Temperature, concentration of dissolved oxygen, pH, electrical conductivity, prokaryotic and viral abundance.

<p>The figure shows (A) temperature (°C) and the concentration of dissolved oxygen (mg L<sup><b>-1</b></sup>), (B) pH and electrical conductivity (μS cm<sup><b>-1</b></sup>), and (C) prokaryotic and viral abundance (both in N×10<sup><b>4</b></sup> mL<sup><b>-1</b></sup>) as measured in groundwater (GW) in July, August, October, and November as well as in surface water (SW) of the Danube River in November. Note that the x-axis for viral abundance (C) is divided into two scales due to the large differences between groundwater and surface water viral abundances.</p> <p>(PDF)</p>