New Zealand Journal of Zoology abstracts
Social dominance and breeding success in captive brushtail possums,
Trichosurus vulpecula
S. E. JOLLY
E. B. SPURR
Manaaki Whenua
PO Box 69
Lincoln, New Zealand
P. E. COWAN*
Manaaki Whenua
Private Bag 11052
Palmerston North, New Zealand
email: cowanp@landcare.cri.nz
*Author for correspondence
Abstract The brushtail possum (Trichosurus vulpecula)
is New Zealand's most important mammal pest. Options for the biological control
of possums are being evaluated, particularly fertility control. The functions
of social dominance hierarchies in possums have not been determined, but in
many species dominant males breed more successfully than subordinates. This
paper describes the effect on breeding success in captive groups of possums of
vasectomising the dominant male. Dominance was measured by recording the
outcome of social interactions during monthly observations. In groups of two
male and two female brushtail possums, the dominant male was vasectomised (n =
7) or left untreated (n = 5). Five other groups with one male and two females
were used as additional controls. In the groups where the dominant male was
vasectomised, its dominance status remained unchanged after treatment but there
were no further births, whereas young continued to be born in pens where males
were untreated. At least in captivity, dominant males are therefore capable of
behaviourally or physiologically inhibiting reproduction by subordinate males.
This is the first evidence for such an effect in possums.
Keywords brushtail possums; Trichosurus vulpecula;
dominance; social behaviour; reproduction; fertility control
Z98007
Received 25 February 1998; accepted 10 September 1998
PDF file of entire paper: medium quality (360K); (scanned from paper original: notes about this process)
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