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File

... What is the advantage to using per capita birth and death rates rather than just the raw numbers of births and deaths? ...
Population Dynamics
Population Dynamics

... Emigration: movement of individuals out of a population ...
Populations Review Sheet - Liberty Union High School District
Populations Review Sheet - Liberty Union High School District

... Use the following situation for questions 1-4: Mathpracticetopia is an island of 5000 square miles off the coast of Yourewelcome. There are currently 250,000 inhabitants of the island. Last year, there were 12,000 new children born and 10,000 people died. 1. What is the current population density? 2 ...
Population Growth
Population Growth

... • A species can reach its biotic potential - the highest possible per capita growth rate for a population. • Factors that determine biotic potential are related to ...
How Populations Grow
How Populations Grow

... Emigration ...
1 Chapter 4-HB Population Ecology Population growth is a critical
1 Chapter 4-HB Population Ecology Population growth is a critical

... b. __________-number of organisms born in a given time period (birthrate) c. Mortality-number of deaths in a given time period (deathrate) d. Immigration-number of organisms moving into an area e. ______________-number of organisms moving out of an area f. usually immigration=emigration g. Exponenti ...
CH 40 Reading Guide Pop
CH 40 Reading Guide Pop

... 7. Survivorship curves show patterns of survival. In general terms, survivorship curves can be classified into three types. Using the following figure, label and explain the three idealized survivorship patterns. ...
LECTURE OUTLINE
LECTURE OUTLINE

... Age Distributions An age-structure diagram divides the population into three age groups: prereproductive, reproductive, and postreproductive. 33.3 Regulation of Population Growth Members of opportunistic populations are small in size, mature early, and have a short life span. Equilibrium pattern org ...
File - Biggs` Biology
File - Biggs` Biology

... Density dependent limiting factors Death rate rises, or birth rate falls as population density rises.  Example of negative feedback regulation  Includes ...
population growth
population growth

... Types of Population growth: Exponential • If a population has unlimited space and food and no predators and disease, the population will increase exponentially. • Occurs when individuals reproduce at a constant rate. • As more individuals are added to the population, they also reproduce. ...
Population Ecology
Population Ecology

... ________exponential growth___________________________________ occurs when the rate of growth in each new generation is a multiple of the previous generation. ...
Growth rate
Growth rate

... Biotic or Intrinsic factors are specific to each species and include ➢ Age of reproductive maturity ➢ Number of offspring per reproductive event ➢ Number of reproductive events per lifetime ➢ These factors together are referred to as fecundity/fertility. ➢ r strategists (r-selected species) High int ...
Population Growth
Population Growth

... As density increases, intraspecific competition for resources increases, so births decrease and deaths increase. ...
Ecology of Populations
Ecology of Populations

...  Intrinsic Rate of Natural Increase (r) ...
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Populations

...  Ecosystems have limited resources.  Organisms with similar needs must compete to get ...
Envi Sci @ CHS
Envi Sci @ CHS

... 20. What are three (3) risks/problems associated with sexual reproduction? Females have to produce twice as many offspring to maintain the same number of young in the next generation as an asexually reproducing organism  Increased chance of genetic errors when splitting and recombination of chromos ...
chapter9
chapter9

... population would grow at if it had unlimited resources. ...
Chapter 48: Populations and Communities
Chapter 48: Populations and Communities

... When populations become crowded, both plants and animals compete, or struggle, with one another for _________________, __________________, _____________________, ___________________________, and other essentials of life ...
Exponential Growth
Exponential Growth

... Logistic Growth - Growth rates are regulated by internal and external factors until they come into equilibrium with environmental resources. ...
Primary Succession
Primary Succession

... LIMITS TO POPULATION GROWTH: Resources & Competition Biotic potential: capacity for growth Intrinsic rate of increase (r): rate at which a population would grow if it had unlimited resources Environmental resistance: all factors that act to limit the growth of a population Carrying Capacity (K): ma ...
Population size
Population size

... Population (def.) – a group of actively interbreeding individuals Therefore, they’re the same species  Individuals are in the same place at the same time  Groups of the same species can be separated ...
ECOLOGY - Mr. Blankenship's pages
ECOLOGY - Mr. Blankenship's pages

... eventually affects: – birthrate, death rate – emigration (leaving), competition – abundance/scarcity of food, – disease, parasitism, predation – physical space ...
population - Northwest ISD Moodle
population - Northwest ISD Moodle

... Organism Interactions Limit Population Size • Population sizes are limited not only by abiotic factors, but also are controlled by various interactions among organisms that share a community. ...
Chapter 14 Review
Chapter 14 Review

... • There are two types of succession: primary and secondary. • Primary succession is the establishment and development of an ecosystem in an area that was previously uninhabited. • Secondary succession is the reestablishment of a damaged ecosystem in an area where the soil was left intact. ...
2016-2017 Population Growrh and Urbanization
2016-2017 Population Growrh and Urbanization

... supplies keep up with the demands of a growing population. ...
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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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