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Documents disponibles écrits par cet auteur (15)
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Article
Hayley A. Spina, Auteur ; Amy E. M. Newman, Auteur ; Nathaniel T. Wheelwright, Auteur ; Daniel J. Mennill, Auteur ; Stéphanie M. Doucet, Auteur ; Joseph B. Burant, Auteur ; Sarah L. Dobney, Auteur ; Sarah D. Mueller, Auteur ; Greg W. Mitchell, Auteur ; D. Ryan Norris, AuteurMany birds produce two broods each year and exhibit significant intra-population variation in the length of time between the hatching of first and second broods (the inter-brood interval). Why within-population variation in inter-brood interval [...]
Article
Richard A. Erickson, Auteur ; Jay E. Diffendorfer, Auteur ; D. Ryan Norris, Auteur ; Joanna A. Bieri, Auteur ; Julia E. Earl, Auteur ; Paula Federico, Auteur ; John M. Fryxell, Auteur ; Kevin R. Long, Auteur ; Brady J. Mattsson, Auteur ; Christine Sample, Auteur ; Ruscena Wiederholt, Auteur ; Wayne E. Thogmartin, Auteur ; Richard Fuller, Auteur
Article
Bradley K. Woodworth, Auteur ; Greg W. Mitchell, Auteur ; D. Ryan Norris, Auteur ; Charles M. Francis, Auteur ; Philip D. Taylor, AuteurDeparture decisions of songbirds at ecological barriers they encounter en route can strongly influence time, energy and survival costs of migration. To date, most field studies of departure decisions and their correlates have used indirect metho[...]
Article
Marjorie C. Sorensen, Auteur ; J. Mark Hipfner, Auteur ; T. Kurt Kyser, Auteur ; D. Ryan Norris, AuteurUnderstanding the interactions between different periods of the annual cycle in migratory animals has been constrained by our inability to track individuals across seasons. In seabirds, virtually nothing is known about how diet quality during th[...]
Article
Talia H. Sechley, Auteur ; Dan Strickland, Auteur ; D. Ryan Norris, AuteurAnimals that reside at high latitudes and altitudes year-round often use cached food to survive over the winter months, but a few species also rely on stored food to sustain them during the breeding season when the nutritional requirements of fe[...]
Article
D. Ryan Norris, Auteur ; Peter Arcese, Auteur ; David Preikshot, Auteur ; Douglas F. Bertram, Auteur ; T. Kurt Kyser, Auteur1. For the overwhelming majority of species, we lack long-term information on the dynamics of populations. As a consequence, we face considerable uncertainty about how to discriminate among competing hypotheses of population decline and design c[...]
Article
Jesus Gomez, Auteur ; Chantel I. Michelson, Auteur ; David W. Bradley, Auteur ; D. Ryan Norris, Auteur ; Lisha L. Berzins, Auteur ; Russell D. Dawson, Auteur ; Robert G. Clark, AuteurOur understanding of the annual life-cycle movements of small migratory birds has advanced rapidly with the advent of light-weight geographical positioning devices (i.e., geolocators), yet the effects of geolocators on reproduction and survival [...]
Article
Samantha E. Franks, Auteur ; David B. Lank, Auteur ; D. Ryan Norris, Auteur ; Brett K. Sandercock, Auteur ; Caz M. Taylor, Auteur ; T. Kurt Kyser, AuteurAvian age-class discrimination is typically based on the completeness of the first prebasic molt. In several calidrid sandpiper species, juvenal flight feathers grown on Arctic breeding grounds are retained through the first three migrations. Th[...]
Article
Justin Sheehy, Auteur ; Caz M. Taylor, Auteur ; D. Ryan Norris, AuteurAlthough stopover habitats are used by many species as refuelling stations during migration and can be critical for survival and successful reproduction, they are rarely incorporated in year-round population models and conservation strategies. W[...]
Article
Marjorie C. Sorensen, Auteur ; J. Mark Hipfner, Auteur ; T. Kurt Kyser, Auteur ; D. Ryan Norris, AuteurUnderstanding the mechanisms that influence variation in sexually selected ornaments in seabirds has been challenging owing to the difficulty of capturing and sampling individuals outside of the breeding period when ornaments are usually grown. [...]
Article
Lauren F. Rae, Auteur ; Greg W. Mitchell, Auteur ; Robert A. Mauck, Auteur ; Christopher G. Guglielmo, Auteur ; D. Ryan Norris, AuteurRadio telemetry can be a valuable tool for studying the behavior, physiology, and demography of birds. We tested the assumption that radio transmitters have no adverse effects on body condition in an island population of Savannah Sparrows (Passe[...]
Article
Samantha E. Franks, Auteur ; D. Ryan Norris, Auteur ; T. Kurt Kyser, Auteur ; Guillermo Fernández, Auteur ; Birgit Schwarz, Auteur ; Roberto Carmona, Auteur ; Mark A. Colwell, Auteur ; Jorge Correa Sandoval, Auteur ; Alexey Dondua, Auteur ; H. River Gates, Auteur ; Ben Haase, Auteur ; David J. Hodkinson, Auteur ; Ariam Jimenez, Auteur ; Richard B. Lanctot, Auteur ; Brent Ortego, Auteur ; Brett K. Sandercock, Auteur ; Felicia Sanders, Auteur ; John Y. Takekawa, Auteur ; Nils Warnock, Auteur ; Ron C. Ydenberg, Auteur ; David B. Lank, AuteurUnderstanding the population dynamics of migratory animals and predicting the consequences of environmental change requires knowing how populations are spatially connected between different periods of the annual cycle. We used stable isotopes to[...]
Article
Greg W. Mitchell, Auteur ; Nathaniel T. Wheelwright, Auteur ; Christopher G. Guglielmo, Auteur ; D. Ryan Norris, AuteurCosts of reproduction represent a common life-history trade-off. Critical to understanding these costs in migratory species is the ability to track individuals across successive stages of the annual cycle. We assessed the effects of total number[...]
Article
Greg W. Mitchell, Auteur ; Amy E. M. Newman, Auteur ; Martin Wikelski, Auteur ; D. Ryan Norris, Auteur1. Determining how events interact across stages of the annual cycle is critical for understanding the factors that affect individual fitness. However, there is currently little information detailing how breeding events influence migratory behav[...]
Article
D. T. Tyler Flockhart, Auteur ; Jean-Baptiste Pichancourt, Auteur ; D. Ryan Norris, Auteur ; Tara G. Martin, AuteurThreats to migratory animals can occur at multiple periods of the annual cycle that are separated by thousands of kilometres and span international borders. Populations of the iconic monarch butterfly (Danaus plexippus) of eastern North America [...]
