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25 April 2018 Are seabirds' life history traits maladaptive under present oceanographic variability? The case of Heermann's Gull (Larus heermanni)
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Abstract

Ocean warming events are becoming more frequent, with potential consequences for birds that use marine resources. We analyzed the annual population growth of Heermann's Gulls (Larus heermanni) through matrix-based demographic models under normal and high sea surface temperature (SST) conditions. Under stable, normal conditions, predicted population growth was ∼4%, with survival of fledglings and juveniles contributing to population growth. Under high SST conditions, predicted population growth dropped to −15% and adult survival became the key factor determining species fitness. Simulations showed a declining growth rate as the frequency of warm SST anomalies increased. Heermann's Gulls can resist oceanographic anomalies of up to 1 event every 5 yr without seriously compromising their population growth rate or their individual fitness, but populations may decline rapidly if the frequency of warm-phase anomalies continues to increase, as it has done during the last decade.

© 2018 American Ornithological Society.
Enriqueta Velarde and Exequiel Ezcurra "Are seabirds' life history traits maladaptive under present oceanographic variability? The case of Heermann's Gull (Larus heermanni)," The Condor 120(2), 388-401, (25 April 2018). https://doi.org/10.1650/CONDOR-17-5.1
Received: 9 January 2017; Accepted: 30 January 2018; Published: 25 April 2018
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