}</ref>
Meastar go mbíonn nideog uathúil, ar leithligh, ag gach aon speiceas. Déantar cur síos sa nideoig éiceolaíoch ar
