Hitchhiking bacteria can go against the flow

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Tiny aquatic organisms known as "water fleas" play an important role in carrying bacteria to lake and ocean habitats that are otherwise inaccessible due to stratified density boundaries. For animals as small as bacteria, the boundary between water masses of different temperature and salinity may as well be a brick wall. Hitching a ride on larger zooplankton helps them break through to greener pastures....
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