Examining the role of parasites in limiting unidirectional gene flow between lake and river sticklebacks.
Diplostomum pseudospathaceum
Schistocephalus solidus
ecological speciation
local adaptation
migration
parasite-mediated selection
reproductive isolation
stickleback
Journal
The Journal of animal ecology
ISSN: 1365-2656
Titre abrégé: J Anim Ecol
Pays: England
ID NLM: 0376574
Informations de publication
Date de publication:
12 2019
12 2019
Historique:
received:
13
04
2018
accepted:
09
07
2019
pubmed:
1
8
2019
medline:
18
12
2019
entrez:
1
8
2019
Statut:
ppublish
Résumé
Parasites are important selective agents with the potential to limit gene flow between host populations by shaping local host immunocompetence. We report on a contact zone between lake and river three-spined sticklebacks (Gasterosteus aculeatus) that offers the ideal biogeographic setting to explore the role of parasite-mediated selection on reproductive isolation. A waterfall acts as a natural barrier and enforces unidirectional migration from the upstream river stickleback population to the downstream river and lake populations. We assessed population genetic structure and parasite communities over four years. In a set of controlled experimental infections, we compared parasite susceptibility of upstream and downstream fish by exposing laboratory-bred upstream river and lake fish, as well as hybrids, to two common lake parasite species: a generalist trematode parasite, Diplostomum pseudospathaceum, and a host-specific cestode, Schistocephalus solidus. We found consistent genetic differentiation between upstream and downstream populations across four sampling years, even though the downstream river consisted of ~10% first-generation migrants from the upstream population as detected by parentage analysis. Fish in the upstream population had lower genetic diversity and were strikingly devoid of macroparasites. Through experimental infections, we demonstrated that upstream fish and their hybrids had higher susceptibility to parasite infections than downstream fish. Despite this, naturally sampled upstream migrants were less infected than downstream residents. Thus, migrants coming from a parasite-free environment may enjoy an initial fitness advantage, but their descendants seem likely to suffer from higher parasite loads. Our results suggest that adaptation to distinct parasite communities can influence stickleback invasion success and may represent a barrier to gene flow, even between close and connected populations.
Identifiants
pubmed: 31365124
doi: 10.1111/1365-2656.13080
doi:
Banques de données
Dryad
['10.5061/dryad.6837p85']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1986-1997Informations de copyright
© 2019 The Authors. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.
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