Speciation
Speciation
Which type of strategists would you expect to have low levels of prenatal care and a short life expectancy?
R strategists
Which of the following is NOT a density-dependent factor?
a. storms
b. disease
c. competition
d. predators
storms
Two species competing for the same resources cannot stably coexist if other ecological factors are constant is called _________ __________?
competitive exclusion
The Kaibab squirrel became its own species when a small population was isolated on the northern rim of the Grand Canyon. Which type of speciation is this?
geographic isolation
Long life expectancy usually correlates with all the following, except:
a. high levels of prenatal care
b. larger animals
c. type 1 & 2 survivorship curve
d. rapid reproduction
rapid reproduction
What causes a J curve to flatten into an S curve?
a. exponential growth is beginning
b. the death equals the birth rate
c. logistic growth is beginning
d. limiting factors affecting the popluation
limiting factors affecting the population
Give an example of an animal that is an R strategist.
Frogs, insects, birds, dandelion, jellyfish
20 different species of galagos, also known as bushbabies, are found in Africa. Even though various species of galagos share habitats, they cannot interbreed with one another because of their differently structured genitalia. Which type of speciation is this?
mechanical isolation
Limiting factors cause a population to level off at the ______________ _____________.
Carrying Capacity
Populations increase exponentially and can be graphed on a __________ curve.
J
Draw a J curve on the board
Give an example of a K strategists
Large mammals, humans, mature trees, elephants
True or False
individual species are well documented on a central registry
false
A population pyramid, or age structure diagram, shows a snapshot of the _________ __________.
current population
__________ ___________shows a pattern increasing in a constant amount.
Linear growth
Draw an example of linear growth on the board
What are the three survivorship curves based on ____________ ______________?
natality and mortality
Over-exploitation of animals is likely to cause:
A. speciation
B. interspecific competition
C. species extinction
D. behavioral isolation
C. species extinction
What are the three types of survivorship curves?
1. low fertility, high parental care
2. consistent mortality throughout life
3. high fertility, low parental care, high mortality
Draw each one on the board
___________ ___________ or geometric growth shows a pattern increasing at a constant rate.
Exponential growth
draw example on the board
When the limiting factors LIMIT the population, the J curve will not continue to _________. It levels off at the carrying capacity. This is called an ______ curve.
increase
S
Draw S curve on the board