从确定未灭绝到确定灭绝，其间存在一个渐变谱系

“There is a gradient between definitely not extinct, definitely extinct and everything in between” Finding that long-lost plants and animals are still alive often isn’t an unmitigated cause for celebration, says evolutionary biologist Aelys Humphreys. She tells Penny Sarchet that to get to grips with the true scale of species loss, we need to completely change how we think about extinction THERE are tens of thousands of species of orchid, making it the second most species-rich plant family on Earth. Their exceptional diversity is driven in part by tightly evolved relationships with pollinating insects and root-boosting fungi. …