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Can cryptic female choice prevent invasive hybridization in external fertilizing fish?

Polyandrous mating systems result in females mating with multiple males, generating opportunities for strong pre‐mating and post‐mating sexual selection. Polyandry also creates the potential for unintended matings and subsequent sperm competition with hybridizing species. Cryptic female choice allow...

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Detalles Bibliográficos
Autores principales: Lantiegne, Tyler H., Purchase, Craig F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10445091/
https://www.ncbi.nlm.nih.gov/pubmed/37622094
http://dx.doi.org/10.1111/eva.13573
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author Lantiegne, Tyler H.
Purchase, Craig F.
author_facet Lantiegne, Tyler H.
Purchase, Craig F.
author_sort Lantiegne, Tyler H.
collection PubMed
description Polyandrous mating systems result in females mating with multiple males, generating opportunities for strong pre‐mating and post‐mating sexual selection. Polyandry also creates the potential for unintended matings and subsequent sperm competition with hybridizing species. Cryptic female choice allows females to bias paternity towards preferred males under sperm competition and may include conspecific sperm preference when under hybridization risk. The potential for hybridization becomes particularly important in context of invasive species that can novelly hybridize with natives, and by definition, have evolved allopatrically. We provide the first examination of conspecific sperm preference in a system of three species with the potential to hybridize: North American native Atlantic salmon (Salmo salar) and brook char (Salvelinus fontinalis), and invasive brown trout (Salmo trutta) from Europe. Using naturalized populations on the island of Newfoundland, we measured changes in sperm swimming performance, a known predictor of paternity, to determine the degree of modification in sperm swimming to female cues related to conspecific sperm preference. Compared to water alone, female ovarian fluid in general had a pronounced effect and changed sperm motility (by a mean of 53%) and swimming velocity (mean 30%), but not linearity (mean 6%). However, patterns in the degree of modification suggest there is no conspecific sperm preference in the North American populations. Furthermore, female cues from both native species tended to boost the sperm of invasive males more than their own. We conclude that cryptic female choice via ovarian fluid mediated sperm swimming modification is too weak in this system to prevent invasive hybridization and is likely insufficient to promote or maintain reproductive isolation between the native North American species.
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spelling pubmed-104450912023-08-24 Can cryptic female choice prevent invasive hybridization in external fertilizing fish? Lantiegne, Tyler H. Purchase, Craig F. Evol Appl Original Articles Polyandrous mating systems result in females mating with multiple males, generating opportunities for strong pre‐mating and post‐mating sexual selection. Polyandry also creates the potential for unintended matings and subsequent sperm competition with hybridizing species. Cryptic female choice allows females to bias paternity towards preferred males under sperm competition and may include conspecific sperm preference when under hybridization risk. The potential for hybridization becomes particularly important in context of invasive species that can novelly hybridize with natives, and by definition, have evolved allopatrically. We provide the first examination of conspecific sperm preference in a system of three species with the potential to hybridize: North American native Atlantic salmon (Salmo salar) and brook char (Salvelinus fontinalis), and invasive brown trout (Salmo trutta) from Europe. Using naturalized populations on the island of Newfoundland, we measured changes in sperm swimming performance, a known predictor of paternity, to determine the degree of modification in sperm swimming to female cues related to conspecific sperm preference. Compared to water alone, female ovarian fluid in general had a pronounced effect and changed sperm motility (by a mean of 53%) and swimming velocity (mean 30%), but not linearity (mean 6%). However, patterns in the degree of modification suggest there is no conspecific sperm preference in the North American populations. Furthermore, female cues from both native species tended to boost the sperm of invasive males more than their own. We conclude that cryptic female choice via ovarian fluid mediated sperm swimming modification is too weak in this system to prevent invasive hybridization and is likely insufficient to promote or maintain reproductive isolation between the native North American species. John Wiley and Sons Inc. 2023-07-13 /pmc/articles/PMC10445091/ /pubmed/37622094 http://dx.doi.org/10.1111/eva.13573 Text en © 2023 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Lantiegne, Tyler H.
Purchase, Craig F.
Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title_full Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title_fullStr Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title_full_unstemmed Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title_short Can cryptic female choice prevent invasive hybridization in external fertilizing fish?
title_sort can cryptic female choice prevent invasive hybridization in external fertilizing fish?
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10445091/
https://www.ncbi.nlm.nih.gov/pubmed/37622094
http://dx.doi.org/10.1111/eva.13573
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