Equitable chick survival in three species of the non-migratory shorebird despite species-specific sexual dimorphism of the young

Lees, Daniel Terry, Schmidt, Tom, Sherman, Craig DH, Maguire, Grainne S, Dann, Peter and Weston, Michael A 2019, Equitable chick survival in three species of the non-migratory shorebird despite species-specific sexual dimorphism of the young, Animals, vol. 9, no. 5, pp. 1-15, doi: 10.3390/ani9050271.

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Title Equitable chick survival in three species of the non-migratory shorebird despite species-specific sexual dimorphism of the young
Author(s) Lees, Daniel Terry
Schmidt, Tom
Sherman, Craig DHORCID iD for Sherman, Craig DH orcid.org/0000-0003-2099-0462
Maguire, Grainne S
Dann, Peter
Weston, Michael AORCID iD for Weston, Michael A orcid.org/0000-0002-8717-0410
Journal name Animals
Volume number 9
Issue number 5
Article ID 271
Start page 1
End page 15
Total pages 15
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2019-05
ISSN 2076-2615
Keyword(s) Lapwing
Plover
Precocial
Survival
Growth
Sex-ratio
Science & Technology
Life Sciences & Biomedicine
Agriculture, Dairy & Animal Science
Veterinary Sciences
Agriculture
Summary Sex-biases in populations can have important implications for species’ social biology, population demography and mating systems. It has recently been suggested that in some shorebirds, sex-specific bias in survival of precocial young may occur. This may be driven by variation in the brood sex-ratio and/or the sexual size dimorphism of young birds, which may influence predator escape capacity. Understanding the survival of young birds remains a significant knowledge gap for many taxa, especially when young birds are mobile and cryptic. Our aims were to estimate the sex-ratio variation in three species of Australian resident shorebird, specifically to determine: (1) whether seasonal brood sex-ratio variation at hatching is occurring, (2) the extent of any sex-biased chick survival, (3) if sex specific dimorphism at hatching or during growth occurs; and, (4) whether escape capacity differs between the sexes. We radio-tracked 50 Masked Lapwing Vanellus miles, 42 Red-capped Plover Charadrius ruficapillus and 27 Hooded Plover Thinornis cucullatus chicks from individual broods, examined the likelihood of hatchlings being male or female based on the hatching date within the breeding season, and compared size at hatching, growth and mortality of chicks of different sexes. There was no sex-bias with the hatching date across the breeding season, nor were there differences in survival or growth rates between sexes for any of the three species studied. In one species, male hatchlings had longer tarsi than females, but this did not result in differential escape propensity or improved survival. In conclusion, the hatching date, survival and growth of chicks from three species of resident shorebird was not influenced by their sex.
Language eng
DOI 10.3390/ani9050271
Indigenous content off
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2019, the authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30123758

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