Download Patterns of Interaction

Relationships between organisms
in an ecosystem
 Competition
occurs when organisms
compete for limited resources, such as food,
water, light, or space.
 Competition can occur between organisms
of the same species (intraspecific) or
organisms of different species
(interspecific).
 Examples: two trees compete for light within
the forest (intraspecific); cheetahs and lions
compete for similar prey (interspecific)
 Video
clip-2:49
 http://www.ck12.org/lifescience/Competition-in-LifeScience/enrichment/AnemonesAttack/?referrer=concept_details
 An
organism, called a predator, feeds on
another living organism, known as prey.
 Predator-prey relationships are essential
for healthy ecosystems.
 Examples: a lion catches, kills, and eats a
zebra; a praying mantis catches and eats
a fly.
 Video
clip-2:06
 http://www.ck12.org/lifescience/Predation-in-LifeScience/enrichment/Dragonfly-LarvaHunts-Newt/?referrer=concept_details
A
symbiotic relationship in which both
organisms benefit from the interaction.
 Example: A clownfish provides protection
from predators for the sea anemone,
while the anemone's stinging tentacles
protect the clownfish from predators.
A
symbiotic relationship in which one
species receives a benefit, while the
other is unaffected.
 Example: Cattle egrets live near livestock
and eat the insects that are attracted to
the animals, while the livestock is
unaffected by the egrets.
A
symbiotic relationship in which the
parasitic species benefits, while the host
species is harmed.
 Example: A hookworm lives in the
intestines and lungs of a host organism
and causes them pain.
 Video
clip-5:17
 http://www.ck12.org/lifescience/Symbiosis-in-LifeScience/lecture/Symbiosis%3AMutualism-Commensalsim-andParasitism/?referrer=concept_details

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Harwood, J., & Wilkin, D., Ph.D. (n.d.). Competition.
Retrieved December 17, 2016, from
http://www.ck12.org/life-science/Competition-in-LifeScience/lesson/Competition-MSLS/?referrer=concept_details
Harwood, J., & Wilkin, D., Ph.D. (n.d.). Predation.
Retrieved December 17, 2016, from
http://www.ck12.org/life-science/Predation-in-LifeScience/lesson/Predation-MSLS/?referrer=concept_details
Harwood, J., & Wilkin, D., Ph.D. (n.d.). Symbiosis .
Retrieved December 17, 2016, from
http://www.ck12.org/life-science/Symbiosis-in-LifeScience/lesson/Symbiosis-MSLS/?referrer=concept_details