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这篇文章本身并没有挑战进化论的意思,对于所发现的现象,它提出了两种可能性:
第一种,Environmental trauma is one possibility. Viruses, ice ages, successful new competitors, loss of prey—all these may cause periods when the population of an animal drops sharply. In these periods, it is easier for a genetic innovation to sweep the population and contribute to the emergence of a new species.
但这种解释的问题是:But the last true mass extinction event was 65.5 million years ago when a likely asteroid strike wiped out land-bound dinosaurs and half of all species on Earth. This means a population "bottleneck" is only a partial explanation at best.
于是提出第二种解释:
"The simplest interpretation is that life is always evolving," said Stoeckle.
"It is more likely that—at all times in evolution—the animals alive at that point arose relatively recently."
In this view, a species only lasts a certain amount of time before it either evolves into something new or goes extinct.
只不过这一条和我们常规认识的物种进化规律不一样。
另外,对进化论有所挑战的是下面这段:
And yet—another unexpected finding from the study—species have very clear genetic boundaries, and there's nothing much in between.
"If individuals are stars, then species are galaxies," said Thaler. "They are compact clusters in the vastness of empty sequence space."
The absence of "in-between" species is something that also perplexed Darwin, he said.
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