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Assuming the original 10 organisms grew exponentially, doubling in size with every unit of time, calculate the
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- A student decides to use the mark-recapture technique to estimate thepopulation size of mosquitofish in a small pond near his home. In thefirst catch, he marked 45 individuals. Two weeks later, he captured 62individuals, of which 8 were marked. What is the estimated size of thepopulation based on these data?a. 134 c b. 349 c. 558 d. 1,016 e. 22,320You arrive on an alien planet and settle down to live there for a long time. There are very few species. Two of the species (A and B) are sometimes common and sometimes rare. When you start keeping track of population changes you discover that the population sizes fluctuate on a regular cycle in close synchrony. Species B always increases first, followed by species A. Which of the following would be the best explanation for what you are seeing? Group of answer choices -Species A is a predator and there is a time lag between changes in the density of its prey and species A's population change -Species A is a predator and it can respond instantly to changes in its prey population -Species B is a predator and there is a time lag between changes in the density of its prey and species B's population change -Species B is a predator and it can respond instantly to changes in its prey populationHumans are beginning to fragment populations more and more: which population structure is most useful in highly fragmented habitats that used to represent one large habitat? A. Source and sink modelsB. MetapopulationsC. Linear Stepping StoneD. Two dimensional stepping stone Which is typically the most appropriate population structure model when you are focusing on a remote, single island? A: Source and sink modelsB: MetapopulationsC: Linear Stepping StoneD: Two dimensional stepping stone
- In populations of unitary organisms, growth rates and rates of development are generally influenced by intraspecific competition. This essentially leads to density-dependent effects on the composition of a population. 1) Explain/discuss figure b (limpets) 2) Explain/discuss figure a (reindeers)A founder population of interesting creatures is established, and the average probability of identity by descent is calculated for each subsequent generation as follows: Generation F 1 0.05 2 0.0975 3 0.142625 4 0.2283625 a) What are the effective population sizes Ne for each Generation 1 through 4, relative to Generation 0 (the founder population)? b) What is the effective population size of Generation 4 relative to Generation 3? c) Is there any evidence for changes in population size after the founder event, and if so, at which generation did the size change in the number of breeding individuals occur?You want to estimate the population size of pink salmon in the upper pitt river and use a mark-recapture technique to do so. You mark 1313 individuals as they pass under the port mann bridge. two weeks later you recapture 2245 individuals in pitt lake of which 204 have marks on them. What is your estimate of the population size?
- The northern hairy-nosed wombat has experienced historical population declines, though population have stabilized recently due to conservation efforts. While studying them researchers noticed the following fluctuations in (effective) population size: Year 1: 100 individuals Year 2: 90 individuals Year 3: 50 individuals Year 4: 75 individuals Year 5: 90 individuals Year 6: 95 individuals A. Given this information what is the long-term effective population size of this particular population over the six years? B. Assume that at the start of the study the researchers determined heterozygosity for this population to be 0.63 at microsatellite loci. What would you expect the heterozygosity to be at the end of the six years? (Answer part B)The graph below includes information on the average time to fixation of an allele (in generations) as a function of population size. The three different curves represent different starting allele frequencies. Which of the following statements correctly describes patterns depicted in the graph below? I. As population size increases, it takes fewer generations for alleles to reach fixation II. As starting allele frequency increases, it takes fewer generations for alleles to reach fixation III. Small populations will lose alleles more rapidly than large populations. IV. Even if starting allele frequency is low, fixation is possible - it just happens slowly. Only III is a correct description Only II is a correct description II, III, & IV are correct descriptions Both II & III are correct descriptions Both I & II are correct descriptions All four statements (I, II, III & IV) are correct descriptions asap pleaseThe data chart below shows the number of black and tan mice in a population in a field over five generations. Which of the following is the most likely explanation of the findings? Question options: A natural disaster occurred during the second generation causing a reduction in the number of black mice and a bottleneck population of tan mice was left to reproduce. A random genetic mutation occurred in a black mouse in generation three, leading to a decline in the population. The predator of the mice hunts during the day when the tan mice are better camouflaged in the environment so the black mice were eaten more frequently. The tan mice were able to acquire the ability to adapt to the environment quickly between the first and second generation.
- Population size increases whena. the sum of birth rate and death rate exceeds the sum ofimmigration and emigration.b. the sum of birth rate and immigration exceeds the sum of deathrate and emigration.Figure 37.20 Opportunistic and Equilibrium Species:A Summary.• High reproduction rate• Many o spring• Each o spring receives littleparental care• Low survival rate for juveniles• Early reproductive maturity• Type III survivorship curve:Opportunistic life history Equilibrium life history• Low reproduction rate• Few o spring• Each o spring receivesextensive parental care• High survival rate for juveniles• Late reproductive maturity• Type I survivorship curve:AgeSurvivorsAgeSurvivors764 UNIT SEVEN The Ecology of Lifehoe2420X_ch37_748-765.indd 764 12/15/16 11:45 PMc. the sum of birth rate and emigration exceeds the sum of death rateand immigration.d. the sum of death rate and immigration exceeds the sum of birthrate and emigration.Figure 45.16 Age structure diagrams for rapidly growing, slow growing, and stable populations are shown in stages 1 through 3. What type of population change do you think stage 4 represents?Which of the following situations could decrease the average fitness of a population? Snakes in a small, reproductively isolated populations must breed with blood-relatives. Atlantic salmons adapted to live in captivity escape from a fish farm and breed with wild stocks. Seeds dispersed by wind arrive on an island, germinate and begin breeding with the existing island population. All are correct A sudden forest fire kills 95% of a population of minks, leaving behind the remaining 5% to repopulate the area.
