Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Wood Buffalo National Park' has mentioned 'Wood bison' in the following places:
Occurrence Sentence Text Source
[3] The park was established in 1922 to protect the world's largest herd of free roaming [4] wood bison.
Plains bison were transferred here from Buffalo National Park in the 1920s, but they carried disease and hybridized with the wood bison, causing their numbers to drop.
[11] The plains bison hybridized with the local 1,500-2,000 wood bison, and carried such diseases as bovine tuberculosis and brucellosis, which they introduced into the wood bison herd.
In 1957, however, a disease-free, relatively pure wood bison herd of 200 was discovered near Nyarling River.
Today they number 300 and are the most genetically pure wood bison remaining.
As above-mentioned, "wood bison" in the park are hybrid descendants, the product of unions with plains bison that were transferred to the park in the 1920s from Buffalo National Park.
That, plus the hybridization that ensued, threatened the survival of true wood bison.
The herd at the Sweetgrass Station near Peacexe2x80x93Athabasca Delta, followed by Slave River Lowlands herd, preserve a phenotype closer to the original wood bison before the 1920s.
Wood bison (not pure) Marmot American white pelicans at Rapids of the Drowned (Slave River) Beaver lodge Pine Lake
It sustains the worldxe2x80x99s largest herd of wood bison, a threatened species.
Criterion (ix): Wood Buffalo National Park is the most ecologically complete and largest example of the entire Great Plains-Boreal grassland ecosystem of North America, the only place where the predator-prey relationship between wolves and wood bison has continued, unbroken, over time.
Bovine brucellosis and tuberculosis are present within the wood bison population in and around the park.