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Submission + - Invasive species turn parasites into hosts (

ananyo writes: The arrival of an alien species can turn an ecosystem on its head. Researchers have found an invasive mussel that has caused a complete ecological role reversal, turning a host into a parasite and vice versa. In a new study (abstract, the team focused on ecosystems involving European bitterling (Rhodeus amarus) — small, pale-silver freshwater fish that lay their eggs in the gills of mussels. But an invasive Chinese mussel species, Anodonta woodiana, turns the tables on the would-be-parasite, ejecting bitterling eggs laid in them but colonizing the fish with its larvae.
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Invasive species turn parasites into hosts

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Understanding is always the understanding of a smaller problem in relation to a bigger problem. -- P.D. Ouspensky