Genetic diversity maintained in comparison of captive-propagated and wild populations of Lampsilis fasciola and Ptychobranchus fasciolaris (Bivalvia: Unionidae)1

We compared the genetic diversity and structure of wild versus captive-propagated at-risk species of freshwater mussels in Canada, Lampsilis fasciola (wavy-rayed lampmussel; WRL) and Ptychobranchus fasciolaris (kidneyshell; KS), using microsatellite-generated genotypes. No significant differences we...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2021-01, Vol.78 (9), p.1312-1320
Main Authors: VanTassel, Nichelle M, Morris, Todd J, Wilson, Christopher G, Zanatta, David T
Format: Article
Language:English
Subjects:
Expressed sequence tags
Genetic diversity
Genotypes
Lampsilis fasciola
Microsatellites
Mollusks
Mussels
Offspring
Population
Population genetics
Population number
Populations
Ptychobranchus fasciolaris
Structural analysis
Wave propagation
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Summary:We compared the genetic diversity and structure of wild versus captive-propagated at-risk species of freshwater mussels in Canada, Lampsilis fasciola (wavy-rayed lampmussel; WRL) and Ptychobranchus fasciolaris (kidneyshell; KS), using microsatellite-generated genotypes. No significant differences were detected using Kruskal–Wallis tests that compared the genetic diversity metrics of wild and captive-propagated WRL (from 12 mothers) and KS (from seven mothers). After effective population size (N e ) was estimated, considerable overlap was found in the estimated N e between wild and captive populations of both species. Pairwise F ST and D est values among wild WRL, hatchery-raised WRL juveniles, and across different time periods (2008–2018) were generally low (F ST  = 0.007–0.043, D est  = 0.005–0.282). Pairwise F ST and D est for KS were not significant and low (0.012, 0.017). When comparing captive-reared offspring with the wild population, STRUCTURE analysis revealed strong support for a single genetic population. With at least seven females contributing to brood stock, genetic diversity was maintained. Further research is needed to assess the male contribution to each glochidial brood as well as the variability of genetic diversity in individual glochidial broods.
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2020-0373