( ( These sites ) ( ( are ( threatened ( by ( ( ( ( ( altered ( water regime ) ) , ) ( exotic ( species invasion ) ) ) and ) grazing ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS sites)) (VP (VBP are) (VP (VBN threatened) (PP (IN by) (NP (NP (JJ altered) (NN water) (NN regime)) (, ,) (NP (JJ exotic) (NN species) (NN invasion)) (CC and) (NP (NN grazing)))))) (. .)))
These sites are threatened by altered water regime, exotic species invasion and grazing.
(ROOT (S (NP (JJ Exotic) (NNS species)) (VP (VBP are) (ADVP (RB also)) (VP (VBN called) (NP (JJ invasive) (NNS species)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP threaten) (NP (JJ other) (NNS species))))))) (. .)))