Studying ecosystems 0.0 / 5 ? BiologyStudying ecosystemsA2/A-levelOCR Created by: Esme.BCreated on: 28-02-18 12:52 Why do ecologists sample ecosystems? It would take too long and require too much manpower to study a whole habitat 1 of 17 Definition of 'point sampling'? Sampling a geographical area by selecting points. (Points at random) 2 of 17 What size is a 'Quadrat'? 1m2 3 of 17 What X2 types of data do 'Quadrats' collect? 1). Distribution: presence or absence of each species 2). Abundance: No. of individuals or % cover 4 of 17 What is a 'Point quadrat'? Point quadrats make estimate more accurate as estimating % cover is difficult. 5 of 17 What X2 types of sampling can be used to be able to 'Place quadrats' with biases? 1). Random sampling 2). Systematic sampling 6 of 17 What is 'Random sampling'? 1). Lay out 2 tape measures to form axes 2). Use a calculator/random number table to generate pairs of random numbers for coordinates 7 of 17 What is 'Systematic sampling'? ???? 8 of 17 When is a 'Cumulative frequency table' used? Used to determine how many samples to take in a habitat to give an accurate representation. 9 of 17 What's the formula of 'Estimating population size'? Population size = mean no. of individuals of the species in each quadrat / fraction of the total habitat area covered by a single quadrat 10 of 17 What is a 'Transect'? Used to look at changes in abundance and distribution across a habitat 11 of 17 What are the X2 approaches to using a 'transect'? 1). Line Transect 2). Belt Transect 12 of 17 What is a 'Line Transect'? At regular intervals, make a note of which species is touching the tap. 13 of 17 What are the X2 types of 'Belt Transect'? 1) interrupted belt transect 2). Continuous belt transect 14 of 17 What is a 'Interrupted Belt Transect'? At regular intervals, place a quadrat next to the line and study each. 15 of 17 What is a 'Continuous belt transect'? Place a quadrat next to the line, moving it along the line after looking at each quadrat. 16 of 17 What is a 'Kite diagram'? Represent distribution and abundance of different species along a transect line. 17 of 17
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