Horizontal transmission of the ectoparasite Gyrodactylus arcuatus (Monogenea: Gyrodactylidae) to the next generation of the three-spined stickleback Gasterosteus aculeatus

Jaakko Lumme , Marek Ziętara

Abstract

In the parthenogenetic monogeneans of the genus Gyrodactylus Nordmann, 1832, the genetic diversity within or between hosts is determined by the relative roles of lateral transmission and clonal propagation. Clonality and limited transmission lead to high-amplitude metapopulation dynamics and strong genetic drift. In Baltic populations of the three-spined stickleback Gasterosteus aculeatus Linnaeus, the local mitochondrial diversity of Gyrodactylus arcuatus Bychowsky, 1933 is very high, and spatial differentia - tion weak. To understand the transmission dynamics in a single location, the transmission of the parasite from adults to next generation sticklebacks was investigated in a northern Baltic brackish water location. By sequencing 777 nt of cox1 , as many as 38 separate mito - chondrial haplotypes were identified. In August, the intensity of gyrodactylid infection on adult hosts was high, the haplotype diversity ( h ) was extreme and differentiation between fish was negligible (total h = 0.926, mean h = 0.938). In October, only 46% of the juvenile sticklebacks carried G. arcuatus . The number of parasites per young fish followed a Poisson distribution 0.92 ± 1.04 (mean ± SD) on October 2, and was clearly overdispersed 2.38 ± 5.00 on October 25. The total haplotype diversity of parasites on juveniles was nearly as high as in adults ( h = 0.916), but the mean per fish was only h = 0.364 ( F ST = 0.60), due to low intensity of infection and rapid clonal propagation of early arrivals. The initial first come first served advantage of the first gyrodactylid colonisers will be lost during the host adulthood via continuous transmission. Nesting and polygamy are suggested as factors maintaining the high genetic diversity of the parasite population. The transmission dynamics and, consequently, the population structure of Baltic G. arcuatus is fundamentally different from that of G. salaris Malmberg, 1957, on the Baltic salmon Salmo salar Linnaeus.
Author Jaakko Lumme
Jaakko Lumme,,
-
, Marek Ziętara (FB / DME)
Marek Ziętara,,
- Department of Molecular Evolution
Journal seriesFolia Parasitologica, ISSN 0015-5683, (A 20 pkt)
Issue year2018
Vol65
Pages1-8
Publication size in sheets0.5
Keywords in Englishclonal propagation, competition, parasite transition
DOIDOI:10.14411/fp.2018.006
URL https://folia.paru.cas.cz/pdfs/fol/2018/01/06.pdf
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)25
ScoreMinisterial score = 20.0, 25-04-2018, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 25-04-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.082 (2) - 2016=1.13 (5)
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