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Population Growth
R and K Selection
R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.
a |
naturally
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b |
linearly
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c |
slowly
|
d |
exponentially
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- In the short term what willhappen to the levels aboveand below a population ofsecondary consumers of anumeric pyramid if a largenumber of individuals fromthis population dies?Which factor is not responsible for the large increase in the human population over the last 300 or so years?a. Larger and more reliable food reserves from the modernization of farming techniquesb. Decreasing mortality rate due to improvements in medicinec. Increasing amounts of open space as countries developd. Increased sanitation practicesConcerning population size and population density, explain one way each of the terms differ from each other in relation to their a. importance in predicting competition in a population; b. importance in predicting resource use in an area; and c. relationship with each other. (17.2)
- Use the graph below to answer the question Which population description is most kely represented by the graph? Population over Time Time (years) A population of mice slowly increases but then fluctuates scasonaily as predators raise their young and limit prey populations. OA population of wolves slowly increases becaüse of limiting factors in the environment but then increases constantly when additional prey migrate into the environment. A population of birds quickly increases but then becomes stable duc to limiting factors in the cnvironment. DA population of moose decreases duc to compctition with bison in the ecosystem. Number of Individuals in PopulationState by what percentage the world’s human population is changing each year.Why has the human population continued to grow despiteenvironmental limitations? Give one example of an innovationthat increased the carrying capacity for humans.
- What are the two key concepts for this section? Listthree variables that affect the growth and decline ofhuman populations. How can we calculate the population change of an area? Define the total fertilityrate (TFR). How has the global TFR changed since1955? Summarize the story of population growth inthe United States. List six changes in lifestyles thathave taken place in the United States during the 20thcentury, leading to a rise in per capita resource use.When a population of organisms is evolving, what can you be sure is happening? a. No change is occurring b. It is improving c. It is becoming more human-like d. It is changingUse Verbal description of results from graph and then Interpret the graph for Effect of Food Density sccenario in foraging lab. The interpretations must include Were the results expected and Did they support the hypotheses? If so, state the biological significance of the results from graph. If the results deviated significantly from expected results, discuss the hypotheses onthe basis of expected results and include an explanation of why this might be so. Lastly, state the conclusions drawn from the experiment and their biological relevance. Hypothesis: higher food density corresponds to an extended duration of foraging.
- How hos the growth of Earth s humon population changed in recent decades? Answer in terms of groth rate an the number of people added each year.How can a person determine if a population is evolving?Three characteristics of a population are the birth rate, growth rate, and death rate. How has each been affected by (a) modern medicine, (b) modern agriculture, and (c) modern industry