Sex-biased hatching sequences in the cooperatively breeding Noisy Miner

Arnold, K. E., Griffith, S. C. and Goldizen, A. W. (2001) Sex-biased hatching sequences in the cooperatively breeding Noisy Miner. Journal of Avian Biology, 32 3: 219-223. doi:10.1111/j.0908-8857.2001.320303.x


Author Arnold, K. E.
Griffith, S. C.
Goldizen, A. W.
Title Sex-biased hatching sequences in the cooperatively breeding Noisy Miner
Journal name Journal of Avian Biology   Check publisher's open access policy
ISSN 0908-8857
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1111/j.0908-8857.2001.320303.x
Volume 32
Issue 3
Start page 219
End page 223
Total pages 5
Editor T. Alerstram
Place of publication Copenhagen
Publisher Munksgaard International Publishers
Language eng
Subject C1
270707 Sociobiology and Behavioural Ecology
Abstract The Noisy Miner Manorina melanocephala (Meliphagidae) is a cooperatively breeding bird species in which sons often remain on their natal home ranges and help one or both of their parents. In a population of Noisy Miners in SE Queensland, Australia, a molecular technique was used to explore adult and offspring sex ratios. and also hatching sequences. Among the adult population, there were 2.31 males for every female, and roughly 99% of helping was performed by males. At hatching and fledging, the population sex ratio was even, with exactly 57 males and 57 females. However, in 17 out of 18 broods the first egg to hatch was male, First-hatched males were significantly larger and heavier than their sisters just prior to fledging. Through their helping behaviour, large healthy sons could clearly enhance the future reproductive success of parents. and benefit the entire group. Sex-biased hatching sequences could potentially provide cooperatively breeding birds with a subtle and precise way of varying investment in the helping sex.
Keyword Ornithology
Ratio Selection
Manorina-melanocephala
Repayment Model
Nest
Allocation
Helpers
Birds
Eggs
Size
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Wed, 15 Aug 2007, 01:42:50 EST