Group-foraging is not associated with longevity in North American birds

Beauchamp, Guy

doi:10.1098/rsbl.2009.0691

Cited by 18 publications

(15 citation statements)

References 23 publications

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“…Zonation allows the user to customize the analysis using a species weighting scheme. All prioritization schemes 5 2010, 2030, 2060, 2090-Winter RCP 4.5 2010, 2030, 2060, 2090-Summer RCP 8.5 2010, 2030, 2060, 2090-Winter RCP 8.5 2010, 2030, 2060, 2090-Scenario 2 Summer RCP 4.5 2010, 2030, 2060, 20902010, 2030, 2060, 2090Winter RCP 4.5 2010, 2030, 2060, 20902010, 2030, 2060, 2090Summer RCP 8.5 2010, 2030, 2060, 20902010, 2030, 2060, 2090Winter RCP 8.5 2010, 2030, 2060, 20902010, 2030, 2060, 2090 Note. Summer and winter prioritizations for each representative concentration pathway (RCP) scenario were combined into one landscape ranking using the highest rank across bot...…”

Section: Landscape Prioritizationsmentioning

confidence: 99%

The future of North American grassland birds: Incorporating persistent and emergent threats into full annual cycle conservation priorities

Grand

Wilsey

et al. 2019

Conservat Sci and Prac

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North American grasslands are one of the most threatened ecosystems in the world, and grassland bird populations have experienced drastic declines over the past half century. Land‐use change is widely accepted as the most persistent threat, and climate change is expected to further compromise grassland integrity. The limited consideration of projected future threats is a significant gap in existing conservation priorities for North America's central grasslands. We identified Grassland Climate Strongholds (predicted to have high climate suitability for grassland birds both today and under 21st century climate change scenarios) and Grassland Climate and Land‐use Strongholds (predicted to have high climate and land‐use suitability for grassland birds today and under 21st century climate change scenarios). Strongholds were mainly distributed across southern Canada, the Dakotas, Montana, Wyoming, Colorado, New Mexico, the Oklahoma Panhandle, Texas, and the Chihuahuan Desert. Strongholds vulnerable to land‐use conversion included the Prairie Pothole region and surrounding areas, much of the eastern‐central Plains, the Texas Blackland Prairie, the Western Gulf Coastal Plain, and areas west of the Chihuahuan Desert. A maximum of only 9% of strongholds were protected. Strongholds are critical for full annual cycle conservation of declining grassland birds in North America and complement existing grassland priorities.

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Section: Landscape Prioritizationsmentioning

confidence: 99%

The future of North American grassland birds: Incorporating persistent and emergent threats into full annual cycle conservation priorities

Grand

Wilsey

et al. 2019

Conservat Sci and Prac

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“…We used maximum longevity as our dependent variable and 10 predictor variables. In addition to examining group size, we needed to account for additional variables that probably affect variation in longevity (Gaillard et al 1989;Blumstein & Møller 2008;Beauchamp 2010). For each species, we gathered data on: (i) median social group size, (ii) median adult body mass, (iii) median age at sexual maturity, (iv) mean monthly temperature, (v) mean monthly precipitation, (vi) mid-latitude (absolute values) of their range, (vii) mean human population density, (viii) degree of arboreality, (xi) longevity and (x) group-size sample size (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…In comparative studies, Munshi-South & Wilkinson (2006) and Beauchamp (2010) found no relationship between group size and longevity in birds. Also, Blumstein & Møller (2008) found no relationship between the degree of cooperative care and cooperative breeding and lifespan in North American birds.…”

Section: Introductionmentioning

confidence: 99%

“…Several comparative studies of different vertebrate groups have confirmed that body size and age at first reproduction are important predictors of longevity (Gaillard et al 1989), but they have also examined the potential significance of additional variables, such as arboreality in mammals (Shattuck & Williams 2010) and group size in birds (Blumstein & Møller 2008;Beauchamp 2010). Spending more time in trees and living in larger groups should lower extrinsic mortality by reducing predation risk.…”

Section: Introductionmentioning

confidence: 99%

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Is group size related to longevity in mammals?

2010

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Life-history theory predicts that reduced extrinsic risk of mortality should increase species longevity over evolutionary time. Increasing group size should reduce an individual's risk of predation, and consequently reduce its extrinsic risk of mortality. Therefore, we should expect a relationship between group size and maximum longevity across species, while controlling for well-known correlates of longevity. We tested this hypothesis using a dataset of 253 mammal species and phylogenetic comparative methods. We found that group size was a poor predictor of maximum longevity across all mammals, as well as within primates and rodents. We found a weak but significant group-size effect on artiodactyl longevity, but in a negative direction. Body mass was consistently the best predictor of maximum longevity, which may be owing to lower predation risk and/or lower basal metabolic rates for large species. Artiodactyls living in large groups may exhibit higher rates of extrinsic mortality because of being more conspicuous to predators in open habitats, resulting in shorter lifespans.

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“…Maximum longevity can only be obtained from ring recoveries or resightings of known-aged birds. As such, estimates of maximum longevity will typically increase with the number of recoveries [20,21], which should be controlled to avoid potential biases. Nevertheless, the use of maximum longevity to estimate lifespan is controversial, and other sources of bias have been discussed [22], which makes such estimates not quite as reliable as adult annual survival rate.…”

Section: Introductionmentioning

confidence: 99%

Do avian cooperative breeders live longer?

Beauchamp

2014

Proc. R. Soc. B.

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Cooperative breeding is not common in birds but intriguingly overrepresented in several families, suggesting that predisposing factors, similar ecological constraints or a combination of the two facilitate the evolution of this breeding strategy. The life-history hypothesis proposes that cooperative breeding is facilitated by high annual survival, which increases the local population and leads to a shortage of breeding opportunities. Clutch size in cooperative breeders is also expected to be smaller. An earlier comparative analysis in a small sample of birds supported the hypothesis but this conclusion has been controversial. Here, I extend the analysis to a larger, worldwide sample and take into account potential confounding factors that may affect estimates of a slow pace of life and clutch size. In a sample of 81 species pairs consisting of closely related cooperative and non-cooperative breeders, I did not find an association between maximum longevity and cooperative breeding, controlling for diet, body mass and sampling effort. However, in a smaller sample of 37 pairs, adult annual survival was indeed higher in the cooperative breeders, controlling for body mass. There was no association between clutch size and cooperative breeding in a sample of 93 pairs. The results support the facilitating effect of high annual survival on the evolution of cooperative breeding in birds but the effect on clutch size remains elusive.

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Group-foraging is not associated with longevity in North American birds

Cited by 18 publications

References 23 publications

The future of North American grassland birds: Incorporating persistent and emergent threats into full annual cycle conservation priorities

The future of North American grassland birds: Incorporating persistent and emergent threats into full annual cycle conservation priorities

Is group size related to longevity in mammals?

Do avian cooperative breeders live longer?

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