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Ecology Unit readings
Ecology Unit readings

...  Energy is transferred from one level of feeding to another level  Water, carbon and other compounds/elements are cycled through the environment  An energy pyramid shows the distribution of energy among trophic levels  Habitats and niches differ  Available resources are what gives structure to ...
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File

... 4. Which of the following is not a statement of the logistic growth model? a. Population growth is limited by density-dependent factors. b. A population will initially increase exponentially and then level off as it approaches the carrying capacity of the environment. c. Future population growth ca ...
Population Ecology
Population Ecology

... A population of 2500 yeast cells in a culture tube is growing exponentially. If the intrinsic growth rate is 0.030 per hour, calculate: a) the initial instantaneous growth rate of the yeast population. b) the time it will take for the population to double in size. c) the population size after four d ...
Chapter 24
Chapter 24

... consumers in an ecosystem form its trophic structure. ...
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in population size

... •All species have potential for explosive, exponential growth; absent resource limitations, growth would be exponential •Biotic potential (rmax) is the maximum rate at which a population could increase under ideal conditions •Exponential growth has been demonstrated experimentally in bacterial and ...
SBI4U Population Dynamics
SBI4U Population Dynamics

... THREE different measurements that scientists use to describe populations ...
Population - Ms. Farrell`s Science Center
Population - Ms. Farrell`s Science Center

... Factors that Influence Population Size Density Dependent • The growth slowed due to the lack of resources – Carrying Capacity: the number of individual an ecosystem can sustain • Given variable K ...
B 262, F 2002 Name
B 262, F 2002 Name

... SHORT ANSWER/PROBLEMS. Address each question in as concise and lucid a manner as possible. (10%) 1. A population of 10,000 rabbits is growing logistically and has a yearly intrinsic rate of increase of 0.2. The carrying capacity is 100,000. What is the size of this population after one year? After ...
Ecology Unit Study Guide (Chapters 15-18)
Ecology Unit Study Guide (Chapters 15-18)

... 11. Explain why the carbon cycle is important to living things. ...
Consumer-Resource Interactions I
Consumer-Resource Interactions I

... predator populations will lag because they cannot rebound until 1) after the prey population begins to increase and 2) they convert this food into offspring. The longer the lag, the greater the amplitude in the oscillation (as we saw in single species dynamics). b. Seasonal refuges for prey can inc ...
Number decreases Size increases
Number decreases Size increases

... The Pyramid of Biomass A pyramid of biomass shows the total biomass at each stage of a food chain. Biomass is the mass of all the organisms in that population. Biomass goes down as you move along a food chain, so this gives a pyramid shape. ...
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B_Division_Virginia_Regional_Ecology_Test_2009

... 30. Which of the following describes a type I survivorship curve? a) Most individuals die of old age b) Individuals die at a constant rate throughout time c) Many individuals die early in life d) Most individuals die during their reproductive years 31. Which of the following describes a type II surv ...
Chapter 1 Environmental Problems, Their Causes, and Sustainability
Chapter 1 Environmental Problems, Their Causes, and Sustainability

... • Groups have a better chance of finding clumped resources • Protects some animals from predators • Packs allow some to get prey Population of Snow Geese Generalized Dispersion Patterns Populations Can Grow, Shrink, or Remain Stable (1) Population size governed by • Births • Deaths • Immigration • E ...
AP Biology
AP Biology

... ___14) An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species. The first step in testing this hypothesis would be to determine A) whether populations of the rabbit that live outside the range of the owl have ...
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unit 12 pwpt notes_F14 (1)

... as the glaciers melted. This elevation change occurred when land that had been pushed up by the weight of the thick glaciers sank back down as the glaciers disappeared. The current rate of sea level rise along the North Carolina coast is about twice the worldwide average. ...
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... 13. Rabbits that were introduced to Australia in the 1850s multiplied so rapidly because they had no ______________________. 14. The entire range of conditions an organism can tolerate is its ______________________ ______________________. 15. Back-and-forth evolutionary adjustments between interacti ...
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Chapter 35

... • 6. Biosphere- all the world’s biomes, along with its marine and freshwater assemblages, together constitute an interactive system called the ...
Ecology
Ecology

... Exponential Growth- under ideal conditions (food, shelter, light, etc.) most species can grow at exponential rate. Logistic Growth – most populations do not live under ideal conditions therefore they do not grow exponentially. Factors that limit growth are known as density dependent factors (food, s ...
Lesson 02- Population and Carrying Capacity kw
Lesson 02- Population and Carrying Capacity kw

... a particular species that a given ecosystem can _________________ . When a population is maintained at its carrying capacity, the size of  the population is at an __________________. A biodiverse  equilibrium ecosystem can maintain an equilibrium.  ...


... started with 25,000 cal, how many would the primary consumer obtain?  2,500 cal  Tertiary consumer?  25 cal  DQ - What does this mean for humans? ...
Population Ecology
Population Ecology

... recombination that allows an individual with two favorable mutations to be rapidly produced from two individuals each with a single favorable mutation. Sex (involving meiosis) is not the only means of genetic recombination that life forms have devised. Many bacteria can import naked pieces of DNA an ...
Lesson 6 - Kingsborough Community College
Lesson 6 - Kingsborough Community College

... 23. When a population has inhabited an area for a long time and the population size has stabilized because of resource limitations: a. Carrying capacity has been reached b. Density dependence occurs c. Predation decreases d. Density independence occurs e. Environmental resistance declines 24. An ins ...
Ecology and Biomes Section
Ecology and Biomes Section

... level. 2. In the scenario which is greater the death rate or the birth rate? 3. What does this tell us about Earth’s population growth? 4. List some things that would make the Reaper’s cup larger…Real life things. 5. What would need to happen to have the water level remain constant? ...
Ecology - Warren County Schools
Ecology - Warren County Schools

... Components of an ecosystem can be changed by natural events, such as fires. When the disturbance is over, community interactions tend to restore the ecosystem to its original condition through secondary succession ...
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Maximum sustainable yield

In population ecology and economics, maximum sustainable yield or MSY is theoretically, the largest yield (or catch) that can be taken from a species' stock over an indefinite period. Fundamental to the notion of sustainable harvest, the concept of MSY aims to maintain the population size at the point of maximum growth rate by harvesting the individuals that would normally be added to the population, allowing the population to continue to be productive indefinitely. Under the assumption of logistic growth, resource limitation does not constrain individuals’ reproductive rates when populations are small, but because there are few individuals, the overall yield is small. At intermediate population densities, also represented by half the carrying capacity, individuals are able to breed to their maximum rate. At this point, called the maximum sustainable yield, there is a surplus of individuals that can be harvested because growth of the population is at its maximum point due to the large number of reproducing individuals. Above this point, density dependent factors increasingly limit breeding until the population reaches carrying capacity. At this point, there are no surplus individuals to be harvested and yield drops to zero. The maximum sustainable yield is usually higher than the optimum sustainable yield and maximum economic yield.MSY is extensively used for fisheries management. Unlike the logistic (Schaefer) model, MSY has been refined in most modern fisheries models and occurs at around 30% of the unexploited population size. This fraction differs among populations depending on the life history of the species and the age-specific selectivity of the fishing method.However, the approach has been widely criticized as ignoring several key factors involved in fisheries management and has led to the devastating collapse of many fisheries. As a simple calculation, it ignores the size and age of the animal being taken, its reproductive status, and it focuses solely on the species in question, ignoring the damage to the ecosystem caused by the designated level of exploitation and the issue of bycatch. Among conservation biologists it is widely regarded as dangerous and misused.
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