Unit 1: DLM 2

To measure the population of lake trout in a 250-hectare lake, 400 individual trout were netted and marked with a fin clip, then returned to the lake. The next week, the lake was netted again, and out of the 200 lake trout that were caught, 50 had fin clips. Using the mark-recapture estimate, the lake trout population size could be closest to which of the following?

1600

A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Calculate an estimate of the total number of individuals added to (or lost from) a population of 1000 individuals in one year.

40

A population's carrying capacity A) may change as environmental conditions change. B) can be accurately calculated using the logistic growth model. C) generally remains constant over time. D) increases as the per capita growth rate (r) decreases. E) can never be exceeded.

A) may change as enmvirnemtnal condition change

What is the difference between logistic and exponential growth model predictions when population numbers become high?

Both models are the same at low population densities, but when densities are high, the growth is reduced or stopped in the logistic model, whereas growth continues in the exponential model regardless of population density.

White-tailed deer were quite rare across the northeastern United States approximately 100 years ago, but now their populations are generally considered to be too high. What do you predict has caused this?

Hunting females was prevented, and the intrinsic fecundity rate is actually quite high.

Experiments performed on the bridled goby in coral reefs and on song sparrows on Mandarte Island support the hypothesis that density-dependent effects can cause logistic population growth. What conclusions can be drawn from logistic growth models?

Individuals survive better and clutch size increases when the population density is low.

During the Zootoca vivipara study, researchers monitored individuals on a daily basis to document the number of young produced by each female in the wild. What would be the best way to obtain the same type of data but not have to visit the site every day?

Install cameras on-site to monitor lizard activity.

What is the trade-off between life expectancy and fecundity?

Investing more resources in reproduction means there are fewer resources available for survival.

Which of the following statements is true about the metapopulation model?

Migration from nearby populations can reestablish populations

Why can metapopulations remain stable over time even if some subpopulations go extinct?

Migration from other subpopulations can reestablish formerly extinct subpopulations.

How can human population size keep increasing in spite of decreased fertility rates? See Section 51.5 (Page 1085) .

Population size will continue to increase as long as the average fertility is above the replacement rate.

Species with which life history traits are most likely to be endangered by human alterations?

Species with high juvenile mortality, low adult mortality, and low fecundity

What are the implications of the fact that the hare population increases most when food is high and predators are excluded?

The hare population is controlled by both food supply and the lynx population.

Consider the endosymbiosis theory for the origin of the mitochondrion. How did each endosymbiotic partner benefit from the relationship? 1) The host cell provided a protected environment for the endosymbiont; the endosymbiont provided the host with oxygen for respiration. 2) The host cell provided a protected environment and carbon compounds for the endosymbiont; the endosymbiont provided increased ATP from the carbon compounds. 3)The host cell provided carbon compounds for the endosymbiont; the endosymbiont made them polymerizated. 4)The host cell provided a protected environment for the endosymbiont; the endosymbiont provided carbon compoun

The host cell provided a protected environment and carbon compounds for the endosymbiont; the endosymbiont provided increased ATP from the carbon compounds.

What is the logic behind the calculation of the net reproductive rate?

The proportion of mothers alive multiplied by the average number of offspring for each age class summed to provide an estimate of population growth

A carp has a large number of offspring, but predators eat many of them during the first year of life. Once they survive to maturity, they have few predators. What type of survivorship curve does a carp have and why?

Type III, because carp have a low survivorship initially but a high survivorship once they have matured

Which population would be most likely to experience exponential growth?

a young population with few individuals

Which of the following assumptions have to be made regarding a mark-recapture estimate of population size? 1) Marked and unmarked individuals have the same probability of being trapped. 2)The marked individuals have thoroughly mixed with the population after being marked. 3) No individuals have entered or left the population by immigration or emigration.

all three

The rate of growth, r, is an estimate of

births subtracted by deaths.

Which of the following was derived from an ancestral cyanobacterium? 1)mitochondria 2)chlorosplasts

cholorplasts

Protists from which of the following taxonomic groups are most likely to lead to paralytic shellfish poisoning?

dinoflagellata

all protists are

eukaryotic

In species like sea turtles with high juvenile mortality, low adult mortality, and low fecundity, conservationists can most effectively help them by _____. See Section 51.6 (Page 1087) .

focus on keeping adults alive

Which of the following was derived from an ancestral cyanobacterium? 1) water molds 2) diatoms 3) cilates 4) foraminiferans

foraminiferans

A population is a __________.

group of individuals from the same species that live in the same area at the same time

Which of the following groups would be most likely to exhibit uniform dispersion?

infect liver cells

In some European countries, the population is declining. In these countries, the net reproductive rate, R0, is __________.

less than 1

net reproductive rate < 1 -->

population decline

net reproductive rate > 1 -->

population growth

net reproductive rate === 1 -->

populations stable

Which of the following is a constant for a given species?

rmax, the intrinsic rate of increase

Which of the following groups would be most likely to exhibit uniform dispersion? 1) parasitive thing in certain trees 2)squirrls defending territory 3) trout in o2 deep water 4) cattails, at edge of lake 5) moths in city at night

squirrls defending territory

Under what condition might r, the per capita rate of increase, approach rmax, the intrinsic rate of increase?

when resources are abundant