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Test Recap - Coggle Diagram

- - - - Traps invertibrates
        
        Numbers may not be representative of the ecosystem as a whole(could be true for all sampling techniques), birds may eat, some animalsmay eat others
        
        set up several traps, disguise the opening with a lid (a leaf), check traps regularly or put a preservative liquid (50% ethanol) in the bottom.
    - - Rectangular shaped sampling unit of known area
        
        Numbers may not be representative especially if species grow in clusters, a plant could be half in half out the quadrat.
        
        Use a large amount of carefully plotted quadrats and establish a rule if the plant is half in on the bottom or left hand side of quadrat it is counted as in, if plant is half in on top or right hand side of quadrat it's counted out.
  - - - Biotic factors are the biological/living aspects of an ecosystem e.g competition, predation, disease, food availability and grazing.
    - - Abiotic Factors are the non-living or physical factors that affect ecosystems e.g Moisture, Light inetensity, Temperature, pH, Wind Speed, Oxygen Availability.
        
        Measuring light intensity we would need a light meter
        
        You could be shading the light sensor or it could be dirty
        
        You could correct this by holding the light meter at arms length with sensor facing towards source of light and ensure the sensor is clean
        
        Measuring soil pH you would need a pH reader.
        
        The probe could have traces of the previous measurement on it
        
        Your could ensure there is good contact between the reader and the probe and material to be measured and ensure it's clean.
  - - - These can all lead to either the increase and decrease of biodiversity.
        
        Measuring Biodiversity requires two things estimating population sizes and identifying species and variety.
  - - - An indication species help indicate levels if pollution wither by their presence or absence.
        
        An example of an indicator species are lichens (air pollution), stonefly or sludge worms (all freshwater pollution)
- - - - There are some problems with fertilisers though, leaching is one where the fertiliser run of the field into a nearby river or loch, this causes a rapid increase of growth in algae creating an algal bloom, this cuts of the light for the other plants down below and when these plants die aerobic bacteria feed on them and rapidly multiply, therefore there is less oxygen available for other organisms so they die.