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Mark recapture lectures (Department of Zoology) PowerPoint Presentation

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On : Feb 10, 2014

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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 = ?

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