ORCID Profile
0000-0003-2339-9889
Current Organisations
The University of Auckland
,
University College London
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Publisher: Wiley
Date: 09-04-2008
Publisher: Oxford University Press (OUP)
Date: 14-08-2007
Publisher: Oxford University Press (OUP)
Date: 2008
Publisher: Elsevier BV
Date: 2008
Publisher: The Royal Society
Date: 25-09-2007
Abstract: Group living can provide in iduals with several benefits, including cooperative vigilance and lower predation rates. In iduals in larger groups may be less vulnerable to predation due to dilution effects, efficient detection or greater ability to repel predators. In iduals in smaller groups may consequently employ alternative behavioural tactics to compensate for their greater vulnerability to predators. Here, we describe how pied babbler ( Turdoides bicolor ) fledging age varies with group size and the associated risk of nestling predation. Nestling predation is highest in smaller groups, but there is no effect of group size on fledgling predation. Consequently, small groups fledge young earlier, thereby reducing the risk of predation. However, there is a cost to this behaviour as younger fledglings are less mobile than older fledglings: they move shorter distances and are less likely to successfully reach the communal roost tree. The optimal age to fledge young appears to depend on the trade-off between reduced nestling predation and increased fledgling mobility. We suggest that such trade-offs may be common in species where group size critically affects in idual survival and reproductive success.
Publisher: Oxford University Press (OUP)
Date: 14-12-2007
Publisher: Elsevier BV
Date: 11-2007
Publisher: The Royal Society
Date: 04-12-2008
Abstract: In cooperatively breeding species, helpers can alleviate reproductive constraints by assuming the role of primary carers to first-born young, liberating breeders to invest in subsequent broods. However, evidence on how first-born young are transferred to helpers is currently lacking. We propose that breeder–offspring aggression might facilitate inter-brood ision and test this idea using data from a wild population of cooperatively breeding pied babblers ( Turdoides bicolor ). After second-brood young hatch, breeders become increasingly aggressive to first-brood fledglings and attack them when they beg for food. After an attack, fledglings reduce begging. Helpers are much less aggressive to begging fledglings and fledglings subsequently tend to target helpers, rather than breeders, when begging for food. In this way, first-born dependent young are transferred to helpers, resulting in a partitioning of tasks among breeders and helpers. Task partitioning in eusocial insects is thought to be determined by the morphological or physiological characteristics of in iduals. This complementary study suggests that flexible behavioural strategies may also result in specialized roles in cooperatively breeding vertebrates.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Nichola Raihani.