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Wind Cave National Park
Abstract - Maternal Investment in Sons and Daughters: Problems of Methodology
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Green, Wendy C.H. and Berger, Joel. 1990. Maternal investment in sons and daughters: problems of methodology. Behavioral Ecology and Sociobiology 27. pp. 99-102.
Abstract
The prediction that mothers should invest more in sons than daughters was briefly examined in American bison (Bison bison) by Wolff (1988). He concluded that (a) male calves suckle more than females, (b) cows that had previously produced sons were more likely to be baren, and (c) cows that had male calves became estrous later in the year than other cows. In this paper we present data from two long term studies at different sites to show that Wolff's conclusions are equivocal at best and difficult to reconcile with predictions of the hypothesis because of questionable methods and assumptions.
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Did You Know?
Lewis and Clark, while on their journey up the Missouri River in 1804, noted that this "wild dog of the prairie...appears here in infinite numbers."
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Last Updated: April 21, 2007 at 16:55 EST |