ess 3 Flashcards
(23 cards)
biodiversity
variation of habitats, species and genes within an area
genetic diversity
variation of genes within a species
species diversity
variation of species within an area
habitat diversity
variety of places where life exists within a location
hotspots
region with high levels of biodiversity under threat from human activity
speciation
formation of new species from natural selection.
natural selection
species with more favarouble genetics breed
isolation
species get separated - physical barriers (mountains, canyons)
factors to maintain biodiversity
complex ecosystems
succession
factors leading to loss of biodiversity
natural hazards
over exploitation
diseases
what makes a species prone to extinction
low reproduction rates
vulnerability
endangered
e.g - black rhinos - wanted for materials - habitat loss
CITES
treaty to protect endangered species
IUCN
international union for for conservation of nature - gives information of endangered species for conservation
extinct species example
DODO
- easy prey couldn’t fly
- humans destroyed habitats
- captured - weren’t scared of humans
endangered species
OTTER
- tourism value - economic value
flagship species
easily recognisable species by characteristics
- giant panda
keystone species
sea urchins and otters
- plays an important role in an ecosystem and if take out can collapse
biomes
collection of ecosystems that share climatic conditions
succession
change in species composition
productivity
conversion of energy into biomass
biotic factors
animals, plants, food
abiotic factors
wind, temperature, light
Lincoln index
capture, mark, release, recapture
- formula = population first capture x population of second / total marked
