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June 6, 2026Marine Mammal Science

Year‐Round Haulout Activity of Harbor and Gray Seals Derived From Satellite Telemetry in Scandinavian Waters

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Authors

AGAnders GalatiusJTJonas TeilmannEREsteban Iglesias Rivas

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Overview

Randomized trial examines seal haulout behavior, revealing significant patterns in Scandinavian waters, suggesting improved abundance estimates.

Key Points

  • The study aims to analyze year-round haulout behavior of harbor and gray seals and estimate correction factors for abundance estimations.
  • Tagged 100 seals (66 harbor and 34 gray) with satellite transmitters in Kattegat and the western Baltic Sea between 2004 and 2017.
  • Assessed diel haulout patterns and calculated haulout probabilities across different seasons and age classes.
  • Harbor seals showed highest haulout probability at night year-round, except during mating season.
  • Western Baltic harbor seals preferred daytime haulouts, peaking in March–May, with lowest probabilities in December–February.
  • Baltic gray seals predominantly hauled out at night, with juveniles peaking in March–April and pups peaking during molt in May–June.

Cite This Study

Galatius et al. (2026) studied this question.

synapsesocial.com/papers/6a23ba3c71a5da9775e76076https://doi.org/10.1111/mms.70208
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Nocturnal Haul‐Out Behavior of Rehabilitated Gray Seal Juveniles ( <i>Halichoerus grypus</i> ) in the Baltic Sea2026
  2. 2Haul‐Out Site Use and Connectivity of Harbour Seals Between Management Units in Southern Scandinavia2026
  3. 3Changing Reproductive Dynamics in Harbour Seals of the North and Baltic Seas2026
  4. 4Seasonal calling and acoustic masking in gray ( <i>Halichoerus grypus</i> ) and harbor ( <i>Phoca vitulina</i> ) seals in the Northwest Atlantic2025
  5. 5Ringed Seal ( <i>Pusa hispida</i> ) Haul‐Out Behavior and Emergence Timing in the Bering, Chukchi, and Beaufort Seas2026