Surfperches versus Damselfishes: Trophic Evolution in Closely Related Pharyngognath Fishes with Highly Divergent Reproductive Strategies.

IF 2.2 4区 生物学 Q2 BIOLOGY Integrative Organismal Biology Pub Date : 2024-05-27 eCollection Date: 2024-01-01 DOI:10.1093/iob/obae018
W J Cooper, M R Conith, A J Conith
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Abstract

Surfperches and damselfishes are very closely related ovalentarians with large reproductive differences. Damselfishes are typical of most Ovalentaria in that they lay demersal eggs that hatch into small, free-feeding larvae. Surfperches are unusual among ovalentarians and most acanthomorphs in having prolonged internal development. They are born at an advanced stage, some as adults, and bypass the need to actively feed throughout an extended period of ontogeny. Damselfishes and surfperches possess the same modifications of the fifth branchial arch that allow them to perform advanced food processing within the pharynx. This condition (pharyngognathy) has large effects on the evolution of feeding mechanics and trophic ecology. Although the evolution of pharyngognaths has received considerable attention, the effects of different reproductive strategies on their diversification have not been examined. We compared head shape evolution in surfperches and damselfishes using geometric morphometrics, principal component analyses, and multiple phylogenetic-comparative techniques. We found that they have similar mean head shapes, that their primary axes of shape variation are comparable and distinguish benthic-feeding and pelagic-feeding forms in each case, and that, despite large differences in crown divergence times, their head shape disparities are not significantly different. Several lines of evidence suggest that evolution has been more constrained in damselfishes: Head shape is evolving faster in surfperches, more anatomical traits have undergone correlated evolution in damselfishes, there is significant phylogenetic signal in damselfish evolution (but not surfperches), and damselfishes exhibit significant allometry in head shape that is not present in surfperches.

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冲浪鱼与豆娘鱼:生殖策略高度不同的近缘副颌鱼类的营养进化》(Trophic Evolution in Closely Related Pharyngognath Fishes with Highly Divergent Reproductive Strategies)。
冲浪鱼和豆娘是亲缘关系非常近的卵形纲动物,但在繁殖方面却有很大差异。豆娘是大多数卵瓣纲动物的典型特征,它们产下底栖卵,孵化成自由觅食的小型幼虫。冲浪鱼的内部发育期较长,这在卵囊类和大多数棘皮动物中并不常见。它们出生时已处于晚期,有些还是成鱼,在整个发育过程中不需要主动觅食。豆娘和冲浪鱼的第五鳃弓也有同样的变化,使它们能够在咽部进行高级食物加工。这种情况(咽认知)对摄食机制和营养生态学的进化有很大影响。尽管咽喉动物的进化受到了广泛关注,但不同的繁殖策略对其多样化的影响尚未得到研究。我们利用几何形态计量学、主成分分析和多种系统发育比较技术,比较了冲浪鱼和豆娘的头形进化。我们发现,它们具有相似的平均头型,头型变异的主轴相当,并分别区分了底栖和中上层食性,而且尽管头冠的分化时间相差很大,但它们的头型差异并不显著。一些证据表明,豆娘的进化受到了更多的限制:冲浪鱼的头型进化更快,大娘鱼有更多的解剖学特征经历了相关进化,大娘鱼的进化(而不是冲浪鱼)有明显的系统发育信号,大娘鱼的头型表现出明显的同源性,而冲浪鱼则没有。
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来源期刊
CiteScore
3.70
自引率
6.70%
发文量
48
审稿时长
20 weeks
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