Lecture 13: Communities: Competition & coexistence Flashcards
define parasitiods
“internal predators” that must kill their
host to complete their lifecycle
define parasites
typically much smaller than their hosts and do not kill the host as part of their lifecycle (they “graze” the tissues of the host)
define ectoparasites
parasites that live on the outside of a living host
define endoparasites
parasites that live on the inside of their living host
define transmission mode
- how a parasite finds its host
- can be highly variable, and alters
the complexity of interactions
parasite transmission - horizontal transmission
- movement of the parasite between individuals that are not parent and offspring
- can occur between members of the same or
different species - close physical contact is needed
parasite transmission - Vertical transmission
movement of the parasite between host
parent and offspring.
parasite transmission - vector
an organism that facilitates horizontal transmission, typically without suffering severe symptoms
parasite transmission - Reservoir species
Species that can be infected with the parasite without any or severe symptoms, allowing the parasite to persist in a community outside of its primary host
Pathogen
A microbial parasite that causes disease in its host
how can the Lyme disease bacterial parasite be considered a pathogen
it causes some of its hosts to have a disease
what is a stable product of antagonistic pathogen-host coevolution
Selection tending to produce low pathogen virulence and high host resistance
Rabbits introduced into Australia exploded to a population size of _____
hundreds of millions
Myxoma virus had______ — an ______ between pathogen and host
- mild effects in its natural host
- evolutionary stable state in the arms race
define Kleptoparasitism
Direct theft of prey or other resources, resulting in a negative impact for the host
broad definition of parasitic interactions
involves the consumption of host resources, resulting in a negative impact on the host.
define Brood parasitism
Infiltration of host nests by the offspring of another species, exploiting parental care and resulting in a negative impact on the host and their offspring
define mutualism
Reciprocal adaptations in two or more species that benefit all species.
define symbiosis
- Any interaction where members of different species live in intimately connected interactions
- outcome of interaction can be highly variable.
Mutualisms are an ______ between species
evolutionary collaboration
what can mutualism often form between
consumer and resource species when both species offer services outside of consumer resource interaction and evolutionarily shift into a new category of species interaction
how may mutualisms be actively maintained
selection exerted by third party resource species or consumer species
define trophic mutualisms
Partners have complementary functions for obtaining energy and nutrients
The_______ between leaf-cutting ants and fungus is _______
- trophic mutualism
- attacked by parasitic fungus