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发育整合和历史偶然性在鲤形目营养创新的起源和演化中的作用。

The Role of Developmental Integration and Historical Contingency in the Origin and Evolution of Cypriniform Trophic Novelties.

机构信息

Department of Biological Sciences, The George Washington University, Science and Engineering Hall, 800 22nd Street NW, Suite 6000, Washington, DC 20052, USA.

Department of Biology, University of Washington, Life Sciences Building, Seattle, WA 98195, USA.

出版信息

Integr Comp Biol. 2019 Aug 1;59(2):473-488. doi: 10.1093/icb/icz056.

Abstract

While functional morphologists have long studied the evolution of anatomical structures, the origin of morphological novelties has received less attention. When such novelties first originate they must become incorporated into an integrated system to be rendered fully functional. Thus, developmental integration is key at the origin of morphological novelties. However, given enough evolutionary time such integration may be broken, allowing for a division of labor that is facilitated by subsequent decoupling of structures. Cypriniformes represent a diverse group of freshwater fishes characterized by several trophic novelties that include: kinethmoid-mediated premaxillary protrusion, a muscular palatal and post-lingual organ, hypertrophied lower pharyngeal jaws that masticate against the base of the neurocranium, novel pharyngeal musculature controlling movement of the hypertrophied lower pharyngeal jaws, and in a few species an incredibly complex epibranchial organ used to aggregate filtered phytoplankton. Here, we use the wealth of such trophic novelties in different cypriniform fishes to present case studies in which developmental integration allowed for the origin of morphological innovations. As proposed in case studies 1 and 2 trophic innovations may be associated with both morphological and lineage diversification. Alternatively, case studies 3 and 4 represent a situation where ecological niche was expanded but with no concomitant increase in species diversity.

摘要

虽然功能形态学家长期以来一直研究解剖结构的进化,但形态新颖性的起源却受到较少关注。当这些新颖性最初出现时,它们必须融入一个集成系统才能实现完全功能。因此,发育整合是形态新颖性起源的关键。然而,在足够的进化时间内,这种整合可能会被打破,从而允许通过随后的结构解耦来实现分工。鲤形目鱼类是一组多样化的淡水鱼类,其特征是存在几种营养新颖性,包括:通过晶状骨介导的前颌骨突出、肌肉腭和舌后器官、肥大的下咽颌骨咀嚼颅神经基部、控制肥大的下咽颌骨运动的新型咽肌,以及在少数物种中,有一个用于聚集过滤浮游植物的令人难以置信的复杂的上鳃器官。在这里,我们使用不同鲤形目鱼类中丰富的营养新颖性来呈现案例研究,这些案例研究表明,发育整合允许形态创新的出现。正如案例研究 1 和 2 中提出的那样,营养创新可能与形态和谱系多样化相关。或者,案例研究 3 和 4 代表了一种生态位扩大但物种多样性没有相应增加的情况。

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