biodiversity Flashcards
species richness vs evenness
species richness is the number of species present
species evennes is the abundance of each species present
Both are needed to reveal dominance .
high biodiversity is associated with high richness and eveness.
low simpsons index means
habitat is dominated by one species
so habitat is unstable
whys it sometimes important to conserve plant species ex situ
natural habitat is destroyed due to climate change
population is very small
reproduction is difficult in the wild
breeding ex situ maintains gene poole
conserving seeds pros
take up little space
lower maintenence
easier to transport
remain viable for long periods of time
why are estimates not accurate
may have become extinct recently
new species are being formed
some species are difficult to distinguish
biodiversity
the variety of species
the variety of habitats
what must be thought about before building
size of development
what species are present
potential damage to area
CITES-convention on international trade in endangered species
RIO convention
cites regulate trade in endangered species
ensure trade doesnt endanger wild species
allow trade in less endangered species
rio makes sustainable use of organisms
share genetic resources
promote ex situ conservation methods
how do organic factors improve yield of plants
broken down by decomposers
add npk
nitrogen for protein
if no nitrogen then growth is limited
how does excessive use of fertilliser reduce biodiversuty
as it promotes growth for only one plant
other plant species are out competed
so food chains are disrupted
soil quality is reduced over time
benefits to agriculture for maintaining biodiversity
genetic variation genes can be useful
used for selective breeding
source of new medicine
used for genetic engineering
how to determine effect of varying moisture on plants
grow it in a range of water content
leave all for the same mount of time
measure height and calculate mean
keep temperature and soil ph the same
unbiased sample method to measure biodiversity of grassland
use quadrats
place tape measures at 90 degrees angles
use a random number generator so that you can generate coordinates and place coordinates
repeat many times
sample at different times of year
species
a group of organisms that are able to produce fertile offspring
