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Estimating effective population size for a cestode parasite infecting three-spined sticklebacks

Published online by Cambridge University Press:  05 February 2019

Hannah M. Strobel
Affiliation:
Department of Ecology and Evolutionary Biology, Tulane University, 6823 St. Charles Avenue, Lindy Boggs Building, Room 400, New Orleans, LA 70118, USA Division of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA
Sara J. Hays
Affiliation:
Department of Ecology and Evolutionary Biology, Tulane University, 6823 St. Charles Avenue, Lindy Boggs Building, Room 400, New Orleans, LA 70118, USA School of Medicine, Oregon Health and Science University, Portland, OR 97239, USA
Kristine N. Moody
Affiliation:
Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA The ByWater Institute, Tulane University, New Orleans, LA 70118, USA
Michael J. Blum
Affiliation:
Department of Ecology and Evolutionary Biology, Tulane University, 6823 St. Charles Avenue, Lindy Boggs Building, Room 400, New Orleans, LA 70118, USA Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA The ByWater Institute, Tulane University, New Orleans, LA 70118, USA
David C. Heins
Affiliation:
Department of Ecology and Evolutionary Biology, Tulane University, 6823 St. Charles Avenue, Lindy Boggs Building, Room 400, New Orleans, LA 70118, USA
Corresponding
E-mail address:

Abstract

Remarkably few attempts have been made to estimate contemporary effective population size (Ne) for parasitic species, despite the valuable perspectives it can offer on the tempo and pace of parasite evolution as well as coevolutionary dynamics of host–parasite interactions. In this study, we utilized multi-locus microsatellite data to derive single-sample and temporal estimates of contemporary Ne for a cestode parasite (Schistocephalus solidus) as well as three-spined stickleback hosts (Gasterosteus aculeatus) in lakes across Alaska. Consistent with prior studies, both approaches recovered small and highly variable estimates of parasite and host Ne. We also found that estimates of host Ne and parasite Ne were sensitive to assumptions about population genetic structure and connectivity. And, while prior work on the stickleback–cestode system indicates that physiographic factors external to stickleback hosts largely govern genetic variation in S. solidus, our findings indicate that stickleback host attributes and factors internal to the host – namely body length, genetic diversity and infection – shape contemporary Ne of cestode parasites.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2019 

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