Spring Migration of Western Sandpipers along the Pacific Coast of North America: A Telemetry Study

Iverson, George C.; Warnock, Sarah E.; Butler, Robert W.; Bishop, Mary Anne; Warnock, Nils

doi:10.2307/1369502

Cited by 96 publications

(80 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LOS estimates are not available for southbound migrants on the Fraser estuary, but for northbound migrants, stopover times based on radio telemetry data show that the LOS of northbound adults is also short (1992: 3.6 days, s.e.m. = 0.66, n = 10 ( Iverson et al 1996); 1995/1996: 2.2 days, s.e.m. = 0.23, n = 25 (Warnock & Bishop 1998)).…”

Section: Resultsmentioning

confidence: 98%

Western sandpipers have altered migration tactics as peregrine falcon populations have recovered

Ydenberg

Butler

Lank

et al. 2004

Proc. R. Soc. Lond. B

Self Cite

148

171

View full text Add to dashboard Cite

The presence of top predators can affect prey behaviour, morphology and life history, and thereby can produce indirect population consequences greater and further reaching than direct depredation would have alone. Raptor species in the Americas are recovering since restrictions on the use of dichlorodiphenyltrichloroethane (DDT) and the implementation of conservation measures, in effect constituting a hemisphere-wide predator-reintroduction experiment, and profound effects on populations of their prey are to be expected. Here, we document changes in the behaviour of western sandpipers (Calidris mauri ) at migratory stopover sites over two decades. Since 1985, migratory body mass and stopover durations of western sandpipers have fallen steadily at some stopovers in the Strait of Georgia, British Columbia. Comparisons between years, sites and seasons strongly implicate increasing danger from the recovery of peregrine falcons (Falco peregrinus) as a causal factor. A decade-long ongoing steep decline in sandpiper numbers censused on our study site is explained entirely by the shortening stopover duration, rather than fewer individuals using the site. Such behavioural changes are probably general among migratory shorebird species, and may be contributing to the widespread census declines reported in North America.

show abstract

Section: Resultsmentioning

confidence: 98%

Western sandpipers have altered migration tactics as peregrine falcon populations have recovered

Ydenberg

Butler

Lank

et al. 2004

Proc. R. Soc. Lond. B

Self Cite

148

171

View full text Add to dashboard Cite

show abstract

“…During migration, these birds rest and refuel at one or more stopover sites. Little is known about the length of time that shorebirds will stay at one site (Iverson et al 1996), a parameter we refer to as stopover duration. Stopover duration has also been termed stopover, stopover length, i.e., time, period, duration of stay, length of stay, migratory pause, resting period, residency, and overlap (Kaiser 1999).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Body Condition on the Stopover Ecology of Least Sandpipers in the Lower Mississippi Alluvial Valley during Fall Migration

Lehnen¹,

Krementz²

2007

ACE

View full text Add to dashboard Cite

ABSTRACT. Many shorebirds are long-distance migrants and depend on the energy gained at stopover sites to complete migration. Competing hypotheses have described strategies used by migrating birds; the energy-selection hypothesis predicts that shorebirds attempt to maximize energy gained at stopover sites, whereas the time-selection hypothesis predicts that shorebirds attempt to minimize time spent at stopover sites. The energy-and time-selection hypotheses both predict that birds in better condition will depart sites sooner. However, numerous studies of stopover duration have found little support for this prediction, leading to the suggestion that migrating birds operate under energy and time constraints for only a small portion of the migratory season. During fall migration 2002, we tested the prediction that birds in better condition depart stopover sites sooner by examining the relationship between stopover duration and body condition for migrating Least Sandpipers (Calidris minutilla) at three stopover sites in the Lower Mississippi Alluvial Valley. We also tested the assumption made by the Lower Mississippi Alluvial Valley Migratory Bird Science Team that shorebirds stay in the Mississippi Valley for 10 d. The assumption of 10 d was used to estimate the amount of habitat required by shorebirds in the Mississippi Valley during fall migration; a period longer than 10 d would increase the estimate of the amount habitat required. We used multiple-day constancy models of apparent survival and program MARK to estimate stopover duration for 293 individually color-marked and resighted Least Sandpipers. We found that a four-day constancy interval and a site x quadratic time trend interaction term best modeled apparent survival. We found only weak support for body condition as a factor explaining length of stopover duration, which is consistent with findings from similar work. Stopover duration estimates were 4.1 d (95% CI = 2.8-6.1) for adult Least Sandpipers at Bald Knob National Wildlife Refuge, Arkansas, 6.5 d (95% CI = 4.9-8.7) for adult and 6.1 d (95% CI =4.2-9.1) for juvenile Least Sandpipers at Yazoo National Wildlife Refuge, Mississippi, and 6.9 d (95% CI = 5.5-8.7) for juvenile Least Sandpipers at Morgan Brake National Wildlife Refuge, Mississippi. Based on our estimates of stopover duration and the assumption made by the Lower Mississippi Alluvial Valley Migratory Bird Science Team, there is sufficient habitat in the lower Mississippi Valley to support shorebirds during fall migration.RÉSUMÉ. De nombreux oiseaux de rivage migrent sur de longues distances et dépendent de l'énergie accumulée aux haltes migratoires pour compléter leur migration. Il existe deux hypothèses concurrentes pour définir les stratégies utilisées par les oiseaux en migration : l'hypothèse énergétique suppose que les oiseaux tentent de maximiser leurs gains énergétiques sur les haltes migratoires, tandis que l'hypothèse temporelle avance qu'ils tentent de minimiser leur durée de séjour à ces endroits. Ces hypothèses prédisent toutes d...

show abstract

“…Northward passage of C. mauri through southwestern British Columbia, Canada, takes place between days 109 and 130, and peaks on day-of-the-year 120 (based on surveys in 7 years between 1992 and 2000; Butler personal communication; see also Butler et al 1987). Radio-tracking work shows that individuals travel rapidly from British Columbia to the Copper River Delta in Alaska (Iverson et al 1996), and movement to the breeding areas follows shortly afterward. Therefore, arrival at breeding sites probably peaks on day 125 or 130.…”

Section: Discussionmentioning

confidence: 99%

Ecological factors associated with the breeding and migratory phenology of high-latitude breeding western sandpipers

Niehaus

Ydenberg

2006

Polar Biol

View full text Add to dashboard Cite

Environmental conditions influence the breeding and migratory patterns of many avian species and may have particularly dramatic effects on longdistance migrants that breed at northern latitudes. Environment, however, is only one of the ecological variables affecting avian phenology, and recent work shows that migration tactics may be strongly affected by changes in predator populations. We used long-term data from 1978 to 2000 to examine the interactions between snowmelt in western Alaska in relation to the breeding or migration phenologies of small shorebirds and their raptor predators. Although the sandpipers' time of arrival at Alaskan breeding sites corresponded with mean snowmelt, late snowmelts did delay breeding. These delays, however, did not persist to southward migration through British Columbia, likely due to the birds' ability to compensate for variance in the length of the breeding season. Raptor phenology at an early stopover site in British Columbia was strongly related to snowmelt, so that in years of early snowmelt falcons appeared earlier during the sandpipers' southbound migration. These differential effects indicate that earlier snowmelt due to climate change may alter the ecological dynamics of the predator-prey system.

show abstract

Spring Migration of Western Sandpipers along the Pacific Coast of North America: A Telemetry Study

Cited by 96 publications

References 11 publications

Western sandpipers have altered migration tactics as peregrine falcon populations have recovered

Western sandpipers have altered migration tactics as peregrine falcon populations have recovered

The Influence of Body Condition on the Stopover Ecology of Least Sandpipers in the Lower Mississippi Alluvial Valley during Fall Migration

Ecological factors associated with the breeding and migratory phenology of high-latitude breeding western sandpipers

Contact Info

Product

Resources

About