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Titolo:
TESTES WEIGHT, BODY-WEIGHT AND MATING SYSTEMS IN MARSUPIALS AND MONOTREMES
Autore:
ROSE RW; NEVISON CM; DIXSON AF;
Indirizzi:
UNIV TASMANIA,DEPT ZOOL HOBART TAS 7001 AUSTRALIA UNIV CAMBRIDGE,SUBDEPT ANIM BEHAV,MRC,GRP DEV & INTEGRAT BEHAV CAMBRIDGE CB3 8AA ENGLAND
Titolo Testata:
Journal of zoology
, volume: 243, anno: 1997,
parte:, 3
pagine: 523 - 531
SICI:
0952-8369(1997)243:<523:TWBAMS>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACROPUS-RUFOGRISEUS-BANKSIANUS; SPERM COMPETITION; REPRODUCTIVE-BIOLOGY; SIZE; PRIMATES; SPERMATOZOA; EVOLUTION; BIRDS; CLUE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R.W. Rose et al., "TESTES WEIGHT, BODY-WEIGHT AND MATING SYSTEMS IN MARSUPIALS AND MONOTREMES", Journal of zoology, 243, 1997, pp. 523-531

Abstract

Relationships between testes weight, body weight and mating systems were examined in 40 marsupial species and in the extant monotremes. Relationships between relative testes weight and mating systems in marsupials resemble those previously described for primates. Thus relative testes weights are greatest in those marsupials where females mate withmultiple males during the fertile period, i.e. polyandrous species (e.g. Antechinus flavipes, Isoodon obesulus, Perameles nasuta, Potorous tridactylus, Macropus eugenii and M. agilis) and smallest in monandrous forms (e.g. Petauroides volans and Petaurus breviceps) where femalesusually mate with a single male. These findings are consistent with effects of sperm competition upon the evolution of relative testes sizes in marsupials. Where field studies on marsupial mating systems are lacking, we make predictions based upon examination of their relative testes weights. Tarsipes rostratus, Acrobates pygmaeus, Macropus rufogriseus and Sarcophilus harrisii are predicted to engage in multiple matings and sperm competition. Conversely, Lasiorhinus latifrons, Cercatetus concinnus and Pseudoantechinus macdonnellensis are predicted to bemonandrous in their mating behaviour. The monotremes (Ornithorhynchusanatinus, Tachyglossus aculeatus and Zaglossus bruijnii) are characterized by possession of very large testes; monotremes are shown to havesignificantly greater relative testes weights than marsupials, primates or avian species. This taxonomic difference is unlikely to be related to the occurrence of oviparity or to the abdominal position of the testes in the Monotremata. Their mating systems are not known in detail, but some evidence for multiple matings (and hence for sperm competition) exists for Tachyglossus aculeatus so that their large testes maybe adaptive in this context.

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Documento generato il 07/07/20 alle ore 21:38:37