托福听写作业21

托福听写作业21

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Today we’re going to continue our discussion of social insects, focusing on the Argentine ant, which, as you might guess, is a species of ant that’s native to Argentina. We'll consider what happened to this type of ant after some members of this species moved to California from their original habitat. OK, well, in Argentina, these Argentine ants behave like most ant species around the world. They fight other ants of the same species if those ants are from some other nest. But the Argentine ants living in California behave differently. Ants from different nests form a single large colony. Within this colony, there is little aggression among ants from different nests. And when they fight insects from outside their colony, the Argentine ants can quickly recruit a huge army from their network of nests. This of course gives them advantage over other ant species. So then, why do Argentine ants behave differently in California than they do in Argentina? Well, using genetic testing, researchers found that all the Argentine ants in California were very similar genetically. You see when the first Argentine ant came to California, their population must’ve been very small. And all the later generation of Argentine ants there must've descended from the same few ancestors. So they’re all closely related. This discovery is important because for most social insects, membership in a colony is based on how closely related they’re genetically.

生词摘录：

1.Argentine: adj. 阿根廷人（的）

2.Argentina: n. 阿根廷

3.ant: n. 蚂蚁

4.species: n. （单复数相同）物种，种类

5.habitat: n. 栖息地

6.nest: n. 巢，窝

7.colony: n. 群体，集群

8.aggression: n. 进攻，侵犯，侵略

9.recruit: v. 招募

10.n etwork: n. 网络

11.g enetic: adj. 基因的，遗传学的

12.g enetically: adv. 遗传学上

13.a ncestor: n. 祖宗，祖先

14.m embership: n. 会员身份（资格）