Year-round tracking reveals multiple migratory tactics in a sentinel North Pacific seabird, Cassin’s auklet
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 619:169-185 (2019) - DOI: https://doi.org/10.3354/meps12965 Year-round tracking reveals multiple migratory tactics in a sentinel North Pacific seabird, Cassin’s auklet Katharine R. Studholme1,*, J. Mark Hipfner2, Alice D. Domalik3, Sara J. Iverson1, Glenn T. Crossin1 1Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada 2Environment and Climate Change Canada, Wildlife Research Division, Delta, British Columbia V4K 3N2, Canada 3Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada *Corresponding author: krstudholme@dal.ca ABSTRACT: Nonbreeding distributions and migratory phenology can vary within and among populations of many taxa, including seabirds. Such differences can drive variation in survival and reproduction. Knowledge of where, when, and why individuals move is therefore crucial to understanding and predicting population-level processes, particularly in the context of oceanographic change. Here we present the first year-round tracking data for Cassin’s auklet Ptychoramphus aleuticus, a small, zooplanktivorous North Pacific seabird, revealing the nonbreeding behavior of birds from colonies in British Columbia, Canada, across 3 years of variable oceanographic conditions. These birds moved both north (summer, fall) and south (fall, winter) from the colony, using 1 of 4 migratory tactics: North, South, North-South, or Local. Distributions ranged from the Aleutian Islands to Baja California, to maximum distances of 2757 and 3110 km, respectively. Within tactics there was additional spatiotemporal variation among individuals, resulting in diverse nonbreeding experiences. Some variability was explained by year and sex. Cassin’s auklets appear to target distinct, ecologically differentiated areas within their nonbreeding range which may have good quality habitat. Variation in these target regions across years suggests somewhat flexible migratory behavior; however, consistent migration to the Southern California Bight despite very low productivity in one study year suggests that fixed tactics may exist. This work contributes to our understanding of predator movement in the North Pacific and highlights the importance of individual-level spatial data for studies of carryover effects and conservation planning. KEY WORDS: Ptychoramphus aleuticus · Nonbreeding distribution · Migratory strategy · Partial migration · Individual variability · Geolocator · Alcidae · Marine heatwave · ‘The Blob’ · Mortality event Full text in pdf format Supplementary material PreviousNextCite this article as: Studholme KR, Hipfner JM, Domalik AD, Iverson SJ, Crossin GT (2019) Year-round tracking reveals multiple migratory tactics in a sentinel North Pacific seabird, Cassin’s auklet. Mar Ecol Prog Ser 619:169-185. https://doi.org/10.3354/meps12965 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 619. Online publication date: June 04, 2019 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2019 Inter-Research.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".