Biodiversity Within A Community Flashcards
What is species diversity
The number of different species and individuals within each species in a COMMUNITY
What is genetic diversity
The variation of genes amounts all of the individuals in a population of one species
What is species richness
A measure of the number of different species in a community
How does farming reduce biodiversity x5
Destruction of hedgerows
Selective breeding
Monocultures
Over-grazing
Filling in ponds and draining wetlands
What is index diversity
A measure of species diversity. It measures the relationship between number of species in a community and the number of individual in each species
D=N(N-1)/ En(n-1) Index of diversity equation what does each letter mean
N = total number of organisms of all species
n= total number of organisms of a particular species
D= Simpsons diversity index
Why is it bad if farmers only select crops that are productive
Reduced frequency of alleles
One area can only support a certain amount of ….
+ why is this bad
Biomass
Little left for anything else
What is an ecosystem
All the living and non-living components of a particular area
Ecosystems with a high species diversity are more/less stable +why
More
They are more resilient to environmental changes
Why can species richness be misleading
Does not take into account the number of individuals of each species
Why is index of diversity better than species richness
Takes into account the number of individuals of EACH species
So useful because may be few of other species
Give two ways to ensure that index of diversity was representative of each habitat
Random sample
Large sample size
Give three reasons to keep hedgerows
Increase in plant diversity leads to more TYPES of food for animals
Increased in habitat
Increase in variety of animals leads to increase in predator species
Suggest how a student can obtain a more precise value for index of diversity x2
Take more samples and find a mean
Use random sampling E,eg. quadrants and coordinates
