( Niche ( ( refers ( to ( ( the way ) ( ( in which ) ( ( an organism ) ( fits ( into ( ( ( an ( ecological community ) ) or ) ecosystem ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Niche)) (VP (VBZ refers) (PP (TO to) (NP (NP (DT the) (NN way)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT an) (NN organism)) (VP (VBZ fits) (PP (IN into) (NP (NP (DT an) (JJ ecological) (NN community)) (CC or) (NP (NN ecosystem)))))))))) (. .)))
Niche refers to the way in which an organism fits into an ecological community or ecosystem.
(ROOT (S (NP (DT The) (NN term) (JJ ecological) (NN succession)) (VP (VBZ refers) (PP (TO to) (NP (NP (DT the) (NN sequence)) (PP (IN of) (NP (NN community) (CC and) (NN ecosystem) (NNS changes))))) (PP (IN after) (NP (DT a) (NN disturbance)))) (. .)))