Overall Flashcards
(40 cards)
What does a survey sampler measure
Samples freshwater invertebrates
How to sample night flying moths
Light traps
What does a sweep net measure
Insects in ground vegetation
How are invertebrates collected in overhead vegetation
Beating tray
What does a tullgren funnel do
Separates soil animals from leaf litter
How to standardise data collection
Same time of day/ year
Same weather
Same sampling method
Same sample size
Same number of samples
How can introduced species threaten indigenous wildlife
Disease introduction
Habitat change
Competition (food/ breeding site)
How would reductions of light levels from the canopy affect the biodiversity of invertebrates
Less ground plants
Less food (DOM)
Reduced population diversity
What is the carrying capacity
The maximum population that can be supported sustainably
Advantages of eDNA
More accurate identification
Less time consuming at the site so less disturbance
Disadvantages of eDNA
Longer to obtain results from the lab
DNA degrades quickly in warm conditions
What test is used to assess significant correlation
Spearman’s rank
Explain spearman’s rank correlation
If the test value is less than the critical value there is no significant correlation so the null hypothesis is accepted
What earth feature causes the retention of the atmosphere
High mass and gravity
What does the speed of rotation control
Regulates day and night temperatures
What does the presence of a magnetic field do
Deflects solar winds and radiation
What earth feature causes the seasonal changes
The axis of rotation
What does high atmospheric pressure control
The presence of liquid water
Why would replacing palm oil with other crop cause more environmental damages
All other crops are less productive
More land is required for other crop which causes more habitat destruction
How have changes in woodland coverage (deforestation) changed the local hydrology
Less interception and evapotranspiration
Greater river volume
Increased rainfall
Why are non indigenous trees sometimes preferred over natives in the uk for timber
Faster growth
Explain how standard deviation can be used to compare data sets
If they don’t overlap there is a significant difference
How can representative data of the number of ground vertebrae from different woodlands be collected
Systematic sampling of leaf litter sorting in trays
Minimum 10 traps set (do a mean)
A number of different species counted
Same size trap
Same number of traps in an area
Same time of day/ season/ weather
Why do coniferous woodlands have lower invertebrates species
Non- indigenous species therefore fewer food sources
