( ( In ( ( lakes and ) ( ( ( ( impoundments , ) and ) occasionally ) ( in streams ) ) ) ) ( , ( nitrogen ( ( may ( ( ( be ( the ( limiting nutrient ) ) ) and ) ( ( ( ( ( control ( ( the growth ) ( of ( algae ( and ( other ( aquatic plants ) ) ) ) ) ) ) , ) thus ) , ) ( ( ( using ( dissolved oxygen ) ) and ) ( blocking ( ( ( the penetration ) ( of sunlight ) ) ( which ( is ( needed ( for ( ( the growth ) ( of ( ( submerged ( aquatic vegetation ) ) ( -LRB- ( SAV -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ; ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NNS lakes)) (CC and) (NP (NP (NNS impoundments)) (, ,) (CC and) (ADVP (RB occasionally)) (PP (IN in) (NP (NNP streams)))))) (, ,) (NP (NN nitrogen)) (VP (MD may) (VP (VP (VB be) (NP (DT the) (JJ limiting) (NN nutrient))) (CC and) (VP (VB control) (NP (NP (DT the) (NN growth)) (PP (IN of) (NP (NN algae) (CC and) (JJ other) (JJ aquatic) (NNS plants)))) (, ,) (ADVP (RB thus)) (, ,) (S (VP (VP (VBG using) (NP (JJ dissolved) (NN oxygen))) (CC and) (VP (VBG blocking) (NP (NP (DT the) (NN penetration)) (PP (IN of) (NP (NN sunlight))) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN needed) (PP (IN for) (NP (NP (DT the) (NN growth)) (PP (IN of) (NP (NP (JJ submerged) (JJ aquatic) (NNS vegetation)) (PRN (-LRB- -LRB-) (NP (NNP SAV)) (-RRB- -RRB-))))))))))))))))) (: ;)))
In lakes and impoundments, and occasionally in streams, nitrogen may be the limiting nutrient and control the growth of algae and other aquatic plants, thus, using dissolved oxygen and blocking the penetration of sunlight which is needed for the growth of submerged aquatic vegetation (SAV);
(ROOT (S (PP (IN Besides) (NP (NP (NP (DT the) (NN concentration)) (PP (IN of) (NP (JJ dissolve) (NN oxygen)))) (CC and) (NP (NP (NNS nutrients)) (PP (IN in) (NP (DT the) (NN water)))))) (, ,) (NP (NP (DT the) (NN availability)) (PP (IN of) (NP (NN sunlight)))) (VP (VBZ limits) (NP (JJ aquatic) (NNS organisms))) (. .)))