Biodiversity

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  • Created by: Kate Fish
  • Created on: 20-04-18 16:50
What is biodiversity
Halia & Kouki (1994) “Biodiversity is a complex term that describes variability among living organisms at different ecological levels which are a fundamental property of natural systems” - The diversity of species - The diversity of their genes, phys
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How do you measure biodiversity?
• Visual observations • Camera/pit fall • Simpsons index of biodiversity • Allee effect • MHC
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What factors affect biodiversity?
• Altitude • Depth • Productivity • Age of environment • Climatic variability • Harshness • Isolation • Islands • Heterogeneity (greater heterogeneity leads to increased species richness)
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What are some threats to biodiversity?
• Population overgrowth • Habitat loss • Invasive species • Exploitation • Disease • Pollution/climate change
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What affects a species 'richness' in an area?
Predation, competition, niche seperation
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What is a keystone species?
Often a dominant predator whose removal allows a prey population to explode and often decreases diversity. Other species can also include coral or beavers that significantly alter the habitat around them, thus affecting large numbers of other species
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Name a positive and negative of IN-SITU conservation?
Ecotourism benefits Mountain gorillas (Gorilla beringei beringei). Ecotourism affects the mountain gazelle (Gazella gazella).
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Name a positive and negative of EX-SITU conservation?
Controlled environments and genetic management, along with possibilities of re-introduction. Not always ethically acceptable to ‘cage’ wild animals. Some species are best preserved in their natural habitat. Example: Polar bears (Ursus marmitimus)
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What are hotspots?
A biogeographic region that is both a significant reservoir of biodiversity and is threatened with destruction. Specifically refers to 25 biologically rich areas around the world that have lost at least 70% of their original habitat.
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What is Megadiversity?
Extreme biodiversity found in a small number of countries worldwide. Most megadiversity is found in tropical regions of the world.
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What is Island Biogeography?
The factors that affect species richness in isolated natural communities. Types of islands include oceanic and volcanic, continental and former land bridge. 3 important processes include: immigration, colonisation and extinction.
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Card 2

Front

How do you measure biodiversity?

Back

• Visual observations • Camera/pit fall • Simpsons index of biodiversity • Allee effect • MHC

Card 3

Front

What factors affect biodiversity?

Back

Preview of the front of card 3

Card 4

Front

What are some threats to biodiversity?

Back

Preview of the front of card 4

Card 5

Front

What affects a species 'richness' in an area?

Back

Preview of the front of card 5
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