>   Q: 2: If desert species can last a long time during "unhealthy" times, can fresh water and Marine species also estivate to bypass bad situations?

Some freshwater species can; others cannot.  Uniomerus species (which are freshwater mussels) seem able to live for at least two years on a shelf; or, in nature, in a dry creek bed for extended periods.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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