Using stable isotopes to estimate reliance on agricultural food subsidies and migration timing for a migratory bird

The migration patterns of marine fishes are poorly known, in part owing to the technical limitations associated with tracking the movements of animals in deep water. Here we document a large-scale, directed, migration of Atlantic cod (Gadus morhua) off eastern Canada. Our approach was based on the acoustic tagging of 126 fish and the deployment of 69 subsurface receivers, stretching over a 160-km distance along the edge of the Laurentian Channel. After 1 year of automated recording, we found that 65% of the fish migrated out of coastal waters in two distinct runs during the summerautumn period. The offshore-migrating fish overwintered in deep Laurentian Channel waters, returning inshore in April. Individual migration routes and migration timing were variable, indicating that the cod did not aggregate in large schools during the seasonal migration events.

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Niche dynamics of shorebirds in Delaware Bay: Foraging behavior, habitat choice and migration timing

Acta Oecologica ◽

10.1016/j.actao.2016.07.002 ◽

2016 ◽

Vol 75 ◽

pp. 68-76 ◽

Cited By ~ 7

Author(s):

Ivana Novcic

Keyword(s):

Foraging Behavior ◽

Habitat Choice ◽

Delaware Bay ◽

Migration Timing ◽

Niche Dynamics ◽

And Migration

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STABLE ISOTOPE EVIDENCE LINKS BREEDING GEOGRAPHY AND MIGRATION TIMING IN WOOD WARBLERS (PARULIDAE)

The Auk ◽

10.1642/0004-8038(2006)123[431:sielbg]2.0.co;2 ◽

2006 ◽

Vol 123 (2) ◽

pp. 431 ◽

Cited By ~ 20

Author(s):

Jeffrey F. Kelly

Keyword(s):

Stable Isotope ◽

Migration Timing ◽

Wood Warblers ◽

Isotope Evidence ◽

And Migration

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Functional gene diversity and migration timing in reintroduced Chinook salmon

Conservation Genetics ◽

10.1007/s10592-015-0753-x ◽

2015 ◽

Vol 16 (6) ◽

pp. 1455-1464 ◽

Cited By ~ 1

Author(s):

Melissa L. Evans ◽

Samuel J. Shry ◽

Dave P. Jacobson ◽

Nicholas M. Sard ◽

Kathleen G. O’Malley

Keyword(s):

Chinook Salmon ◽

Gene Diversity ◽

Functional Gene ◽

Migration Timing ◽

Functional Gene Diversity ◽

And Migration

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Effects of subsidies from spawning chum and pink salmon on juvenile coho salmon body size and migration timing

Ecosphere ◽

10.1890/es14-00162.1 ◽

2015 ◽

Vol 6 (10) ◽

pp. art209-art209 ◽

Cited By ~ 8

Author(s):

Michelle C. Nelson ◽

John D. Reynolds

Keyword(s):

Body Size ◽

Coho Salmon ◽

Pink Salmon ◽

Migration Timing ◽

And Migration

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Turnover rates of stable isotopes in avian blood and toenails: Implications for dietary and migration studies

Journal of Experimental Marine Biology and Ecology ◽

10.1016/j.jembe.2015.07.006 ◽

2015 ◽

Vol 472 ◽

pp. 89-96 ◽

Cited By ~ 13

Author(s):

Pedro M. Lourenço ◽

José P. Granadeiro ◽

João L. Guilherme ◽

Teresa Catry

Keyword(s):

Stable Isotopes ◽

Turnover Rates ◽

Migration Studies ◽

Avian Blood ◽

And Migration

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A full annual perspective on sex-biased migration timing in long-distance migratory birds

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2018.2821 ◽

2019 ◽

Vol 286 (1897) ◽

pp. 20182821 ◽

Cited By ~ 12

Author(s):

Martins Briedis ◽

Silke Bauer ◽

Peter Adamík ◽

José A. Alves ◽

Joana S. Costa ◽

...

Keyword(s):

Annual Cycle ◽

Migratory Birds ◽

Long Distance ◽

Breeding Sites ◽

Arrival Times ◽

Migration Timing ◽

Female Migration ◽

Proximate Determinants ◽

Carry Over ◽

And Migration

In many taxa, the most common form of sex-biased migration timing is protandry—the earlier arrival of males at breeding areas. Here we test this concept across the annual cycle of long-distance migratory birds. Using more than 350 migration tracks of small-bodied trans-Saharan migrants, we quantify differences in male and female migration schedules and test for proximate determinants of sex-specific timing. In autumn, males started migration about 2 days earlier, but this difference did not carry over to arrival at the non-breeding sites. In spring, males on average departed from the African non-breeding sites about 3 days earlier and reached breeding sitesca4 days ahead of females. A cross-species comparison revealed large variation in the level of protandry and protogyny across the annual cycle. While we found tight links between individual timing of departure and arrival within each migration season, only for males the timing of spring migration was linked to the timing of previous autumn migration. In conclusion, our results demonstrate that protandry is not exclusively a reproductive strategy but rather occurs year-round and the two main proximate determinants for the magnitude of sex-biased arrival times in autumn and spring are sex-specific differences in departure timing and migration duration.

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