Extinction..

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  • Created by: exam yes
  • Created on: 13-05-19 21:11
What are the 4 major factors that leads to species vulnerability?
Small Population size, Specialisation, Low density Populations and animals in high tropic levels
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What is the definition for Functional Extinction ?
Permanent genetic reproductive failure
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What is extirpation?
Local extinction - species are extinct in a specific geographic area but exist elsewhere...
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What is Background Extinction? - describe it
Natural extinctions that are inevitable and continuous. It is described as the normal background extinction rate that can be seen in the fossil record...
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What is the definition of Mass Extinctions?
Extinction of the majority of plants and animals (50%) caused by a widespread event and are said to occur every 65 million years...
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Describe the major extinction after the Permian 250 million years ago...
Saw 96% of all marine organisms extinct.. Caused by the eruption of the Siberian Traps and ocean current change leading to changes in the climate affecting marine life
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Describe the major extinction that occurred 65 mya between the Cretaceous and Triassic periods...
The K-T boundary saw the extinction of the dinosaurs and 2/3 of other species... Was caused by a meteor leading to huge climate change (decrease in photosynthesis), as well as eruption of the Deccan Traps in India...
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What is the current rate of extinction as it exists in the Anthropocene?
In our current in our current geological time (Anthropocene), the rate of extinction is 100-1000 times more than the background rate
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Which reference is linked with the 100-1000 more than background rate?
Groom et al, 2006
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What is Environmental stochasticit, and give examples of how this affects extinction?
Unpredictable change in environmental conditions. This may contribute to the extinction of species due to climate change, changing sea levels or light differences- affecting photosynthesis
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What are the three processes connected to Genetic stochasticity ?
Genetic Drift, Founder effect and Bottlenecks
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How does high genetic variation limit the effects of genetic stochasticity in association with extinction?
High genetically diverse populations have a greater ability to adapt to change and survive a selective pressure or respond to any catastrophic event - In theory there will be a larger gene pool + more chance of different advantageous alleles to exist
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What is inbreeding depression and how may it occur?
Breeding between common ancestors or related individuals perhaps due to a small population size or if a population becomes isolated... Resulting in deficiencies and decreased genetic/mental fitness.
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What does PVA stand for and briefly describe it...
Population Viability Analysis - Measuring a species population and then create models and simulations to try and predict when they might go extinct (MORE)
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What date did were the wolves extinguished from Britain due to humans?
1680
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Other cards in this set

Card 2

Front

What is the definition for Functional Extinction ?

Back

Permanent genetic reproductive failure

Card 3

Front

What is extirpation?

Back

Preview of the front of card 3

Card 4

Front

What is Background Extinction? - describe it

Back

Preview of the front of card 4

Card 5

Front

What is the definition of Mass Extinctions?

Back

Preview of the front of card 5
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