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Ecology Part 2
Ecology Part 2

... 1) Exponential growth model • Also called geometric growth or J-shaped growth. • First growth phase is slow and called the lag phase • Second growth phase is rapid and called the exponential growth phase • Bacteria can grow at this rate, so why aren’t we up to our ears in bacterial cells? ...
Chp 14 Ecosystems
Chp 14 Ecosystems

... – Commensalism: one organism benefits, the other is ...
Populations & Population Growth
Populations & Population Growth

... faster it can grow. Why? Because there are more orgs reproducing ...
Population Biology 2011 edit 2
Population Biology 2011 edit 2

... indefinitely? 5. What is the relation ship of births to deaths in a population before the population reaches the environment’s carrying capacity? 6. What happens when the population exceeds the carrying capacity? 7. What are some limiting factors that can curb population growth? ...
Chapter 5 Bio Roche
Chapter 5 Bio Roche

... Demography is the study of populations • Demography helps to explain the patterns of population growth and decline • Birthrates, death rates, and the age structure help predict the growth rate of countries • Globally, the growth rate hit a peak in the 60’s at around 2% • The current growth rate is ...
Chapter 6 – Population and Community Ecology
Chapter 6 – Population and Community Ecology

... 20. Define symbiotic relationships. List the three population interactions that are examples of symbiotic relationships. Use the blank table below to indicate the effects on both partners in the four relationships listed: ...
Populations & Population Growth
Populations & Population Growth

... faster it can grow. Why? Because there are more orgs reproducing ...
Ecosystems – Unit 2 - Reeths
Ecosystems – Unit 2 - Reeths

... Human Our eyelashes are home to tiny mites that feast on oil secretions and dead skin. Without harming us, up to 20 mites may be living in one eyelash follicle. ...
Name(s) Date Design Your Own Logistic Model of Population
Name(s) Date Design Your Own Logistic Model of Population

... 2) How many months did it take for the rabbits to reach their carrying capacity given the initial birthrate of .40? ____________ 3) How many months did it take for the rabbits to come within one unit of their carrying capacity (999 rabbits), given the initial birthrate of .40? __________ Is this tim ...
Factors Affecting Population Change
Factors Affecting Population Change

... Weather events such as a hurricane, flood, drought or “cold snap” occur irrespective of population density Every winter, millions of monarch butterflies from North America migrate south to Mexico where they gather on trees In January 2002, a “cold snap” killed 60% of all monarch butterflies ...
Population growth & regulation
Population growth & regulation

... This gives an idea of how many individuals make it each yearthe mortality pressures on that organism. The shape of the survivorship curve matters. Different shapes are associated with different life history patterns. Organisms that have relatively uniform survivorship across their life would have a ...
Chapter 8 - Cherokee County Schools
Chapter 8 - Cherokee County Schools

... – Cyclic: populations fluctuate in regular cyclic or boom-andbust cycles; lemmings, lynx & snowshoe hare; – Irregular: erratic changes possibly due to chaos or periodic catastrophic population crashes due to severe winter ...
Review Game
Review Game

... If the growth rate r of a population is positive and remains constant, the number of people added to the population A. remains constant. B. fluctuates randomly. C. decreases each year. D. reaches carrying capacity. E. increases each year. ...
Review Game
Review Game

... If the growth rate r of a population is positive and remains constant, the number of people added to the population A. remains constant. B. fluctuates randomly. C. decreases each year. D. reaches carrying capacity. E. increases each year. ...
Document
Document

... dN = rN ∆t dt Exponential growth occurs when resources are unlimited and the population is small (doesn’t happen often). The r is maximal (rmax) and it is called the intrinsic rate of increase. ...
Population Ecology
Population Ecology

...  Approximately 82 million people are added to the world’s population every year  Current doubling time is 56 years ...
Pop Ecology - Mr. Wells` wikispace
Pop Ecology - Mr. Wells` wikispace

... • Type I curve – parents produce few offspring and give them good care • Type III curve – high death rates for infants then a period when death rates are lower for those who survive to a certain age ...
Chapter 26
Chapter 26

... 26.8 Fertility Rates and Age Structure A. At the present rate of increase, the world human population may reach 8.9 billion by 2050. 1. The total fertility rate (TFR) is the average number of children born to women during their reproductive years, and is currently 2.8 children per female. 2. Even i ...
Population Dynamics - Amazing World of Science with Mr. Green
Population Dynamics - Amazing World of Science with Mr. Green

... Rate at which a population grows with unlimited resources is intrinsic rate of increase (r) High (r) (1)reproduce early in life, (2)short generation time, (3)multiple reproductive events, (4)many offspring each time BUT – no population can grow indefinitely Always limits on population growth in natu ...
video slide - Diamond Bar High School
video slide - Diamond Bar High School

... • A country’s age structure can be used to predict future population growth. • LDC’s have larger population growth because they have more women entering the reproductive years than older women leaving them. • Zero Population Growth: If each couple has two children to replace themselves, eventually t ...
CH. 4 POPULATION ECOLOGY
CH. 4 POPULATION ECOLOGY

... • Logistic growth occurs when the populations growth slows or stops following exponential growth. – Population has reached the carrying capacity • Develops an S-shaped curved graph • Logistic growth happens when there are less births than deaths or more emigration than immigration. ...
population growth
population growth

... populations of the earth have progressed through over time, as they moved from hunter gatherer societies to societies with increased wealth and survival advantages. Stage 1: ...
Factors Affecting Population Change
Factors Affecting Population Change

... regardless of population density Human intervention - Pesticides  Environment - reproductive success based on temperatures, natural disasters etc ...
CHAPTER 8: POPULATION ECOLOGY Outline 8
CHAPTER 8: POPULATION ECOLOGY Outline 8

... grass cover by over-grazing allowed sagebrush to move in and reduce the number of cattle that the land could support. 3. Technological, social, and cultural changes have extended the earth’s carrying capacity for human beings, for the time being. G. The density of a population may or may not affect ...
number of individuals - Trinity Regional School
number of individuals - Trinity Regional School

... Some questions to consider— 1. Why would populations change over? 2. Human population grew exponentially about 500 years ago. Why? 300 years ago? 3. Why do populations in underdeveloped countries continue to grow exponentially while the rest of the world is at the steady state? ...
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The Population Bomb

The Population Bomb is a best-selling book written by Stanford University Professor Paul R. Ehrlich and his wife, Anne Ehrlich (who was uncredited), in 1968. It warned of the mass starvation of humans in the 1970s and 1980s due to overpopulation, as well as other major societal upheavals, and advocated immediate action to limit population growth. Fears of a ""population explosion"" were widespread in the 1950s and 60s, but the book and its author brought the idea to an even wider audience. The book has been criticized since its publishing for its alarmist tone, and in recent decades for its inaccurate predictions. The Ehrlichs stand by the basic ideas in the book, stating in 2009 that ""perhaps the most serious flaw in The Bomb was that it was much too optimistic about the future"" and believe that it achieved their goals because ""it alerted people to the importance of environmental issues and brought human numbers into the debate on the human future.""
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