SNAB Biology topic 4 checklist

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  • Created on: 19-03-13 13:25
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A group of organisms with similar morphology, physiology and behaviour, which can interbreed to produce fertile offspring, and which are
reproductively isolated (in Place, time or behaviour) from other species.
Ecosystem: A system that includes all living organisms in an area as well as its physical environment functioning together as a unit.
Habitat: a place where an organism lives.
Microhabitat: small part of a habitat.
Community: all the populations of organisms in a habitat.
Population: a group of organisms of the same species, living and breathing together in a habitat (or part of it)
The specific space that a species will occupy and the way it uses its environment.
Different niches avoid competition ­ if two species occupy the same niche they will compete with each other .The better adapted organisms
will out-compete the other and exclude it from the habitat, e.g. this happened to the red squirrel when the grey squirrel was introduced.
Behavioural adaptations: any actions by organism which help them to survive or reproduce. For example:
When agoutis bury Brazil nuts, this is a behaviour which will aid their survival by providing a future food source.
The Costa Rica palm, Socratea durissima, has stilt like roots which grow towards a sunny patch and slowly pull the whole tree towards

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Physiological adaptations: features of the internal workings of organisms which help them to survive or reproduce. For example:
Danish scurvy grass, has spread inland with the increasing use of salt on icy roads, the plant has a physiological adaptation allowing it
to tolerate high salt concentration. Therefore it is able to occupy a newly created niche unavailable to other inland plants.
Thermophilous bacteria can tolerate the highest temperatures of any organism, found in thermal vents deep in the ocean.…read more


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