Effects of mate separation in female and social isolation in male free-living Greylag geese on behavioural and physiological measures

Ludwig, Sonja C. and Kapetanopoulos, Katharina and Kotrschal, Kurt and Wascher, Claudia A.F. (2017) Effects of mate separation in female and social isolation in male free-living Greylag geese on behavioural and physiological measures. Behavioural Processes. ISSN 0376-6357

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Official URL: http://dx.doi.org/10.1016/j.beproc.2017.03.002

Abstract

The presence of a social partner may significantly contribute to coping with stressful events, whereas dyadic separation generally increases glucocorticoid levels and, thereby, might also affect immune function and health. To study the covariation between social factors, immuno-reactive corticosterone metabolites, haematology and parasite product excretion patterns in a free-living, long-term monogamous bird, we separated pair mates in Greylag geese (Anser anser). We isolated the males of eight pairs for 48 hours to examine behavioural, adrenocortical, haematological and parasitological responses to mate removal in the female partners, and to social isolation in the males. Females showed no elevated levels of corticosterone metabolites in their droppings, but their haematocrit decreased during mate removal, whereas leucocyte number and heterophil/lymphocyte (H/L) ratio remained unchanged. In contrast, the socially isolated males excreted significantly elevated levels of corticosterone metabolites compared to baseline and showed a decrease in haematocrit as well as elevated leucocyte number and H/L ratio. In both sexes, the excretion of coccidian oocysts increased within 48 hours of the start of the separation, remained high one week after separation, and returned to baseline four weeks later. Described effects were generally more pronounced in males than in females. Our results suggest relatively swift potential health effects of mate loss and social isolation in an unfamiliar confinement in free-living geese.

Item Type: Journal Article
Keywords: Mate removal, Social isolation, Adrenocortical activity
Faculty: Faculty of Science & Technology
Depositing User: Unnamed user with email Claudia.Wascher@anglia.ac.uk
Date Deposited: 10 Mar 2017 17:29
Last Modified: 12 Apr 2017 08:23
URI: http://arro.anglia.ac.uk/id/eprint/701571

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