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Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians

Risks of parasitism vary over time, with infection prevalence often fluctuating with seasonal changes in the annual cycle. Identifying the biological mechanisms underlying seasonality in infection can enable better prediction and prevention of future infection peaks. Obtaining longitudinal data on i...

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Autores principales: Daversa, David R., Monsalve-Carcaño, Camino, Carrascal, Luis M., Bosch, Jaime
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5947160/
https://www.ncbi.nlm.nih.gov/pubmed/29761041
http://dx.doi.org/10.7717/peerj.4698
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author Daversa, David R.
Monsalve-Carcaño, Camino
Carrascal, Luis M.
Bosch, Jaime
author_facet Daversa, David R.
Monsalve-Carcaño, Camino
Carrascal, Luis M.
Bosch, Jaime
author_sort Daversa, David R.
collection PubMed
description Risks of parasitism vary over time, with infection prevalence often fluctuating with seasonal changes in the annual cycle. Identifying the biological mechanisms underlying seasonality in infection can enable better prediction and prevention of future infection peaks. Obtaining longitudinal data on individual infections and traits across seasons throughout the annual cycle is perhaps the most effective means of achieving this aim, yet few studies have obtained such information for wildlife. Here, we tracked spiny common toads (Bufo spinosus) within and across annual cycles to assess seasonal variation in movement, body temperatures and infection from the fungal parasite, Batrachochytrium dendrobatidis (Bd). Across annual cycles, toads did not consistently sustain infections but instead gained and lost infections from year to year. Radio-tracking showed that infected toads lose infections during post-breeding migrations, and no toads contracted infection following migration, which may be one explanation for the inter-annual variability in Bd infections. We also found pronounced seasonal variation in toad body temperatures. Body temperatures approached 0 °C during winter hibernation but remained largely within the thermal tolerance range of Bd. These findings provide direct documentation of migratory recovery (i.e., loss of infection during migration) and escape in a wild population. The body temperature reductions that we observed during hibernation warrant further consideration into the role that this period plays in seasonal Bd dynamics.
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spelling pubmed-59471602018-05-14 Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians Daversa, David R. Monsalve-Carcaño, Camino Carrascal, Luis M. Bosch, Jaime PeerJ Conservation Biology Risks of parasitism vary over time, with infection prevalence often fluctuating with seasonal changes in the annual cycle. Identifying the biological mechanisms underlying seasonality in infection can enable better prediction and prevention of future infection peaks. Obtaining longitudinal data on individual infections and traits across seasons throughout the annual cycle is perhaps the most effective means of achieving this aim, yet few studies have obtained such information for wildlife. Here, we tracked spiny common toads (Bufo spinosus) within and across annual cycles to assess seasonal variation in movement, body temperatures and infection from the fungal parasite, Batrachochytrium dendrobatidis (Bd). Across annual cycles, toads did not consistently sustain infections but instead gained and lost infections from year to year. Radio-tracking showed that infected toads lose infections during post-breeding migrations, and no toads contracted infection following migration, which may be one explanation for the inter-annual variability in Bd infections. We also found pronounced seasonal variation in toad body temperatures. Body temperatures approached 0 °C during winter hibernation but remained largely within the thermal tolerance range of Bd. These findings provide direct documentation of migratory recovery (i.e., loss of infection during migration) and escape in a wild population. The body temperature reductions that we observed during hibernation warrant further consideration into the role that this period plays in seasonal Bd dynamics. PeerJ Inc. 2018-05-08 /pmc/articles/PMC5947160/ /pubmed/29761041 http://dx.doi.org/10.7717/peerj.4698 Text en ©2018 Daversa et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Conservation Biology
Daversa, David R.
Monsalve-Carcaño, Camino
Carrascal, Luis M.
Bosch, Jaime
Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title_full Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title_fullStr Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title_full_unstemmed Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title_short Seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
title_sort seasonal migrations, body temperature fluctuations, and infection dynamics in adult amphibians
topic Conservation Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5947160/
https://www.ncbi.nlm.nih.gov/pubmed/29761041
http://dx.doi.org/10.7717/peerj.4698
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