B2 Interdependene
- Created by: Spanish
- Created on: 03-05-16 18:59
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- Independence
- Competition
- Similar organisms living in the same habitat compete with each other for resources
- If they are members of the same species they will also compete with each other for mates so they can breed
- An ecological niche describes the habitat that an organism lives in and also its role in the habitat. For example, ladybirds live on trees and eat greenfly
- Organisms that share similar niches are more likely to compete, as they require the same resources
- Competition can be intraspecific or interspecific
- Intersepcific is between organisms of different species
- Intraspecific is between organisms of the same species and is likely to be more significant as the organisms share more similarities and so need the same resources
- Similar organisms living in the same habitat compete with each other for resources
- Predator-prey relationships
- The predator peaks occur soon after the prey peaks. This is because it takes a little while for the increased supply of food to allow more predators to survive and reproduce
- Parasitism and mutualism
- As well as competing with each other or eating each other, organisms of different species can also be dependent on each other in other ways.
- Parasites feed on or in another living organism called the host
- The host suffers as a result of the relationship
- Sometimes both organisms benefit from their relationship, this is called mutualism
- Pea plants and certain types of bacteria benefit from mutualism. Pea plants are legumes with structures on the roots called nodules. In these nodules live nitrogen-fixing bcteria
- The bacteria turn nitrogen into nitrogen-containing chemicals and give some to the pea
- The pea plant gives the bacteria some sugars that have been produced by photosynthesis
- Pea plants and certain types of bacteria benefit from mutualism. Pea plants are legumes with structures on the roots called nodules. In these nodules live nitrogen-fixing bcteria
- Competition
- Both predator and prey show cyclical changes in their numbers, because:
- When there are lots of prey, more predators survive and so their numbers increase
- More predators starve and so their numbers drop
- Predator-prey relationships
- The predator peaks occur soon after the prey peaks. This is because it takes a little while for the increased supply of food to allow more predators to survive and reproduce
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