準1級 - リーディング
アメリカバイソンの歴史と保護活動
5回解答
普通
準1級 - リーディング
アメリカバイソンの歴史と保護活動
5回解答
普通
The Revival of the American Bison
Before the arrival of European settlers, tens of millions of American bison roamed the Great Plains of North America. These massive herbivores played a crucial role in maintaining the prairie ecosystem. However, by the late 19th century, the species had been driven to the brink of extinction. The expansion of railroads, rampant commercial hunting for hides, and the deliberate destruction of the bison population to weaken Native American tribes caused their numbers to plummet. By 1889, fewer than 1,000 bison remained in the wild, alarming early conservationists who realized the species would vanish without immediate intervention.
The turning point for the American bison occurred in the early 20th century. In 1905, zoologist William Temple Hornaday and President Theodore Roosevelt founded the American Bison Society. Their goal was to raise public awareness and establish protected reserves. One of their most significant initiatives involved a captive-breeding program at the Bronx Zoo in New York City. In 1907, fifteen bison from the zoo were transported by train to a newly established wildlife refuge in Oklahoma. This historic transfer marked one of the first times an endangered species was bred in captivity and successfully reintroduced into its natural habitat.
Today, the American bison population has rebounded to roughly 500,000, but modern conservationists face a new set of challenges. The vast majority of these animals are raised on private ranches for commercial meat production, and many carry cattle genes due to historical crossbreeding efforts intended to create a hardier breed of livestock. Conservationists are now focusing on preserving the genetic integrity of the few remaining purebred herds. Additionally, managing the spread of diseases, such as brucellosis, between wild bison and domestic cattle remains a contentious issue in states like Montana and Wyoming.
According to the passage, why did the American bison population drastically decrease in the late 1800s?
What was one of the major achievements of the American Bison Society?
What is one of the primary concerns for modern bison conservationists?
The Revival of the American Bison
Before the arrival of European settlers, tens of millions of American bison roamed the Great Plains of North America. These massive herbivores played a crucial role in maintaining the prairie ecosystem. However, by the late 19th century, the species had been driven to the brink of extinction. The expansion of railroads, rampant commercial hunting for hides, and the deliberate destruction of the bison population to weaken Native American tribes caused their numbers to plummet. By 1889, fewer than 1,000 bison remained in the wild, alarming early conservationists who realized the species would vanish without immediate intervention.
The turning point for the American bison occurred in the early 20th century. In 1905, zoologist William Temple Hornaday and President Theodore Roosevelt founded the American Bison Society. Their goal was to raise public awareness and establish protected reserves. One of their most significant initiatives involved a captive-breeding program at the Bronx Zoo in New York City. In 1907, fifteen bison from the zoo were transported by train to a newly established wildlife refuge in Oklahoma. This historic transfer marked one of the first times an endangered species was bred in captivity and successfully reintroduced into its natural habitat.
Today, the American bison population has rebounded to roughly 500,000, but modern conservationists face a new set of challenges. The vast majority of these animals are raised on private ranches for commercial meat production, and many carry cattle genes due to historical crossbreeding efforts intended to create a hardier breed of livestock. Conservationists are now focusing on preserving the genetic integrity of the few remaining purebred herds. Additionally, managing the spread of diseases, such as brucellosis, between wild bison and domestic cattle remains a contentious issue in states like Montana and Wyoming.
According to the passage, why did the American bison population drastically decrease in the late 1800s?
What was one of the major achievements of the American Bison Society?
What is one of the primary concerns for modern bison conservationists?