( This ( ( is ( ( ( ( an issue ) ( for ( ( anadromous ( -LRB- ( ( migrating ( from ( ( fresh ( to salt ) ) water ) ) ) -RRB- ) ) ) ( ( ( fishes ( such ( as ( certain ( ( ( threatened and ) endangered ) salmonids ) ) ) ) ) , ) ( which ( may ( ( avoid streams ) ( with ( low ( metal concentrations ) ) ) ) ) ) ) ) ) ) , ) ( ( resulting ( in ( ( the elimination ) ( of ( that species ) ) ) ) ) ( from ( the watershed ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT an) (NN issue)) (PP (IN for) (NP (NP (NNS anadromous)) (PRN (-LRB- -LRB-) (VP (VBG migrating) (PP (IN from) (NP (ADJP (JJ fresh) (PP (TO to) (NP (NN salt)))) (NN water)))) (-RRB- -RRB-)) (NP (NP (NNS fishes)) (PP (JJ such) (IN as) (NP (JJ certain) (ADJP (JJ threatened) (CC and) (VBN endangered)) (NNS salmonids))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB avoid) (NP (NNS streams)) (PP (IN with) (NP (JJ low) (NN metal) (NNS concentrations)))))))))) (, ,) (VP (VBG resulting) (PP (IN in) (NP (NP (DT the) (NN elimination)) (PP (IN of) (NP (DT that) (NN species))))) (PP (IN from) (NP (DT the) (NN watershed)))))) (. .)))
This is an issue for anadromous (migrating from fresh to salt water) fishes such as certain threatened and endangered salmonids, which may avoid streams with low metal concentrations, resulting in the elimination of that species from the watershed.
(ROOT (S (NP (JJ Fresh) (NN water) (NNS biomes)) (VP (VBP are) (VP (VBN defined) (PP (IN by) (NP (JJ low) (NN salt) (NN concentration))))) (. .)))