Interactions
in
Ecosystems
Lesson 2
1
Do Now – What is Ecology?
DO Now: Matching
1.
2.
3.
4.
Abiotic Factor
Habitat
Biological Community
Niche
A. A tick on a cat
B. Rain
C. A sunflower is a
producer
D. Insects, slugs, and
earthworms under a
log
Essential Question:
What is symbiosis? What is predation?
Objective: SWBAT identify and describe
community interactions
Lesson Overview
AGENDA
 Finish Biological
Communities Lab
 What is Ecology Video
& Questions
 Discussion: Community
Interactions
HOMEWORK
 Principles of
Ecology Review
 Study for Quiz 1
of Unit 2
What is Ecology Wrap Up
• Lab
– Analyze soil and
water sample
– Record Data
– Show Mrs. Thomas
your pics.
– Clean Up
• Video and
Questions
– Watch Video
– Use information to
answer video
questions in your
notes.
copyright cmassengale
4
Predation
• Predation: One animal hunts
and kills another for food.
Predator limits the prey’s
population size.
– Predator : The hunter
• Unique adaptations to help capture
prey
http://www.naturia.per.sg/buloh/birds/Ardea_cinerea.htm
– Prey: The hunted
• Unique adaptations
to avoid being eaten
– Balance: Predator can’t
eat all of prey or food
will be gone for good.
http://www.colostate.edu/Depts/CoopExt/4DMG/Pests/spiders.htm
5
Lynx Chases Hare
6
Lynx and Hare Graph
7
Living Relationships:
Symbiosis
• Symbiosis: when organisms live
together and interact regularly with one
another
– 3 Types: Mutualism, Parasitism, and
Commensalism
Living Relationships:
Symbiosis
1. Mutualism: both species involved
benefit
– Ex. Ants and acacia trees, Egyptian
plovers and crocodiles
Living Relationships:
Symbiosis
2. Parasitism: one species benefits, the
other is harmed
– Ex. Tapeworms, ticks, guinea worms,
organism that causes malaria
– Parasitism and Disease: parasites limit the growth of a
population by causing diseases
Living Relationships:
Symbiosis
3. Commensalism: one species benefits,
the other is unaffected
– Ex. Barnacles and whales
Living Relationships:
Symbiosis
Symbiotic Relationship
Effect on Species
Mutualism
+
+
Parasitism
+
-
Commensalism
+
o
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