ecology interactions. types of ecological interactions competition predation parasitism mutualism...
TRANSCRIPT
ECOLOGY INTERACTIONS
Types of ecological interactions
competition
predation
parasitism
mutualism
commensalism
symbiosis
Competition – two species share a requirement for alimited resource reduces fitness of one or both species
Predation – one species feeds on another enhancesfitness of predator but reduces fitness of prey
herbivory is a form ofpredation
Parasitism – one species feeds on another enhancesfitness of parasite but reduces fitness of host
Mutualism – two species provide resources or servicesto each other enhances fitness of both species
Commensalism – one species receives a benefit fromanother species enhances fitness of one species; noeffect on fitness of the other species
Symbiosis – two species live together can includeparasitism, mutualism, and commensalism
Organizing ecological interactions
effect on species 1
effect onspecies 2
+ 0 -
+
0
-
mutualism
predationherbivoryparasitism
predationherbivoryparasitism
commensalism
commensalism
competition
competition
competition
VIDEO
• Elements of Biology: Ecosystems: Organisms and Their Environment• http://www.pbs.org/wnet/nature/lessons/symbiotic
-strategies/video-segments/1496/• Assignment: Ecological Interactions Quiz
13.2 RESEARCH QUESTIONS
1) Name two ways in which members of the same species interact.
2) In what ways do members of different species interact?
3) Think of a biological community near you, and give an example of how population has affected another.
4) Explain how symbiotic relationships are similar to and different from predator-prey interactions.