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Evolution and disappearance of sympatric Coregonus albula ina changing environment—A case study of the only remainingpopulation pair in Sweden
Swedish Museum of Natural History, Department of Zoology.
2019 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 9, no 22, p. 12727-12753Article in journal (Refereed) Published
Abstract [en]

During the past 50 years, Fennoscandian populations of spring‐spawning Baltic cisco

(

Coregonus albula), sympatric to common autumn‐spawners, have declined or disappeared;

for example, three out of four known spring‐spawning populations in Sweden

are regarded as extinct. Over the same period, the climate has changed and populations

have been subject to other anthropogenic stressors. We compared historic

(1960s) and recent (1990–000s) morphological data from the still‐existent sympatric

cisco populations in Lake Fegen, Sweden. Phenotypic changes were found for

spring‐spawners making them more similar to the sympatric autumn‐spawners that

had remained virtually unchanged. Based on results for other salmoniform fishes,

a phenotypically plastic response to increased temperature during early development

appears unlikely. The recent material was also analyzed with microsatellite

markers; long‐term effective population size in spring‐spawners was estimated to

be about 20 times lower than autumn‐spawners, with signs of long‐term gene flow

in both directions and a recent genetic bottleneck in spring‐spawners. We suggest

the change toward a less distinct phenotype in spring‐spawners to reflect a recent

increase in gene flow from autumn‐spawners. Time since divergence was estimated

to only

c. 1,900 years (95% CI: 400–5,900), but still the Fegen populations represent

the most morphologically and genetically distinct sympatric populations studied.

Consequently, we hypothesize that less distinct population pairs can be even

younger and that spring‐spawning may have repeatedly evolved and disappeared in

several lakes since the end of the last glaciation, concurrent with changed environmental

conditions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 9, no 22, p. 12727-12753
Keywords [en]
climate, Coregonus, microevolution, microsatellites, morphology
National Category
Evolutionary Biology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3441DOI: 10.1002/ece3.5745OAI: oai:DiVA.org:nrm-3441DiVA, id: diva2:1373790
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-12-02Bibliographically approved

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