Why do we collect parasites? Pickled parasites in the vast collections of the U.S. Department of Agriculture, which are now managed by the Smithsonian. (Photo bottom left): Parasitic horsehair (Nematomorpha) (National Museum of Natural History/Anna Phillips)
Why do we collect parasites?
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Who would keep a collection of parasites?
 
Believe it or not, the United States government has been collecting parasites for a hundred years. The collection, recently acquired by the Smithsonian, now numbers more than 20 million parasites.
 
We keep parasites because they are a priority for research related to our well-being. 
Parasites cause many diseases. Endoparasites, which can live inside your body, include flatworms such as tapeworms or flukes, as well as tiny animals of various types that cause infections. Even parasites that live on the surface of your body (ectoparasites) may cause infections by giving rides to other organisms.  Ticks give rides to Lyme disease bacteria, which cause as many as 25,000 infections per year in the U.S. alone.
 
Ironically, parasites are also used for medical treatments. Thanks to natural anticoagulants in their spit, leeches can keep blood flowing into reattached body parts that have been severed in accidents.

However, the importance of parasites goes way beyond their roles in disease. Research on parasites has been led by medical concerns, but parasites are also players to be reckoned with in the ecosystems we depend on. Recent studies along the California coast and elsewhere have revealed that the biomass (weight) of all the parasites in an ecosystem may be higher than the biomass of all the top predators. While parasites tend to be small, there are lots and lots of them around!

By definition, a parasite lives in or on a "host," whether a plant, a mammal like a human, or other animals like crabs. Parasites take resources from their hosts without giving back. They usually don't kill their hosts, but like bad house guests, they may affect how their hosts behave. The close linkage they have with hosts makes parasites relevant for how entire ecosystems function and respond to change. Parasites are too prevalent to be ignored.
 
Learn about how scientists use museum collections to study the many associations between parasites and their hosts. Watch the live "Smithsonian Science How" webcast on Thursday, May 19, 2016, titled, "Living Together: Parasites and Hosts" (airs at 11 a.m. and 2 p.m. EDT on the Q?rius website). Parasitologist Dr. Anna Phillips will discuss and answer questions live from the National Museum of Natural History. Get teaching resources to use with the webcast.

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CRITICAL THINKING QUESTION
How can tiny parasites outweigh predators?
Write your answers in the comments section below


COMMENTS (11)
  • TehyaWhite-Ste
    5/17/2016 - 07:43 p.m.

    Parasites can outweigh predators because they take resources from the area and leave nothing for the big predators, leaving them to suffer.

  • phoebeh-ter
    5/20/2016 - 09:35 a.m.

    Because they can eat the predators food and basically leave nothing for the predators.

  • ShawnaWeiser-Ste
    5/23/2016 - 01:44 p.m.

    Parasites can possibly outweigh predators because they use a lot of the resources from the predators ultimately ending the predators.

  • izaacb-edg
    6/10/2016 - 03:37 p.m.

    there are millions of them all over the place.

  • alexb-edg
    6/10/2016 - 03:45 p.m.

    Parasites can possibly outweigh predators because they use a lot of the resources from the predators ultimately ending the predators.

  • gabrielp-edg
    6/10/2016 - 03:50 p.m.

    Parasites are not cool , I am not interesting

  • jadeng-edg
    6/10/2016 - 03:53 p.m.

    they can live in your body

  • moniqueh-edg
    6/10/2016 - 03:54 p.m.

    this are really gross and i don't really see how they help us as humans

  • julietr-edg
    6/10/2016 - 03:54 p.m.

    This is kind of scary to know they live inside our body and on the surface of our skin

  • martham-edg
    6/10/2016 - 04:12 p.m.

    This really is pretty interesting

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