请问一个长难句，OG17倒数第7篇里面的一句话

冲八破七

Many fairly commonamphibian species declared all but extinctafter severe declines in the 1950s and 1960s have subsequently recovered, and so might the apparently declining populations that have generated the currentappearance of an amphibian crisis.

这句话的后半部分是一个什么样的语法结构呀，看起来是so that句型的倒装，但是整句话还是分析不好，自己分析的云里雾里的，求大神解答，非常感谢!!!!!

冲八破七

哦哦哦，我发现我好像搞错啦，不是so that倒装，而是so倒装，that引导定语从句，，，，，

Alicia0

so does sth 的省略句型    相当于 he likes running ,so do I        楼主说得对原文中的that是个定从