Breeding seabirds increase foraging range in response to an extreme marine heatwave

• Main Authors: 3rd World Seabird Conference 2021, Osborne, Orla
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Underline Science Inc. 2021
• Subjects: Climate Change; Ecosystem; Animal Science; Animal Biology; Canada; Elliott; Kyle; Osborne; Pacific; Black-legged Kittiwake; rissa tridactyla
• Online Access: https://dx.doi.org/10.48448/efqw-ks54; https://underline.io/lecture/34578-breeding-seabirds-increase-foraging-range-in-response-to-an-extreme-marine-heatwave

Abstract: Marine heatwaves are increasing in frequency and can disrupt marine ecosystems non-linearly. In this study we examined the effect of the North Pacific warming event of 2014, the largest long-term sea surface anomaly on record, on black-legged kittiwake (Rissa tridactyla) foraging trips before, during, and after the event. We assessed foraging trip characteristics (trip distance and duration), the dispersal of foraging locations, and the persistence of foraging areas within and among years. Foraging trip characteristics, foraging area size, and location varied from year to year. Kittiwakes foraging was more dispersed, direct, and farther from the colony in years immediately after and during the warming event. A third of the foraging area used pre-heat wave (2012) was important in subsequent years, which indicates that this area was, and may still be, a perennial foraging hot spot. During the chick-rearing stage black-legged kittiwakes increased their speed and reduced the proportion of resting compared to the incubation stage. We conclude that marine heat waves may have a strong impact on seabird foraging, extending foraging ranges, and that those impacts may be nonlinear with a strong lag. Authors: Orla Osborne¹, Patrick O'Hara², Kyle Elliott³, Paul Zandbergen¹, Scott Hatch⁴, Shannon Whelan³ ¹Vancouver Island University, ²Environment and Climate Change Canada - University of Victoria, ³McGIll University, ⁴Institute for Seabird Research and Conservation