Flashcards in 3.4.6 Biodiversity within a community Deck (19):
The demand for increased food production has led to areas of Heath being used to grow wheat. Explain the effect of this on the species diversity of plants
Reduces the species diversity as there is only one species of crop being grown.
The wheat is a better competitor for light and nutrients
Why might animal species diversity fall in a given area?
1. Reduction in the number of plant species
2. so less VARIETY of food sources
3. also fewer habitats
Explain why it may be more useful to calculate the index of diversity than to record only the number of species present
The index of diversity measures the number of individuals of each species and the number of species
What information is required to calculate an index of diversity for a particular community
Number of a species
Farmers clear tropical forest and grow crops instead. Explain how this causes the diversity in the area to decrease
There is a lower diversity of plants and lower variety of plants
Fewer types of food
What are the 3 components of biodiversity?
What is species richness?
The number of different species in a particular area at a given time in a community
What is a community?
All the populations of different species living in a particular place
What is a population?
All the organisms of one particular species
the variety of living organisms in an area
the place where an organism lives
High biodiversity means...
lots of different species there
What can you calculate as a measure of biodiversity?
index of diversity
Species richness if a measure of....
Which is a better indicator of biodiversity - index of diversity OR species richness?
index of diversity
To calculate index of diversity what do you need to know?
total number of ALL species
total number of each species
How can you reduce biodiversity?
1. clear trees
2. remove hedges
Why might animal diversity increase?
1. Increase in the number of plant species
2. so more VARIETY of food sources
3. also more habitats