Comparing individual and population measures of senescence across 10 years in a wild insect population

Rolando Rodríguez-Muñoz, Jelle J. Boonekamp, Xing P. Liu, Ian Skicko, Sophie Haugland Pedersen, David N. Fisher, Paul Hopwood, Tom Tregenza* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
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Abstract

Declines in survival and performance with advancing age (senescence) have been widely documented in natural populations, but whether patterns of senescence across traits reflect a common underlying process of biological ageing remains unclear. Senescence is typically characterized via assessments of the rate of change in mortality with age (actuarial senescence) or the rate of change in phenotypic performance with age (phenotypic senescence). Although both phenomena are considered indicative of underlying declines in somatic integrity, whether actuarial and phenotypic senescence rates are actually correlated has yet to be established. Here we present evidence of both actuarial and phenotypic senescence from a decade‐long longitudinal field study of wild insects. By tagging every individual and using continuous video monitoring with a network of up to 140 video cameras, we were able to record survival and behavioral data on an entire adult population of field crickets. This reveals that both actuarial and phenotypic senescence vary substantially across 10 annual generations. This variation allows us to identify a strong correlation between actuarial and phenotypic measures of senescence. Our study demonstrates age‐related phenotypic declines reflected in population level mortality rates and reveals that observations of senescence in a single year may not be representative of a general pattern.
Original languageEnglish
Pages (from-to)293-302
Number of pages10
JournalEvolution
Volume73
Issue number2
Early online date10 Jan 2019
DOIs
Publication statusPublished - Feb 2019

Bibliographical note

Acknowledgements
We thank L. Rodrıguez and M.C. Munoz for unconditional support,providing access to facilities including the WildCrickets study meadow.The following people contributed to video processing and data recording:Thor Veen, Carlos Rodrıguez del Valle, Alan Rees, Hannah Hudson,Jasmine Jenkin, Lauren Morse, Emma Rogan, Emelia Hiorns, Sarah Cal-low, Jamie Barnes, Chloe Mnatzaganian, Olivia Pearson, Adele James,Robin Brown, Chris Shipway, Luke Meadows and Peter Efstratiou. We also thank www.icode.co.uk for modifications to their i-catcher video recording package to optimize it for behavioral research. Michael Briga,Fernando Colchero, Dan Nussey, Andy Young, and Thor Veen made very useful comments on preliminary versions of the manuscript, and Jon Slate has been a constant partner in the development of the project. Comments from Jean-Michel Gaillard and Felix Zajitschek represented an important contribution to improve the manuscript. This work was supported bythe Natural Environment Research Council (NERC); standard grants:NE/E005403/1, NE/H02364X/1, NE/L003635/1, NE/R000328/1, andstudentships: NE/H02249X/1 (Fisher) and NE/L003635/1 (Skicko), the Leverhulme Trust and the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement CONSENT. 792215 (Boonekamp)

Keywords

  • BaSTA
  • demographic ageing
  • extrinsic mortality
  • intrinsic mortality
  • longevity
  • longitudinal study

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