Term
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Definition
| The number of organisms per unit area Ex: 10 mice per square meter |
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Term
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Definition
| The pattern of spacing of a population within an area |
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Term
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Definition
| Organisms have an equal amount of space separating one individual from another |
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Term
| Examples of uniform distribution |
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Definition
| Bears, plants in the desert, nesting penguins |
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Term
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Definition
| Organisms live in small groups, close together |
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Term
| Examples of clumped distribution |
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Definition
| Herds of cattle, schools or fish, colonies of birds, insect hives |
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Term
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Definition
| Organisms are dispersed with no noticeable pattern |
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Term
| Examples of Random distribution |
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Definition
| Deer in woodland habitats, dandelion weeds |
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Term
| Density-independent limiting factor |
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Definition
| Any factor in the environment that does not depend on the number of members in a population per unit area |
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Term
| Examples of density-independent factors |
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Definition
| Usually abiotic factors such as floods, hurricanes, drought, extreme heat or cold. Think of events that will occur whether or not many organisms are there. |
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Term
| Density-dependent limiting factors |
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Definition
| An factor in the environment that depends on the number of members in a population per unit area |
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Term
| Examples of density-dependent factors |
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Definition
| They are usually biotic and include predation, disease, parasites, competition for food, water, nesting sites, etc. |
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Term
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Definition
| Explains how fast a population is growing |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| The number of individuals who move into an population |
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Term
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Definition
| The number of individuals who leave an population |
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Term
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Definition
| A model that shows a population with low numbers which suddenly increases very dramatically |
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Term
| What do we call organisms that show exponential growth? |
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Definition
| They are r-strategists. They show r-selected growth where r represents the rate of growth |
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Term
| Name examples of r-selected populations |
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Definition
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Term
| What are features of r-selected life styles? |
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Definition
| Early reproductive age, many rounds of reproduction, many offspring born at the same time, little parental care |
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Term
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Definition
| This model shows a population with a low rate of growth that increases rapidly and then reaches a stable number |
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Term
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Definition
| The maximum number of organisms that an ecosystem can support; a feature of logistic growth |
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Term
| What do we call organisms that show logistic growth |
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Definition
| K selected population or K strategists where K stands for the carrying capacity |
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Term
| Name examples of K selected populations |
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Definition
| Large animals like humans, horses, cows, elephants |
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Term
| What are features of K-selected life styles? |
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Definition
| Late age of first reproduction, fewer reproductive events, one or two offspring born at the same time, much parental care |
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Term
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Definition
| The early period of growth of a population where the numbers of individuals increase very slowly because the population numbers are low |
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