Abstract
Annual killifish live in temporary pools which completely lose water during the dry season. They bury their eggs in the muddy bottom where they stay through the entire dry season. The development of killifish embryos involves three strictly defined stages, where the embryo may go dormant and stop developmental progression. The system of the three facultative diapauses — diapause I, II, and III — was described in the 1970s and remained supported until now. Here, we report on the potential of the embryos of an African killifish species Nothobranchius furzeri Jubb to enter an additional developmental stasis occurring in between the stages defined for the diapause II and III. The stasis manifests as a full developmental halt in a stage previously regarded as non-diapausing or a markedly slowed down developmental rate. It occurs under usual laboratory incubation conditions, and the embryos that entered the stasis are capable of normal hatching after they exit the dormancy and complete their development. The aim of the study is to inform on the increased, cryptic complexity of the killifish diapause system while we discuss the possible reasons why the stasis, arguably occurring with some regularity, remained unnoticed for so long.
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Experimental data including Supplementary material are available online at https://figshare.com/s/ad404f66c318f68c7512.
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The authors would like to thank two anonymous referees for their valuable and helpful comments.
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The study was funded by the Czech Science Foundation project No. 18-26284S.
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Research adhered to all national and institutional animal care and use guidelines. Experimental procedures, handling protocols, and facility were approved according to the laws of the Czech Republic No. 246/1992 and No. 419/2012 and by Ministry of Agriculture (breeding facility no. CZ 62760203, permit approval document 62,116/2017-MZE17214). Both authors hold the certificate to conduct experiments on vertebrates according to the Czech legislation §15e, Law 246/1992 on Animal Welfare.
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Polačik, M., Vrtílek, M. Cryptic stasis during the development of Nothobranchius furzeri suggests new stages of dormancy outside of the typical three diapauses of annual killifishes. Environ Biol Fish 106, 575–583 (2023). https://doi.org/10.1007/s10641-023-01393-2
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DOI: https://doi.org/10.1007/s10641-023-01393-2