Sperm competition in the Macropodoidea: a review of evidence

Paplinska, J. Z., Bencini, R., Fisher, D. O., Newell, G. R., Goldizen, A. W., Hazlitt, S. L., Sigg, D. P., Finlayson, G. R., Munn, A. J., Chambers, B. K. and Taggart, D. A. (2010). Sperm competition in the Macropodoidea: a review of evidence. In: Coulson, G and Eldridge, M, Symposium on Macropods, Melbourne Australia, (65-76). Jul 06-07, 2006.

Author Paplinska, J. Z.
Bencini, R.
Fisher, D. O.
Newell, G. R.
Goldizen, A. W.
Hazlitt, S. L.
Sigg, D. P.
Finlayson, G. R.
Munn, A. J.
Chambers, B. K.
Taggart, D. A.
Title of paper Sperm competition in the Macropodoidea: a review of evidence
Conference name Symposium on Macropods
Conference location Melbourne Australia
Conference dates Jul 06-07, 2006
Journal name Macropods: the Biology of Kangaroos, Wallabies and Rat-Kangaroos
Place of Publication COLLINGWOOD
Publication Year 2010
Year available 2010
Sub-type Fully published paper
Open Access Status Not yet assessed
ISBN 978-0-643-09818-3
Editor Coulson, G
Eldridge, M
Start page 65
End page 76
Total pages 12
Language eng
Abstract/Summary This chapter reviews the evidence for sperm competition in the marsupial superfamily Macropodoidea. The opportunity for sperm competition arises when a female is mated by more than one male during a single oestrous period. Previous studies suggest that the male that inseminates the female with the greatest number of sperm, or the highest-quality sperm, will have the highest probability of successfully fertilising the female's egg(s). If sperm competition is operating, selection should favour males with larger testes that produce more sperm, or males capable of producing higher-quality sperm. In a 'raffle' system, in which sperm numbers are crucial to success, males of species with polyandrous mating systems are expected to have larger testes relative to their body weight than males of species with monandrous mating systems. This relationship holds true for many taxa including marsupials. Hence, testes: body weight ratios have been used in conjunction with other morphological and behavioural data to predict the likelihood of sperm competition and the possible mating system. We have assembled testis data from numerous studies, both published and unpublished, resulting in testis weights for 17 species in eight genera, and data on scrotum width for 17 species in eight genera. The literature has been examined for information about the mating system and other correlates of sperm competition to determine if the expected relationships between testis weight, body weight and mating system hold true within the Macropodoidea. The paucity of data about mating systems, especially with respect to the degree of polyandry in females, prevents us from clearly stating that there is a positive relationship between the degree of polyandry and testis weight although none of our data contradict this relationship. There is some indication that seasonal breeding may increase the probability of sperm competition.
Keyword Extra-Pair Paternity
Bridled Nailtail Wallabies
Male Reproductive Success
Mating System
Tammar Wallabies
Testis Size
Independent Contrasts
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Sub-type: Macropods: the Biology of Kangaroos, Wallabies and Rat-Kangaroos
Collection: Out of circulation - suspected duplicate records
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Created: Sun, 12 Nov 2017, 13:12:03 EST