Data from: Sex-specific patterns of reproductive senescence in a long-lived reintroduced raptor

1) For many species there is evidence that breeding performance changes as an individual ages. In iteroparous species, breeding performance often increases through early-life and is expected to level out or even decline (senesce) later in life. Furthermore, an individual's sex and conditions experienced in early-life can affect breeding performance and how this changes with age. 2) Long-term monitoring of individuals from reintroduced populations can provide unique opportunities to explore age-related trends in breeding performance that might otherwise be logistically challenging. 3) We used a unique dataset from a reintroduced population of white-tailed eagles Haliaeetus albicilla in Scotland, which has been intensively monitored since their initial reintroduction in 1975, to study age- and sex-specific trends in two measures of breeding performance. This monitoring provided data on breeding performance of known individuals ranging in age from 3 to 26 years old. We also explored changes in breeding performance in relation to early-life experience (i.e. whether they were released or fledged in the wild). 4) Breeding performance increased with age in early-life in a similar manner for both sexes. We found stronger evidence for senescence in breeding performance in males than females. However, late-life female breeding success was associated with early-life experience, while male senescent trends were not apparently impacted by conditions experienced during early-life. 5) Sexual differences in senescence mean that older males are less likely to breed successfully compared to older females and this may influence females' mate changes later in life. This difference may suggest a linked sexual difference in survival rates or the possibility of proactive partner change by females in later life in this typically monogamous bi-parental species.white_tailed_eagle_femaleThis dataset includes all breeding attempts by known age female white-tailed eagles between 3 – 26 years old and the associated information of the partner if known. FemaleID = individual code for female identity MaleID = individual code for male identity OriginF = Origin of female OriginM = Origin of male (if known) Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Territory = individual code for breeding territory Year = year of breeding attempt FAge = The age of the female Mage = The age of the male (if known) Fexp = The number of breeding year / experience of the female Mexp = The number of breeding year / experience of the male (if known) Success = 0/1 if any chicks were fledged or not Fledged = 0/1/2 the number of chicks fledgedwhite_tailed_eagle_maleThis dataset includes all breeding attempts by known age male white-tailed eagles between 3 – 26 years old and the associated information of the partner if known. MaleID = individual code for male identity FemaleID = individual code for female identity OriginF = Origin of female (if known) OriginM = Origin of male Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Territory = individual code for breeding territory Year = year of breeding attempt FAge = The age of the female (if known) Mage = The age of the male Fexp = The number of breeding year / experience of the female (if known) Mexp = The number of breeding year / experience of the male Success = 0/1 if any chicks were fledged or not Fledged = 0/1/2 the number of chicks fledgedyoung_successThis data set includes data from female white-tailed eagles aged 3 – 15 and male white-tailed eagles aged 3 – 18 years to examine breeding success. ID = Individual identity Territory = individual code for breeding territory Year = year of breeding attempt Origin = Origin of individual Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Sex = Male / Female First_age = age at individuals first breeding attempt Age = age at breeding attempt Success = 0/1 if any chicks were fledged or notyoung_productivityThis data set includes data from female white-tailed eagles aged 3 – 13 and male white-tailed eagles aged 3 – 18 years to examine breeding productivty. ID = Individual identity Territory = individual code for breeding territory Year = year of breeding attempt Origin = Origin of individual Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Sex = Male / Female First_age = age at individuals first breeding attempt Age = age at breeding attempt Fledged = 0/1/2 the number of chicks fledgedold_successThis data set includes data from female white-tailed eagles aged 16 – 23 and male white-tailed eagles aged 19 – 23 years to examine breeding success. ID = Individual identity Territory = individual code for breeding territory Year = year of breeding attempt Origin = Origin of individual Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Sex = Male / Female Last_age = age at individuals last breeding attempt NB. Many were still alive and breeding while monitoring was on going. Therefore year of last recorded breeding attempt also given (Last_year). Age = age at breeding attempt Success = 0/1 if any chicks were fledged or notold_productivityThis data set includes data from female white-tailed eagles aged 14 – 23 and male white-tailed eagles aged 19 – 23 years to examine breeding productivity. ID = Individual identity Territory = individual code for breeding territory Year = year of breeding attempt Origin = Origin of individual Origin categories: R1 = release phase 1, R2 = release phase 2, W= wild bred Sex = Male / Female Last_age = age at individuals last breeding attempt NB. Many were still alive and breeding while monitoring was on going. Therefore year of last recorded breeding attempt also given (Last_year). Age = age at breeding attempt Fledged = 0/1/2 the number of chicks fledgedReadM