( ( ( ( ( ( ( Water levels ) ( in ( ( rivers and ) lakes ) ) ) ( are low ) ) , ) and ) ( ( threats ( to ( ( endangered ( aquatic species ) ) ( like ( ( salmon and ) steelhead ) ) ) ) ) ( are serious ) ) ) . )
(ROOT (S (S (NP (NP (NNP Water) (NNS levels)) (PP (IN in) (NP (NNS rivers) (CC and) (NNS lakes)))) (VP (VBP are) (ADJP (JJ low)))) (, ,) (CC and) (S (NP (NP (NNS threats)) (PP (TO to) (NP (NP (JJ endangered) (JJ aquatic) (NNS species)) (PP (IN like) (NP (NN salmon) (CC and) (NN steelhead)))))) (VP (VBP are) (ADJP (JJ serious)))) (. .)))
Water levels in rivers and lakes are low, and threats to endangered aquatic species like salmon and steelhead are serious.
(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)))) (. .)))