Value and threats
Use of the waterway for boating would see the waterway valued...
economically?
socially?
environmentally?
socially
What is salinity?
salt content (dissolved in water)
the vegetation surrounding a waterway is called
riparian vegetation
What is it called when water hits pavement or an impermeable surface and it then reaches a waterway
run-off
How does the temperature of water affect waterway health?
Sensitive plants and species can be impacted by temperature rises (they can't survive in higher temperatures!)
what is one purpose of surrounding vegetation in maintaining waterway health?
erosion control, contaminant filtration, flood control, habitat, temperature control
explain one way in which a dam impacts waterways biologically
- some fish species cant migrate to reproduce
- disrupts natural flow, creates stagnant areas that limits habitat for ecosystems
- sediment is trapped that is required downstream that disrupts habitats and biodiversity
Why do we measure Dissolved Oxygen in water to test waterway health?
Tells is whether life is supported by water (oxygen is required in water to support respiration of plants and species!)
Macroinvertebrates each have a _____ rating which is a numerical score that tells you how sensitive a waterbug is to water quality
signal
What kind of human activity (name 1) is likely to cause high nutrient (nitrates and phosphates) levels to enter and pollute waterways?
extra 100 points for what high nutrient loads create
Agriculture (fertiliser, pesticides)
Commerical waste (factories)
Urban runoff
Waste water
100 points: Eutrophication (overgrowth of algae that reduces sunlight, photosynthesis and reduction of biodiversity)
A measure of water clarity (higher turbidity + dirty looking water)
20 NTU is the highest parameter where below 1m of water, photosynthesis cannot occur
Which part of the river course is a mayfly nymph most likely to be found? Explain why.
Source
Mid Course
Estuary (close to mouth)
Source. The water is most pristine and healthy, and mayfly nymphs have a high sensitivity so will only be present in clear, unpolluted, low turbidity water.