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LGS A-Level OCR Biology - Unit 4 - Biodiversity Part 3

Biology25 CardsCreated about 1 month ago

A flashcard deck covering key concepts from biodiversity sampling methods, animal and plant sampling techniques, biotic factors, environmental measurements, and methods to determine species richness and evenness.

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When would random sampling be useful?

If the study is only looking at biodiversity in one area
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Key Terms

Term
Definition
When would random sampling be useful?
If the study is only looking at biodiversity in one area
List 5 methods of sampling animals.
using pooters, sweep nets, pitfall traps, tree beating, kick sampling
What kind of animals are sampled using a pooter?
Small insects
What kind of animals are sampled using sweep nets?
Insects, particularly those that live in long grassland
What kind of animals are sampled using pitfall traps?
Small crawling invertebrates
What kind of animals are sampled using tree beating?
Invertebrates which live in trees/bushes
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LGS A-Level OCR Biology - Unit 4 - Biodiversity Part 3
TermDefinition
When would random sampling be useful?
If the study is only looking at biodiversity in one area
List 5 methods of sampling animals.
using pooters, sweep nets, pitfall traps, tree beating, kick sampling
What kind of animals are sampled using a pooter?
Small insects
What kind of animals are sampled using sweep nets?
Insects, particularly those that live in long grassland
What kind of animals are sampled using pitfall traps?
Small crawling invertebrates
What kind of animals are sampled using tree beating?
Invertebrates which live in trees/bushes
What kind of animals are sampled using kick sampling?
Animals which inhabit river beds
Describe how pooters can be used to sample animals.
By sucking on a mouthpiece insects are drawn into the holding chamber
Describe how pitfall traps can be used to sample animals.
a hole is dug and insects fall in; this is left overnight so nocturnal species are also sampled
Why must a pitfall trap have a roof structure?
To prevent the hole filling with rainwater
Describe how tree beating can be used to sample animals.
a large white cloth is stretched out under the tree; the tree is then shaken/beaten; animals fall onto the sheet where they can be collected
Describe how kick sampling can be used to sample animals.
the riverbank and bed are kicked to disturb substrate; a net is held downstream to capture organisms that have been disturbed
List the 2 ways plants can be sampled.
frame quadrats, point quadrats
Define biotic factor.
The living components of an ecosystem
List 3 ways frame quadrats can be used to sample plants.
Frame quadrats can be used to generate data on: density, % cover, frequency
What is used to measure wind?
Anemometer
What is used to measure Oxygen content in water?
Dissolved O2 probe
Why would a temperature probe linked to a data logger be advantageous over a thermometer?
rapid changes can be detected; human error in taking reading reduced; high degree of precision can be achieved; data can be stored and tracked on a computer
List the 2 ways of measuring biodiversity.
Species richness, Species evenness
What is species richness?
A measure of the number of different species living in an area
What is species evenness?
How close in number the populations of each species in an environment are
What information is required to determine species evenness?
Number of each species in an area
What information is required to determine species richness?
Total number of species present
How can population size of a plant population be estimated?
Through the use of frame quadrats to find density or frequency
How can the size of an animal population be determined?
Mark-release-recapture