4.6 biodiversity within a community Flashcards
what is biodiversity
variety of different organisms
what is species richness
measure of number of different species in a community
what is index of diversity
numerical way of measuring diversity
formula for index if diversity
N(N-1) / < n(n-1)
N = the total number of organisms of each species
n = the total number of organisms of each species
how can biodiversity be reduced
farming techniques
what is monoculture
when farmers inky grow one type of plant
- only small number of organisms can be supported so biodiversity is reduced
why do herbicides reduce biodiversity
kills weeds - animals that rely on weeds to live coukd die
what do pesticides do
kill insects that eat crops which reduces insenct diversity > birds that feed on them could die
what does removing hedgerows do
creates bigger fields for machinery destroys the habitat of the organisms that live in the hedgerows
what does woodland clearance do
reduces the number of trees and the diversity of tree species while also destroying the habitat of the organisms that live in the woodland
state heirs to conserve biodiversity
- protecting endangered species
- restricting development of some areas by designing them as national parks etc
- provide subsides to farmers to encourage them to reduce biodiversity
