Population And Sustainability Flashcards
what is population
al the members of a single species which live in the same area
explain and draw the population growth curve
- phase 1 slow growth
- rapid growth
- stable state
check notes or textbook
what is carrying capacity
maximum population size of a biological species which can be sustained in that specific environment
limiting factors
these prevent further gorth of a population,
abiotic and biotic factprs
migration also affects population size,
immigration and emigration
what are density independent factors
these are factors which affect population regardless of the size e,g earthquakes
what is competition a typeof factor
biotic
what are the twoo types of competition and explain
intraspecific
competition between different species
interspecific
competition between members of the same species
what is the competitive exclusion principle
( INTERSPECIFIC COMPETITION)
2 species competing for the same limited resource one species uses the resource more effectively eventually eliminating the other
predator prey relationship graph
check textbook
what is conservation
the maintenance of biodiversity through human activity
what is preservation
the protection of an ecosystem
what are the importance of conservation
Economic – areas of natural beauty attract tourists, which bring money to the region. Areas of high biodiversity provide resources including drugs, food and building materials.
Social – biodiverse areas look good, and are important for our mental health
Ethical – we have a moral responsibility to ensure that other species don’t become extinct, as they have as much right to survive as we do
what is sustainability
ensuring enough resources are available to meet the demands of sustainable resources today and for the future
what are sustainable resources
renewable resources which has economically exploited in a way that it will not run out or diminish
what are the aims of sustainability
- preserve the environment
- ensure resources are available for future generations
- allow humans to live comfortably
- enables LEDC’S to develop
- creates a more even balance between MEDC’s and LEDC’S
Small scale timber production
uses a technique called coppicing this is when a tree trunk is cut close to the ground and new shoots form from the surface and mature, these shoots are cut and more are produced
large scale timber production
timber companies will practice selective cuttings
replace trees by replanting
plant trees at distances to reduce competition
manage pest and pathogens to maximise yields
ensure areas of forests remain for indigenous people
conserving marine life
Fishing quotas – to limit the amount of fish that fishermen are allowed to catch.
Controlling mesh size – nets with a small mesh increases the amount of by-catch (the unwanted fish that are accidentally caught). Using nets with bigger holes will allow small by-catch and young fish that are too small to sell to slip out of the net.
case studiess
masai mara
terai regions of nepal
peat bogs
environmentally sensitive ecosystems
