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Timing of foetal growth spurts can explain sex ratio variation in polygynous mammals
Ist Teil von
Ecology letters, 2000-01, Vol.3 (1), p.1-4
Ort / Verlag
Oxford, UK: Blackwell Science Ltd
Erscheinungsjahr
2000
Link zum Volltext
Quelle
Wiley Online Library - AutoHoldings Journals
Beschreibungen/Notizen
The prediction from sex ratio theory that natural selection on sexually dimorphic mammals should favour an excess of male offspring only when mothers are in good condition, has been tested extensively but with little consistency in results. Although recent studies have shown that environmental variations may cause some of the discrepancy, there have also been reports of contrasting sex ratios under similar environmental settings. Here it is suggested that variation in timing of environmental stress and sex‐specific differences in foetal growth pattern in relation to maternal condition, may explain such seeming contradictions in sex ratio variation of polygynous mammals.