Methods

Question 1

what are density dependent factors and examples

Answer 1

affect the population when population reaches certain size or density. less resources, more stress, more competition. food, space, disease, predation, territoriality,watse

Question 2

what are density independent factors and examples

Answer 2

factors that affect population no matter the number of individuals, abiotic such as earthquakes and extreme temp variations

Question 3

What is the direct method and when used?

Answer 3

counting, census, aerial photography for large and stationary animals

Question 4

Explain mark recapture method and give formula

Answer 4

demarcate area. take first sample and mark, give time to mix in environment, take second sample and count how many marked.

p= mxs/t

Question 5

Accuracy, reliability and validity of mark recapture method

Answer 5

accuracy- mark last entire period
-mark does not hinder movement

validity- closed pop
time to mix
method of capture does not hinder chances

reliability- repeat experiment
take bigger captures

Question 6

Explain quadrat method and give formula

Answer 6

demarcate area. take quadrats and throw randomly. count number of individuals in quadrats.
pop size= average number of organisms x surface area/ surface area of quadrat

Question 7

accuracy of quadrat method?

Answer 7

surface area know
surface area of quadrat known
number of individuals in quadrats known
quadrat placed at random