Journal
BIOLOGY LETTERS
Volume 15, Issue 10, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsbl.2019.0634
Keywords
guillemots; murres; pre-laying period; timing of egg-laying; Uria aalge; Uria lomvia
Categories
Funding
- Norwegian Ministry for Climate and the Environment
- Norwegian Ministry of Foreign Affairs
- Norwegian Oil and Gas Association through the SEATRACK project
- Research Council of Norway [216547]
- TOTAL EP Norway
- TOTAL Foundation
- UK Natural Environment Research Council
- NERC [NE/L003082/1] Funding Source: UKRI
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A global analysis recently showed that seabird breeding phenology (as the timing of egg-laying and hatching) does not, on average, respond to temperature changes or advance with time (Keogan et al. 2018 Nat. Clim. Change 8, 313-318). This group, the most threatened of all birds, is therefore prone to spatio-temporal mismatches with their food resources. Yet, other aspects of the breeding phenology may also have a marked influence on breeding success, such as the arrival date of adults at the breeding site following winter migration. Here, we used a large tracking dataset of two congeneric seabirds breeding in 14 colonies across 18 degrees latitudes, to show that arrival date at the colony was highly variable between colonies and species (ranging 80 days) and advanced 1.4 days/year while timing of egg-laying remained unchanged, resulting in an increasing pre-laying duration between 2009 and 2018. Thus, we demonstrate that potentially not all components of seabird breeding phenology are insensitive to changing environmental conditions.
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