AT THE DEPARTMENT OF BIOLOGY, SCHOOL OF SCIENCES, CENTRAL UNIVERSITY OF VENEZUELA, CARACAS, VENEZUELA

AT THE DIVISION OF BIOLOGICAL SCIENCES, DEPARTMENT OF ENVIRONMENTAL SCIENCES, UNIVERSITY SIMÓN BOLÍVAR, CARACAS, VENEZUELA

AT THE CENTER OF GRADUATE STUDIES OF THE VENEZUELAN INSTITUTE FOR SCIENTIFIC RESEARCH (IVIC)

AT THE DEPARTMENT OF BIOLOGICAL SCIENCES, SCHOOL OF EXACT AND NATURAL SCIENCES, UNIVERSITY OF BUENOS AIRES

AT THE DEPARTMENT OF ECONOMY OF SAINT ANDREWS UNIVERSITY (Argentina)