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Slide 1 - Sunday crab lab! Wear: warm clothes, bring gloves and RUBBER BOOTS. If raining, bring umbrella. Transport on Sunday: Either arrive before 12 noon at Spanish Banks, or 11:50 latest in Zoology courtyard. Monday: meet in Zoology courtyard at 1pm
Slide 2 - La Pérouse Bay Snow Goose
Slide 3 - Herding flightless geese into a “keyhole” net
Slide 4 - Recording which birds are marked, and marking new birds
Slide 5 - Goose leg bands Goose biologist
Slide 6 - Year LPB Colony size
Slide 7 - Mark recapture lectures Petersen method Schnabel method Schumacher-Eschmeyer Jolly Seber Closed population Open population Overview of methods to help your reading of Krebs Chp 2
Slide 8 - Closed populations No individuals enter or leave the population between surveys Survey 1 Survey 2
Slide 9 - Open populations Individuals enter or leave the population between surveys Survey 1 Survey 2
Slide 10 - What makes a population closed? Dispersal barriers Philopatry Large surveyed area Slow reproductive/death rate Short time between surveys
Slide 11 - What type of population are the snow geese?
Slide 12 - Petersen method: Closed population Catch several animals Survey 1: Mark all M animals Return animals to population Catch C animals Survey 2: Count recaptures (R) Return animals to population
Slide 13 - ppt slide no 13 content not found
Slide 14 - C = 15 R = 4 What is the total population size (N)? Note that the proportion marked in the population equals the proportion marked in the 2nd sample M = 12
Slide 15 - C = 15 R = 4 What is the total population size (N)? Note that the proportion marked in the population equals the proportion marked in the 2nd sample N = (M+1) (C+1) (R+1) M = 12 -1
Slide 16 - When would Petersen give you a bad estimate? Population not closed Marked animals likely to be re-trapped Marked animals likely to die Marks fall off
Slide 17 - Schnabel method: closed population Survey 1 Essentially, Petersen estimates on multiple surveys
Slide 18 - Schnabel method: closed population
Slide 19 - Schnabel method: closed population Catch Ct animals Survey t: Mark Ut unmarked animals Return animals to population Record Rt recaptures What’s the relationship between Ct, Rt, and Ut ? Ct = Rt + Ut
Slide 20 - Schnabel method: example How many individuals marked by beginning of time 5?
Slide 21 - Schnabel method: example How many individuals marked by beginning of time 5?
Slide 22 - Schnabel method: example Σ = 58
Slide 23 - Schnabel method: example Σ = 58 In general: Mt = U1 + U2..Ut-1
Slide 24 - Schnabel formulas: N = Σ (Ct Mt) Σ Rt ( just weighted average of Petersen estimates!) N = Σ (Ct Mt) Σ Rt+1 Marked > 10% of population Marked < 10% of population
Slide 25 - Schnabel method: example 0 48
Slide 26 - Schnabel method: example Σ = 2060 0 48 Σ = 22
Slide 27 - Schnabel method: example 0 48 Σ = 2060 Σ = 22 N = Σ (Ct Mt) = 2060 = 94 Σ Rt 22
Slide 28 - Schnabel method: example 0 48 Σ = 2060 Σ = 22 What proportion of total population marked by end?
Slide 29 - Scumacher-Eschmeyer method (for Schnabel experiment) N = C M R y = mx + b
Slide 30 - Scumacher-Eschmeyer method (for Schnabel experiment) N = C M R R C M Slope = ?