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Populations - Westford Academy Ap Bio
Populations - Westford Academy Ap Bio

... decrease until the population reaches K – Result N=K and r=0 ...
Table of Contents - Milan Area Schools
Table of Contents - Milan Area Schools

... • The mathematical representation of this type of growth (logistic growth) is: DN/Dt = r[(K – N)/K]N • The equation for logistic growth indicates that the population’s growth slows as it approaches its carrying capacity (K). • Population growth stops when N = K. ...
Population Dynamics and Conservation
Population Dynamics and Conservation

... Which strategy would you use?  Many offspring at ...
AP® Biology Scoring Guidelines Question 2 Many populations
AP® Biology Scoring Guidelines Question 2 Many populations

... (a) Describe what is occurring in the population during Phase A. (b) Discuss THREE factors that might cause the fluctuations shown in Phase B. (c) Organisms demonstrate exponential (r) or logistic (K) reproductive strategies. Explain these two strategies and discuss how they affect population size o ...
Population Growth
Population Growth

... • Logistic Growth (S curve): starts as exponential growth with limiting factors and levels off (due to carrying capacity) Carrying capacity • Carrying Capacity is the MAXIMUM number of individuals an environment and its resources can support Time (hours) ...
Population Dynamics
Population Dynamics

... extent possible given environmental conditions  Biotic potential  Dependent on innate biological principles ...
Chapter 8 and 9 vocabulary Crossword and Word Search
Chapter 8 and 9 vocabulary Crossword and Word Search

... Across 8. An area defended by one or more individuals against other individuals. 10. The maximum number of offspring that each member of a population can produce. 12. A relationship in which different individuals or populations attempt to use the same limited resource. 15. All the members of a speci ...
Computational Models
Computational Models

... • Solving for this differential equation means finding an ...
File
File

... Are humans experiencing exponential or logistic growth? Do you think humans are close to the Earth’s carrying capacity? Why? ...
Chapter 5 Section 1 How Populations Grow
Chapter 5 Section 1 How Populations Grow

... • Three important characteristics of a population are its geographic distribution, density, growth rate, and population age structure. – Density – the number of individuals per unit area. This can vary greatly depending on the species and its ecosystem. – Geographic distribution – also called the ra ...
Global Fisheries
Global Fisheries

... management of single species stocks  The largest yield (or catch) over an indefinite period  At intermediate population densities individuals are able to ...
density-dependent limiting factor
density-dependent limiting factor

... Are humans experiencing exponential or logistic growth? Do you think humans are close to the Earth’s carrying capacity? Why? ...
File
File

...  Characteristic of populations WITHOUT limiting factors ...
Populations Review
Populations Review

... Which of the following describes a condition in which logistic growth would occur ...
Chapter 4 * Population Ecology
Chapter 4 * Population Ecology

... (nonliving) and includes weather events – drought, flooding, extreme heat or cold, tornadoes, and hurricanes. – Density-dependent factors = usually biotic (living) – predation, disease, parasites, and competition. • Isle Royale, U.P. Michigan ...
5.3 Populations
5.3 Populations

... – Natality – number of new species due to reproduction – Mortality – number of deaths – Immigration – members arriving from other places – Emigration – members leaving the population ...
Populations, Communities & Ecosystems
Populations, Communities & Ecosystems

... Harvesting crops and hunted species without damaging the resource. ...
populations - Ms. Leyda`s Homepage
populations - Ms. Leyda`s Homepage

... Population grows rapidly until some factor ________ limits growth _____________ a. When does population growth slow or stop? 1. Birthrate – Down 2. Immigration – Down 3. Death rate – Up 4. Emigration – Up b. Example: Any animal population in nature. ...
Characteristics of Populations
Characteristics of Populations

...  Reproductive age span  Litter size  How many offspring survive to reproductive age  How often reproduction occurs Rapidly growing populations in nature may be limited by  Light  Water  Space  Nutrients Environmental resistance is enhanced by a specialized niche. A population will increase i ...
QA: Populations - ANSWER KEY - Liberty Union High School District
QA: Populations - ANSWER KEY - Liberty Union High School District

... The change in population over time (growth rate) is represented by this letter? This equation/rule helps a scientist determine the amount of time required for a population to double in size? These factors affect populations randomly; examples include fire, drought, flood? These factors affect popula ...
Populations: Extinctions and Explosions
Populations: Extinctions and Explosions

... sidestepped limiting factors? • People spread into more habitats because they could build shelters, use fire, and ...
Environment and Organisms
Environment and Organisms

... some environmental limits, such as lack of nutrients, energy, disease, living space and other resources.  These are called limiting factors because they limit how many members of a population can be sustained in an area. There are two main categories of limiting factors: density-dependent factors a ...
Ecology - Coastalzone
Ecology - Coastalzone

... Density dependent factors • As population increases the rate of growth is slowed by density dependent factors either by increasing the death rate or decreasing the birth rate • predation, disease, intraspecifc (within a species) competition and interspecific competition ...
Slide 1
Slide 1

... rate- the number of offspring an individual can produce in a given time period, minus the deaths of the individual or offspring during the same ...
Population Ecology
Population Ecology

... https://www.youtube.com/watch?v=jk-HxJEYzEM ...
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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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