STRONA G£”WNA » Lecture - 5 (1st DDS program)

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Lecture - 5 (1st DDS program)


PREZENTATION (pdf - password)

BEHAVIOURAL ADAPTATIONS OF PARASITES
TO PARASITISM

A. What is the main aim of parasites?

to survive;
to produce many offspring stages (dispersive stages);
to complete the life cycle.

B. What is most important for the parasite strategy?

Place (where the parasite can find its host?);
Time (when the parasite can find its host?);
Host (how to overcome barriers of the host defence?):
a) ecological-etiological barriers;
b) metabolic-immune barriers.

C. How does the presence of a parasite alter host behaviour?

direct mechanisms:
host’s nervous system
... Toxoplasma gondii and

Dicrocoelium dendriticum (fluke)

1

Ligula intestinalis (tapeworm)

1

host’s muscle
... Trichinella sp.

indirect mechanisms:
by affecting host tissues other than neurons and muscles parasite has influence on host organism (for example on development, metabolism, immunity).
... Giardia intestinalis and the other intestinal parasites - the watery diarrhea that often accompanies Giardia infection can be seen as a host attempt to expel the parasite, or a dissemination that benefits the parasite;
... Echinococcus sp. (example with caribou and wolves);
... Enterobius vermicularis;
... Dipylidium caninum

It is a tapeworm; fleas are intermediate hosts - infected with the tapeworm fleas are slower at escaping and jump on shorter distances; therefore infected insects (fleas) can be easily caught by the dogs or cats and swallowed.

 Author: Piotr Nowosad date: 2020-03-18  print    back  
 
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