Trends in volume migration chronology in spring staging Pacific black brant

Smith, Barry D.; Hagmeier, Katherine R.; Boyd, W. Sean; Dawe, Neil K.; Martin, Terri D.; Monty, Guy L.

doi:10.1002/jwmg.307

Cited by 2 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study indicates that earlier departure was associated with warmer and earlier springs, a pattern confirmed by Smith et al (2012) who demonstrated advancing migration among Pacific black brant Branta bernicla nigricans in Canada. The lag in response of departure date of lightbellied brent geese necessary to keep up with an earlier Arctic spring might, therefore, above all be due to the absence of a clear warming trend in their spring staging areas.…”

Section: Timing Of Migrationsupporting

confidence: 82%

Earlier Arctic springs cause phenological mismatch in long-distance migrants

Clausen

2013

Oecologia

View full text Add to dashboard Cite

An uneven change in climate across the Northern Hemisphere might severely affect the phenology of migrating animals, and especially long-distance migrating birds relying on local climatic cues to regulate the timing of migration. We examine the forward displacement of spring in both staging areas and breeding grounds of one such population, the East Atlantic light-bellied brent goose Branta bernicla hrota, and evaluate to what extent their migration has made a proportional response. On the breeding grounds in Svalbard the onset of spring advanced 2 weeks during the 24-year period, whereas no significant trend was found in the temperate staging areas. The timing of migration was constant throughout the study period, mirroring the static climatic conditions in the spring staging areas. These findings indicate a global warming-induced phenological mismatch in light-bellied brent geese, as these might arrive on their breeding grounds well beyond optimal breeding conditions. Our data indicated that productivity was negatively influenced by phenological delay and positively influenced by prolonged snow cover. We argue that both these effects might be representative of a negative influence of the growing phenological mismatch, because years with later thaw might partly offset the effects of increasingly earlier Svalbard springs. During the study period reproduction fell below annual mortality, and the population declined in recent years. The wider implications of these findings may extend to many migrating species, and highlight the urgent need to clarify how global change may influence cues and the associated timing of important life history activities.

show abstract

Section: Timing Of Migrationsupporting

confidence: 82%

Earlier Arctic springs cause phenological mismatch in long-distance migrants

Clausen

2013

Oecologia

View full text Add to dashboard Cite

show abstract

“…For example, Bahia San Quintin, Mexico, a previously high‐quality habitat for brant, based on the breeding probability of birds wintering there (Sedinger et al ), experienced long‐term declines in eelgrass abundance (Ward et al ). Additionally, stopover times of brant at Vancouver Island, British Columbia, have declined, which could indicate reduced profitability of this site resulting from reduced forage or increased disturbance from humans and bald eagles ( Haliaeetus leucocephalus ; Smith et al ). Black brant are one of the few nearctic goose species that rarely forage in agricultural fields, and are especially vulnerable to degradation of wintering and migration embayments (Cottam et al , Ward et al ).…”

Section: Discussionmentioning

confidence: 99%

“…We made observations at Bahia San Quintin during winters 1991–1993, 1997–2006, and 2011–2013 and at Lagunas Ojo de Liebre and San Ignacio, during winters 1999–2001 (Ward et al , Lindberg et al , Sedinger et al ). From spring 1991–2015, we recorded resights of brant at wintering and migration areas in southeastern Vancouver Island and Boundary Bay, British Columbia, Canada (Reed et al, ,; Smith et al ). We also periodically collected live resights of brant during migration and wintering at Izembek Lagoon, Alaska (Ward et al , ); Humboldt (Lee et al ) and Morro (Lindberg et al ) bays, California; and Puget Sound, Washington, USA (Fig.…”

Section: Study Areamentioning

confidence: 99%

Declining survival of black brant from subarctic and arctic breeding areas

et al. 2017

Self Cite

View full text Add to dashboard Cite

Since the mid 1990s, the number of black brant (Branta bernicla nigricans; brant) nests on the Yukon-Kuskokwim Delta (YKD), Alaska, USA, the historically predominant breeding area of brant, has declined steadily. This has caused researchers and managers to question if arctic breeding populations can compensate for the reduction in brant nests on the YKD. An important component of the assessment of brant population dynamics is having current estimates of first-year and adult survival. We banded brant at 4 locations in Arctic Alaska and western Canada, and at 1 location in the subarctic, the Tutakoke River (TR) colony on the YKD, 1990-2015. We used joint live and dead mark-recapture models to estimate first-year and adult (!1 yr old) survival of brant. We also used band recovery rates from a Brownie model to assess temporal trends in band recovery rates of adult brant. First-year survival of brant hatched at TR declined from approximately 0.60 to <0.20 and, although first-year survival generally was higher for goslings marked in the Arctic, their survival declined from approximately 0.70 in the early 1990s to 0.45 in the 2010s. Annual survival of adult females decreased from an average of 0.881 (95% CI ¼ 0.877-0.885) to 0.822 (95% CI ¼ 0.815-0.829) at TR and from 0.851 (95% CI ¼ 0.843-0.860) to 0.821 (95% CI ¼ 0.805-0.836) in the Arctic, from 1990 to 2014. Band recovery rates of adults generally were <1.25% until the last several years of study, when they reached 3.5%. Although the current harvest rates may be partially additive to natural mortality, we do not believe that harvest is the main influence on the declines in survival. The general decline in survival rates of brant breeding across a large geographic area may be influenced by a reduction in the quality of migration and wintering ground habitats. We suggest an analysis of seasonal survival of brant to test the hypothesis that declining habitat quality on wintering or spring migration areas is reducing survival. Our results suggest that the number of breeding pairs at TR will continue to decline and also brings into question the ability of arctic breeding populations to grow at a rate necessary to offset the declines on the YKD. Researchers should continue to closely monitor survival and harvest rates of brant, and assess methods currently used to monitor their abundance. Ó 2017 The Wildlife Society.KEY WORDS band recovery rates, Branta bernicla nigricans, Brownie models, joint live and dead mark-recapture, population dynamics, Seber reporting rate.

show abstract

Trends in volume migration chronology in spring staging Pacific black brant

Cited by 2 publications

References 30 publications

Earlier Arctic springs cause phenological mismatch in long-distance migrants

Earlier Arctic springs cause phenological mismatch in long-distance migrants

Declining survival of black brant from subarctic and arctic breeding areas

Contact Info

Product

Resources

About