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2015 ; 10
(7
): e0130657
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English Wikipedia
The Role of Bioacoustic Signals in Koala Sexual Selection: Insights from Seasonal
Patterns of Associations Revealed with GPS-Proximity Units
#MMPMID26154295
Ellis W
; FitzGibbon S
; Pye G
; Whipple B
; Barth B
; Johnston S
; Seddon J
; Melzer A
; Higgins D
; Bercovitch F
PLoS One
2015[]; 10
(7
): e0130657
PMID26154295
show ga
Despite being a charismatic and well-known species, the social system of the
koala (Phascolarctos cinereus--the only extant member of the family
Phascolarctidae) is poorly known and much of the koala's sociality and mating
behaviors remain un-quantified. We evaluated these using proximity logging-GPS
enabled tracking collars on wild koalas and discuss their implications for the
mating system of this species. The frequency and duration of male-female
encounters increased during the breeding season, with male-male encounters quite
uncommon, suggesting little direct mating competition. By comparison,
female-female interactions were very common across both seasons. Body mass of
males was not correlated with their interactions with females during the breeding
season, although male size is associated with a variety of acoustic parameters
indicating individuality. We hypothesise that vocal advertising reduces the
likelihood of male-male encounters in the breeding season while increasing the
rate of male-female encounters. We suggest that male mating-season bellows
function to reduce physical confrontations with other males allowing them to
space themselves apart, while, at the same time, attracting females. We conclude
that indirect male-male competition, female mate choice, and possibly female
competition, mediate sexual selection in koalas.
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