exam III-reintroduction success/failures Flashcards
success/failures
- griffon vultures in France: dispersal of existing populations, reintroduction but sounds like reinforcement (success was survival after a year)
- endangered legume Grand Canyon – criteria of success was genetic diversity (failure because not enough); more time for species to be brought into wild
- Arabian orris: reintroduce in 1982 to larger pop; worked for a while but then poaching became an issue, still only 138 in wild. Taken to rescue. Second release 1984, 1986 more due to rainfall; poaching made if fall, brought it back up, then poaching again now only in rescues, 1998. Original cause of decline – 3-year drought and poaching, poaching after was end issue.
Number one reason reintroductions fail is failure to address and fix original reason for decline.
-horse breed in China: not enough genetic diversity, captive breeding, do soft release into wild. This breed will interbreed with domestic horses. Now take in over winter for captive breeding to prevent spread through out domestic horses. Not independent of the people taking care of them. Slightly successful but not able to be left alone just yet.
Different levels of success, top = sinking no more money into them, down in varying degrees to outright failures.
- prerequisites for success: self-sustaining populations, suitable habitats, eliminate factors that add to decline, choice of release site
- movement of Persian fallow deer: didn’t move very far after first release; failure because no account for predators in area and in order to be successful release when there are not tourists around causing more stress.
Movement behavior indicators for reintroduction success: points of attraction, proximity to other individuals (herd animal), individual variation in movement behavior
-artic fox release in Norway: failure captive breeding, habitat too small (fixed that), success because main goal was to disperse among 3 mountain tops; population was at 350, 10-year project
-African dog – successful soft release techniques, food source being released and established first, socioeconomic factors, think about process by which species become established (same for plants, need to make sure they aren’t out competed, maybe burn the ground then introduce them
