Study Guide for the Final Examination
... Logistic Growth Occurs When New Populations Stabilize under environmental resistance (ER). Density-independent factors limit populations regardless of density Density-dependent factors become more effective as population density increase. Predators often switch prey based on its abundance. Parasites ...
... Logistic Growth Occurs When New Populations Stabilize under environmental resistance (ER). Density-independent factors limit populations regardless of density Density-dependent factors become more effective as population density increase. Predators often switch prey based on its abundance. Parasites ...
Communities and Populations
... Population Growth • Populations may stay the same size from year to year, or may grow/decline rapidly due to the removal/introduction of a predator or the introduction/removal of prey. • Population size is effected by: – Number of births – Number of deaths – Number of individuals that enter or leav ...
... Population Growth • Populations may stay the same size from year to year, or may grow/decline rapidly due to the removal/introduction of a predator or the introduction/removal of prey. • Population size is effected by: – Number of births – Number of deaths – Number of individuals that enter or leav ...
CHAPTER 8: POPULATION ECOLOGY Outline 8
... A. Populations change in size, density, and age distribution, most members of populations live together in clumps or groups 1. Three general patterns of population distribution occur in a habitat: clumping, uniform distribution and random dispersion. Most species live in clumps or groups. a. Availab ...
... A. Populations change in size, density, and age distribution, most members of populations live together in clumps or groups 1. Three general patterns of population distribution occur in a habitat: clumping, uniform distribution and random dispersion. Most species live in clumps or groups. a. Availab ...
No Population Can Grow Indefinitely: J-Curves and
... averages 31 days and the average litter size is 6 offspring. It is possible to have 8 litters per year. If we start with 1 fertile female and assume that 0 die and 50 percent of the litter is female, at the end of twelve months we have approximately 1,850 rabbits. • Bacteria populations can double e ...
... averages 31 days and the average litter size is 6 offspring. It is possible to have 8 litters per year. If we start with 1 fertile female and assume that 0 die and 50 percent of the litter is female, at the end of twelve months we have approximately 1,850 rabbits. • Bacteria populations can double e ...
Overall Growth Rate
... The average annual growth rate for world population since 1650 has been about 0.7%. However, the annual rate has varied significantly. It peaked at about 2.1% during the 1960’s and is currently (as of 2009) about 1.2%. Find the approximate doubling time for each of these growth rates. Use each to pr ...
... The average annual growth rate for world population since 1650 has been about 0.7%. However, the annual rate has varied significantly. It peaked at about 2.1% during the 1960’s and is currently (as of 2009) about 1.2%. Find the approximate doubling time for each of these growth rates. Use each to pr ...
Ecology of Populations
... The Remora attaches itself to the shark and saves energy since it doesn’t have to swim, and it gets to eat on the shark’s kills. The shark doesn’t get anything. ...
... The Remora attaches itself to the shark and saves energy since it doesn’t have to swim, and it gets to eat on the shark’s kills. The shark doesn’t get anything. ...
Populations - OnMyCalendar
... The regulation of a population by predation takes place within the predator-prey relationship (one of the best known mechanisms of population ...
... The regulation of a population by predation takes place within the predator-prey relationship (one of the best known mechanisms of population ...
Chp 4 PowerPoint
... quantity growing at a given annual percentage rate, divide the percentage number into 70 to obtain the approximate number of years required to double. For example, at a 10% annual growth rate, doubling time is 70 / 10 = 7 years. This results in a J curve ...
... quantity growing at a given annual percentage rate, divide the percentage number into 70 to obtain the approximate number of years required to double. For example, at a 10% annual growth rate, doubling time is 70 / 10 = 7 years. This results in a J curve ...
Response to External Factors
... Population growth rate: the change in the total population size per unit time. Natality (birth rate): the number of individuals born per unit time. Mortality (death rate): the number of individuals dying per unit time. ...
... Population growth rate: the change in the total population size per unit time. Natality (birth rate): the number of individuals born per unit time. Mortality (death rate): the number of individuals dying per unit time. ...
Chp 14 Ecosystems
... • A survivorship curve is a diagram showing the number of surviving members over time from a measured set of births. ...
... • A survivorship curve is a diagram showing the number of surviving members over time from a measured set of births. ...
Unit 3 Notes Packet KEY: Human Population Growth Vocabulary
... Demography- is the study of population, but most often refers to the study of human population. It studies the historical size and makeup of the populations of countries to make comparisons and predictions. I. Human Population Over Time -Up until the 1800’s, the human population was in a steady and ...
... Demography- is the study of population, but most often refers to the study of human population. It studies the historical size and makeup of the populations of countries to make comparisons and predictions. I. Human Population Over Time -Up until the 1800’s, the human population was in a steady and ...
POPULATION DYNAMICS
... When population is small, the size increases rapidly. Growth then decreases as it approaches K. Remember that the time needed to reach equilibrium is proportional to r. Rapidly growing populations will reach K faster (Ibid, 32). ...
... When population is small, the size increases rapidly. Growth then decreases as it approaches K. Remember that the time needed to reach equilibrium is proportional to r. Rapidly growing populations will reach K faster (Ibid, 32). ...
“Trade-offs” and Life Histories
... The human population is no longer growing exponentially but is still increasing rapidly No population can grow indefinitely, and humans are no exception.The human population increased relatively slowly until about 1650 and then began to grow exponentially. Though the global population is still growi ...
... The human population is no longer growing exponentially but is still increasing rapidly No population can grow indefinitely, and humans are no exception.The human population increased relatively slowly until about 1650 and then began to grow exponentially. Though the global population is still growi ...
Population growth
... Population increases at lambda per unit time or r at any instant in time r is useful because it can be transformed to fit time interval of interest, lambda is more intuitive ...
... Population increases at lambda per unit time or r at any instant in time r is useful because it can be transformed to fit time interval of interest, lambda is more intuitive ...
CH 43 Populations Notes - Lincoln Park High School
... Type I : Low mortality rate in early years. Small clutch sizes and good care for young… humans, large mammals Type II: constant mortality rate throughout life…many animals Type III: high mortality rate early in life large clutch size, little care for young…fish, marine invertebrates ...
... Type I : Low mortality rate in early years. Small clutch sizes and good care for young… humans, large mammals Type II: constant mortality rate throughout life…many animals Type III: high mortality rate early in life large clutch size, little care for young…fish, marine invertebrates ...
Document
... • What is Earth’s carrying capacity for human’s? • Have we already exceeded K? • What are consequences of human population growth for other species on this ...
... • What is Earth’s carrying capacity for human’s? • Have we already exceeded K? • What are consequences of human population growth for other species on this ...
NOTES: Chapter 8.1 - How Populations Change In Size
... Because natural conditions are neither ideal nor constant, populations cannot grow forever. ...
... Because natural conditions are neither ideal nor constant, populations cannot grow forever. ...
Population Ecology
... • maximum rate at which a population could grow given optimal conditions (food, water, space) ...
... • maximum rate at which a population could grow given optimal conditions (food, water, space) ...
In populations being controlled by density
... temperature changes, or severe storms and floods coming through an area can just as easily wipe out a large population as a small one. • habitat destruction: a harmful pollutant put into the environment, e.g., a stream. The probability of that harmful substance at some concentration killing an indiv ...
... temperature changes, or severe storms and floods coming through an area can just as easily wipe out a large population as a small one. • habitat destruction: a harmful pollutant put into the environment, e.g., a stream. The probability of that harmful substance at some concentration killing an indiv ...
Population Growth and Regulation Ecology Population Size
... Unevenly Distributed • Sweden’s population has stabilized. Sweden's population has reached replacement level fertility: the number of births equals the number of deaths. ...
... Unevenly Distributed • Sweden’s population has stabilized. Sweden's population has reached replacement level fertility: the number of births equals the number of deaths. ...
A look at populations (5 points) Part 1: In 1911, 25 reindeer, 4 males
... 9. What might account for the tremendous increase in the population of reindeer between 1930 and 1938, as compared with the rate of growth during the first years on the island? 10. What things would account for the tremendous drop of in population after 1938? 11. If some of the 8 reindeer that were ...
... 9. What might account for the tremendous increase in the population of reindeer between 1930 and 1938, as compared with the rate of growth during the first years on the island? 10. What things would account for the tremendous drop of in population after 1938? 11. If some of the 8 reindeer that were ...
World population
In demographics and general statistics, the term world population refers to the total number of living humans on Earth. The United States Census Bureau estimates that the world population exceeded 7 billion on March 12, 2012. According to a separate estimate by the United Nations Population Fund, it reached this milestone on October 31, 2011. In July 2015, the Population Division of the United Nations Department of Economic and Social Affairs estimated the world population at approximately 7.3 billion.The world population has experienced continuous growth since the end of the Great Famine and the Black Death in 1350, when it was near 370 million. The highest growth rates – global population increases above 1.8% per year – occurred briefly during the 1950s, and for longer during the 1960s and 1970s. The global growth rate peaked at 2.2% in 1963, and has declined to 1.1% as of 2012. Total annual births were highest in the late 1980s at about 139 million, and are now expected to remain essentially constant at their 2011 level of 135 million, while deaths number 56 million per year, and are expected to increase to 80 million per year by 2040.The 2012 UN projections show a continued increase in population in the near future with a steady decline in population growth rate; the global population is expected to reach between 8.3 and 10.9 billion by 2050. 2003 UN Population Division population projections for the year 2150 range between 3.2 and 24.8 billion. One of many independent mathematical models supports the lower estimate, while a 2014 estimate forecasts between 9.3 and 12.6 billion in 2100, and continued growth thereafter. Some analysts have questioned the sustainability of further world population growth, highlighting the growing pressures on the environment, global food supplies, and energy resources.Various scholarly estimates have been made of the total number of humans who have ever lived, giving figures ranging from approximately 100 billion to 115 billion.