Cooperative and Communal Breeding

Riehl, Christina

doi:10.1007/978-3-030-14280-3_3

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…We collected data during the breeding season (June—August) of each year, when groups defend nest sites from other groups and unaffiliated birds, and only group members chorus together (Riehl & Jara, 2009; Strong et al, 2017). During the nonbreeding season, groups tend to remain near their breeding territories, but will frequently forage with other groups and typically congregate in large communal roosts (up to 150 birds) at night (Riehl, 2019). Chorusing often occurs within these communal roosts and aggregated foraging flocks, too, but because the social contexts for these vocalizations differ considerably, they likely serve slightly different functions during the nonbreeding season (e.g.…”

Section: Methodsmentioning

confidence: 99%

Group chorusing as an intragroup signal in the greater ani, a communally breeding bird

Savagian

Riehl

2022

Ethology

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Cooperative groups of animals across a wide range of taxa produce coordinated collective signals, in which the contributions of multiple signalers combine into a single vocal phenomenon, perceived at the group level (Brumm & Slater, 2007). Pair-living species produce duets, while group-living species produce larger choruses, which may involve only some or all group members (McIntyre et al., 2017;Tobias et al., 2016;Van Belle et al., 2014). The combination of multiple component voices into a collective signal, which may have properties and structures unique from its constituent parts, offers an important window into the interactions and relationships among

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Section: Methodsmentioning

confidence: 99%

Group chorusing as an intragroup signal in the greater ani, a communally breeding bird

Savagian

Riehl

2022

Ethology

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“…By contrast, unrelated helpers may be either one‐year‐olds who have dispersed from their own natal nest, or older, unpaired birds who have previously nested in another group. These immigrants gain no indirect fitness from helping to rear the brood, but they have been recorded to breed with the group in subsequent years (Riehl, 2019). Unrelated immigrants may therefore be seeking a position in a breeding group, providing help in order to be tolerated by the current group members (consistent with the “pay‐to‐stay” hypothesis, Gaston, 1978; although other explanations are also possible, e.g., Kingma et al., 2011).…”

Section: Alternative Reproductive Tactics In the Greater Animentioning

confidence: 99%

“…Is helping also a route to group membership? As in many traditional “cooperative” breeders, greater ani helpers can be either non‐dispersed offspring or unrelated immigrants (Riehl, 2019). Estimates of lifetime reproductive success are lacking for either strategy, but related and unrelated helpers clearly derive different fitness benefits from helping.…”

Section: Alternative Reproductive Tactics In the Greater Animentioning

confidence: 99%

Evolutionary origins of cooperative and communal breeding: Lessons from the crotophagine cuckoos

Riehl

2021

Ethology

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Cooperatively breeding animals live in social groups in which some individuals help to raise the offspring of others. In many species, cooperative breeding occurs in family groups in which a single breeding pair is assisted by one or more non-reproductive "helpers," who are typically related to the brood that they help to rear (Koenig & Dickinson, 2004;Skutch, 1935). In other species, several adults contribute offspring to a shared brood and cooperatively provide parental care (typically referred to as "communal" breeders to distinguish them from cooperative species with non-reproductive

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Inter‐group conflict in a cooperatively breeding bird: New insights into “home field advantage”

et al. 2020

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Conflicts between groups of animals have individual‐level fitness consequences that can influence the evolution of social behaviour. In the cooperatively breeding greater ani (Crotophaga major), groups occasionally destroy the eggs of their neighbours, causing the attacked group to abandon their nest. Prior research suggested that such conflicts occur when two groups build nests in close proximity, and that established groups tend to evict newcomers. However, inter‐group conflict had never been directly observed. Here, we report the first photographic evidence of egg destruction by greater anis. Twelve artificial nests containing clay eggs were placed in the field with the intent of attracting nest predators. Camera footage revealed that although only two nests were discovered by heterospecific predators (white‐faced capuchins, Cebus capucinus), five nests were visited by resident anis, who in three cases damaged the clay eggs by grasping them with their bills and ejecting them from the nest cup. Nests were discovered between 2 and 96 hr after being placed in the field (mean = 34 hr) and were visited up to 18 times by up to 4 individuals simultaneously. The distance between artificial nests and the nearest known ani territory ranged from 0.13 to 0.28 km (mean = 0.2 km). Resident groups did not subsequently breed at the nest sites that they attacked, consistent with the hypothesis that the main benefit of inter‐group conflict is to reduce competition for local resources rather than to usurp nest sites. This accidental experiment reveals that greater anis closely monitor nesting activity near their territories, which may contribute to the strong “home field advantage” that resident groups hold over intruders.

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Cooperative and Communal Breeding

Cited by 3 publications

References 39 publications

Group chorusing as an intragroup signal in the greater ani, a communally breeding bird

Group chorusing as an intragroup signal in the greater ani, a communally breeding bird

Evolutionary origins of cooperative and communal breeding: Lessons from the crotophagine cuckoos

Inter‐group conflict in a cooperatively breeding bird: New insights into “home field advantage”

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