(S (S (NP (BASENP (DT A) (JJ dry) (NNP Winter)) (CC and) (BASENP (JJ resulting) (JJ low) (NN ground) (NN water) (NNS levels))) (VP (VBD threatened) (NP (BASENP (NN duck) (NN nesting) (NNS grounds)) (PP (IN in) (BASENP (DT the) (NN area)))))) (PERIOD .))