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Unformatted text preview: C. Proxy- nests, feeding damage, fecal droppings African savanna elephants - count from a plane African forest elephants - notoriously hard to count, elusive Richard Barnes (UCSD) - developed 1st method to quantify forest elephant density using dung How to measure density? D. Mark-recapture capture 1st sample of animals mark those animals, release capture 2nd sample of animals how many are marked (recaptured) D. Mark-recapture-How to mark animals in the field? Paint insects Band birds Metal rings around legs of invasive crabs Fish tag D. How to measure density? Mark - recapture N = n 1 n 2 m Say you capture and mark 10 turtles in a lake On a 2nd visit, you capture 15 turtles 5 turtles are marked N = 10*15 5 = 30 N = population size n 1 = # captured & marked n 2- # captured in 2nd sample m - # re captured...
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