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Flea infestation, social contact, and stress in a gregarious rodent species: minimizing the potential parasitic costs of group-living

Published online by Cambridge University Press:  06 September 2019

Elizabeth M. Warburton Open the ORCID record for Elizabeth M. Warburton [Opens in a new window] ,
Irina S. Khokhlova ,
Rupert Palme ,
Elena N. Surkova ,
Luther van der Mescht  and
Boris R. Krasnov Open the ORCID record for Boris R. Krasnov [Opens in a new window]
Elizabeth M. Warburton*
Affiliation:
Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel
Irina S. Khokhlova
Affiliation:
Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel
Rupert Palme
Affiliation:
Department of Natural Sciences, Institute of Biochemistry, University of Veterinary Medicine, A-1210Vienna, Austria
Elena N. Surkova
Affiliation:
Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071Moscow, Russia
Luther van der Mescht
Affiliation:
Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel
Boris R. Krasnov
Affiliation:
Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 8499000 Midreshet Ben Gurion, Israel
*
Author for correspondence: Elizabeth M. Warburton, E-mail: warburte@post.bgu.ac.il
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Abstract

Both parasitism and social contact are common sources of stress that many gregarious species encounter in nature. Upon encountering such stressors, individuals secrete glucocorticoids and although short-term elevation of glucocorticoids is adaptive, long-term increases are correlated with higher mortality and deleterious reproductive effects. Here, we used an experimental host-parasite system, social rodents Acomys cahirinus and their characteristic fleas Parapulex chephrenis, in a fully-crossed design to test the effects of social contact and parasitism on stress during pregnancy. By analysing faecal glucocorticoid metabolites, we found that social hierarchy did not have a significant effect on glucocorticoid concentration. Rather, solitary females had significantly higher glucocorticoid levels than females housed in pairs. We found a significant interaction between the stressors of parasitism and social contact with solitary, uninfested females having the highest faecal glucocorticoid metabolite levels suggesting that both social contact and infestation mitigate allostatic load in pregnant rodents. Therefore, the increased risk of infestation that accompanies group-living could be outweighed by positive aspects of social contact within A. cahirinus colonies in nature.

Keywords

Acomys cahirinusglucocorticoidsParapulex chephrenisreproductionsocial hierarchy
Type
Research Article
Information
Parasitology , Volume 147 , Issue 1 , January 2020 , pp. 78 - 86
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Copyright
Copyright © Cambridge University Press 2019

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Footnotes

*

Present address: Department of Botany and Zoology, Evolutionary Genomics Group, Stellenbosch University, 7602 Stellenbosch, South Africa.

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