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Inferring the rules of social interaction in migrating caribou.

https://arctichealth.org/en/permalink/ahliterature290825
Source
Philos Trans R Soc Lond B Biol Sci. 2018 May 19; 373(1746):
Publication Type
Journal Article
Date
May-19-2018
Author
Colin J Torney
Myles Lamont
Leon Debell
Ryan J Angohiatok
Lisa-Marie Leclerc
Andrew M Berdahl
Author Affiliation
School of Mathematics and Statistics, University of Glasgow, Glasgow G12 8QW, UK colin.torney@glasgow.ac.uk.
Source
Philos Trans R Soc Lond B Biol Sci. 2018 May 19; 373(1746):
Date
May-19-2018
Language
English
Publication Type
Journal Article
Abstract
Social interactions are a significant factor that influence the decision-making of species ranging from humans to bacteria. In the context of animal migration, social interactions may lead to improved decision-making, greater ability to respond to environmental cues, and the cultural transmission of optimal routes. Despite their significance, the precise nature of social interactions in migrating species remains largely unknown. Here we deploy unmanned aerial systems to collect aerial footage of caribou as they undertake their migration from Victoria Island to mainland Canada. Through a Bayesian analysis of trajectories we reveal the fine-scale interaction rules of migrating caribou and show they are attracted to one another and copy directional choices of neighbours, but do not interact through clearly defined metric or topological interaction ranges. By explicitly considering the role of social information on movement decisions we construct a map of near neighbour influence that quantifies the nature of information flow in these herds. These results will inform more realistic, mechanism-based models of migration in caribou and other social ungulates, leading to better predictions of spatial use patterns and responses to changing environmental conditions. Moreover, we anticipate that the protocol we developed here will be broadly applicable to study social behaviour in a wide range of migratory and non-migratory taxa.This article is part of the theme issue 'Collective movement ecology'.
Notes
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PubMed ID
29581404 View in PubMed
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Morphological keys to advance the understanding of protostrongylid biodiversity in caribou (Rangifer spp.) at high latitudes.

https://arctichealth.org/en/permalink/ahliterature287142
Source
Int J Parasitol Parasites Wildl. 2017 Dec;6(3):331-339
Publication Type
Article
Date
Dec-2017
Author
Pratap Kafle
Lisa-Marie Leclerc
Morgan Anderson
Tracy Davison
Manigandan Lejeune
Susan Kutz
Source
Int J Parasitol Parasites Wildl. 2017 Dec;6(3):331-339
Date
Dec-2017
Language
English
Publication Type
Article
Abstract
The Protostrongylidae is a diverse family of nematodes capable of causing significant respiratory and neuromuscular disease in their ungulate and lagomorph hosts. Establishing the species diversity and abundance of the protostrongylid fauna has been hindered because the first stage larvae, commonly referred as dorsal spined larvae (DSL), that are shed in the feces are morphologically very similar among several genera. We aimed to determine the protostrongylid diversity and distribution in caribou (Rangifer tarandus groenlandicus and R. t. pearyi) in the central and high Canadian Arctic. We first developed, tested and validated a morphological diagnostic guide for the DSL of two important protostrongylids, Parelaphostrongylus andersoni and Varestrongylus eleguneniensis, and then applied this guide to determine the prevalence and intensity of infection of these parasites in fecal samples from 242 caribou. We found that DSL of V. eleguneniensis and P. andersoni can be differentiated morphologically based on the structural differences at the caudal extremity. The presentation and morphology of the dorsal spine, and caudoventral bulging at the start of the tail extension were identified as the key identifying features. The two species were found in caribou on the arctic mainland and southern Victoria Island in single and co-infections, but the prevalence and intensity of infection was low. No protostrongylids were detected in caribou from the high arctic islands. Through this study, we provide a simple, efficient, and robust method to distinguish the DSL of the two protostrongylids, and present the current status of infection in different herds of caribou of the central Canadian Arctic. We report new geographic and host records for P. andersoni infection in Dolphin and Union caribou herd.
Notes
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PubMed ID
29159064 View in PubMed
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Qiviut cortisol in muskoxen as a potential tool for informing conservation strategies.

https://arctichealth.org/en/permalink/ahliterature286046
Source
Conserv Physiol. 2017;5(1):cox052
Publication Type
Article
Date
2017
Author
Juliette Di Francesco
Nora Navarro-Gonzalez
Katherine Wynne-Edwards
Stephanie Peacock
Lisa-Marie Leclerc
Matilde Tomaselli
Tracy Davison
Anja Carlsson
Susan Kutz
Source
Conserv Physiol. 2017;5(1):cox052
Date
2017
Language
English
Publication Type
Article
Abstract
Muskoxen (Ovibos moschatus) are increasingly subject to multiple new stressors associated with unprecedented climate change and increased anthropogenic activities across much of their range. Hair may provide a measurement of stress hormones (glucocorticoids) over periods of weeks to months. We developed a reliable method to quantify cortisol in the qiviut (wooly undercoat) of muskoxen using liquid chromatography coupled to tandem mass spectrometry. We then applied this technique to determine the natural variability in qiviut cortisol levels among 150 wild muskoxen, and to assess differences between sexes, seasons and years of collection. Qiviut samples were collected from the rump of adult muskoxen by subsistence and sport hunters in seven different locations in Nunavut and the Northwest Territories between 2013 and 2016. Results showed a high inter-individual variability in qiviut cortisol concentrations, with levels ranging from 3.5 to 48.9 pg/mg (median 11.7 pg/mg). Qiviut cortisol levels were significantly higher in males than females, and varied seasonally (summer levels were significantly lower than in fall and winter), and by year (levels significantly increased from 2013 to 2015). These differences may reflect distinct environmental conditions and the diverse stressors experienced, as well as physiological and/or behavioural characteristics. Quantification of qiviut cortisol may serve as a valuable tool for monitoring health and informing conservation and management efforts.
Notes
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PubMed ID
28948023 View in PubMed
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