Warming winter effects, fat store accumulation and timing of spring departure of Greenland White-fronted Geese Anser albifrons flavirostris from their winter quarters

Fox, Anthony D.; Walsh, Alyn

doi:10.1007/s10750-012-1173-2

Cited by 26 publications

(31 citation statements)

References 40 publications

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“…This could indicate differences in personality or other intrinsic factors. For example, body condition is known to influence the timing of the onset of migration (Fox and Walsh , Duijns et al. ).…”

Section: Discussionmentioning

confidence: 99%

Migration triggers in a large herbivore: Galápagos giant tortoises navigating resource gradients on volcanoes

Bastille‐Rousseau

Yackulic

Gibbs

et al. 2019

Ecology

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To understand how migratory behavior evolved and to predict how migratory species will respond to global environmental change it is important to quantify the fitness consequences of intra‐ and inter‐individual variation in migratory behavior. Intra‐individual variation includes behavioral responses to changing environmental conditions and hence behavioral plasticity in the context of novel or variable conditions. Inter‐individual variation determines the degree of variation on which selection can act and the rate of evolutionary responses to changes in average and extreme environmental conditions. Here we focus on variation in the partial migratory behavior of giant Galápagos tortoises (Chelonoidis spp.) and its energetic consequences. We evaluate the extent and mechanisms by which tortoises adjust migration timing in response to varying annual environmental conditions, and integrate movement data within a bioenergetic model of tortoise migration to quantify the fitness consequences of migration timing. We find strong inter‐individual variation in the timing of migration, which was not affected by environmental conditions prevailing at the time of migration but rather by average expectations estimated from multi‐annual averaged conditions. This variation is associated with an average annual loss in efficiency of ~15% relative to optimal timing based on year‐specific conditions. These results point towards a limited ability of tortoises to adjust the timing of their migrations based on prevailing (and, by extension, future) conditions, suggesting that the adaptability of tortoise migratory behavior to changing conditions is predicated more by past “normal” conditions than responses to prevailing, changing conditions. Our work offers insights into the level of environmental‐tuning in migratory behavior and a general framework for future research across taxa.

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Section: Discussionmentioning

confidence: 99%

Migration triggers in a large herbivore: Galápagos giant tortoises navigating resource gradients on volcanoes

Bastille‐Rousseau

Yackulic

Gibbs

et al. 2019

Ecology

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“…In migratory birds, the processes involved in the 'push-pull' hypothesis can be seen during molt-migration, a phenomenon in which birds molt at a location in between their breeding and wintering range. This is where poor weather conditions causing low productivity on the breeding grounds appear to 'push' birds out, leading to a staged migration as birds are 'pulled' to areas with better productivity (Barry et al 2009;Fox and Walsh 2012). Movement of species that require resources or habitats that are especially dependent on suitable weather conditions, such as seasonal or semi-permanent water sources, may respond more to 'push' pressures by moving away from sub-optimal conditions.…”

Section: Introductionmentioning

confidence: 99%

The importance of range edges for an irruptive species during extreme weather events

et al. 2015

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Context Threats to wildlife species from extreme events, such as droughts, are predicted to increase in frequency and magnitude with climate change. Extreme events can cause mortality and community-level changes, but for some mobile species, movement away from areas affected may be a viable option. Objectives We examined the effect of extreme weather on spatial patterns of abundance for an irruptive grassland bird species, the Dickcissel (Spiza americana). Methods We calculated route-level annual abundances and abundance anomalies from 1980 to 2012 from North American Breeding Bird Survey data, and classified the Dickcissel's range into core and edge regions using these abundances. We then compared abundances in the core and edge regions to the standardized precipitation evapotranspiration index, a measure of drought, in linear regressions. Results We found that Dickcissel irruptions in the northern range edges were related to drought conditions in the range core, potentially a consequence of birds being 'pushed' to the range edge when weather was unsuitable. Specifically, Dickcissels moved into refuge sites containing a high proportion of cultivated crops, with higher vegetation greenness, than those areas they leave during drought years. Conclusions In a changing climate where more frequent extreme weather may be more common, conservation strategies for weather-sensitive species may require consideration of habitat in the edges of species' ranges, even though non-core areas may be unoccupied in 'normal' years. Our results highlight the conservation importance of range edges in providing refuge from extreme events, such as drought, and climate change.Electronic supplementary material The online version of this article (

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“…Log(L) = Log-likelihood. although some species clearly have advanced spring migration (Fox andWalsh 2012, Gunnarsson andTómasson 2010, this study).…”

Section: Have Snow Geese Shifted Their Wintering Range Northward?mentioning

confidence: 48%

“…Several avian species, including some goose species, have advanced their migratory schedules and shifted their wintering or staging areas further north in response to an advance in the onset of spring (Fox and Walsh 2012, Gunnarsson and Tó-masson 2010, Lehikoinen et al 2008, Tombre et al 2008. Historically, wintering geese were reported to be site-tenacious, but recent data have shown them to be more flexible and opportunistic, especially so for sub-adult geese, when selecting annual wintering sites (Kruckenberg and Borbach-Jaene 2004, Owen 1980, Prevett and MacInnes 1980, Raveling 1979.…”

Section: Introductionmentioning

confidence: 99%

Are Wintering Areas Shifting North? Learning from Lesser Snow Geese Banded in Southwest Louisiana

Jónsson

Afton

2015

Southeastern Naturalist

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Warming winter effects, fat store accumulation and timing of spring departure of Greenland White-fronted Geese Anser albifrons flavirostris from their winter quarters

Cited by 26 publications

References 40 publications

Migration triggers in a large herbivore: Galápagos giant tortoises navigating resource gradients on volcanoes

Migration triggers in a large herbivore: Galápagos giant tortoises navigating resource gradients on volcanoes

The importance of range edges for an irruptive species during extreme weather events

Are Wintering Areas Shifting North? Learning from Lesser Snow Geese Banded in Southwest Louisiana

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