Mating system of the cooperatively breeding noisy miner Manorina melanocephala, as revealed by DNA profiling

1995 ◽  
Vol 37 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Tarmo Põldmaa ◽  
Robert Montgomerie ◽  
Peter Boag
Behaviour ◽  
2005 ◽  
Vol 142 (11-12) ◽  
pp. 1577-1590 ◽  
Author(s):  
Kathryn E. Arnold ◽  
Ian P.F. Owens ◽  
Anne W. Goldizen

AbstractWithin cooperative societies, group members share in caring for offspring. Although division of labour among group members has been relatively well studied in insects, less is known about vertebrates. Most studies of avian helping focus solely on the extent to which helpers provision the offspring, however, helpers can participate in everything from nest building to predator defence. Bad provisioners may, for example, not be as 'uncooperative' as they appear, if they are good defenders. Thus, the distribution of helping tasks between group members should have important implications for our interpretation of group dynamics. Here, we compare two distinct forms of helping behaviour in the cooperatively breeding noisy miner (Manorina melanocephala): chick provisioning and mobbing nest predators. We show that the way in which individual helpers invest in these two helping behaviours varies enormously across individuals and among social groups. Good provisioners often contributed relatively little to mobbing and vice versa. Indeed, (18%) of helpers only mobbed, 22% just provisioned, whereas 60% of helpers performed both forms of helping. Across nests, provisioning was significantly negatively correlated with mobbing effort. We suggest that small differences in the costs or benefits of different aspects of helping (due to differences in age, relatedness or social status) have a big impact on the division of labour within a group. Consequently, social groups can be made up from individuals who often specialise in one helping behaviour, and/or helpers who perform a number of behaviours to differing degrees. Division of labour within social groups will, therefore, have important consequences for the maintenance of cooperatively breeding in vertebrates.


2001 ◽  
Vol 32 (3) ◽  
pp. 219-223 ◽  
Author(s):  
Kathryn E. Arnold ◽  
Simon C. Griffith ◽  
Anne W. Goldizen

1998 ◽  
Vol 4 (1) ◽  
pp. 55 ◽  
Author(s):  
Merilyn J. Grey ◽  
Michael F. Clarke ◽  
Richard H. Loyn

The abundance of an aggressive Australian honeyeater, the Noisy Miner Manorina melanocephala, was reduced at four small (<8 ha) Grey Box Eucalyptus microcarpa woodland remnants by experimental removal. The diversity and abundance of small insectivorous and nectarivorous birds increased at three of the four sites (relative to matching control sites) over the twelve months following the removal of the Noisy Miners. The one exception occurred at a pair of sites where eucalypts began flowering at one site and finished at the other during the Noisy Miner removal period. These results, taken together with those from three earlier experiments where the abundance of Noisy Miners was reduced in Mugga Ironbark E. Sideroxylon woodland remnants, demonstrate that Noisy Miners affect avian diversity and abundance by aggressive exclusion of other species. In five out of seven experiments, Noisy Miners did not reinvade the small woodland remnants during the ensuing twelve months. When Noisy Miner abundance was reduced, increased populations of small insectivorous and nectarivorous birds used small degraded woodland remnants. Colonizing populations of small birds have the potential to reduce insect infestations and may assist in the recovery of dieback-affected woodland remnants. Research is continuing to test this hypothesis. Reducing the abundance of Noisy Miners in remnant eucalypt woodlands may also be a useful, short-term measure, which could assist in the recovery of threatened or endangered bird species.


2020 ◽  
Author(s):  
Peter Higgins ◽  
Les Christidis ◽  
Hugh Ford

Author(s):  
Ahmad Barati ◽  
Rose L Andrew ◽  
Jamieson C Gorrell ◽  
Farzaneh Etezadifar ◽  
Paul G McDonald

2016 ◽  
Vol 22 (7) ◽  
pp. 770-782 ◽  
Author(s):  
Alessio Mortelliti ◽  
Karen Ikin ◽  
Ayesha I.T. Tulloch ◽  
Ross Cunningham ◽  
John Stein ◽  
...  

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