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a vast region that has a combination of plant and animal species living in a distinct climate a group of individuals from the same species that live in the same area at the same time a group of individuals from different species that live in the same area at the same time a group of individuals that is able to breed and produce viable offspring
immigration rate birthrate death rate rates of food supply usage
The whooping crane population was reduced to 20 individuals in 1941, and had 39 individuals in 1950. Using this information and the graph, determine the r-value. [Hint]
r = 0.67 r = -0.067 r = 0.0 r = 0.067
In reality, it is not possible for population growth to continue indefinitely. Growth continues indefinitely because increases in the size of the population do not affect the growth rate. Exponential growth does not add an increased number of individuals as N gets larger. Exponential growth does not depend on the number of individuals in the population.
Forrester performed an experiment on the bridled goby that supported the density dependence hypothesis for coral reef fish species abundance. Looking at the graphs, what were his results? [Hint]
Adult gobies survive better when the density is high, and more juveniles immigrate when the density is low. Adult gobies survive better, and more juveniles immigrate when the population is high. Adult gobies survive better and more juveniles immigrate when the density is low. Adult gobies survive better when the density is low, and more juveniles immigrate when the density is high.
an oil spill. predation. food shortage. parasitic relationships.
pink salmon sea otters seabirds mussels
Looking at the graphs, what inference can you make? [Hint]
The developed nations have had long periods of no or very slow population growth. The developed nations will continue to have a high growth rate. The less-developed nations will be facing a crisis in the next 20 years when the majority of their population is over the retirement age of 65. The populations of the less-developed countries are not expected to grow quickly, because only modest numbers of individuals will be reaching reproductive age in the future.
Migration from nearby populations can reestablish populations. The overall population and number of individuals fluctuate. Subpopulations blink on and off with time. Over time, each population within the metapopulation is likely to be wiped out.
how many offspring are produced by females of different ages how many individuals of differing age groups immigrate and emigrate each generation the percentage of individuals from each age group that have a parasite the likelihood of individuals from each age group surviving to the following year
study the demographics of nonhuman populations predict the likelihood of a person dying at a given age predict the food needs of a population study the migration patterns of a population of gulls
Marked individuals are not allowed to mix with the unmarked population. Researchers sample appropriate habitats by counting the individuals that occur along transects. A second trapping effort is conducted, and the percentage of marked individuals is recorded.
The percentage of marked and recaptured individuals is equal to the percentage of marked individuals in the entire population. Individuals do not avoid traps after being caught once. Individuals do not emigrate after being trapped. The relationship between marked and unmarked individuals cannot be expressed algebraically.
A carp has a great deal of offspring, but predators eat a large number of them during the first year of life. Once they survive to maturity, there are few predators for them. Using this figure, if humans have a type I survivorship curve then what type of curve would a carp have and why? [Hint]
Type III, because carp have a low survivorship initially, but a high survivorship once they have matured. Type II, because carp have a high survivorship initially that declines at the end of their life. Type II, because carp have a steady survivorship throughout their life. Type III, because carp have a steady survivorship that increases with age.
The growth rate of a population is identical to the average number of female offspring that each female produces over the course of her lifetime. Age-specific fecundity has no effect on the net reproductive rate of a population. Biologists keep track of only females when calculating life-table data because only females produce offspring. It is necessary to take into consideration the survivorship of both sexes when determining the net reproductive rate.
What is the fecundity of the population? How many adults survive to each age class each year? How many juveniles will each adult age class produce each year over the course of several years? What are the survivorship curves of any predators in the new environment?
They have a low survivorship at all age classes, and rates of population growth are extremely sensitive to age-specific fecundity. They have low juvenile mortality rates, high adult mortality rates, and low fecundity. They have a high survivorship at all age classes, and rates of population growth are extremely sensitive to age-specific fecundity. They have high juvenile mortality, low adult mortality, and low fecundity.
basic demographic models for the species in question basic geographic structure of the habitat for the species in question the rate and severity of habitat disturbance the viability of the metapopulation
The population viability analysis does not consider migration. The demographic information is often lacking for endangered species. The population viability analysis gives a great deal of weight to the rate and severity of habitat disturbance. A population viability analysis makes assumptions for endangered species.
development of medicine development of agriculture improvements in hygiene development of industry
