Download • Relationship between two different species live closely together

Learning Objective
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Identify the specific roles organisms play in ecosystems.
Agenda
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Unit 2 Notes
Video: Predators
Homework
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Interactions Quiz Zero Hour
Bring supplies for Winogradsky setup
Unit 2 Reading assignment due 10/7 on Google
Classroom
• Relationship between two different species
live closely together
− Mutualism
− Commensalism
− Parasitism
• With your table partner, give a definition or an
example of the following ecological relationships:
a)
b)
c)
d)
e)
f)
g)
h)
i)
Ecological niche
Interspecific competition
Intraspecific competition
Competitive exclusion
Resource partitioning
Predation
Keystone species
Indicator species
Non-native (invasive) species
• In mutualism, two
species interact in
a way that benefits
both
− Nutrition and
protective
relationship
− Gut inhabitant
mutualism
− Not cooperation…
mutual exploitation
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• Commensalism is an
interaction that benefits
one species but has
little, if any, effect on the
other species.
− Epiphytes
− Birds nesting in trees
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Parasitism occurs when one species
feeds on part of another organism
One helped, one harmed
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Some parasites live in host
(microorganisms, tapeworms)
Some parasites live outside host (fleas,
ticks, mistletoe plants, sea lampreys)
Some have little contact with host
(dump-nesting birds like cowbirds, some
duck species)
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