UNIT 1.2 Flashcards
association between two different organisms living in close physical association usually to the advantage of both as opposed to free living organisms and simply, living together.
symbiosis
Any organism that is intimately associated with another organism of a different species is considered to be a
symbiont
relationshicleen two symbionts which are merely traveling together and without physiological or biochemical dependence on each other.
phoresis
relationship involving symbionts that are mutually dependant on each for food and shelter. This relationship is usually obligatory and one symbiont cannot survive without the other,
mutualism
a type of relationship, in which one symbiont derives benefit from the other symbiont (host) but the host is neither benefited nor harmed.
commensalism
the relationship between predators and prey where the predators kill the prey for food.
predatorism
are those whose immature stages develop on other parasites and emerge by killing by the parasite
parasitoids
Different Kinds of Hosts
definitive
intermediate
paratenic
reservoir
natural
accidental
carrier
intercalary
a host that harbors a parasite in the adult stage or where the parasite undergoes a sexual method of reproduction
definitive host
harbors the larval stages of the parasite or an asexual cycle of development takes place.
intermediate host
a host that serves as a temporary refuge and vehicle for reaching an obligatory host, usually the definitive host
paratenic host
a host that makes the parasite available for the transmission to another host and is usually not affected by the infection.
reservoir host
a host that is naturally infected with certain species of parasite.
natural host
a host that is under normal circumstances not infected with the parasite.
Accidental host -
are hosts that have a residual population of the parasite and acts as a source of infection for the same type of host.
carrier host
a host that liberates the infective stages of a parasite of another trapped in the body of the original host
intercalary host
an arthropod that carries the parasite between two vertebrate hosts.
vector
Vector may be divided into
mechanical vector and cyclical vector.
an arthropod that carries the infectious agent from, one vertebrate host to another without any development in its body.
mechanical vector
a vector in which the parasite undergoes development/multiplication before being transmitted to the next host
cyclical vector
