Populations

Animals such as pandas are long lived, mature slowly, and generally produce fewer offspring during their life spans but place a greater investment in each. What term is applied to this type of reproductive strategy?

• K-selected

• r-selected

Which contribute to a positive population growth?

• immigration

• positive birth rate

• emigration

• positive death rate

Which of the following is NOT an outcome of high population density?

• mortality increase

• predators tend to ignore prey that is overabundant

• reduction in births

• decreased resource availability

Which of the following describes the population of elephants in Kenya from 1973-1989?

• (immigration + births) – (emigration + deaths) = 0

• (immigration + births) – (emigration + deaths) = 1

• (immigration + births) – (emigration + deaths) < 0

• (immigration + births) – (emigration + deaths) > 0

A population’s emigration in one month totaled 2 individuals. During the same period, immigration was 12 individuals. Natality (births) was 8, and mortality was 15 due to a parasite infection. What was the net effect on the population size?

• +5

• +3

• 0

• -4

What type of factor has an increasing impact as the population size increases?

• density-independent

• density-dependent

• cohort effect

• survivorship factor

Which of the following are density dependent factors?

• competition for resources

• predation

• disease

• natural disasters

Which of the following are examples of a density independent factors?

• forest fire

• seasonal cycles

• storms

• disease

Factors like predation can have a positive benefit to the population of prey organisms because predators tend to keep prey populations below their ___________.

• carrying capacity

• sustainibility number

• exponential growth point

• competition level

As a population of a species increases within a territory, which of the following most likely also increases?

• Immigration

• Food supply

• Carrying capacity

• Competition