The first of these will be this Wednesday at noon in the MSI auditorium (ground floor of the MSI building) by Dr. Ian Hewson of Cornell University with the title:
Foe or friend? New
perspectives on aquatic viral diversity and roles in host ecology enabled by
community genomics
Viruses in aquatic ecosystems play crucial roles in
microbial food webs, where they influence the abundance, productivity, and
diversity of hosts. While most viruses are believed to infect bacteria, they
may also infect other organisms, from other viruses to whales. Despite a growing appreciation for their
impacts on bacterio- and phytoplankton, there is little information on the
diversity and activities of viruses arising from allochthonous sources, or
those associated with aquatic metazoa. The
origin, decay and infectivity of allochthonous viruses was investigated in
aquatic habitats. These studies have revealed that viruses move and infect hosts
across biomes, and that their decay rates are similar to viruses originating
from native hosts. Investigations of
viruses associated with sea fans, marine copepods and freshwater cladocerans
have shown that viruses are widespread in aquatic metazoa, and that they may
influence host population dynamics. The wide diversity of viruses in plankton
and associated with metazoa in the absence of apparent disease raises
interesting questions about the role of viruses in host ecology. Moreover,
these studies have provided new perspective on the ecological significance of
viruses in aquatic ecosystems.
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