Department of Mathematics;
Ankara University;
Ankara;
Turkey;
Department of Mathematics;
Cankaya University;
Ankara;
Turkey;
Department of Mathematics;
Ondokuz Mays University;
Samsun;
Turkey;
Time Scales Calculus; Predator-Prey Dynamic Systems; Periodic Solutions; Coincidence Degree Theory; Beddington-DeAngelis Type Functional Response;