题型:阅读理解 题类:常考题 难易度:普通
江苏省连云港市2021届高三下学期英语期初调研试卷
The European wood bison population has grown so much as to no longer be considered "Vulnerable" according to the global authority on conservation, the International Union for Conservation of Nature (IUCN), in their latest Red List update.
A century ago, only 50 European bison remained on Earth, and they were mostly restricted to nature reserves.
"The conservation successes provide living proof that the world can set, and meet, ambitious biodiversity targets," said Dr. Jane Smart, Global Director of IUCN' s Biodiversity Conservation Group in a statement.
Eight of the 47 bison herds have special genes for long-term survival, so scientists need to move animals in and out of herds in order to make healthy genes continue. Establishing greater numbers of separate herds will also help prevent possible losses due to things like diseases or natural disasters.
This led to the creation of a project called "Wilder Blean" where Blean Woods in Kent, England, will receive Dutch and Polish bison to create the first wild herd on the island for 6, 000 years.
English conservationists and wildlife managers are interested in the effects bison have on the landscape. As large grass-eating animals, the constant foraging, digging and breaking they do on the forest floor have been assumed to have positive effects on the ecosystem.
Bison kill weak or dead trees by eating their bark or rubbing against them to remove their thick winter fur. This turns the tree into food and habitat for insects, which in turn provide food for birds.
In this way they act like forestry experts, and the Kent Wildlife Trust hopes that this significant species will maintain declining populations of plants, birds, insects, and mammals by way of their unique habits.
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