Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations
Besnoitia tarandi has been documented in free-ranging reindeer and caribou (Rangifer tarandus spp.) since 1922 throughout their arctic and subarctic ranges; however, very little is known about its epidemiology. We evaluated variables associated with B. tarandi prevalence and cyst density with the us...
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fttriple:oai:gotriple.eu:http://hdl.handle.net/20.500.11794/40089 2023-05-15T15:12:11+02:00 Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations Ducrocq, Julie Beauchamp, Guy Kutz, Susan Simard, Manon Taillon, Joëlle Côté, Steeve D. Brodeur, Vincent Lair, Stéphane Québec (Province) 2013-01-01 https://hdl.handle.net/20.500.11794/40089 en eng Wildlife Disease Association, Inc. http://hdl.handle.net/20.500.11794/40089 other CorpusUL envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/20.500.11794/40089 2023-01-22T17:31:42Z Besnoitia tarandi has been documented in free-ranging reindeer and caribou (Rangifer tarandus spp.) since 1922 throughout their arctic and subarctic ranges; however, very little is known about its epidemiology. We evaluated variables associated with B. tarandi prevalence and cyst density with the use of barren-ground caribou (Rangifer tarandus) from two migratory herds in northern Quebec: the Rivière-aux-Feuilles and the Rivière-George herds. Diagnosis of infection was made upon the microscopic observation of characteristic cysts in a formalin-fixed section of skin from the anterior aspect of the metatarsus. The density of cysts (number of B. tarandi cysts/mm2) was calculated in a section of the dermis extending from the epidermis of the skin to the base of the hair follicles and adnexal structures. Statistically significant associations between B. tarandi prevalence and cyst density, sex, age, and time of harvest were observed. Male caribou had a slightly higher prevalence compared to females, whereas cyst densities were similar between sexes. We found a nonlinear increase in the odds of infection by B. tarandi by age combined with the opposite trend for intensity of infection. Higher B. tarandi prevalence was observed in caribou sampled in the fall compared to June of the same year, suggesting that transmission is increased during the summer. Higher densities of cysts observed during the fall compared to June of the following year may be the result of the elimination of B. tarandi cysts from the dermis during the winter, or lower winter survival of heavily infected caribou. Comparisons of B. tarandi prevalence and density across herds should take into account these different variables. Article in Journal/Newspaper Arctic Rangifer tarandus Rivière aux Feuilles Subarctic Unknown Arctic Rivière aux Feuilles ENVELOPE(-70.065,-70.065,58.784,58.784) Rivière George ENVELOPE(-66.165,-66.165,58.817,58.817) |
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English |
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envir geo Ducrocq, Julie Beauchamp, Guy Kutz, Susan Simard, Manon Taillon, Joëlle Côté, Steeve D. Brodeur, Vincent Lair, Stéphane Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
topic_facet |
envir geo |
description |
Besnoitia tarandi has been documented in free-ranging reindeer and caribou (Rangifer tarandus spp.) since 1922 throughout their arctic and subarctic ranges; however, very little is known about its epidemiology. We evaluated variables associated with B. tarandi prevalence and cyst density with the use of barren-ground caribou (Rangifer tarandus) from two migratory herds in northern Quebec: the Rivière-aux-Feuilles and the Rivière-George herds. Diagnosis of infection was made upon the microscopic observation of characteristic cysts in a formalin-fixed section of skin from the anterior aspect of the metatarsus. The density of cysts (number of B. tarandi cysts/mm2) was calculated in a section of the dermis extending from the epidermis of the skin to the base of the hair follicles and adnexal structures. Statistically significant associations between B. tarandi prevalence and cyst density, sex, age, and time of harvest were observed. Male caribou had a slightly higher prevalence compared to females, whereas cyst densities were similar between sexes. We found a nonlinear increase in the odds of infection by B. tarandi by age combined with the opposite trend for intensity of infection. Higher B. tarandi prevalence was observed in caribou sampled in the fall compared to June of the same year, suggesting that transmission is increased during the summer. Higher densities of cysts observed during the fall compared to June of the following year may be the result of the elimination of B. tarandi cysts from the dermis during the winter, or lower winter survival of heavily infected caribou. Comparisons of B. tarandi prevalence and density across herds should take into account these different variables. |
format |
Article in Journal/Newspaper |
author |
Ducrocq, Julie Beauchamp, Guy Kutz, Susan Simard, Manon Taillon, Joëlle Côté, Steeve D. Brodeur, Vincent Lair, Stéphane |
author_facet |
Ducrocq, Julie Beauchamp, Guy Kutz, Susan Simard, Manon Taillon, Joëlle Côté, Steeve D. Brodeur, Vincent Lair, Stéphane |
author_sort |
Ducrocq, Julie |
title |
Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
title_short |
Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
title_full |
Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
title_fullStr |
Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
title_full_unstemmed |
Variables associated with Besnoitia tarandi prevalence and cyst density in barren-ground caribou (Rangifer tarandus) populations |
title_sort |
variables associated with besnoitia tarandi prevalence and cyst density in barren-ground caribou (rangifer tarandus) populations |
publisher |
Wildlife Disease Association, Inc. |
publishDate |
2013 |
url |
https://hdl.handle.net/20.500.11794/40089 |
op_coverage |
Québec (Province) |
long_lat |
ENVELOPE(-70.065,-70.065,58.784,58.784) ENVELOPE(-66.165,-66.165,58.817,58.817) |
geographic |
Arctic Rivière aux Feuilles Rivière George |
geographic_facet |
Arctic Rivière aux Feuilles Rivière George |
genre |
Arctic Rangifer tarandus Rivière aux Feuilles Subarctic |
genre_facet |
Arctic Rangifer tarandus Rivière aux Feuilles Subarctic |
op_source |
CorpusUL |
op_relation |
http://hdl.handle.net/20.500.11794/40089 |
op_rights |
other |
op_doi |
https://doi.org/20.500.11794/40089 |
_version_ |
1766342913101398016 |