Survival estimates for the greater crested tern Thalasseus bergii in southern Africa

A. Payo-Payo*, A. Sanz-Aguilar, D. Gaglio, R. B. Sherley, T. R. Cook, R. Altwegg, P. G. Ryan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The nominate race of the greater crested tern Thalasseus bergii breeds only along the coast of the Benguela region (west coast) of southern Africa, where its population is increasing, in contrast to other species of breeding seabirds in the region which similarly depend on forage fish. Although this population’s trends are well known, its demographic parameters remain obscure. We used multi-event capture–recapture–recovery modelling to provide the first estimates of survival. The survival rate of birds older than two years was 0.93 (0.91–0.95); second-year survival was 0.93 (0.90–0.95) and first-year survival was 0.80 (0.73–0.85). A resighting of a 34-year-old bird is a new longevity record for the species. Population growth rates projected with a Leslie matrix model that included our survival estimates were very similar to estimates from annual counts of the breeding population (7–8% y−1), suggesting that these survival estimates adequately describe the species’ demography. High survival rates have likely contributed to the species’ recent population increase in the region.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalAfrican Journal of Marine Science
Volume40
Issue number1
Early online date29 Mar 2018
DOIs
Publication statusPublished - 2018

Keywords

  • capture–recapture method
  • demography
  • Leslie matrix
  • longevity
  • population dynamics
  • recovery model
  • seabirds
  • swift tern

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