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Evolutionary Consequences of Hybridisation in Eukaryotes
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Evolutionary Consequences of Hybridisation in Eukaryotes

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Population and Evolutionary Genetics and Genomics".

Deadline for manuscript submissions: closed (8 November 2021) | Viewed by 14211

Special Issue Editor

Dr. Malgorzata Pilot

E-Mail Website
Guest Editor
Museum & Institute of Zoology, Polish Academy of Sciences, 00-679 Warszawa, Poland
Interests: evolutionary genomics; evolutionary response to environmental change; introgressive hybridisation; canid genetics

Special Issue Information

Dear colleagues,

Hybridisation, defined as breeding between representatives of distinct taxonomic units, has played a profound role in evolution. This role has been underappreciated until recent genomic studies showed that a broad range of eukaryotic species, from plants to fungi and animals, have experienced hybridisation events. Unless hybrids are sterile or unable to survive until reproductive age, hybridisation can lead to introgression, i.e., the intake of genetic variation characteristics of one species into another species’ gene pool. Introgressive hybridisation may have a broad range of outcomes, including (1) extinction via genetic swamping, outbreeding depression, or accumulation of deleterious variation; (2) evolutionary rescue via rapid acquisition of new adaptive variation, which enables recovery from environmental pressure, preventing extinction; (3) formation of hybrid zones or new hybrid species. Although signatures of introgressive hybridisation have been identified in multiple organisms, the factors determining specific outcomes of introgressive hybridisation remain largely unknown.

This Special Issue will present novel research on the evolutionary consequences of hybridisation in eukaryotic organisms. We aim to integrate empirical and theoretical studies focusing on the factors affecting the fitness of F1 hybrids and backcrosses, the viability of admixed populations, the admixture proportions after hybridisation events, as well as interactions between adaptive and neutral introgression, and other related topics.

Dr. Malgorzata Pilot
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Genes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Introgressive hybridisation
  • Genetic swamping
  • Evolutionary rescue
  • Adaptive introgression
  • Hybrid zones
  • Hybrid species
  • Admixed populations

Published Papers (2 papers)

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Research

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14 pages, 3980 KiB  
Article
Against the Odds: Hybrid Zones between Mangrove Killifish Species with Different Mating Systems
by Waldir M. Berbel-Filho, Andrey Tatarenkov, George Pacheco, Helder M. V. Espírito-Santo, Mateus G. Lira, Carlos Garcia de Leaniz, John C. Avise, Sergio M. Q. Lima, Carlos M. Rodríguez-López and Sofia Consuegra
Genes 2021, 12(10), 1486; https://doi.org/10.3390/genes12101486 - 24 Sep 2021
Cited by 5 | Viewed by 3457
Abstract
Different mating systems are expected to affect the extent and direction of hybridization. Due to the different levels of sexual conflict, the weak inbreeder/strong outbreeder (WISO) hypothesis predicts that gametes from self-incompatible (SI) species should outcompete gametes from self-compatible (SC) ones. However, other [...] Read more.
Different mating systems are expected to affect the extent and direction of hybridization. Due to the different levels of sexual conflict, the weak inbreeder/strong outbreeder (WISO) hypothesis predicts that gametes from self-incompatible (SI) species should outcompete gametes from self-compatible (SC) ones. However, other factors such as timing of selfing and unilateral incompatibilities may also play a role on the direction of hybridization. In addition, differential mating opportunities provided by different mating systems are also expected to affect the direction of introgression in hybrid zones involving outcrossers and selfers. Here, we explored these hypotheses with a unique case of recent hybridization between two mangrove killifish species with different mating systems, Kryptolebias ocellatus (obligately outcrossing) and K. hermaphroditus (predominantly self-fertilizing) in two hybrid zones in southeast Brazil. Hybridization rates were relatively high (~20%), representing the first example of natural hybridization between species with different mating systems in vertebrates. All F1 individuals were sired by the selfing species. Backcrossing was small, but mostly asymmetrical with the SI parental species, suggesting pattern commonly observed in plant hybrid zones with different mating systems. Our findings shed light on how contrasting mating systems may affect the direction and extent of gene flow between sympatric species, ultimately affecting the evolution and maintenance of hybrid zones. Full article
(This article belongs to the Special Issue Evolutionary Consequences of Hybridisation in Eukaryotes)
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Review

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26 pages, 1516 KiB  
Review
Consequences of Hybridization in Mammals: A Systematic Review
by Roya Adavoudi and Małgorzata Pilot
Genes 2022, 13(1), 50; https://doi.org/10.3390/genes13010050 - 24 Dec 2021
Cited by 32 | Viewed by 10026
Abstract
Hybridization, defined as breeding between two distinct taxonomic units, can have an important effect on the evolutionary patterns in cross-breeding taxa. Although interspecific hybridization has frequently been considered as a maladaptive process, which threatens species genetic integrity and survival via genetic swamping and [...] Read more.
Hybridization, defined as breeding between two distinct taxonomic units, can have an important effect on the evolutionary patterns in cross-breeding taxa. Although interspecific hybridization has frequently been considered as a maladaptive process, which threatens species genetic integrity and survival via genetic swamping and outbreeding depression, in some cases hybridization can introduce novel adaptive variation and increase fitness. Most studies to date focused on documenting hybridization events and analyzing their causes, while relatively little is known about the consequences of hybridization and its impact on the parental species. To address this knowledge gap, we conducted a systematic review of studies on hybridization in mammals published in 2010–2021, and identified 115 relevant studies. Of 13 categories of hybridization consequences described in these studies, the most common negative consequence (21% of studies) was genetic swamping and the most common positive consequence (8%) was the gain of novel adaptive variation. The total frequency of negative consequences (49%) was higher than positive (13%) and neutral (38%) consequences. These frequencies are biased by the detection possibilities of microsatellite loci, the most common genetic markers used in the papers assessed. As negative outcomes are typically easier to demonstrate than positive ones (e.g., extinction vs hybrid speciation), they may be over-represented in publications. Transition towards genomic studies involving both neutral and adaptive variation will provide a better insight into the real impacts of hybridization. Full article
(This article belongs to the Special Issue Evolutionary Consequences of Hybridisation in Eukaryotes)
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