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Wildlife Conservation Test 3

Terms in this set (121)

Economic damage-nutria were raised for fur and brought to South, but they escaped. Now are resident in 18 states at high densities. They burrow into banks and through dikes-cause more flooding than anticipated. Eat sugar beets


Competition

mute swans European-exotic in US. Extremely territorial and aggressive, will take over and exclude all over waterfowl from breeding in a pond or lake. Ruins indigenous habitat

Gray squirrels Native, but were introduced in England. Did really well and outcompeted the native red squirrel.

Sika deer-Chinese deer that were introduced to Texas. Eat a lot of browse, compete with white-tailed deer. White tailed deer can't survive under stressful situations where sika deer are involved

Chinese ring-necked pheasants Chinese. Introduced into US. Released, and shot for sport. What are consequences? They attack native prairie chickens and drive them from their display/breeding grounds so they can't breed. Lay eggs in prairie chicken nests and hope that they will raise their young as well as their own.

wild boars European. There are 1000 wild boars harvested every year in US> They damage vegetation, agriculture, ground nesting birds, compete with native wildlife, eat acorns, carry infectious diseases


Predation

brown tree snakes Got to Guam in a plane. The snakes eat baby rails (birds) and drove them almost to extinction

American mink in Europe Harm the water vole in the UK, eat what they et and outcompete them

Rat predation on birds in Hawaii

Hybridization

ducks in Australia Grey duck, Mallard duck exotic to Australia, produce Grey-Mallard duck.-May lose grey ducks because they produce hybrids
prairie dog control campaigns -prairie dogs were seen as competitors. Black footed ferrets were captured as furbearers. The main black-footed decline came about because of prairie dog campaigns. They competed for grass. People didn't pay attention to the black footed ferret decline until 1930s.
in 1964-72, only 11 ferret litters. Were not known to live anywhere else
9 ferrets were taken into captivity from 1971 to 1973 for captive breeding . 9 ferrets were taking into captivity from 1971 to 73 for captive breeding. Although litters were born there, no young were successfully raised. The last captive ferrets died in 1978.

A dog found a dead black footed ferret in 1981 in Wyoming-after they were declared extinct
Ferreets rediscovered in prairie dog complexes in 81. That population remained healthy.

In 1985-sylvatic plagu e-deadly disease confirmed in prairie dogs in WY. In addition, reports of a substantial decrease in the number of ferrets were detected. Then, discovery of canine distemper in the ferrets themselves.

Emergency management-1985, 6 ferrets were captured to begin captive breeding, 2 of them rbought the virus and all 6 ferrets died.

By decmeber 1985, only 10 ferrets were known to exist, 6 in captivity and 4 in WY. The net yr only 2 litters were produced. Allr emaining ferrets were removed from the wild, resulting in a captive pop of 18 ferrets

Since 1987, there have been 4000 ferrets bred in captivity, 1400 have been released, 19 sites in U.S. where they have been introduced. Currently only 4 self-sustaining populations-don't have to augment the new population every year with new ferrets.
South Dakota- 250 ferrets, 100 wild kits born-some of which were released elsewhere

Goal: 10 self-sustaining populations. 1500 breeding animals
Only live in grasslands
Live there: herbivoers-prairie dogs, bison, other species
Prairie dogs are good at seeing predators from far away-stand up and look out for them
Carnivores: black footed ferrets, other species
Need ferrets to keep prairie dog numbers down because they are the only carnivores that can go into the tunnels and get them
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