Hemispheric-scale wind selection facilitates bar-tailed godwit circum-migration of the Pacific

Gill, Robert E.; Douglas, David C.; Handel, Colleen M.; Tibbitts, T. Lee; Hufford, Gary L.; Piersma, Theunis

doi:10.1016/j.anbehav.2014.01.020

Cited by 87 publications

(104 citation statements)

References 94 publications

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“…5). We acknowledge that other weather conditions such as wind direction and atmospheric pressure systems can influence timing of avian migration (Yamaguchi et al 2012b;Gill et al 2014). We were unable to assess long-term changes in those conditions, and assume they did not differentially affect ringed and radiomarked pintails.…”

Section: Discussionmentioning

confidence: 99%

Evidence that dorsally mounted satellite transmitters affect migration chronology of Northern Pintails

Hupp

Kharitonov²,

Yamaguchi

et al. 2015

J Ornithol

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We compared migration movements and chronology between Northern Pintails (Anas acuta) marked with dorsally mounted satellite transmitters and pintails marked only with tarsus rings. During weekly intervals of spring and autumn migration between their wintering area in Japan and nesting areas in Russia, the mean distance that ringed pintails had migrated was up to 1000 km farther than the mean distance radiomarked pintails migrated. Radiomarked pintails were detected at spring migration sites on average 9.9 days (90 % CI 8.0, 11.8) later than ringed pintails that were recovered within 50 km. Although ringed and radiomarked pintails departed from Japan on similar dates, the disparity in detection of radiomarked versus ringed pintails at shared sites increased 7.7 days (90 % CI 5.2, 10.2) for each 1000 km increase in distance from Japan. Thus, pintails marked with satellite transmitters arrived at nesting areas that were 2500 km from Japan on average 19 days later than ringed birds. Radiomarked pintails were detected at autumn migration stopovers on average 13.1 days (90 % CI 9.8, 16.4) later than ringed birds that were recovered within 50 km. We hypothesize that dorsal attachment of 12-20 g satellite transmitters to Northern Pintails increased the energetic cost of flight, which resulted in more rapid depletion of energetic reserves and shortened the distance pintails could fly without refueling. Radiomarked pintails may have used more stopovers or spent longer periods at stopovers. causing their migration schedule to diverge from ringed pintails. We urge further evaluation of the effects of dorsally mounted transmitters on migration chronology of waterfowl.

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Section: Discussionmentioning

confidence: 99%

Evidence that dorsally mounted satellite transmitters affect migration chronology of Northern Pintails

Hupp

Kharitonov²,

Yamaguchi

et al. 2015

J Ornithol

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“…Evidence of looped migration strategies has been documented with terrestrial bird species, including a large number that migrate within the Western Hemisphere [23]. Seasonal variation in atmospheric conditions [19,24] and seasonal changes in ecological productivity [25] have been identified as likely drivers for these strategies. For species that conduct transoceanic migration within the Western Hemisphere, a migration flyway has been identified within the eastern portion of North America [24].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, associating with favourable atmospheric conditions, specifically supportive winds, is considered essential for successful transoceanic crossings [18][19][20]. We would therefore expect that, for species using the same transoceanic flyway, the more stringent selection pressures should result in the broad-scale convergence of migration strategies towards the most optimal solution.…”

Section: Introductionmentioning

confidence: 99%

Convergence of broad-scale migration strategies in terrestrial birds

Sorte¹,

Fink²,

Hochachka³

et al. 2016

Proc. R. Soc. B.

107

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Migration is a common strategy used by birds that breed in seasonal environments. Selection for greater migration efficiency is likely to be stronger for terrestrial species whose migration strategies require non-stop transoceanic crossings. If multiple species use the same transoceanic flyway, then we expect the migration strategies of these species to converge geographically towards the most optimal solution. We test this by examining population-level migration trajectories within the Western Hemisphere for 118 migratory species using occurrence information from eBird. Geographical convergence of migration strategies was evident within specific terrestrial regions where geomorphological features such as mountains or isthmuses constrained overland migration. Convergence was also evident for transoceanic migrants that crossed the Gulf of Mexico or Atlantic Ocean. Here, annual population-level movements were characterized by clockwise looped trajectories, which resulted in faster but more circuitous journeys in the spring and more direct journeys in the autumn. These findings suggest that the unique constraints and requirements associated with transoceanic migration have promoted the spatial convergence of migration strategies. The combination of seasonal atmospheric and environmental conditions that has facilitated the use of similar broad-scale migration strategies may be especially prone to disruption under climate and land-use change.

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“…In the event that these sites are no longer available and birds have to stage along whatever remains of the Jiangsu coast this would potentially add some 500-650 km (great-circle distance) to their flight to the breeding grounds, although it is known that Bar-tailed Godwits do not follow a great-circle route but a longer one across the Bering Strait (Gill et al 2014). This would equate to an increase in flight distance of~12.5% for Bar-tailed Godwits (race baueri) and 11.7% for Red Knots (race piersmai).…”

Section: A Future For Shorebirds On China's Yellow Sea Coast?mentioning

confidence: 99%

Shorebirds along the Yellow Sea coast of China face an uncertain future—a review of threats

Melville

Chen

2016

Emu - Austral Ornithology

108

107

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Abstract. Wetlands along the Yellow Sea coast of China, which are a major staging area for shorebirds in the East Asian-Australasian Flyway, are in a state of crisis that threatens the future of this migration system. Populations of many shorebirds in the Flyway have declined in recent decades at a time when there has been widespread loss of habitat and degradation of coastal wetlands around the Yellow Sea. Here we examine current threats to coastal wetlands along China's Yellow Sea coast based on field surveys in 2013 and 2014 and a review of the literature. Intertidal habitats have been lost to land claim or degraded through aquaculture and harvesting, as well as gross pollution and invasion of exotic Spartina, all of which have negatively affected shorebird foraging, roosting and breeding sites. Planned further development, if unchecked, will result in the loss of most of the remaining intertidal area, which is likely to result in calamitous declines in populations of many shorebirds. There is a need for immediate action to curb future land claim and to develop an integrated coastal management strategy. Further research on applied aspects of shorebird ecology is urgently needed to inform future policy development and decision making.

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Hemispheric-scale wind selection facilitates bar-tailed godwit circum-migration of the Pacific

Cited by 87 publications

References 94 publications

Evidence that dorsally mounted satellite transmitters affect migration chronology of Northern Pintails

Evidence that dorsally mounted satellite transmitters affect migration chronology of Northern Pintails

Convergence of broad-scale migration strategies in terrestrial birds

Shorebirds along the Yellow Sea coast of China face an uncertain future—a review of threats

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