NDLI: Seasonal variation in infestations by ixodids on Siberian chipmunks: effects of host age, sex, and birth season

Content Provider	Springer Nature Link
Author	Le Coeur, Christie Robert, Alexandre Pisanu, Beît Chapuis, Jean Louis
Copyright Year	2015
Abstract	In mammalian hosts, macroparasite aggregation is highly heterogeneous over space and time and among individuals. While the exact causes of this heterogeneity remain unclear, it has mainly been attributed to individual differences in exposure and susceptibility. Although some extrinsic (e.g., parasite availability) and intrinsic (e.g., sex or age) factors are well known to affect infestation patterns, the joint and possibly interacting effects of these factors are poorly understood. Here, we study the infestation of hard ticks (mainly Ixodes ricinus) in a small rodent, the Siberian chipmunk (Tamias sibiricus), introduced to an oak-hornbeam forest in France. We investigate the seasonal variation in infestation according to the sex, age, birth season (spring-born or summer-born), and body weight of individual hosts while controlling for interannual variability. During the 10-year study period, 3421 tick count events were recorded involving 1017 chipmunks monitored by the capture-mark-recapture procedure. Our results reveal a male-biased parasitism in the Siberian chipmunk, which is not consistent among individuals born in different seasons. This sex bias is observed among spring-born juveniles from July to the beginning of hibernation. For adults, this difference becomes apparent along the reproduction period (May–September) for summer-born adults only. These complex interactions between sex, age, and birth season suggest overall that the seasonal variation of tick load is critically linked to the reproductive behavior of this small ground sciurid.
Starting Page	2069
Ending Page	2078
Page Count	10
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	114
Issue Number	6
e-ISSN	14321955
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Birth season Host-intrinsic factors Ixodes ricinus Rodent Sex-biased parasitism Tamias sibiricus Medical Microbiology Microbiology Immunology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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