A Critical Reappraisal
Published online by Cambridge University Press: 14 November 2024
Longevity is one of the most variable life history traits among animals, ranging from days (e.g. adult mayflies) to centuries (e.g. the Greenland shark). Based on this variability, claims that some species display exceptional longevity are regularly published. Yet determining whether a species shows exceptional longevity or not is far from an easy task. For instance, longevity is (among other traits) associated with body mass, according to an allometric relationship, and a species displaying exceptional longevity should typically break this relationship. Longevity also corresponds to a biological time measuring the speed of the life cycle (often called pace of life) and should be isometrically linked with other biological times such as developmental time or age at first reproduction. From that perspective, a species displaying exceptional longevity should break these relationships as well. However, how much the observed longevity should differ from the predicted values for a given body mass or a given pace of life to be labelled as exceptional is fuzzy. Similarly, what is the threshold age at which a set of individuals displaying exceptional longevities can be identified? The aim of this chapter is to provide a critical reappraisal of some statistical methods used so far to determine whether a species or an individual shows exceptional longevity and then to provide a clear roadmap to identify such species and individuals. The analyses presented in this chapter are based on demographic databases on mammals and some exceptionally detailed case studies (on medflies, rhesus macaques and mole rats) at the individual level.
To save this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.