scholarly journals Population assignment reveals low migratory connectivity in a weakly structured songbird

2019 ◽  
Vol 28 (9) ◽  
pp. 2122-2135 ◽  
Author(s):  
Matthew G. DeSaix ◽  
Lesley P. Bulluck ◽  
Andrew J. Eckert ◽  
Catherine B. Viverette ◽  
Than J. Boves ◽  
...  
Keyword(s):  
Migratory Connectivity ◽  
Population Assignment

Integrating tracking and resight data enables unbiased inferences about migratory connectivity and winter range survival from archival tags

The Condor ◽  
2021 ◽  
Author(s):  
Clark S Rushing ◽  
Aimee M Van Tatenhove ◽  
Andrew Sharp ◽  
Viviana Ruiz-Gutierrez ◽  
Mary C Freeman ◽  
...  
Keyword(s):  
Transition Probabilities ◽  
Eastern United States ◽  
Migratory Connectivity ◽  
Migratory Species ◽  
Pet Trade ◽  
Winter Range ◽  
Archival Tags ◽  
Breeding Grounds ◽  
Unbiased Estimates ◽  
Further Development

Abstract Archival geolocators have transformed the study of small, migratory organisms but analysis of data from these devices requires bias correction because tags are only recovered from individuals that survive and are re-captured at their tagging location. We show that integrating geolocator recovery data and mark–resight data enables unbiased estimates of both migratory connectivity between breeding and nonbreeding populations and region-specific survival probabilities for wintering locations. Using simulations, we first demonstrate that an integrated Bayesian model returns unbiased estimates of transition probabilities between seasonal ranges. We also used simulations to determine how different sampling designs influence the estimability of transition probabilities. We then parameterized the model with tracking data and mark–resight data from declining Painted Bunting (Passerina ciris) populations breeding in the eastern United States, hypothesized to be threatened by the illegal pet trade in parts of their Caribbean, nonbreeding range. Consistent with this hypothesis, we found that male buntings wintering in Cuba were 20% less likely to return to the breeding grounds than birds wintering elsewhere in their range. Improving inferences from archival tags through proper data collection and further development of integrated models will advance our understanding of the full annual cycle ecology of migratory species.

scholarly journals Elevational niche-shift migration: Why the degree of elevational change matters for the ecology, evolution, and physiology of migratory birds

The Auk ◽  
2021 ◽  
Author(s):  
Jessie L Williamson ◽  
Christopher C Witt
Keyword(s):  
Partial Pressure ◽  
Bird Species ◽  
Seasonal Migration ◽  
Critical Examination ◽  
Niche Shift ◽  
Migratory Connectivity ◽  
Migratory Species ◽  
Arterial Blood ◽  
Air Density ◽  
Elevational Migration

Abstract Elevational migration can be defined as roundtrip seasonal movement that involves upward and downward shifts in elevation. These shifts incur physiological challenges that are proportional to the degree of elevational change. Larger shifts in elevation correspond to larger shifts in partial pressure of oxygen, air density, temperature, and ultraviolet (UV) exposure. Although most avian examples of elevational migration involve subtle shifts that would have minimal impacts on physiology, shifts of any magnitude have previously been considered under the broad umbrella of “elevational migration”. Here, we consider extreme seasonal elevational movements (≥2,000 m), sufficient to shift the elevational dimension of the eco-climatic niche. Migratory bird populations typically maintain inter-seasonal stability in the temperature, precipitation, and elevational aspects of their climatic niches, a tendency that likely reflects genetic physiological specialization on environmental conditions such as atmospheric pressure. A shift of ≥2,000 m involves a ≥20% change in air density and oxygen partial pressure, sufficient to incur functionally impactful declines in arterial blood-oxygen saturation and require compensatory shifts in respiratory physiology. We refer to this phenomenon as elevational niche-shift migration (ENSM). In this review, we analyzed >4 million occurrence records to identify 105 populations, representing 92 bird species, that undergo complete or partial ENSM. We identified key ecological and evolutionary questions regarding the causes and consequences of ENSM. Our synthesis reveals that ENSM has evolved independently in at least 29 avian families spanning 10 orders. Nonetheless, ENSM is rare relative to other forms of seasonal migration, consistent with the general tendency of seasonal niche conservatism by migratory species and evolutionarily conserved elevational range limits. For many migratory species and populations, within-species patterns of migratory connectivity are not sufficiently understood to determine ENSM status. ENSM is distinguished by its scale within the broader phenomenon of elevational migration. Critical examination of ENSM illustrates fundamental constraints on the ecology and evolution of migration systems, topographical influences on geographic patterns of migratory connectivity, and the remarkable metabolic flexibility of certain bird species that allows them to occupy disparate elevations across different seasons.

scholarly journals Migratory connectivity and effects of winter temperatures on migratory behaviour of the European robinErithacus rubecula: a continent‐wide analysis

2016 ◽  
Vol 85 (3) ◽  
pp. 749-760 ◽  
Author(s):  
Roberto Ambrosini ◽  
José Javier Cuervo ◽  
Chris Feu ◽  
Wolfgang Fiedler ◽  
Federica Musitelli ◽  
...  
Keyword(s):  
Migratory Behaviour ◽  
Migratory Connectivity ◽  
Winter Temperatures

Impacts of extreme environmental disturbances on piping plover survival are partially moderated by migratory connectivity

2021 ◽  
Vol 264 ◽  
pp. 109371
Author(s):  
Kristen S. Ellis ◽  
Michael J. Anteau ◽  
Francesca J. Cuthbert ◽  
Cheri L. Gratto-Trevor ◽  
Joel G. Jorgensen ◽  
...  
Keyword(s):  
Piping Plover ◽  
Migratory Connectivity ◽  
Environmental Disturbances

Seasonal Movements, Winter Range Use, and Migratory Connectivity of the Black Oystercatcher

The Condor ◽  
2010 ◽  
Vol 112 (4) ◽  
pp. 731-743 ◽  
Author(s):  
Matthew Johnson ◽  
Peter Clarkson ◽  
Michael I. Goldstein ◽  
Susan M. Haig ◽  
Richard B. Lanctot ◽  
...  
Keyword(s):  
Migratory Connectivity ◽  
Seasonal Movements ◽  
Range Use ◽  
Winter Range

Intercontinental Migratory Connectivity and Population Structuring of Dunlins from Western Alaska

The Condor ◽  
2013 ◽  
Vol 115 (3) ◽  
pp. 525-534 ◽  
Author(s):  
Robert E. Gill ◽  
Colleen M. Handel ◽  
Daniel R. Ruthrauff
Keyword(s):  
Migratory Connectivity ◽  
Population Structuring

Migratory connectivity derived from sparse ring reencounter data with unknown numbers of ringed birds

2011 ◽  
Vol 153 (3) ◽  
pp. 771-782 ◽  
Author(s):  
Fränzi Korner-Nievergelt ◽  
Felix Liechti ◽  
Steffen Hahn
Keyword(s):  
Migratory Connectivity
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