Evidence for Hermaphroditism in the &lt;i&gt;Squalius alburnoides&lt;/i&gt; Allopolyploid Fish Complex

Matos, Isa; Machado, Miguel P.; Sucena, Élio; Collares‐Pereira, Maria João; Schartl, Manfred; Coelho, M. M.

doi:10.1159/000313359

Cited by 5 publications

(2 citation statements)

References 42 publications

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“…Nonetheless, some very few hermaphroditic individuals were recently captured and confirmed as such by the study of gonad morphology, biopsy and histology [Matos et al, 2010]. This finding favors an environmental influence on sex differentiation, a topic which is currently under an indepth analysis.…”

Section: Biology and Ecologymentioning

confidence: 71%

Natural Pathways towards Polyploidy in Animals: The Squalius alburnoides Fish Complex as a Model System to Study Genome Size and Genome Reorganization in Polyploids

Collares‐Pereira

Matos

Morgado-Santos

et al. 2013

Cytogenet Genome Res

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When comparing the known picture of polyploidy in animals and in plants, it is possible to recognize some similarities, namely: (i) multiple and recurrent origins in several well-established taxonomic groups; (ii) a strong and regular association with hybridization events; (iii) the production of genotypic diversity; (iv) a rapid genomic reshuffling; (v) a very active role of transposable elements in allopolyploids; (vi) a comparatively privileged occurrence in harsher environments when compared with their diploid relatives, and (vii) gene silencing and divergence of duplicated genes without disruption of duplicated loci. Research on polyploidy was highly biased towards plants during the last century because polyploidy in animals was for long time considered rare, occasional and irrelevant from an evolutionary perspective. However, as empirically observed in plants, genome rediploidization starts in polyploid organisms immediately after the polyploid shock. Given the speed and dynamicity of this process, evidence of genome multiplication is completely erased over time, and hence, only the most recent events are likely to be acknowledged. Although varying in expression between and within taxonomic groups, polyploidy and hybridization are ubiquitous in animals and may be recurrent, fostering evolution. Since evolutionary allopolyploid genomes behave as biologically diploid, zoologists have to challenge the old paradigm of an irrelevant evolutionary role in animals using current genomic and cytogenomic tools. These methods are most likely to reveal the role of polyploid mechanisms in producing evolutionary novelties. Nonsexual complexes are the perfect models to bridge the gap between empirical and theoretical research, while the evolutionary process is in action. Such animal complexes represent a transient stage that, in general, moves towards a polyploid stage, where bisexuality might be recovered, ultimately giving rise to a new gonochoric species. These pathways are herein illustrated by the Iberian allopolyploid Squalius alburnoides. Some general aspects on this fish's complex are updated and reviewed, namely the reproductive modes of the distinct genomotypes, since variable ploidies and genomic combinations occur in natural populations. Most recent data on the mechanisms of gene expression regulation and the importance of the genomic context in driving allelic expression are also included. It was first demonstrated that a regulatory mechanism involving dosage compensation by gene-copy silencing exists in allotriploid females and that allelic expression patterns differed either between genomically equivalent individuals or within the same individual (between tissues and genes). Thus, instead of a whole haplome inactivation, a biased silencing towards repression of a specific allele was observed as well as a reduction of the transcript levels to the diploid state. See also sister article focusing on plants by Tayalé and Parisod in this themed issue

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Section: Biology and Ecologymentioning

confidence: 71%

Natural Pathways towards Polyploidy in Animals: The Squalius alburnoides Fish Complex as a Model System to Study Genome Size and Genome Reorganization in Polyploids

Collares‐Pereira

Matos

Morgado-Santos

et al. 2013

Cytogenet Genome Res

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“…We compiled information on salinity preference for the 370 hermaphroditic species (details in the Supplementary information). We did not include Squalius alburnoides, Henicorhynchus lobatus and Crenicara punctulatum because lack of enough evidence to consider that hermaphroditism is their usual form of (Carruth 2000;Matos et al 2010;Collares-Pereira et al 2013).…”

Section: Distribution Of Hermaphroditism According To Water Salinitymentioning

confidence: 99%

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Pla

Maynou

Piferrer

2021

Rev Fish Biol Fisheries

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The distribution of hermaphroditism in fishes has traditionally been mainly explained by its dependence on biotic factors. However, correlates with major abiotic factors have not been investigated on a quantitative basis and at a global scale. Here, we determined the incidence of hermaphroditism in fish at the family and species level, tested the hypothesis that evolutionary relationships account for the poor presence of hermaphroditism in freshwater species, and tested the association of sexual systems with latitude, habitat type and depth. Functional hermaphroditism is reported in 8 orders, 34 families and 370 species of fishes, all teleosts. Sequential hermaphroditism predominates over simultaneous hermaphroditism at a ratio ~ 5:1 and protogyny (female-to-male sex change) predominates ~ 6:1 over protandry (male-to-female). We found 12 hermaphroditic species that can live in freshwater. However, seven of these species are from four primarily marine families while there are only five species from two mostly freshwater families. Protogynous and bi-directional sex changers have a tighter association with reef-associated tropical and subtropical habitats when compared to protandrous species, which tend to be more plastic in terms of distribution requirements. Finally, simultaneous hermaphrodite species live both in the deep sea and shallow waters in similar proportions. This study can be the basis for further research in specific groups for different purposes, including ecological and evolutionary issues as well as conservation and management of exploited species. Understanding the environmental correlates can help to forecast changes in the distribution or phenology of hermaphrodites in a global change scenario.

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Life Cycles in Marine Ornamental Species – Fishes as a Case Study

Olivotto

Leu

Blázquez

2017

Marine Ornamental Species Aquaculture

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Evidence for Hermaphroditism in the <i>Squalius alburnoides</i> Allopolyploid Fish Complex

Cited by 5 publications

References 42 publications

Natural Pathways towards Polyploidy in Animals: The <b><i>Squalius alburnoides</i></b> Fish Complex as a Model System to Study Genome Size and Genome Reorganization in Polyploids

Natural Pathways towards Polyploidy in Animals: The <b><i>Squalius alburnoides</i></b> Fish Complex as a Model System to Study Genome Size and Genome Reorganization in Polyploids

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Life Cycles in Marine Ornamental Species – Fishes as a Case Study

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