In contrast , the microbiota seems to have a negative effect on lifespan in old Drosophila melanogaster .
Their removal in ageing flies increases longevity. Old flies have a reduced ability to fight infections and this may also relate to the bacterial members of the microbiota .
In contrast , the microbiota seems to have a negative effect on lifespan in old Drosophila melanogaster , because their removal in ageing flies increases longevity. Old flies have a reduced ability to fight infections and this may also relate to the bacterial members of the microbiota .