1. Base on the graph below, why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults? 0.5 0.5 40 50 30 40 30 20 20 10 10 0.30 0.36 0.42 0.48 0.54 0.60 Sex ratio 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Sex ratio (b) A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population. Frequency (a) Frequency I

1. Base on the graph below, why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults? 0.5 0.5 40 50 30 40 30 20 20 10 10 0.30 0.36 0.42 0.48 0.54 0.60 Sex ratio 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Sex ratio (b) A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population. Frequency (a) Frequency I

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter52: Population Ecology

Section: Chapter Questions

Problem 6TYK: One reason why human populations have been able to sidestep the factors that usually control...

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Suppose 200 fish are marked and released in a pond. The following week, 200 fish are caught and 100 of them have marks. There are about ______ fish in this pond. a. 200 b. 300 c. 400 d. 2,000
One reason why human populations have been able to sidestep the factors that usually control population growth is that: a. the carrying capacity for humans has remained constant sincehumans first evolved. b. agriculture and industrialization have increased the carryingcapacity for our species. c. the population growth rate (r) for the human population hasalways been small. d. the age structure of human populations has no impact on itspopulation growth. e. plagues have killed off large numbers of humans at certaintimes in the past.
1. In an attempt to save a rare endangered species, a number of zoos agree to begin a breeding program. A single pair of endangered species is expected to successfully rear an average of nine offspring per year, all of which survive to maturity (i.e., 4.5 per parent per generation). (A) Use the appropriate equation to calculate the number of individuals in the population after eight years.
9) This chart shows the beak length of a population of finches in the Galapagos. The island was faced with a five year drought that made it difficult for birds to get water. If natural selection occurs, how would you predict the bird beak lengths to change? A) Only those with shorter beaks would survive. B) The population would not really change much. C) Only those with the longest beaks would survive. D) Those with medium-long beaks would increase most. Not Graded
1. From the animals in the figure, which species could have a positive indirect effect on the Possum? 2. If you suspect that competition between Wallabies and Bandicoots is leading to coexistence, describe an example of a piece of evidence that would support your idea. 3. If Tasmanian devils become extinct in the wild due to DFTD, name a species other than cats that you expect would change in abundance as a result. Explain how you think that species' abundance would change and why.
1. 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?
In populations subjected to high levels of predation a. individuals should invest little in reproduction so as to maximize their survival. b. individuals should produce few offspring and invest little in any of them. c. individuals should invest greatly in reproduction because their chance of surviving to another breeding season is low. d. individuals should stop reproducing altogether.
You study a population of mussels recently introduced to a section of the Rideau River 9 years ago. You know that 20 mussels were originally let go in the river by a resident. These mussels have no predators. You know from your research that, under ideal conditions, the instantaneous rate of increase of this mussel species is 0.17. You also think the conditions on the river were ideal when the mussels were introduced. After surveying the food available in the river, you estimated that there is enough food to support a population of 12,700 mussels. How many mussels do expect to be in the river now?
4.) Mang Berto breeds white mice in a cage. After a few generations, the breeder observes that the white mice are more aggressive towards each other, the young are less healthy, and more young white mice die. What do you think will happen to the population of white mice? a.) The population is not affected. b.) The population will remain the same. c.) The population will decrease. d.) The population will increase 5.) South Cotabato is known for its wide variety of fruits and other plant species that makes it really attractive to tourists. Which of the following classification of biodiversity value is described? a.) Direct economic value b.) Indirect economic value c.) Ethical/ cultural d.) both B and C 9.) If the number of births in a population is the same as the number of deaths in a population, what will happen to the growth of the population? a.) It will fluctuate. d.) It will increase. c.) It will stay the same. d.) It will decrease. 10.) Refers to the number of…
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