Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis
Abstract Argulus canadensis is a crustacean ectoparasite observed increasingly on wild migrating adult Atlantic salmon. We investigated temperature and salinity tolerance regarding development, survival and hatch of A. canadensis eggs to help understand spatiotemporal features of transmission. Argul...
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Online Access: | http://dx.doi.org/10.1017/s0031182020001766 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182020001766 |
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crcambridgeupr:10.1017/s0031182020001766 2024-03-03T08:42:47+00:00 Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis Lynn, Tyler J. Jeong, Ji-Won Duffy, Michael S. 2020 http://dx.doi.org/10.1017/s0031182020001766 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182020001766 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Parasitology volume 147, issue 14, page 1774-1785 ISSN 0031-1820 1469-8161 Infectious Diseases Animal Science and Zoology Parasitology journal-article 2020 crcambridgeupr https://doi.org/10.1017/s0031182020001766 2024-02-08T08:41:23Z Abstract Argulus canadensis is a crustacean ectoparasite observed increasingly on wild migrating adult Atlantic salmon. We investigated temperature and salinity tolerance regarding development, survival and hatch of A. canadensis eggs to help understand spatiotemporal features of transmission. Argulus canadensis eggs differentiate to pharate embryos by 35 days buttheir hatch is protracted to ~7 months. Cold treatment ⩾75 days mimics overwintering and terminates egg diapause, with 84.6% (72.1–100%) metanauplius hatch induced ⩾13 °C and synchronized to 3–4 weeks. Inter- and intra-clutch variability and protracted hatch in the absence of cold-temperature termination of diapause is compatible with bet hedging. Whereas diapause likely promotes phenological synchrony for host colocalization, bet hedging could afford temporal plasticity to promote host encounter during environmental change. Our egg storage and hatch induction/synchronization methodologies can be exploited for empirical investigations. Salinity tolerance reveals both significantly higher embryonic development (94.4 ± 3.5% vs 61.7 ± 24.6%) and metanauplius hatch (53.3 ± 7.5% vs 10.1 ± 8.2%) for eggs in freshwater than at 17 ppt. Unhatched embryos were alive in freshwater by the end of the trial (213 days) but were dead/dying at 17 ppt. Eggs did not develop at 34 ppt. Salinity tolerance of A. canadensis eggs supports riverine transmission to adult Atlantic salmon during return to freshwater for mating each year. Article in Journal/Newspaper Atlantic salmon Cambridge University Press Parasitology 147 14 1774 1785 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Infectious Diseases Animal Science and Zoology Parasitology |
spellingShingle |
Infectious Diseases Animal Science and Zoology Parasitology Lynn, Tyler J. Jeong, Ji-Won Duffy, Michael S. Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
topic_facet |
Infectious Diseases Animal Science and Zoology Parasitology |
description |
Abstract Argulus canadensis is a crustacean ectoparasite observed increasingly on wild migrating adult Atlantic salmon. We investigated temperature and salinity tolerance regarding development, survival and hatch of A. canadensis eggs to help understand spatiotemporal features of transmission. Argulus canadensis eggs differentiate to pharate embryos by 35 days buttheir hatch is protracted to ~7 months. Cold treatment ⩾75 days mimics overwintering and terminates egg diapause, with 84.6% (72.1–100%) metanauplius hatch induced ⩾13 °C and synchronized to 3–4 weeks. Inter- and intra-clutch variability and protracted hatch in the absence of cold-temperature termination of diapause is compatible with bet hedging. Whereas diapause likely promotes phenological synchrony for host colocalization, bet hedging could afford temporal plasticity to promote host encounter during environmental change. Our egg storage and hatch induction/synchronization methodologies can be exploited for empirical investigations. Salinity tolerance reveals both significantly higher embryonic development (94.4 ± 3.5% vs 61.7 ± 24.6%) and metanauplius hatch (53.3 ± 7.5% vs 10.1 ± 8.2%) for eggs in freshwater than at 17 ppt. Unhatched embryos were alive in freshwater by the end of the trial (213 days) but were dead/dying at 17 ppt. Eggs did not develop at 34 ppt. Salinity tolerance of A. canadensis eggs supports riverine transmission to adult Atlantic salmon during return to freshwater for mating each year. |
format |
Article in Journal/Newspaper |
author |
Lynn, Tyler J. Jeong, Ji-Won Duffy, Michael S. |
author_facet |
Lynn, Tyler J. Jeong, Ji-Won Duffy, Michael S. |
author_sort |
Lynn, Tyler J. |
title |
Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
title_short |
Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
title_full |
Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
title_fullStr |
Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
title_full_unstemmed |
Bet hedging and cold-temperature termination of diapause in the life history of the Atlantic salmon ectoparasite Argulus canadensis |
title_sort |
bet hedging and cold-temperature termination of diapause in the life history of the atlantic salmon ectoparasite argulus canadensis |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/s0031182020001766 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182020001766 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Parasitology volume 147, issue 14, page 1774-1785 ISSN 0031-1820 1469-8161 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0031182020001766 |
container_title |
Parasitology |
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147 |
container_issue |
14 |
container_start_page |
1774 |
op_container_end_page |
1785 |
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1792498236874817536 |