RT Journal Article
SR Electronic
T1 Effects of scent enrichment on behavioural and physiological indicators of stress in zoo primates – a preliminary study on red-ruffed lemurs and Lar gibbons
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2020.08.21.260679
DO 10.1101/2020.08.21.260679
A1 Stefano Vaglio
A1 Stefano S. K. Kaburu
A1 Christopher Young
A1 Richard Pearce
A1 Sarah Smith
A1 Beth Tompkins
A1 Emily Elwell
A1 Sara Fontani
A1 Giovanna Marliani
A1 Pier Attilio Accorsi
YR 2020
UL http://biorxiv.org/content/early/2020/08/21/2020.08.21.260679.abstract
AB Almost half of the primate species recognized today worldwide are classified as endangered or critically endangered in the wild. Captive breeding is vital for primate conservation, with modern zoos serving a crucial role as breeders of populations acting as buffers against extinction, ambassadors of endangered species, and educators of the general public. However, captive populations may experience welfare issues that may also undermine their breeding success. In order to design and test a new scent enrichment programme to enhance the breeding success and well-being of critically endangered zoo primates, we carried out a preliminary study to assess the effects of lavender on captive red-ruffed lemurs (Varecia rubra) and Lar gibbons (Hylobates lar) as these species presently show a low success rate in captive breeding and are critically endangered in the wild. We combined behavioural observations and faecal endocrinology analyses to assess the effects of lavender on two captive troops (N = 8) housed at Dudley Zoo and Castle (UK). We recorded observations of natural species-specific and abnormal stress-related behaviours for 144 hr using instantaneous scan sampling. We collected 78 faecal samples and measured the faecal cortisol concentrations using radioimmunoassay. We found a significant effect by the scent enrichment on social interactions and stress-related behaviours (i.e., pacing and self-scratching), with both species reducing their rates of stress-related behaviours after they were exposed to lavender. We also found that both species displayed a significant increase in faecal glucocorticoids following the exposure to lavender. Our findings suggest that lavender may work as scent enrichment to decrease the stress levels of zoo primates across the major lineages, but its effects might change depending on the species-specific social lives and olfactory repertoires of primates.