Seasonal dynamics and diversity of Antarctic marine viruses reveal a novel viral seascape.

The Southern Ocean microbial ecosystem, with its pronounced seasonal shifts, is vulnerable to the impacts of climate change. Since viruses are key modulators of microbial abundance, diversity, and evolution, we need a better understanding of the effects of seasonality on the viruses in this region. Our comprehensive exploration of DNA viral diversity in the Southern Ocean reveals a unique and largely uncharted viral landscape, of which 75% was previously unidentified in other oceanic areas.

Influence of Irradiance and Temperature on the Virus MpoV-45T Infecting the Arctic Picophytoplankter .

Arctic marine ecosystems are currently undergoing rapid changes in temperature and light availability. Picophytoplankton, such as , are predicted to benefit from such changes. However, little is known about how these environmental changes affect the viruses that exert a strong mortality pressure on these small but omnipresent algae.