ArticleBMC biology2023
Expanded olfactory system in ray-finned fishes capable of terrestrial exploration.
Article in BMC biology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 23 citations in OpenAlex.
- Opsin gene evolution in aquatic, amphibious and terrestrial blennies (Blenniidae).Biology open · 2026Article
- Article
- The olfactory bulb endocast as a proxy for mammalian olfaction.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Full-length hybrid transcriptome of the olfactory rosette in Senegalese sole (Solea senegalensis): an essential genomic resource for improving reproduction on farms.DNA research : an international journal for rapid publication of reports on genes and genomes · 2025Article
- Divergent selection, recombination variability, and noncoding introgression drive speciation and adaptation in threadfin Eleutheronema.Communications biology · 2025Article
- Body Size Awareness and Modular Self-Representation in Reedfish (Animals : an open access journal from MDPI · 2025Article
- Making sense of vertebrate senses from a neural crest and cranial placode evo-devo perspective.Trends in neurosciences · 2025Review
- Whole genome resequencing reveals the correlation between selection signatures and adaptability of Micropterus salmoides to artificial fed.Scientific reports · 2024Article
- Type 2 vomeronasal receptor expression in the olfactory organ of African lungfish, Protopterus annectens.Cell and tissue research · 2024Article
- Article
Corrections and comments
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Authors and funding
12 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundSmell abilities differ greatly among vertebrate species due to distinct sensory needs, with exceptional variability reported in the number of olfactory genes and the size of the odour-processing regions of the brain. However, key environmental factors shaping genomic and phenotypic changes linked to the olfactory system remain difficult to identify at macroevolutionary scales. Here, we investigate the association between diverse ecological traits and the number of olfactory chemoreceptors in approximately two hundred ray-finned fishes.
resultsWe found independent expansions producing large gene repertoires in several lineages of nocturnal amphibious fishes, generally able to perform active terrestrial exploration. We reinforced this finding with on-purpose genomic and transcriptomic analysis of Channallabes apus, a catfish species from a clade with chemosensory-based aerial orientation. Furthermore, we also detected an augmented information-processing capacity in the olfactory bulb of nocturnal amphibious fishes by estimating the number of cells contained in this brain region in twenty-four actinopterygian species.
conclusionsOverall, we report a convergent genomic and phenotypic magnification of the olfactory system in nocturnal amphibious fishes. This finding suggests the possibility of an analogous evolutionary event in fish-like tetrapod ancestors during the first steps of the water-to-land transition, favouring terrestrial adaptation through enhanced aerial orientation.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.