What necropsy reports can tell us about menopausal and age-related changes in Western lowland gorillas (Gorilla gorilla gorilla)
This paper explores age-related post-mortem changes in zoo-housed gorillas. Our previous research examined hormonal changes in zoo-housed ageing western lowland gorilla (Gorilla gorilla gorilla) females in order to assess whether they experienced hormonal menopause. We had the opportunity to investigate whether these females showed post-mortem changes similar to those seen in ageing human females, and whether or not these changes are associated with general patterns of ageing, or hormone-mediated changes, or both. We reviewed necropsy reports for 14 females, ranging in age from 30 to 56 years at time of death. We evaluated all females for cardiovascular and reproductive tract anomalies. There were no significant differences in occurrence of cardiovascular disease (P = 0.256) or reproductive tract abnormalities (P = 1.00) between females considered to be menopausal at time of death and those for whom we could not definitively ascertain reproductive status. Females over 45 years of age were significantly more likely to exhibit reproductive tract pathologies (P = 0.031) than were females 45 and younger. To our knowledge, this is the first study to report on post-mortem changes in the reproductive tracts in aged gorillas. These findings highlight the importance of long-term monitoring and post-mortem follow-up to more clearly discern patterns in older females and to shed light for comparisons between taxa.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).