Population-specific home ranges and migration timing of Pacific Arctic beluga whales (Delphinapterus leucas)

Two populations of beluga whales ( Delphinapterus leucas ), the Eastern Beaufort Sea (BS) and Eastern Chukchi Sea (ECS), make extensive seasonal migrations into the Pacific Arctic. However, the extent to which these populations overlap in time and space is not known. We quantified distribution and m...

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Bibliographic Details
Published in:Polar biology 2014-08, Vol.37 (8), p.1171-1183
Main Authors: Hauser, Donna D. W., Laidre, Kristin L., Suydam, Robert S., Richard, Pierre R.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal migration
Animal populations
Animal, plant and microbial ecology
Biological and medical sciences
Biomedical and Life Sciences
Cetacea
Communications equipment
Delphinapterus leucas
Ecology
Fundamental and applied biological sciences. Psychology
Life Sciences
Mammalia
Marine
Microbiology
Oceanography
Original Paper
Particular ecosystems
Plant Sciences
Sea water ecosystems
Synecology
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
Whales & whaling
Zoology
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Summary:Two populations of beluga whales ( Delphinapterus leucas ), the Eastern Beaufort Sea (BS) and Eastern Chukchi Sea (ECS), make extensive seasonal migrations into the Pacific Arctic. However, the extent to which these populations overlap in time and space is not known. We quantified distribution and migration patterns for BS and ECS belugas using daily locations from whales tracked with satellite-linked transmitters. Home ranges and core areas in summer (July and August) and in each month (July–November), daily displacement, dispersal from core areas, and autumn migration timing were estimated. Distinct summer and fall distribution patterns and staggered autumn migration timing were identified for BS and ECS whales. Summer home ranges for each population had less than 10 % overlap. Monthly home ranges were also relatively distinct between populations except in September (up to 88 % home range overlap). A distinct east–west shift in focal area use occurred in September that persisted into October, with the two populations essentially switching longitudinal positions. Highest daily displacements occurred during the migratory period in September for BS whales and October for ECS whales, further indicating westward fall migration was offset between populations. Sexual segregation of males and females within a population also varied monthly. Autumn migration timing as well as differences in spatial and temporal segregation between BS and ECS beluga populations may be a result of maternally driven philopatry and population-specific adaptations to dynamically available resources. Our results contribute to the management of these populations by identifying seasonal area use and differences in migration patterns.
ISSN:0722-4060
1432-2056
DOI:10.1007/s00300-014-1510-1