( ( The ( Lotka-Volterra model ) ) ( ( ( incorporates ( interspecific competition ) ) ( by ( using ( ( a parameter ) ( called alpha ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ Lotka-Volterra) (NN model)) (VP (VBZ incorporates) (NP (JJ interspecific) (NN competition)) (PP (IN by) (S (VP (VBG using) (NP (NP (DT a) (NN parameter)) (VP (VBN called) (S (ADJP (NN alpha))))))))) (. .)))
The Lotka-Volterra model incorporates interspecific competition by using a parameter called alpha.
(ROOT (S (NP (NP (DT The) (CD two) (JJ basic) (NNS types)) (PP (IN of) (NP (NN competition)))) (VP (VBP are) (VP (VBN called) (NP (ADJP (JJ instraspecifc) (CC and) (JJ interspecific)) (NN competition)))) (. .)))