Term
| What do we call the study of why populations change and what causes them to change? |
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Definition
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Term
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Definition
| the maximum number of individuals an ecosystem can support |
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Term
| What do we call a measure of the individuals in a certain space at a particular time? |
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Definition
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Term
| What are the three stages of change that populations go through? |
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Definition
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Term
| What are the three resources that all living things need? |
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Definition
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Term
| If the size of a population in an area decreases, then the density does what? |
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Definition
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Term
| What is the formula for tracking population change? |
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Definition
population change =
(birth+immigration)-(death+emigration) |
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Term
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Definition
| the movement of individuals into a population |
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Term
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Definition
| the movement of individuals out of a population |
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Term
| A factor that prevents the continuing growth of a population in an ecosystem is called what? |
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Definition
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Term
| Name three non-living factors that prevents population growth (limiting factors) |
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Definition
air (oxygen)
water
light
temperature |
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Term
| What do we call a limiting factor that affects a population when density is high? |
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Definition
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Term
| Give me two examples of a density-dependent factor. |
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Definition
disease
competition (for food, water, space)
parasitism
predation (predators) |
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Term
| What do we call a limiting factor that affects a population whether density is high or low? |
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Definition
| density-independent factor |
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Term
| List three examples of a density-independent factor. |
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Definition
wildfires
floods
tornados
drought
freezing temperatures
earthquakes |
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Term
| What do we call species that reproduce rapidly if their population falls below carrying capacity? |
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Definition
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Term
| What do we call species that allow them to remain at or near carrying capacity for long periods of time? |
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Definition
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Term
| List 3 examples of organisms that are opportunists. |
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Definition
insects
dandelions
bacteria
algae |
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Term
| List three examples of organisms that are competitors. |
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Definition
wolves
humans
bears
elephants |
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Term
| The addition of harmful substances to the environment is called what? |
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Definition
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Term
| List two ways that human population growth can reduce populations or cause them to become extinct? |
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Definition
pollution
overfishing/overhunting
introducing new species into a population
destroying habitats |
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Term
| List four things that scientists look at when a population changes? |
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Definition
birth rate
death rate
immigration
emigration
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Term
| Non-living things that effect populations in an ecosystem are called ______________ factors. |
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Definition
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Term
| Living things that effect populations in an ecosystem are called ___________ factors. |
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Definition
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Term
| A field has lots of ants and wild flowers growing in it but that same field can only support 5 deer. Does the field have a high carrying capacity or low carrying capacity for for ants? |
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Definition
high carrying capacity
The field can support a lot of ants with food, water, and space |
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Term
| Explain one thing that might happen if a population of fish in a pond would go beyond the carrying capacity of that pond? |
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Definition
The fish could start to compete by fighting with one another.
They could run low on food and start to starve to death.
Diseases could start to spread from fish to fish because they are too close together. |
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Term
| A death rate that is higher than the birth rate could lead to what? |
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Definition
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Term
In 2019, a hive of honey bees had 250 bees. In 2020, 55 new bees were born in the hive and 32 new bees moved into the hive. Also, there were 40 bees from the hive that died and 66 bees left the hive for good.
What was the population of bees in 2020?
What was the population change of bees from 2019 to 2020? |
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Definition
population change =
(birth + immigration) - (death + emigration)
(55 + 32) - (40 + 66)
87 - 106
= -19
There was a loss of 19 bees in the hive between 2019 and 2020
250 - 19 = 231 total bees in the hive in 2020 |
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