name two examples of chemical inputs into the marine environment
name five examples of human impacts on the environment
-dredging/mining (e.g. Tauranga harbour)
-terrestrial runoff (important stressor in NZ)
-nutrient loading (causing algal blooms, eutrophication)
-organic enrichment (e.g. salmon farms)
What changes following a disturbance?
-Loss of some or all members of the community
-near-bed hydrodynamics (removal of biogenetic structure, alteration of channel flow)
-food supply (increase if there is organic loading, decrease if the surface organic layer is removed)
-chemical gradients (RPD disturbed)
-sediment grain size (smaller or larger dependent on dusturbance)
describe macrofaunal succession
how is the population growth rate related to the frequency of disturbance?
display the impacts of multiple impacts comparing stable and unstable assemblage
what are three potential problems when detecting impacts?
•Many populations sustained by recruits from elsewhere so loss of a species may not be indicative of environmental degradation
•Substantial natural variation in time and space which must be assessed
•Ensuring adequate sampling effort to be certain a species is not present (see previous lecture)
describe a survey design to detect impacts
describe the function of a ABC curve