Is African non-annual killifish Fundulopanchax gardneri (Teleostei; Cyprinodontiformes; Nothobranchiidae) true non-annual?

IF 2 3区生物学 Q2 ANATOMY & MORPHOLOGY

Developmental Dynamics Pub Date : 2023-10-19 DOI:10.1002/dvdy.668

Vasily Borisov, Fedor Shkil, Dmitry Seleznev, Sergei Smirnov

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Abstract

Background

Annual or seasonal killifishes (Cyprinodontiformes: Nothobranchiidae) are unique among fish in their ability to enter into developmental arrests (diapauses: DI, DII, and DIII). They have a short lifespan and their embryos are exceptionally tolerant to a variety of environmental stresses. These traits make them a popular model for studying vertebrate diapause, aging, stress tolerance, genome adaptation, and evolution. In such issues, in a comparative evolutionary framework, Fundulopanchax gardneri, a popular aquarium fish from Africa, is commonly used as a representative non-annual model though its development is not studied in detail and whether it includes diapauses remains uncertain.

Results

We described in detail for the first time embryonic development of F. gardneri and revealed it to resemble that in the undoubtedly annual Austrofundulus limnaeus killifish in displaying two developmental depressions. However, if compared with A. limnaeus, these developmental states look like “less intense” versions of DII and DIII rather than true diapauses.

Conclusions

To determine whether developmental depressions in F. gardneri represent “true” diapauses or only their functional equivalents, detailed studies of embryonic development of different killifish both annual and non-annual are needed. Before that, acceptance of F. gardneri as a representative non-annual fish seems premature.

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非洲非年生圆底溪鱼真的是非年生的吗？

背景：在鱼类中，年生或季节性的killifish（Cyprinodontiformes:Nothobranchiidae）在进入发育停滞（滞育：DI、DII和DIII）的能力方面是独特的。它们的寿命很短，而且它们的胚胎对各种环境压力都特别耐受。这些特征使它们成为研究脊椎动物滞育、衰老、应激耐受、基因组适应和进化的流行模型。在这些问题上，在一个比较进化的框架中，来自非洲的一种受欢迎的水族馆鱼类gardneri，通常被用作一种具有代表性的非年度模型，尽管它的发展没有得到详细研究，是否包括滞育仍不确定。结果：我们首次详细描述了F.gardneri的胚胎发育，并发现它与毫无疑问的年度鲎鱼的胚胎发育相似，表现出两种发育抑制。然而，如果与林蛙相比，这些发育状态看起来像是DII和DIII的“不那么强烈”版本，而不是真正的滞育。结论：为了确定F.gardneri的发育凹陷是否代表“真正的”滞育，或者只是它们的功能等价物，需要对不同的年生和非年生基利鱼的胚胎发育进行详细研究。在此之前，人们似乎还为时过早地接受加德奈里作为一种具有代表性的非年度鱼类。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Developmental Dynamics 生物-发育生物学

CiteScore

5.10

自引率

8.00%

发文量

116

审稿时长

3-8 weeks

期刊介绍： Developmental Dynamics, is an official publication of the American Association for Anatomy. This peer reviewed journal provides an international forum for publishing novel discoveries, using any model system, that advances our understanding of development, morphology, form and function, evolution, disease, stem cells, repair and regeneration.