Anthropic and natural factors drive variation of survival in the red‐legged partridge in southern France

Souchay, Guillaume; Besnard, Aurélien; Perrot, Charlotte; Jakob, Christiane; Ponce, Françoise

doi:10.2981/wlb.00438

Cited by 5 publications

(3 citation statements)

References 54 publications

(58 reference statements)

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“…Degraded landscapes typically have low food supplies that may be a causal factor for negative population trends seen in songbirds. 12,13,15,16,43–45 Widespread loss of winter habitats suitable for juncos may be limiting population size. These challenges are amplified in boreal forest species that have become imperiled due to climate change and subsequent habitat loss.…”

Section: Discussionmentioning

confidence: 99%

“…5–8 However, these experiments have not distinguished the role of mortality on survival measurements made by resighting birds in both experimental and control groups. 9 To make this distinction, radio transmitters attached to experimental birds 10–14 were used to confirm loss due to mortality, increasing the reliability of demographic conclusions from an experimental setup featuring winter food supplementation.…”

Section: Introductionmentioning

confidence: 99%

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Radiotracking refines the role of food supplementation on overwinter survival of the Dark-eyed Junco (Junco hyemalis)

Spellmeyer

Rogers

Schneegurt

2020

Avian Biology Research

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Resource availability, particularly food, can limit the size of bird populations during the nonbreeding season. Resident and short-distance migrant birds, wintering in colder environments, should show strong effects of food limitation on winter survival. Here, we introduce a novel experiment testing for the effect of supplemental feeding on the winter survival of the Dark-eyed Junco ( Junco hyemalis), a short- to medium-distance migrant in North America. Color-ringed juncos were monitored by resighting in the winters of 2011, 2012, and 2013. Winter supplemental feeding significantly increased junco survival within winters. However, it is possible that juncos not resighted underwent within-winter dispersal rather than died. Thus, in the winter of 2014, very high frequency radio transmitters were attached to 29 juncos from unsupplemented sites to ascertain the fate of birds not resighted. We found that movement beyond the study area was minimal and most juncos maintained a discrete home range. Of the radiotagged birds, 27.5% were not resighted during observation periods, but were located and confirmed alive via radiotracking. A correction factor for within-winter dispersal was applied to previous years’ data and the effect of food supplementation remained statistically significant for two of the three winters; the trend was the same, but not statistically significant during the warmest winter. The present results contribute to a developing conceptual model of migration-specific effects of winter food limitation. Dark-eyed Juncos are an iconic backyard birdfeeder species that have shown a steady population decline for decades. Supplemental feeding during the wintering period may regularly elevate population recruitment by increasing winter survival in avian species that winter in thermally challenging environments.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiotracking refines the role of food supplementation on overwinter survival of the Dark-eyed Junco (Junco hyemalis)

Spellmeyer

Rogers

Schneegurt

2020

Avian Biology Research

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“…On both sites, captive-reared red-legged partridges are released for population reinforcement every year in July. Survival of released red-legged partridges to the following spring is lower than 0.05 (Souchay et al, 2018). Spring is also the period of capture for this study.…”

Section: Study Area Description and Populationmentioning

confidence: 92%

Use of linear features by red-legged partridges in an intensive agricultural landscape: implications for landscape management in farmland

Perrot,

Seranne,

Berceaux

et al. 2024

Peer Community Journal

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Current agricultural practices and change are the major cause of biodiversity loss. An important change associated with the intensification of agriculture in the last 50 years is the spatial homogenization of the landscape with substantial loss of such biodiversity-rich elements as seminatural linear features (hedgerows, field margins, grassy strips, etc.). In Europe, some management prescriptions serve to increase heterogeneity by the creation of these seminatural linear features which are not being used primarily for agricultural production. However, these elements are not equal in their support for biodiversity according to their structure and composition. The aim of this study is to determine the importance of landscape heterogeneity and specifically linear features on the spatial distribution of red-legged partridges, a small game species in decline in Europe. Through GPS-monitoring of adult birds, we first assess home range size throughout the year and during the breeding season, in relation to breeding status and to linear features (seminatural linear vegetation and tracks-roads for human traffic) density. Then, we focus on habitat selection during the breeding period in relation to linear features. We found that linear elements shape the use of space by red-legged partridges according to their reproductive status. Traffic routes and seminatural features structured by both herbaceous and woody cover, negatively influenced home range size. Further, breeding birds select linear elements with herbaceous cover while non-breeders select linear elements with woody cover, underlining the different needs of birds according to their breeding status. All birds selected areas near tracks, but non-breeders seemed to avoid roads. This study shows the importance for this species of the linear components that structure the agricultural landscape. We propose recommendations to promote the presence of the red-legged partridge in this agricultural environment but also of the biodiversity in general.

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Red-Legged Partridge Monitoring and Population Trends

Souchay

Aebischer

Arroyo

et al. 2022

Wildlife Research Monographs

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Anthropic and natural factors drive variation of survival in the red‐legged partridge in southern France

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 5 publications

References 54 publications

Radiotracking refines the role of food supplementation on overwinter survival of the Dark-eyed Junco (Junco hyemalis)

Radiotracking refines the role of food supplementation on overwinter survival of the Dark-eyed Junco (Junco hyemalis)

Use of linear features by red-legged partridges in an intensive agricultural landscape: implications for landscape management in farmland

Red-Legged Partridge Monitoring and Population Trends

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