Specialists, Generalists, K & R Selected
A raccoon is an example of a generalist. Why?
He can survive off of a large variety of foods and can live in many different places.
A survivorship curve that shows a high percentage of survivors until old age represents a/an ___ selected species.
K- Selected
What kind of density (high or low) would you expect to see in a population at high risk of disease and high intraspecific competition?
High population density
What is total fertility rate?
Average # of children a woman bears in a given country throughout her lifetime.
Rule of 70. What is the doubling time of a population that is growing at 1.2%?
58.3 Years
A koala eats only eucalyptus. A koala is an example of a _________________.
Specialist Species
A survivorship curve with a sharp drop at the beginning of life represents a/an ____ selected species.
R-Selected
An elk pop. of 52 elk has 19 births and 6 deaths in a season, and 5 new elk immigrate to the herd and 0 elk emigrate from the herd. What is the new population size?
70
increase by 18
What does an age structure diagram that resembles a pyramid represent?
Population growth
In what stage of population growth is population stable or slowly increasing due to high CBR & CDR, no access to healthcare, and limited access to resources.
Stage 1- Pre-Industrialized
Dolphins raise their young for 6-8 years. Sometimes, their stay with their young for their entire life. Are dolphins an example of a K or R Selected species?
K-Selected. K for Care! ;)
In a realistic carrying capacity graph, when the population size goes over carrying capacity, this is called _____________.
overshoot
Disease runs through a population. This is an example of a density-dependent, or a density-independent factor?
Density DEPENDENT
What does an age structure diagram represent when the pre-reproductive age group is much smaller than the reproductive age group?
Population Decline
How can humans alter the human carrying capacity on Earth?
Technological Advancements: ex: introduction of synthetic fertilizer
A salmon can lay hundreds to thousands of eggs. Only 15% hatch and only 1% live to adulthood. Salmon are an example of K or R Selected species?
R-Selected
In Yellowstone National Park, the population of wolves was struck by a deadly virus. What happened to the moose population as a result? Why?
The population increased dramatically due to a lack of predators.
Give an example of a density INDEPENDENT factor that might affect a population.
Any natural disaster.
What factors would DECREASE total fertility rate in a country?
More access to healthcare & resources like food and clean water
More access to education and contraceptives for women
In what stage is there a rapid increase in population size due to a decrease in death rate as technology and healthcare advances.
Stage 2- Industrializing
An invasive species is more likely to be K or R Selected?
R-Selected (since they can thrive in a wide range of conditions)
Thoroughly explain "die-off" on a carrying capacity curve.
A population first experiences overshoot, and goes over carrying capacity. At this point, the environment does not have enough resources to support the oversized population and experiences a "die off" where many organisms die due to lack of resources like food, water, and shelter.
The maximum potential growth rate of a population with NO limiting factors is called _______________.
The pre-reproductive age group is the same as the reproductive age group. What does this say about the population?
It is stable.
What is the population growth rate of a population with CBR of 15 and a CDR of 12.
.3% increase