Drivers of age-specific survival in a long-lived seabird: contributions of observed and hidden sources of heterogeneity

• Published in: Journal of Animal Ecology
• Main Authors: Aubry, Lise, Cam, Emmanuelle, Koons, David, Monnat, Jean-Yves, Pavard, Samuel
• Other Authors: Max Planck Institute for Demographic Research (MPIDR), Max-Planck-Gesellschaft, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Utah State University (USU), Eco-Anthropologie et Ethnobiologie (EAE), Muséum national d'Histoire naturelle (MNHN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2011
• Subjects: MESH: Aging; MESH: Animals; MESH: Charadriiformes; MESH: Models; Biological; MESH: Population Dynamics; MESH: Reproduction; [SDV]Life Sciences [q-bio]; [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]; Black-legged Kittiwake
• Online Access: https://mnhn.hal.science/mnhn-02282864; https://doi.org/10.1111/j.1365-2656.2010.01784.x

International audience 1. We assessed the relative influence of variability in recruitment age, dynamic reproductive investment(time-specific reproductive states) and frailty (unobserved differences in survival abilitiesacross individuals) on survival in the black-legged kittiwake. Furthermore, we examined whetherobserved variability in survival trajectories was best explained by immediate reproductive investment,cumulative investment, or both.2. Individuals that delayed recruitment (‡ age 7) suffered a higher mortality risk than early recruits(age 3), especially later in life, suggesting that recruitment age may be an indicator of individualquality. Although recruitment age helped explain variation in survival, time-varying reproductiveinvestment had a more substantial influence.3. The dichotomy of attempting to breed or not explained variability in survival across life betterthan other parameterizations of reproductive states such as clutch size, brood size or breedingsuccess. In the kittiwake, the sinequanon condition to initiate reproduction is to hold a nest site,which is considered a very competitive activity. This might explain why attempting to breed is thekey level of investment that affects survival, independent of the outcome (failure or success).4. Interestingly, the more individuals cumulate reproductive attempts over life, the lower theirmortality risk, indicating that breeding experience may be a good indicator of parental quality aswell. In contrast, attempting to breed at time t increased the risk of mortality between t and t + 1.We thus detected an immediate trade-off between attempting to breed and survival in this population;however, the earlier individuals recruited, and the more breeding experience they accumulated,the smaller the cost.5. Lastly, unobserved heterogeneity across individuals improved model fit more (1Æ3 times) thanfixed and dynamic sources of observed heterogeneity in reproductive investment, demonstratingthat it is critical to account for both sources of individual ...