“…of potential hosts, as well as transformations inflicted on the organic substances that serve as substrates for some of these microorganisms (Visser et al, 1999;Fernández-Zenoff et al, 2006;Ruiz-González et al, 2013). Certain studies suggest that the degree of infectivity and phage production tends to decrease with the increasing of exposure time and the received amount of UV-B radiation (Jeffrey et al, 1996;Noble & Fuhrman, 1997;Weinbauer et al, 1997;Wilhelm et al, 1998Wilhelm et al, , 2003Cheng et al, 2007). For the study area, a time series of monthly average solar radiation from 1960 to 1999 indicates that higher average levels occur commonly between January and March (548-607 cal cm -2 ; CAR, 2005).…”