Population ecology Earlier colony arrival but no trend in hatching timing in two congeneric seabirds (Uria spp.) across the North Atlantic

• Published in: Biology Letters
• Main Authors: Merkel, Benjamin, Descamps, Sébastien, Yoccoz, Nigel, Danielsen, Jóhannis, Daunt, Francis, Erikstad, Kjell, Ezhov, Aleksey, Grémillet, David, Gavrilo, Maria, Lorentsen, Svein-Håkon, Reiertsen, Tone, Steen, Harald, Systad, Geir, Lindberg Þórarinsson, Þorkell, Wanless, Sarah, Strøm, Hallvard
• Other Authors: Département Ecologie, Physiologie et Ethologie (DEPE-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre for Ecology and Hydrology Edinburgh (CEH), Natural Environment Research Council (NERC), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD France-Sud )
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: Subject Areas: behaviour; ecology Keywords: guillemots; murres; pre-laying period; timing of egg-laying; Uria aalge; Uria lomvia; [SDE]Environmental Sciences; North Atlantic; uria
• Online Access: https://hal.archives-ouvertes.fr/hal-02328876; https://hal.archives-ouvertes.fr/hal-02328876/document; https://hal.archives-ouvertes.fr/hal-02328876/file/Merkel%20et%20al.%202019.pdf; https://doi.org/10.1098/rsbl.2019.0634

International audience 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°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.