Testing the Behavioural Dominance and Dispersal Hypothesis in Pochard

Choudhury, Sharmila; Black, Jeffrey M.

doi:10.2307/3676546

Cited by 18 publications

(14 citation statements)

References 17 publications

(13 reference statements)

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“…Sexual size dimorphism is also likely to have implications during the non‐breeding season. For instance, the larger sex may be better able to survive on colder sites (large‐scale sexual segregation) (Choudhury and Black ; Gill et al. ; Cristol et al.…”

Section: Introductionmentioning

confidence: 99%

“…Sexual size dimorphism is also likely to have implications during the non-breeding season. For instance, the larger sex may be better able to survive on colder sites (large-scale sexual segregation) (Choudhury and Black 1991;Gill et al 1995;Cristol et al 1999), or the sexes may winter in the same location, but forage on different types or sizes of prey (small-scale sexual segregation) (Summers et al 1990;Durrell et al 1993;Temeles et al 2000;Zharikov and Skilleter 2002;Nebel and Thompson 2005). Large-scale sexual segregation may result in the sexes wintering in distinct parts of the range and experiencing different environmental conditions and migration distances, and consequently different energetic demands (Alves et al 2012a(Alves et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Sex‐biases in distribution and resource use at different spatial scales in a migratory shorebird

Alves

Gunnarsson

Potts³

et al. 2013

Ecology and Evolution

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In migratory species, sexual size dimorphism can mean differing energetic requirements for males and females. Differences in the costs of migration and in the environmental conditions occurring throughout the range may therefore result in sex-biases in distribution and resource use at different spatial scales. In order to identify the scale at which sexual segregation operates, and thus the scale at which environmental changes may have sex-biased impacts, we use range-wide tracking of individually color-ringed Icelandic black-tailed godwits (Limosa limosa islandica) to quantify sexual segregation at scales ranging from the occupation of sites throughout the non-breeding range to within-site differences in distribution and resource use. Throughout the range of this migratory shorebird, there is no evidence of large-scale sex differences in distribution during the non-breeding season. However, the sexes differ in their selection of prey types and sizes, which results in small-scale sexual segregation within estuaries. The scale of sexual segregation therefore depends on the scale of variation in resource distribution, which, in this system, is primarily within estuaries. Sexual segregation in within-site distribution and resource use means that local-scale anthropogenic impacts on estuarine benthic prey communities may disproportionately affect the sexes in these migratory shorebirds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sex‐biases in distribution and resource use at different spatial scales in a migratory shorebird

Alves

Gunnarsson

Potts³

et al. 2013

Ecology and Evolution

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“…However, most studies suggest the winter behavioural dominance of males over females (e.g. Hepp & Hair 1984, Brodsky et al 1988, which may ultimately affect access to food reserves (Alexander 1987, Choudhury & Black 1991, suggesting density-dependent access to optimal food resources would favour males, a factor thought to contribute to a skewed adult male sex bias. Nor can we find convincing arguments why male ducks should be more sensitive to other environmental factors that might enhance their representation in the hunting bag over females.…”

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confidence: 99%

Could falling female sex ratios among first‐winter northwest European duck populations contribute to skewed adult sex ratios and overall population declines?

Fox

Cristensen

2018

Ibis

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“…Thus, keeping spring migration route short at the expense of wintering in colder areas close to the wintering line would ensure quick and less energy demanding trip to the breeding grounds, whilst wintering further away from wintering line and breeding grounds might be more beneficial strategy for individual survival, but not for reproductive success (Bregnballe et al, 2006;Steffen et al, 2008). Choice between these two strategies also is known to be species-, sex-, and age-dependent and often result in segregation of different groups at different latitudes (Choundhury and Black, 1991;Rustamov and Kovshar, 2007).…”

Section: Discussionmentioning

confidence: 99%

The Cold European Winter of 2005–2006 Assisted the Spread and Persistence of H5N1 Influenza Virus in Wild Birds

et al. 2010

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In January 2006, a major cold spell affected Europe, coinciding with an increase of H5N1 influenza virus detected in wild birds, mostly dead mute swans, starting along the River Danube and the Mediterranean coast line. Subsequently H5N1 detections in wild birds were concentrated in central and western parts of Europe, reaching a peak in mid February. We tested the hypothesis that the geographic distribution of these H5N1 infections was modulated by the long-term wintering line, the 0°C isotherm marking the limit beyond which areas are largely unsuitable for wintering waterfowl. Given the particularly cold [2005][2006] European winter, we also considered the satellite-derived contemporary frost conditions. This brought us to select the long-term maximum rather than the mean January 0°C isotherm as the best approximation for the [2005][2006] wintering line. Our analysis shows that H5N1 detection sites were closer to the wintering line than would be expected by chance, even when the geographic distribution of water bird wintering sites was accounted for. We argue that partial frost conditions in water bodies are conducive to bird congregation, and this may have enhanced H5N1 transmission and local spread. Because the environmental virus load also would build up in these hot spots, H5N1 virus may have readily persisted during the spring, at least in cooler areas. We conclude that H5N1 introduction, spread, and persistence in Europe may have been enhanced by the cold 2005-2006 winter.

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Testing the Behavioural Dominance and Dispersal Hypothesis in Pochard

Cited by 18 publications

References 17 publications

Sex‐biases in distribution and resource use at different spatial scales in a migratory shorebird

Sex‐biases in distribution and resource use at different spatial scales in a migratory shorebird

Could falling female sex ratios among first‐winter northwest European duck populations contribute to skewed adult sex ratios and overall population declines?

The Cold European Winter of 2005–2006 Assisted the Spread and Persistence of H5N1 Influenza Virus in Wild Birds

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