ppt Ecology
... Describes a population that increases rapidly after only a few generations The larger the population gets, the faster it grows “J” shaped curve ...
... Describes a population that increases rapidly after only a few generations The larger the population gets, the faster it grows “J” shaped curve ...
Populations and Communities Chapter 20 Test
... h. A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce i. All the different populations that live together in an area j. A symbiotic relationship in which both species benefit k. The struggle between organisms to surviv ...
... h. A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce i. All the different populations that live together in an area j. A symbiotic relationship in which both species benefit k. The struggle between organisms to surviv ...
Limits on Populations.
... are density-independent. They will affect a population regardless of its size. When the density of a population increases, other factors may limit further growth or reduce population numbers. Density-dependent factors affect a population because of the density of the population. Food supply, water q ...
... are density-independent. They will affect a population regardless of its size. When the density of a population increases, other factors may limit further growth or reduce population numbers. Density-dependent factors affect a population because of the density of the population. Food supply, water q ...
任课院系:资源环境学院 环境系 任课教师:张颖
... become separated for a long period of time and, as a result, two species eventually form as these two subgroups respond to different ecological pressures. a: True b: False The dominant species in a terrestrial pioneer community are a: grasses b: beetles c: lichens d: conifers Temperature and precipi ...
... become separated for a long period of time and, as a result, two species eventually form as these two subgroups respond to different ecological pressures. a: True b: False The dominant species in a terrestrial pioneer community are a: grasses b: beetles c: lichens d: conifers Temperature and precipi ...
Ecology Presentation
... a population per unit area of habitat at a specific time. In low density populations, individuals spaced will apart e.g. Tigers are solitary animals, found at low densities. In high density populations, individuals are crowded together e.g. Termites form ...
... a population per unit area of habitat at a specific time. In low density populations, individuals spaced will apart e.g. Tigers are solitary animals, found at low densities. In high density populations, individuals are crowded together e.g. Termites form ...
Human population overshoot what went wrong?
... Humans are also different from other species in that our intelligence has allowed us to substitute learning for at least part of instinctual behavior. This substitution of learning for instinct, together with the use of external energy, seems to have led to overpopulation. There are currently 7 bill ...
... Humans are also different from other species in that our intelligence has allowed us to substitute learning for at least part of instinctual behavior. This substitution of learning for instinct, together with the use of external energy, seems to have led to overpopulation. There are currently 7 bill ...
ECOLOGY
... • Food webs: complex energy interactions found in an ecosystem. Energy pyramids: representation of the total energy available to a trophic level. ...
... • Food webs: complex energy interactions found in an ecosystem. Energy pyramids: representation of the total energy available to a trophic level. ...
ECOLOGY
... occurs when a disturbance of some kind (fire, land clearing or plowing) changes the community without removing the soil. Begins with grasses and then follows the same pattern as a primary succession. ...
... occurs when a disturbance of some kind (fire, land clearing or plowing) changes the community without removing the soil. Begins with grasses and then follows the same pattern as a primary succession. ...
Carrying Capacity and Limiting Factor activity
... enough food. No matter how much shelter, water and other resources there were, the population would not grow much larger than 10 giraffes. The largest population that an area can support is called its carrying capacity. The carrying capacity of this giraffe habitat would be 10 giraffes. The size of ...
... enough food. No matter how much shelter, water and other resources there were, the population would not grow much larger than 10 giraffes. The largest population that an area can support is called its carrying capacity. The carrying capacity of this giraffe habitat would be 10 giraffes. The size of ...
Competition 1. What is competition? 2. Intra
... Logistic growth assumes that the rate of reproduction is proportional to the amount of available resources. Thus the second term models the competition for available resources, which tends to limit pop growth. Logistic population growth is too static to accurately reflect how natural populations cha ...
... Logistic growth assumes that the rate of reproduction is proportional to the amount of available resources. Thus the second term models the competition for available resources, which tends to limit pop growth. Logistic population growth is too static to accurately reflect how natural populations cha ...
Species Concept
... In 2013, Earth Overshoot Day fell on August 20 – the day when the world has used as much of Earth’s resources as Earth can replace in one year. ...
... In 2013, Earth Overshoot Day fell on August 20 – the day when the world has used as much of Earth’s resources as Earth can replace in one year. ...
Examples of limiting factors
... • In many cases they act to regulate each other. • E.g. If there are more predators, the population of prey will decrease. If prey numbers decrease, there is less food for the predators so their population decreases. ...
... • In many cases they act to regulate each other. • E.g. If there are more predators, the population of prey will decrease. If prey numbers decrease, there is less food for the predators so their population decreases. ...
PPT Slide - Tennessee State University
... Stochastic extinction models usually do not include densitydependent changes in birth and death rates. If density-dependent birth and death rate includes, it rarely goes extinction (unless the population size is very small), as a population drops below K, the birth rate will increase and death rate ...
... Stochastic extinction models usually do not include densitydependent changes in birth and death rates. If density-dependent birth and death rate includes, it rarely goes extinction (unless the population size is very small), as a population drops below K, the birth rate will increase and death rate ...
Populations and Communities
... Survival Rate, lx: proportion of the population surviving to age x. Fecundity Rate, mx: average number of young produced per individual for age x. Net Reproductive Rate, R0: average number of young produced by an individual in its ...
... Survival Rate, lx: proportion of the population surviving to age x. Fecundity Rate, mx: average number of young produced per individual for age x. Net Reproductive Rate, R0: average number of young produced by an individual in its ...
Ch. 38
... • No matter how rapidly populations grow, they eventually reach a limit imposed by shortages of important environmental factors • A population ultimately stabilizes at a certain size, called the carrying capacity the carrying capacity is symbolized by K and is defined as the maximum number of indi ...
... • No matter how rapidly populations grow, they eventually reach a limit imposed by shortages of important environmental factors • A population ultimately stabilizes at a certain size, called the carrying capacity the carrying capacity is symbolized by K and is defined as the maximum number of indi ...
Ecology notes - Pierce Public Schools
... Higher levels are layered on top of one another The total energy transfer from one trophic level to the next is only about __ ...
... Higher levels are layered on top of one another The total energy transfer from one trophic level to the next is only about __ ...
Unit 8: Community Interactions REVIEW GUIDE KEY Documentaries
... 22. Parasites are usually smaller/ bigger than their hosts. (circle correct word) 23. How is a parasite different from a predator? Parasites rarely kill their hosts; unlike a predator, who kills their prey in order to feed. 24. What is meant by the term ‘carrying capacity’? Carrying capacity is the ...
... 22. Parasites are usually smaller/ bigger than their hosts. (circle correct word) 23. How is a parasite different from a predator? Parasites rarely kill their hosts; unlike a predator, who kills their prey in order to feed. 24. What is meant by the term ‘carrying capacity’? Carrying capacity is the ...
AP Biology – Ecology Unit Study Guide – C. Gray Mitchell This list is
... The role of biotic & abiotic factors in the formation of biomes Key features of freshwater and marine biomes Major terrestrial biomes and their characteristics. How density, dispersion, and demographics can describe a population. The differences between exponential and logistic models of p ...
... The role of biotic & abiotic factors in the formation of biomes Key features of freshwater and marine biomes Major terrestrial biomes and their characteristics. How density, dispersion, and demographics can describe a population. The differences between exponential and logistic models of p ...
CH 5 Overview Notes
... • To predict human population growth, demographers must consider the age structure of each country, as well as the prevalence of life-threatening diseases. • If growing countries move toward the demographic transition, growth rate may level off or decrease. ...
... • To predict human population growth, demographers must consider the age structure of each country, as well as the prevalence of life-threatening diseases. • If growing countries move toward the demographic transition, growth rate may level off or decrease. ...
Unit 5
... Type I – humans (relatively flat at the start, reflecting low death rates during early and middle life, dropping steeply as death rates increase among older age groups. Type II – intermediate, with mortality more constant over the lifespan (hydra-lizard species) Type III – drops sharply at the left ...
... Type I – humans (relatively flat at the start, reflecting low death rates during early and middle life, dropping steeply as death rates increase among older age groups. Type II – intermediate, with mortality more constant over the lifespan (hydra-lizard species) Type III – drops sharply at the left ...
Biology EOC Class 5 - Steilacoom School District
... decrease over time Even throughout = the population will remain constant over time ...
... decrease over time Even throughout = the population will remain constant over time ...
Population Ecology
... The previous two models assume an unlimited resource supply, which is never the case in the real world. However, when a population is just starting out, resources are plentiful and the population grows rapidly. As the population grows, resources are being used up and the population nears the ecosyst ...
... The previous two models assume an unlimited resource supply, which is never the case in the real world. However, when a population is just starting out, resources are plentiful and the population grows rapidly. As the population grows, resources are being used up and the population nears the ecosyst ...
Unit 5
... 3. Explain how interspecific competition may affect community structure. As populations of the two competing species grow, resources become more scarce, mortality increases, birth decreases, and population growth is curtailed. 4. Describe the competitive exclusion principle, and explain how competit ...
... 3. Explain how interspecific competition may affect community structure. As populations of the two competing species grow, resources become more scarce, mortality increases, birth decreases, and population growth is curtailed. 4. Describe the competitive exclusion principle, and explain how competit ...
Notes compiled - Raleigh Charter High School
... One can consider herbivore to be predator of grasses and one can see a similar relationship. Human population explosion: There are almost 6 billion people in the world right now. Some estimate that 10 billion is our carrying capacity although technological advances can change that. It is expected th ...
... One can consider herbivore to be predator of grasses and one can see a similar relationship. Human population explosion: There are almost 6 billion people in the world right now. Some estimate that 10 billion is our carrying capacity although technological advances can change that. It is expected th ...