5Boardworks GCSE Science: Biology Competition What is competition?Boardworks GCSE Science: BiologyCompetitionCompetition is one of the factors that affects population sizes. What type of organisms compete for resources?Competition occurs between different species…
6Boardworks GCSE Science: Biology Competition Why do animals compete?Boardworks GCSE Science: BiologyCompetitionMembers of the same species also compete for resources.Why do living things need to compete, and for what do they compete?
10Boardworks GCSE Science: Biology Competition Competition losersBoardworks GCSE Science: BiologyCompetitionIf species compete for all aspects of their niches, one species will better the other.Competition results in winners and losers.What three things might happen to the less competitive species?move to another areaadopt new survival strategiesbecome extinct in that area.
11Competition in the meadow Boardworks GCSE Science: BiologyCompetition
15Boardworks GCSE Science: Biology Competition Prey adaptationsBoardworks GCSE Science: BiologyCompetitionThe snowshoe hare lives in northern parts of North America. How is it adapted to avoid predators such as lynxes?greyish-brown fur turns white in winter for camouflagelarge ears help in detecting predatorsstrong teeth for chewing bark and twigslarge furry feet act as snow shoes and protect the soles from cold
16Boardworks GCSE Science: Biology Competition Predator adaptationsBoardworks GCSE Science: BiologyCompetitionHow are lynxes adapted for catching snowshoe hares?excellent eyesight and hearing, and very sharp teeth!warm thick furry coat protects from the coldvery strong hind leg muscles capable of pouncing 6.5 metres!sharp claws for puncturing fleshextra large paws act as snow shoes
17Predator-prey populations Boardworks GCSE Science: BiologyCompetitionThis population data comes from fur trapping records.How are the populations linked?50estimated population size (thousands)180018201840186018801900100150yearlynxsnowshoehare
18Predator-prey populations Boardworks GCSE Science: BiologyCompetitionHow does the lynx population depend on the number of snowshoe hares?50estimated population size (thousands)180018201840186018801900100150yearlynxsnowshoehareTake a closerlook at this partof the graph.
19Predator-prey populations Boardworks GCSE Science: BiologyCompetitionWhy does the peak for the lynx population always come after the peak for the number of snowshoe hares?snowshoehare150lynxFor the populationsto survive, there must always be more hares than lynxes100estimated population size (thousands)5018451850185518601865year
20Boardworks GCSE Science: Biology Competition Predator-prey cycleBoardworks GCSE Science: BiologyCompetitionPredator and prey population sizes follow a cycle.What happens if the prey population increases?prey populationincreasesprey populationincreasesnormal prey populationpredator population decreases because of less foodpredator population increases because of more foodprey population decreasesbecause of more predators
21Boardworks GCSE Science: Biology Competition Predator-prey cycleBoardworks GCSE Science: BiologyCompetitionPredator and prey population sizes follow a cycle.What happens if the prey population decreases?prey populationdecreasesprey populationdecreasesnormal prey populationpredator population decreases because of less foodpredator population increases because of more foodprey population increasesbecause of fewer predators
23Glossarycompetition – 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.