Hypotheses and tracking results about the longest migration: The case of the arctic tern

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Hypotheses and tracking results about the longest migration : The case of the arctic tern. / Alerstam, Thomas; Bäckman, Johan; Grönroos, Johanna; Olofsson, Patrik; Strandberg, Roine.

I: Ecology and Evolution, Vol. 9, Nr. 17, 09.2019, s. 9511-9531.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Alerstam, Thomas ; Bäckman, Johan ; Grönroos, Johanna ; Olofsson, Patrik ; Strandberg, Roine. / Hypotheses and tracking results about the longest migration : The case of the arctic tern. I: Ecology and Evolution. 2019 ; Vol. 9, Nr. 17. s. 9511-9531.

RIS

TY - JOUR

T1 - Hypotheses and tracking results about the longest migration

T2 - The case of the arctic tern

AU - Alerstam, Thomas

AU - Bäckman, Johan

AU - Grönroos, Johanna

AU - Olofsson, Patrik

AU - Strandberg, Roine

PY - 2019/9

Y1 - 2019/9

N2 - The arctic tern Sterna paradisaea completes the longest known annual return migration on Earth, traveling between breeding sites in the northern arctic and temperate regions and survival/molt areas in the Antarctic pack-ice zone. Salomonsen (1967, Biologiske Meddelelser, Copenhagen Danske Videnskabernes Selskab, 24, 1) put forward a hypothetical comprehensive interpretation of this global migration pattern, suggesting food distribution, wind patterns, sea ice distribution, and molt habits as key ecological and evolutionary determinants. We used light-level geolocators to record 12 annual journeys by eight individuals of arctic terns breeding in the Baltic Sea. Migration cycles were evaluated in light of Salomonsen's hypotheses and compared with results from geolocator studies of arctic tern populations from Greenland, Netherlands, and Alaska. The Baltic terns completed a 50,000 km annual migration circuit, exploiting ocean regions of high productivity in the North Atlantic, Benguela Current, and the Indian Ocean between southern Africa and Australia (sometimes including the Tasman Sea). They arrived about 1 November in the Antarctic zone at far easterly longitudes (in one case even at the Ross Sea) subsequently moving westward across 120–220 degrees of longitude toward the Weddell Sea region. They departed from here in mid-March on a fast spring migration up the Atlantic Ocean. The geolocator data revealed unexpected segregation in time and space between tern populations in the same flyway. Terns from the Baltic and Netherlands traveled earlier and to significantly more easterly longitudes in the Indian Ocean and Antarctic zone than terns from Greenland. We suggest an adaptive explanation for this pattern. The global migration system of the arctic tern offers an extraordinary possibility to understand adaptive values and constraints in complex pelagic life cycles, as determined by environmental conditions (marine productivity, wind patterns, low-pressure trajectories, pack-ice distribution), inherent factors (flight performance, molt, flocking), and effects of predation/piracy and competition.

AB - The arctic tern Sterna paradisaea completes the longest known annual return migration on Earth, traveling between breeding sites in the northern arctic and temperate regions and survival/molt areas in the Antarctic pack-ice zone. Salomonsen (1967, Biologiske Meddelelser, Copenhagen Danske Videnskabernes Selskab, 24, 1) put forward a hypothetical comprehensive interpretation of this global migration pattern, suggesting food distribution, wind patterns, sea ice distribution, and molt habits as key ecological and evolutionary determinants. We used light-level geolocators to record 12 annual journeys by eight individuals of arctic terns breeding in the Baltic Sea. Migration cycles were evaluated in light of Salomonsen's hypotheses and compared with results from geolocator studies of arctic tern populations from Greenland, Netherlands, and Alaska. The Baltic terns completed a 50,000 km annual migration circuit, exploiting ocean regions of high productivity in the North Atlantic, Benguela Current, and the Indian Ocean between southern Africa and Australia (sometimes including the Tasman Sea). They arrived about 1 November in the Antarctic zone at far easterly longitudes (in one case even at the Ross Sea) subsequently moving westward across 120–220 degrees of longitude toward the Weddell Sea region. They departed from here in mid-March on a fast spring migration up the Atlantic Ocean. The geolocator data revealed unexpected segregation in time and space between tern populations in the same flyway. Terns from the Baltic and Netherlands traveled earlier and to significantly more easterly longitudes in the Indian Ocean and Antarctic zone than terns from Greenland. We suggest an adaptive explanation for this pattern. The global migration system of the arctic tern offers an extraordinary possibility to understand adaptive values and constraints in complex pelagic life cycles, as determined by environmental conditions (marine productivity, wind patterns, low-pressure trajectories, pack-ice distribution), inherent factors (flight performance, molt, flocking), and effects of predation/piracy and competition.

KW - Antarctica

KW - arctic tern

KW - bird migration

KW - global migration

KW - population segregation

UR - http://www.scopus.com/inward/record.url?scp=85070076698&partnerID=8YFLogxK

U2 - 10.1002/ece3.5459

DO - 10.1002/ece3.5459

M3 - Article

VL - 9

SP - 9511

EP - 9531

JO - Ecology and Evolution

JF - Ecology and Evolution

SN - 2045-7758

IS - 17

ER -