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Summary SNAB A level Biology Topic 5 : On the Wild Side Specification notes
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🍃Topic 5 : ON THE WILD SIDE
5.1 : Understand the terms ecosystem , community population and habitat
Ecosystem Meaning
All living organisms found in one area , combined with non living aspects of
their environment
Community meaning
All different species that live in one area and interact with each other
Population meaning
All of the individuals of a species that live in the same habitat at a given
time
Habitat meaning
The place where an organism lives in its ecoystsem
5.2 : Understand that the numbers and distribution of organisms in a habitat are
controlled by biotic and abiotic factors.
What are biotic factors and examples
Living aspects of an ecosystem like predators
What are abiotic factors and examples
Non living aspects of an ecosystem like soil pH and temperature
What is a niche
The role of an organism within its environment
5.3 : Understand how the concept of niche accounts for distribution and abundance
of organisms in a habitat.
How does niche affect the abundance and distribution of organism in a habitat
Topic 5 : ON THE WILD SIDE 1
, If two species have the same role there is interspecific competition which
excludes one species or the niche is divided according to adaptations
5.4: Understand the stages of succession from colonisation to climax community
What is stages of primary succession
Primary succession occurs when there is no life in environment and the
environment becomes colonised
Pioneer species is able to survive in harsh conditions and first to colonise
Pioneer species dies and improves abiotic factors eg soil conditions in the
environment
The greater the decomposition the better the soil nutrient levels
This allows smaller organisms to survive and grow these species
outcompete the pioneer species
Once the smaller organisms die and decompose the soil becomes better
adapted and larger organisms such as trees can grow in the environment
They outcompete the smaller more complex organisms for space and light
and prosper and grow
Reach a climax community
What is a climax community
A stable community that in a dynamic equilibrium and usually contains a
dominating species
Primary Succession in sand dunes
Primary succession in glaciers
Bare rock is the environment
Algae and Lichens are pioneer species first to colonise
Break down and decompose to increase humus content which improves
soil
Topic 5 : ON THE WILD SIDE 2
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