Biodiversity: Patterns & Threats Flashcards Preview

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Flashcards in Biodiversity: Patterns & Threats Deck (14)
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1

biodiversity

life diversity
- levels: genetic diversity, species diversity & ecosystem diversity

2

genetic diversity

genes or alleles diversity in a population, species, or group of species

3

species diversity

variety & relative abundance of the species present in a given ecological community

4

ecosystem diversity

variety of biotic components in a region along w/ abiotic components

(ie) soil, water & nutrients

5

ecosystem function

sum of biological & chemical processes that are characteristic of a given ecosystem

(ie) primary production, nitrogen cycling & carbon storage

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endemic species

species that lives in one geographic area & nowhere else

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biodiversity hot spot

region rich in species

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endangered species

species whose #s have decreased so much that it is in danger of extinction throughout all or part of its range

9

habitat destruction

human-caused destruction of a natural habitat
- replaced by an urban, suburban, or agricultural landscape

10

habitat degradation

reduction of habitat quality

11

habitat fragmentation

breakup of a large region of a habitat into smaller regions, separated from others by a different habitat

12

biomass

total mass of all orgs in a given population or geographical area
- usually expressed as total dry weight

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overexploitation

unsustainable removal of wildlife from natural environment for human use

14

species-area relationships

mathematical relationship btwn area of a certain habitat & number of species that it can support