Populations
the parts of the Earth and the surrounding atmosphere
the biosphere
the number of offspring produced over a given time period
birthrate
organisms that cannot make their own food are called
consumers
What are 3 types of symbiotic relationships?
mutualism, commensalism, parasitism
all the organisms of the same species that live in the same area
population
the demand for resources, such as food, water and shelter
competition
What are 3 causes of extinction?
predation, natural disasters, damage to the environment
detritivores
What limiting factor is being displayed when a fox chases after a rabbit?
predation
Name 2 resources that populations might compete for.
food, water or shelter
What is the difference between endangered and threatened species?
Endangered species are at risk of extinction, while threatened species is at risk but not yet at the point of being endangered
What level of an energy pyramid is the most energy available?
the bottom level
Which type of symbiotic relationship does one organism benefit and the other is neither helped nor harmed?
commensalism
A sedated Florida panther is fitted with a radio collar and then returned to the wild. What is the name of the method use to measure population size?
capture-mark-release
anything that restricts the size of a population
limiting factor
How do natural disasters affect people's well-being?
People may lose their homes or unable to live in an area for a long time.
Predators capture weak and injured individuals. This can help to keep the remaining prey population healthy because more resources are available for the remaining members.
What might happen to a population of snakes if their main food source were to lose access to food and water?
The number of snakes would decrease
the largest number of individuals of one species that an environment can support
carrying capacity
How can carrying capacity change?
It can either increase or decrease if available resources increase or decrease.
What are 4 reasons a population might decrease in size?
lack of resources such as food, natural disasters, disease and predation
What is a symbiotic relationship?
A close relationship between 2 or more organisms of different species that live in direct contact.
What are key factors that affect population size?
competition for resources, food, water, overpopulation
What might happen to animals and plants that live in an ecosystem with forests and grasses if that area is cleared for a parking lot?
reduction of food and shelter, animal population would decrease