Biodiversity Flashcards

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1
Q

definition: Biodiversity

A

number and variety of species in a particular area

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2
Q

extreme environment

A

less biodiversity= unstable ecosystem=dominated by abiotic factors (temp, wind, soil type)

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3
Q

less hostile environments

A

more biodiversity= stable ecosystem= biotic factors (disease, competition, predation)

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4
Q

succession

A

-gradual change in composition of a community over time
-pioneer species -> first to colonise ( bare sand) -> survive hostile environments
Does this by (adding moisture, more stable and more nutrients)
-other species can then colonise

diversity of plant species increase

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5
Q

human influence

A

human activity= less hospitable environment
(deforestation, climate change, over-fishing, pollution)

fossil record-> most species extinct
extinction=
change in climate/habitat, increased competition, new predators

extinction= natural process

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6
Q

species richness and eveness

A

species richness
-number of species found in a habitat

species eveness
-measure of abundance of individuals in each species

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7
Q

low species diversity

A
  • few well adapted species
  • simple food webs
  • change in environment have serious effects
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8
Q

high species diversity

A
  • more stable ecosystem
  • less hostile (more ecological niches)
  • complex food webs
  • change less damaging to the system
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