Taxon:
Cerorhinca monocerata

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Scientific Name
Cerorhinca monocerata
Common Name
rhinoceros auklet
Taxa Group
avian
Environment
marine
Move Mode
fly

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Start date: 2024 × End date: 2024 ×

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    Data package
    Data from: Study "Rhinoceros Auklet North American Pacific Coast (GLS)"
    (2024-10-18) Hipfner, J. Mark; Crossin, Glenn T.; Studholme, Katharine R.; Drever, Mark C.; Domalik, Alice D.; Cross, Cayle J.R.; Beck, Jessie N.; Bradley, Russell W.; Carle, Ryan D.; Good, Thomas P.; Hatch, Scott A.; Hodum, Peter J.; Pearson, Scott F.; Rojek, Nora A.; Slater, Leslie; Will, Alexis P.
    Models of migratory behavior predict trade-offs between fitness costs and benefits with respect to migration distance. Shorter migration distances may confer a fitness benefit by facilitating earlier breeding, however this is rarely investigated. We tested this hypothesis using a large-scale geolocation (GLS) dataset from 109 rhinoceros auklets (Cerorhinca monocerata), a differen- tially migrating seabird, that was tagged at 12 breeding colonies along the Pacific Coast of North America, spanning southern California to the eastern Aleutian Islands, Alaska. Using GLS-based position estimates, we determined the geographic centroid of the pelagic areas occupied by birds in winter (1 January–28 February) and then calculated the distance between their winter- ing centroids and colony of origin. We then used GLS light-intensity and salt-water immersion (wet/dry) data to determine each individual's date of egg-laying the following spring. Rhinoceros auklets were very widely distributed across the northeastern Pacific Ocean in winter. Among all individuals, the distance between winter centroids and breeding colonies ranged from < 100 to >2500km, being greater among individuals originating from colonies at higher latitudes. As predicted, migration distance and colony latitude were positively related to lay date: after accounting for colony-level differences in phenology, individuals that migrated shorter distances tended to lay their eggs earlier, a pattern that emerged across all populations. Our study links the migration distance of rhinoceros auklets to a fitness-related outcome, underscoring the selective pressure that migration exerts on subsequent breeding activity.