Sect 2.17-2.20 Flashcard

Front

What is the predicted size of the human population by the year 2050?

Back

At least 9.5 billion people.

Front

What type of factors do not rely on the size of the population to affect population numbers?

Back

Density independent factors.

Front

Which species live in unstable environments where things change often?

Back

r selected species.

Front

What is the first stage of human population growth?

Back

Birth and Death rates are high and population growth is stable.

Front

Which species display a type 1 survivorship curve?

Back

k selected species.

Front

Define 'density dependent factors'.

Back

Factors that rely on the size of the population to affect population numbers.

Front

Define 'density independent factors'.

Back

Factors that affect population numbers regardless of the population size.

Front

What is a type 1 survivorship curve?

Back

A curve where most individuals survive to old age, typical of k selected species.

Front

What is a type 3 survivorship curve?

Back

A curve where many offspring are produced, but few survive to adulthood, typical of r selected species.

Front

What are 'k selected species'?

Back

Species that produce fewer offspring but invest more resources in their upbringing.