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© Boardworks Ltd of 25
© Boardworks Ltd of 25
© Boardworks Ltd of 25 A population is the number of individuals of the same species living in a certain habitat. What is the difference between a population and a community? What is a population? A community includes all the different species living in a certain area.
© Boardworks Ltd of 25 What is a population? The size of the population within a community can change over time. What factors will affect population size? competition predators disease migration
© Boardworks Ltd of 25 Competition occurs between different species… Competition is one of the factors that affects population sizes. What type of organisms compete for resources? What is competition?
© Boardworks Ltd of 25 Why do living things need to compete, and for what do they compete? Members of the same species also compete for resources. Why do animals compete?
© Boardworks Ltd of 25 What four things do animals have to compete for? What do organisms compete for? food mates water space
© Boardworks Ltd of 25 What four things do plants have to compete for? What do organisms compete for? light minerals water space
© Boardworks Ltd of 25 What happens if animals within a community have overlapping niches? A niche is the position that an organism occupies in a community. Niche competition Animals with overlapping niches compete. The greater the overlap between niches, the greater the amount of competition between the species. A niche organism has a specialized type of lifestyle.
© Boardworks Ltd of 25 What three things might happen to the less competitive species? If species compete for all aspects of their niches, one species will better the other. become extinct in that area. move to another area adopt new survival strategies Competition losers Competition results in winners and losers.
© Boardworks Ltd of 25 Competition in the meadow
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© Boardworks Ltd of 25 A predator is an animal that hunts and kills other animals for food. A prey animal is one that is attacked and eaten by a predator. Predators can be either: Animals that eat other animals carnivorous (eat meat only) e.g. wolves omnivorous (eat meat and vegetation) e.g. humans.
© Boardworks Ltd of 25 Predators are adapted to hunting, catching and eating prey. Prey are adapted to detecting and fleeing predators. Predator and prey adaptations
© Boardworks Ltd of 25 The snowshoe hare lives in northern parts of North America. How is it adapted to avoid predators such as lynxes? large furry feet act as snow shoes and protect the soles from cold large ears help in detecting predators greyish-brown fur turns white in winter for camouflage strong teeth for chewing bark and twigs Prey adaptations
© Boardworks Ltd of 25 How are lynxes adapted for catching snowshoe hares? very strong hind leg muscles capable of pouncing 6.5 metres! extra large paws act as snow shoes excellent eyesight and hearing, and very sharp teeth! warm thick furry coat protects from the cold Predator adaptations sharp claws for puncturing flesh
© Boardworks Ltd of 25 This population data comes from fur trapping records. How are the populations linked? Predator-prey populations 0 50 estimated population size (thousands) year lynx snowshoe hare
© Boardworks Ltd of 25 How does the lynx population depend on the number of snowshoe hares? Predator-prey populations 0 50 estimated population size (thousands) year lynx snowshoe hare Take a closer look at this part of the graph.
© Boardworks Ltd of Why does the peak for the lynx population always come after the peak for the number of snowshoe hares? Predator-prey populations 0 50 estimated population size (thousands) year lynx snowshoe hare For the populations to survive, there must always be more hares than lynxes
© Boardworks Ltd of 25 Predator and prey population sizes follow a cycle. What happens if the prey population increases? Predator-prey cycle normal prey population prey population increases prey population decreases because of more predators prey population increases predator population increases because of more food predator population decreases because of less food
© Boardworks Ltd of 25 Predator and prey population sizes follow a cycle. What happens if the prey population decreases? Predator-prey cycle normal prey population prey population decreases prey population increases because of fewer predators prey population decreases predator population increases because of more food predator population decreases because of less food
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© Boardworks Ltd of 25 Glossary competition – The struggle for resources between individuals of the same or different species. community – All the different types of species within a specific area. niche – The position that an organism occupies in a community. population – The number of one particular species within a specific area. predator – An animal that hunts and kills other animals for food. prey – An animal that is killed and eaten by another animal.
© Boardworks Ltd of 25 Anagrams
© Boardworks Ltd of 25 Multiple-choice quiz
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