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dc.contributor.authorCox, Ruth
dc.contributor.authorGroner, Maya
dc.contributor.authorTodd, Christopher David
dc.contributor.authorGettinby, George
dc.contributor.authorPatanasatienkul, Poo
dc.contributor.authorRevie, Crawford
dc.identifier.citationCox , R , Groner , M , Todd , C D , Gettinby , G , Patanasatienkul , P & Revie , C 2017 , ' Mate limitation in sea lice infesting wild salmon hosts : the influence of parasite sex ratio and aggregation ' , Ecosphere , vol. 8 , no. 12 , e02040 .
dc.identifier.otherPURE: 251541053
dc.identifier.otherPURE UUID: 4d0e661c-ce81-4dda-b857-ed30f4c78c72
dc.identifier.otherScopus: 85039695430
dc.identifier.otherORCID: /0000-0002-9690-2839/work/60427225
dc.identifier.otherWOS: 000423423200034
dc.descriptionResearch was undertaken thanks to funding from the SALMODIS project and the Canada Excellence Research Chairs Program. In particular, the CERC Aquatic Epidemiology Visiting Scientist initiative provided support for an extended visit by C.D.T. to work with colleagues at UPEI.en
dc.description.abstractMate limitation in dioecious parasite species has the potential to impact parasite population growth. Our focus of interest was the influence of parasite sex distribution amongst hosts on parasite reproduction, and transmission dynamics for populations of ectoparasitic sea lice (Lepeophtheirus salmonis Krøyer) establishing on wild juvenile salmon hosts. The data included more than 139,000 out-migrating juvenile pink salmon (Oncorhynchus gorbuscha (Walbaum)) and chum salmon (O. keta (Walbaum)) in British Columbia, Canada, sampled over nine years. For almost all years, the sex ratio of the reproductive stages of the sea lice was female-biased. The probability of a female being able to mate (i.e. of being attached to a fish also carrying a male louse) increased with increasing parasite abundance and parasite aggregation. We compared, with expected modelling predictions, the observed prevalence of pairs of sea lice (i.e. one reproductive louse of each sex) on a given fish, and the observed probability of a female being able to mate. These comparisons showed that male and female sea lice tend to be distributed ‘together’ rather than ‘separately’ on hosts. Distribution ‘together’ means that sea lice are distributed randomly on hosts according to a common negative binomial distribution, whereas distribution ‘separately’ means that males are distributed according to a negative 30 binomial and females are distributed in their own negative binomial among hosts. Despite the tendency for ‘distribution together’ we found that, in every year, at least 30% of reproductive female sea lice experience mate limitation. This Allee effect will result in sub-maximal rates of parasite reproduction at low parasite abundances and may limit parasite transmission. The work has important implications for salmon parasite management and the health both of captive farm salmon populations and migratory wild stocks. More broadly, these results demonstrate the potential impact of mate limitation as a constraint to the establishment and spread of wild ectoparasite populations.
dc.rights© 2017 Cox et al. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectMate limitationen
dc.subjectSex ratioen
dc.subjectHost-parasite interactionen
dc.subjectDioecious parasiteen
dc.subjectSea liceen
dc.subjectWild salmonen
dc.subjectQH301 Biologyen
dc.subjectQL Zoologyen
dc.titleMate limitation in sea lice infesting wild salmon hosts : the influence of parasite sex ratio and aggregationen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.description.statusPeer revieweden

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