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Mate limitation in sea lice infesting wild salmon hosts: the influence of parasite sex ratio and aggregation

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Mate limitation in sea lice infesting wild salmon hosts : the influence of parasite sex ratio and aggregation. / Cox, Ruth; Groner, Maya; Todd, Christopher David; Gettinby, George; Patanasatienkul, Poo; Revie, Crawford.

In: Ecosphere, Vol. 8, No. 12, e02040, 12.2017.

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Cox, R, Groner, M, Todd, CD, 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. https://doi.org/10.1002/ecs2.2040

APA

Cox, 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, 8(12), [e02040]. https://doi.org/10.1002/ecs2.2040

Vancouver

Cox R, Groner M, Todd CD, Gettinby G, Patanasatienkul P, Revie C. Mate limitation in sea lice infesting wild salmon hosts: the influence of parasite sex ratio and aggregation. Ecosphere. 2017 Dec;8(12). e02040. https://doi.org/10.1002/ecs2.2040

Author

Cox, Ruth ; Groner, Maya ; Todd, Christopher David ; Gettinby, George ; Patanasatienkul, Poo ; Revie, Crawford. / Mate limitation in sea lice infesting wild salmon hosts : the influence of parasite sex ratio and aggregation. In: Ecosphere. 2017 ; Vol. 8, No. 12.

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@article{4d0e661cce814ddab857ed30f4c78c72,
title = "Mate limitation in sea lice infesting wild salmon hosts: the influence of parasite sex ratio and aggregation",
abstract = "Mate 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 Kr{\o}yer) 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.",
keywords = "Mate limitation, Sex ratio, Host-parasite interaction, Dioecious parasite, Sea lice, Wild salmon",
author = "Ruth Cox and Maya Groner and Todd, {Christopher David} and George Gettinby and Poo Patanasatienkul and Crawford Revie",
note = "Research 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.",
year = "2017",
month = "12",
doi = "10.1002/ecs2.2040",
language = "English",
volume = "8",
journal = "Ecosphere",
issn = "2150-8925",
publisher = "Ecological Society of America",
number = "12",

}

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TY - JOUR

T1 - Mate limitation in sea lice infesting wild salmon hosts

T2 - Ecosphere

AU - Cox, Ruth

AU - Groner, Maya

AU - Todd, Christopher David

AU - Gettinby, George

AU - Patanasatienkul, Poo

AU - Revie, Crawford

N1 - Research 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.

PY - 2017/12

Y1 - 2017/12

N2 - Mate 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.

AB - Mate 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.

KW - Mate limitation

KW - Sex ratio

KW - Host-parasite interaction

KW - Dioecious parasite

KW - Sea lice

KW - Wild salmon

U2 - 10.1002/ecs2.2040

DO - 10.1002/ecs2.2040

M3 - Article

VL - 8

JO - Ecosphere

JF - Ecosphere

SN - 2150-8925

IS - 12

M1 - e02040

ER -

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ID: 251541053