What two factors decrease the population size?

Which of the following are density dependent factors?

In 1976, the dominant finch on Daphne Major in the Galapagos Islands was the medium ground finch, with a population of 1,200. In 1977, a drought struck the island negatively affecting most of the vegetation. As a result, the population of medium ground finch dropped to 180 due to starvation. In 1983, however, a large amount of rainfall fell on the island creating optimal conditions for vegetation. The medium ground finch population increased to 1,100. After the rainfall of 1983, what type of population growth did the medium ground finch experience?

The black rhinoceros is a mammal found in Africa. Weighing in at up to 1,350 kg, these rhinos can live roughly 35 years. Gestation in the black rhino lasts for 15-16 months, with calves staying under the mother’s parental care for up to four years.

Black rhinos have been hunted extensively by humans for their horns. Poaching pressure has reduced the black rhino population to an endangered level. Ongoing efforts are attempting to save the animal from extinction.

How can the black rhino survivorship strategy be categorized?

A certain population of mice is growing exponentially. The growth rate of the population (r) is 2.0 and the current population size (N) is 2,500 individuals. How many mice are added to the population each year?

Researchers used the mark-recapture method to estimate the number of individuals in a population. Using the results presented in the table below, estimate the total number of individuals in the population. Give your answer to the nearest whole number.

If a population has a carrying capacity (K) of 1000, and the growth rate (r) is 1.02, what is the population growth when the population (N) is 600?

There is a population of 75 wolves in a forest that has a carrying capacity of 120. What is the maximum population growth rate if the population grows to 92 in one year?

Schuhlsville is an island of 5000 square miles off the coast of Jabooty.  There are currently 250,000 inhabitants of the island.  Last year, there were 12,000 new children born and 10,000 people were recorded as deceased.

What is the population growth rate (r)?

The country of Transylvania contains 2.3 million people (vampires not included) and covers 800,000 square miles.  In the year after the last census, there were 109,000 new children born and 111,000 people died.

What is the current population density?

Describe the life expectancy of this country

How would you describe the population of this country?

Select all that apply: Which of the following are abiotic factors?

In a forest, the carrying capacity for squirrels is about 100. If humans cut down part of the forest to build houses, what will happen to the carrying capacity for the squirrels?

Describes organisms with a high death rate (or low survivorship rate) immediately following birth. Examples include bacteria, fishes, and invertebrates.

One way to increase a population's size is to ...

Food, water, sunlight, shelter, and space are that keep populations from growing exponentially are called...

When a population grows past the ecosystem's carrying capacity, what happens to the population?

As N approaches K for a certain population, which of the following is predicted by the logistic equation?

Use the graph above to identify the exponential growth phase of a new population.