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Comprehensive estimation of spatial and temporal migratory connectivity across the annual cycle to direct conservation efforts

Knight Elly C., Harrison Autumn‐Lynn, Scarpignato Amy L., Van Wilgenburg Steven L., Bayne Erin M., Ng Janet W., Angell Emily, Bowman R., Brigham R. Mark, Drolet Bruno, Easton Wendy E., Forrester Timothy R., Foster Jeffrey T., Haché Samuel, Hannah Kevin C., Hick Kristina G., Ibarzabal Jacques, Imlay Tara L., Mackenzie Stuart A., Marsh Alan, McGuire Liam P., Newberry Gretchen N., Newstead David, Sidler Andrea, Sinclair Pam H., Stephens Jaime L., Swanson David L., Tremblay Junior A. et Marra Peter P.. (2021). Comprehensive estimation of spatial and temporal migratory connectivity across the annual cycle to direct conservation efforts. Ecography, 44, (5), p. 665-679.

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URL officielle: http://dx.doi.org/doi:10.1111/ecog.05111

Résumé

Migratory connectivity is the degree to which populations are linked in space and time across the annual cycle. Low connectivity indicates mixing of populations while high connectivity indicates population separation in space or time. High migratory connectivity makes individual populations susceptible to local environmental conditions; therefore, evaluating migratory connectivity continuously across a species range is important for understanding differential population trends and revealing places and times contributing to these differences. The common nighthawk Chordeiles minor is a widespread, declining, long‐distance migratory bird. Variable population trends across the nighthawk breeding range suggest that knowledge of migratory connectivity is needed to direct conservation. We used GPS tags to track 52 individuals from 12 breeding populations. We estimated migratory connectivity as 0.29 (Mantel coefficient: 0 = no connectivity, 1 = full connectivity) between the breeding and wintering grounds. We then estimated migratory connectivity at every latitude (spatial connectivity) or day (temporal connectivity) of migration and smoothed those migratory connectivity estimates to produce continuous migratory connectivity ‘profiles'. Spatial and temporal connectivity were highest during migration through North America (around 0.3–0.6), with values generally around 0 in Central and South America due to mixing of populations along a common migratory route and similar migration timing across populations. We found local peaks in spatial and temporal connectivity during migration associated with crossing the Gulf of Mexico. We used simulations to estimate the probability that our method missed peaks (spatial: 0.12, temporal: 0.18) or detected false peaks (spatial: 0.11, temporal: 0.37) due to data gaps and showed that our approach remains useful even for sparse and/or sporadic location data. Our study presents a generalizable approach to evaluating migratory connectivity across the full annual cycle that can be used to focus migratory bird conservation towards places and times of the annual cycle where populations are more likely to be limited.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0906-7590
Volume:44
Numéro:5
Pages:p. 665-679
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.1111/ecog.05111
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Aerial insectivore, full annual cycle, migration, migratory connectivity, movement, population trend
Déposé le:19 mai 2021 17:59
Dernière modification:19 mai 2021 17:59
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