( ( associated ( ( ( aquatic species ) and ) ( aquatic systems ) ) ) . )
(ROOT (S (VP (VBN associated) (NP (NP (JJ aquatic) (NNS species)) (CC and) (NP (JJ aquatic) (NNS systems)))) (. .)))
associated aquatic species and aquatic systems.
(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)))) (. .)))