( ( ( ( ( ( ( ( habitat loss ) , ) ( invasive species ) ) , ) pollution ) , ) and ) overharvesting )
(ROOT (FRAG (NP (NP (NN habitat) (NN loss)) (, ,) (NP (JJ invasive) (NNS species)) (, ,) (NP (NN pollution)) (, ,) (CC and) (NP (NN overharvesting)))))
habitat loss, invasive species, pollution, and overharvesting
(ROOT (S (NP (NNP Overharvesting)) (VP (VBZ is) (NP (DT a) (JJ serious) (NN threat)) (ADVP (RB particularly)) (PP (TO to) (NP (JJ aquatic) (NNS species)))) (. .)))