Development of reproductive barriers in sympatry

Freshwater zooplankter Brachionus plicatilis is able to inhabit different habitats and locally adapt to their environmental conditions. It also shows a high degree of population structuring in small geographical regions. Here we try to shed light on the evolution of reproductive isolation in populat...

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Bibliographic Details
Published in:Hydrobiologia 2024-07, Vol.851 (12-13), p.2927-2936
Main Authors: Jezkova, Ivana, Montero-Pau, Javier, Ortells, Raquel, Serra, Manuel
Format: Article
Language:English
Subjects:
Adaptation
Algae
Animal reproduction
Biomedical and Life Sciences
Cloning
Distance
Ecology
Environmental conditions
Females
Floods
Freshwater
Freshwater & Marine Ecology
Gene flow
Genotypes
Heterozygotes
Inbreeding
Inland water environment
Laboratory experimentation
Life Sciences
Marine invertebrates
Ponds
Populations
Reproductive isolation
Rotifera XVI
Sexual reproduction
Sympatry
Zoology
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Summary:Freshwater zooplankter Brachionus plicatilis is able to inhabit different habitats and locally adapt to their environmental conditions. It also shows a high degree of population structuring in small geographical regions. Here we try to shed light on the evolution of reproductive isolation in populations of B. plicatilis with presumptive gene flow among locally adapted populations. We have conducted laboratory experiments on admixed pairwise populations that differ in predictability of the water regime. We have assessed the potential for within-population reproductive preferences as a deviation of genotypes from Hardy–Weinberg equilibrium in diapausing eggs, a product of sexual reproduction. We expected heterozygote deficit to increase with environmental distance. We have found signs for incipient reproductive isolation in one third of our admixed populations, however no correlation with environmental distance was found, nor with genetic or geographic predictor variables. The overall inbreeding coefficient showed a tendency for within-population crosses preferences to decrease over time.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-023-05233-3