ecosystem dynamics - human impact on biodiversity & ecosystem

Question 1

human activities

Answer 1

-affect biodiversity and impact on the magnitude, duration and speed of ecosystem change
-alter trophic structures, energy flow, cycling of matter and biodiversity
-fire regimes, habitat destruction, invasive animal introduction, and spread of diseases
-decrease biodiversity, increase rate of extinction

Question 2

stable ecosystem

Answer 2

-can be sustained over long periods of time
-a sign of this is being able to sustain stress in the form of extreme conditions, e.g. floods, droughts invasive species, disease & overexploitation; showing resilience

Question 3

agricultural revolution

Answer 3

-increase in human population
-increase in food consumption
-increase in human impact

Question 4

industrial revolution

Answer 4

-increase in human population
-increase in fuel usage (wood then coal)
-increase in human impact

Question 5

machines & technology

Answer 5

-increase in human population
-increase in knowledge and life expectancy
-increase in human impact

Question 6

conservation strategies

Answer 6

-bush heritage buys
-managing land in partnership with indigenous peoples
-actively protecting native species by controlling competitor pests
-revegetating area with native plants
-maintaining/increase biodiversity, decrease rate of extinction
-strategies involve genetic/environmental/management plans

Question 7

wetlands

Answer 7

-high number of different species of plants & animals
-provides necessary resources for wildlife
-merger of aquatic & terrestrial
-change seasonally to become more or less of each ecosystem
-only 10% of perth’s wetlands remain, majority on swan coastal plain