Exam 54: Populations

Individuals of a species that interact with one another within a given area at a particular time are known as a(n) _______.

Young rainbow trout were sampled at locations one kilometer apart along a river.Scale samples were taken from each trout, and trout age (0 or 1) determined by counting annual rings on the scales.In the first location, 92 trout were captured and marked.In the recapture one week later, 108 trout were captured; of these, 36 were marked.Using the mark-recapture equation, estimate the population size of young trout in this section of the river.

If 2,400 oak trees are counted in a 6 km × 2 km rectangular patch of land, the density of the oak trees is

When the per capita birth rate exceeds the per capita death rate within a population, the population size is

Some fish, such as guppies, use most of their energy to reproduce early in life; thus, adult guppies remain small and more vulnerable to predation.Other fish, such as bluegills, grow larger and have their first reproductive event later in life.One likely disadvantage bluegills will face by having their first reproduction later in life is that

If the birth rate is 0.05 and the death rate is 0.02, the per capita growth rate (r) in a population (assuming that there is no immigration or emigration) is

In the Trinidad guppy populations studied by Reznick and colleagues, the differences in life-history strategies between high-predation and low-predation sites resulted from changes in the population's _______.

Refer to the graph shown. The cactus finch has high mortality rates during the juvenile stage, an adult stage with low mortality rates, and an "old age" with high mortality rates.This life history would result in a survivorship curve that is

A population is at its carrying capacity (K) when the

If r = 1.0 for a given population, then the population is

Connections between patches or populations within a metapopulation are maintained by _______ among the populations.

The graph shows the history of human population growth.Approximately how long did it take the human population to reach a total of 1 billion? To go from 1 to 7.4 billion? Briefly explain the reasons for the rapid increase in population since the year 1825.

The way in which an organism partitions time and energy among growing, reproducing, and maintaining themselves is referred to as its

Nearly all mammals are iteroparous.This is probably because, in these larger, longer-lived animals,

Consider a population of bullfrogs in a small pond.Briefly describe how the population dynamics of the bullfrogs might be affected by the physical environment, by interactions with other members of the pond community, and by dispersal.

Which characteristic is typical of an r-strategist species?

In a goldfish population, the fitness of the population is greater (that is, survival rate is higher) when the school of goldfish is larger.This is evidence of a(n)

A population grows exponentially from a starting number of 100 individuals, with per capita monthly growth rate (r) equal to 0.2.What will be the sizes of the population at the end of each of the next three months?

For a fish species with a high reproductive capacity, the management strategy that would allow the highest harvest rate would be one that maintained the fish population

Species have differing life history strategies, based on the predictability of their environments.Organisms that reproduce only once during their life spans but have large numbers of offspring to ensure high population growth are called _______.