Department of Biology, University of Florida, Gainesville, FL, 32611-8525, USA.
New Phytol. 2021 May;230(4):1300-1304. doi: 10.1111/nph.17241. Epub 2021 Mar 10.
Phylogenetic trees have permeated biology. However, an understanding of how to interpret phylogenies has lagged behind, notably in publications outside of evolutionary biology. Here I argue that some language commonly used in plant systematics has contributed to the confusion by describing phylogenetic trees using intuitive but misleading terms reminiscent of Aristotle's Scala Naturae. These terms (perhaps inadvertently) misrepresent evolution, not as a process acting on all living species, but rather as a progression of successively diverging lineages leading to a group that represents a subjectively defined endpoint. My goal here is to show how thinking of the tree of life in terms of early-diverging lineages and higher groups can distort evolutionary literacy, confound interdisciplinary communication, and potentially bias research agendas. I focus on the relationship between bryophytes and angiosperms as a case study, but the theme applies to all branches of the tree of life. Fortunately, evolutionary biologists have developed an easily understood alternative framework - tree thinking - which I highlight as a means to promote a clear understanding of phylogenies across sub-disciplines of biology, and between practicing biologists and students, or members the public which funds much of our work.
系统发生树已经渗透到生物学中。然而,对如何解释系统发生树的理解却一直滞后,特别是在进化生物学以外的出版物中。在这里,我认为植物系统学中使用的一些常见语言通过使用直观但容易产生误导的术语来描述系统发生树,从而导致了这种混淆,这些术语让人联想到亚里士多德的自然阶梯(scala naturae)。这些术语(也许是无意中)歪曲了进化,不是将其描述为作用于所有现存物种的过程,而是将其描述为一个连续分歧的谱系的进展,导致一个代表主观定义的终点的群体。我在这里的目的是展示如何用早期分歧的谱系和高级群体来思考生命之树会扭曲进化素养,混淆跨学科交流,并可能影响研究议程。我以苔藓植物和被子植物之间的关系为例进行研究,但这一主题适用于生命之树的所有分支。幸运的是,进化生物学家已经开发出了一个易于理解的替代框架——树思维,我强调这是在生物学的各个子学科之间,以及在从事生物学工作的研究人员和学生,或资助我们大部分工作的公众之间,促进对系统发生树的清晰理解的一种手段。