biodiversity Flashcards
biodiversity refers to
species richness
index of diversity
mathematical measure of species
formula : total number of diffspecies divided by
total number of living organsim
alvarez- index help us compare species of different richness habitats
high vs low index
high- willl be able to withstand environmental changes better than few species/ index
population meaning
group of organism in the same species and the same geographic area
may be differ when it comes to density
density of pop
number of indivi per unit area
limitng factors
anything taht limits the size (increase/ decrease)
regulate the balance in an ecosystem (food, water)
max capacity
maximum pop size the envi can support
if reached beyond organism will die
extinctiona and its types
when its last memeber dies
mass
widespread and rapid decrease
background
normal/natural extinction
b4 humans
IUCN
internation union for conservation of nature
assesment of the conservation status
3 criteria
extinct, threathened, low risk
exticnt categ
extinct - no knon indivi remains
extinct in the wild - only bred in captivity
threathend categ
critically- exetremely high risk of extinction
endangered- high risk of extinction
vulnerable-
low risk categ
conservation dependent- in need of conservation effrot
near threathened– most likely to become endangered
least concern - species still populous
