Group size and composition influence collective movement in a highly social terrestrial bird

Papageorgiou, Danai; Farine, Dan

doi:10.7554/elife.59902

Cited by 52 publications

(53 citation statements)

References 54 publications

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“…In addition to intensi ed competition for resource with increased densities, social interactions such as increased aggression may affect bird movement and spacing behavior. Papageorgiou and Farine (2020) have found that social group size reduced home ranges of vulturine guineafowl (Acryllium vulturinum) when group size exceeded a threshold [77]. We found that home range size and hourly movement distance decreased with increasing AWPE relative abundance.…”

Section: Discussionsupporting

confidence: 50%

Differential migratory movements of geographically distinct wintering populations of a soaring bird

Ogawa

Wang

et al. 2021

Preprint

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Background: Migratory soaring birds exhibit spatiotemporal variation in their circannual movements. We hypothesized that the circadian and seasonal movements of soaring migrants may depend primarily on exogenous factors such as thermals and wind conditions. Nevertheless, it remains uncertain how different winter environments affect the circannual movement patterns of migratory soaring birds. Here, we investigated annual movement strategies of American white pelicans Pelecanus erythrorhynchos (hereafter, AWPE) from two geographically distinct wintering grounds in the Southern and Northern Gulf of Mexico (GOM). Methods: We calculated average and maximum hourly movement distances and seasonal home ranges of GPS-tracking AWPEs. We then evaluated the effects of circadian hours, seasons, two wintering regions in the Southern and Northern GOM, human footprint index, and relative AWPE abundance from Christmas Bird Count data on AWPE hourly movement distances and seasonal home ranges using linear mixed models and generalized linear mixed models. Results: American white pelicans moved at the highest speed near 1200 hours at breeding grounds and during spring and autumn migrations. Both wintering populations in the Northern and Southern GOM exhibited similar hourly movement distances and seasonal home ranges at the shared breeding grounds and during spring and autumn migrations. However, AWPEs wintering in the Southern GOM showed shorter hourly movement distances and smaller seasonal home ranges than those in the Northern GOM. Hourly movement distances and home ranges of AWPEs increased with increasing human footprint index.Conclusions: Winter hourly movements and home ranges of AWPEs differed between the Northern and Southern GOM; however, the difference in AWPE winter movements did not carry over to the shared breeding grounds during summers. Therefore, exogenous factors may be the primary drivers to shape the flying patterns of migratory soaring birds.

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Section: Discussionsupporting

confidence: 50%

Differential migratory movements of geographically distinct wintering populations of a soaring bird

Ogawa

Wang

et al. 2021

Preprint

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“…Study species: We studied two habituated social groups of individually colour-banded vulturine guineafowl living in the savannah and dry-woodland habitat surrounding Mpala Research Centre (0°17ʹN, 37°52ʹE) in Laikipia County, Kenya. These birds live in stable social groups [31,32] and frequently engage in aggressive and submissive interactions with group members that result in steep dominance hierarchies [33].…”

Section: Empirical Datamentioning

confidence: 99%

Costs dictate strategic investment in dominance interactions

Dehnen

Papageorgiou

Nyaguthii

et al. 2021

Preprint

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Dominance is important for access to resources. As dominance interactions are costly, individuals should be strategic in who they interact with. One hypothesis is that individuals should direct costly interactions towards those closest in rank, as they have most to gain--in terms of attaining or maintaining dominance--from winning such interactions. Here, we develop a novel analytical framework to test whether interactions are directed strategically in relation to rank differences, and use these to compare strategies across types of interactions that vary in cost. We show that male vulturine guineafowl (Acryllium vulturinum), a gregarious species with steep dominance hierarchies, strategically direct costly interactions towards males occupying ranks immediately below themselves in their group's hierarchy. In contrast, low-cost interactions are not directed towards closest competitors, but towards group members slightly further down the hierarchy. We then show that, as a result of the difference in strategic use of high- and low-cost interactions towards closest competitors, individuals disproportionately use highest-cost interactions--such as chases--towards males found one to three ranks below them. Our results support the hypothesis that the costs associated with different interaction types can determine their expression in social groups.

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“…However, it may also induce challenges if it limits the options available to individuals that live in cohesive groups relative to individuals that live in more open societies. For example a small patch might provide sufficient resources for an individual or a small group, but not for a larger group [26]. Addressing this gap requires a better understanding of how group behaviours change over the spectrum of conditions that each group is likely to experience.…”

Section: Introductionmentioning

confidence: 99%

Seasonality impacts collective movements in a wild group-living bird

et al. 2021

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Background A challenge faced by animals living in groups with stable long-term membership is to effectively coordinate their actions and maintain cohesion. However, as seasonal conditions alter the distribution of resources across a landscape, they can change the priority of group members and require groups to adapt and respond collectively across changing contexts. Little is known about how stable group-living animals collectively modify their movement behaviour in response to environment changes, such as those induced by seasonality. Further, it remains unclear how environment-induced changes in group-level movement behaviours might scale up to affect population-level properties, such as a population’s footprint. Methods Here we studied the collective movement of each distinct social group in a population of vulturine guineafowl (Acryllium vulturinum), a largely terrestrial and non-territorial bird. We used high-resolution GPS tracking of group members over 22 months, combined with continuous time movement models, to capture how and where groups moved under varying conditions, driven by seasonality and drought. Results Groups used larger areas, travelled longer distances, and moved to new places more often during drier seasons, causing a three-fold increase in the area used at the population level when conditions turned to drought. By contrast, groups used smaller areas with more regular movements during wetter seasons. Conclusions The consistent changes in collective outcomes we observed in response to different environments raise questions about the role of collective behaviour in facilitating, or impeding, the capacity for individuals to respond to novel environmental conditions. As droughts will be occurring more often under climate change, some group living animals may have to respond to them by expressing dramatic shifts in their regular movement patterns. These shifts can have consequences on their ranging behaviours that can scale up to alter the footprints of animal populations.

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Group size and composition influence collective movement in a highly social terrestrial bird

Cited by 52 publications

References 54 publications

Differential migratory movements of geographically distinct wintering populations of a soaring bird

Differential migratory movements of geographically distinct wintering populations of a soaring bird

Costs dictate strategic investment in dominance interactions

Seasonality impacts collective movements in a wild group-living bird

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