Transcript Catalyst 8/15/2011

Catalyst 9/1/2011
1) What is the difference between logistic growth and exponential
growth?
• 2) What does carrying capacity on the graph mean?
• 3) What does 106 equal?
• HW:
1) Make sure your notebook is up-to-date! Notebook QUIZ on
Wednesday during our long block period.
2) Summarize Class Notes
3) Create Vocab Cards for New Vocabulary
Agenda 9/1/2011
• Catalyst (15 mins)
• Population Density and r vs. K selection (30 mins)
• r vs k selection posters + Presentation (40 mins)
• Unit 1 Quiz 1 (25 min)
• Grading Quiz 1 (10 min)
• Push/ Praise
The Walking Dead
• 1) The sheriff ran into a lot of trouble. What happened in
this scene?
• 2) The sheriff was advised to NOT go into the city when he
was in the suburbs. Why do you think that is?
• 3) Would the intrinsic rate of increase (r) be for zombies?
Defend your answer.
Bacteria
• 1) What is so special about bacteria? What is unique in this
video?
• 2) Why do bacteria have to multiply so much?
• 3) Compare the birthrate and deathrate of bacteria to
humans.
Two Demonstrations
• In your journals, answer the following questions:
• 1) Explain what happened during this demonstration. What
was the result?
• 2) Come up with at least three reasons why the two different
groups had different results
• 3) With your group, think of an example in nature or with
humans that this demonstration can apply to.
Population Density
• Some limiting factors of population are densitydependent. The level of population control depend on
how closely packed the population is.
• Examples: Predation, Parasitism, Disease, and
Competition for Resources.
Population Density
• Some limiting factors of population are densityINdependent. The level of population control has no
dependency on how close the population is to each
other.
• Examples: floods, fire, pollution, habitat destruction
r – selected vs K - selected
• r – selected organisms reproduce early and often in life.
They have a high-capacity for reproductive growth
• Little or no care is given to the offspring, but due to the
high number of offspring, enough of the offspring will
survive to enable the population to continue
• Examples: bacteria, insects, algae
r – selected vs K - selected
• K – selected organisms reproduce later in life, produce
fewer offspring and devote significant time and energy to the
nurturing of their offspring, It is important to preserve
offspring because so few are produce.
• Examples: humans, lions, elephants
Vocabulary HW
• Density Dependent
• Density Independent
• r-selected species
• K-selected species
Cockroach
r-Selected Species
Dandelion
Many small offspring
Little or no parental care and protection of offspring
Early reproductive age
Most offspring die before reaching reproductive age
Small adults
Adapted to unstable climate and environmental conditions
High population growth rate (r)
Population size fluctuates wildly above and below carrying
capacity (K)
Generalist niche
Low ability to compete
Early successional species
Fig. 8-10a, p. 168
K-Selected Species
Elephant
Saguaro
Fewer, larger offspring
High parental care and protection
of offspring
Later reproductive age
Most offspring survive to reproductive age
Larger adults
Adapted to stable climate and environmental conditions
Lower population growth rate (r)
Population size fairly stable and usually close to carrying
capacity (K)
Specialist niche
High ability to compete
Late successional species
Fig. 8-10b, p. 168
Independent Work
• Priority of individual work to be done:
• 1) Finish Vocabulary Sentence Starts
• 2) Finish Propaganda Poster by the End of the Day!
• 3) Start on Vocabulary HW