The Contents of Maternal Testosterone in House Sparrow Passer domesticusEggs Vary with Breeding Conditions

  title={The Contents of Maternal Testosterone in House Sparrow Passer domesticusEggs Vary with Breeding Conditions},
  author={Hubert Schwabl},
  • H. Schwabl
  • Published 1 September 1997
  • Biology
  • Naturwissenschaften
1. Smith, B.D.: The Emergence of Agriculture. New York: Scientific American Library 1995 2. Gibson, A., Woods, A.: Prehistoric Pottery for the Archaeologist. Leicester: Leicester University Press, 1990 3. Rice, P.: Pottery Analysis: A Sourcebook. Chicago: University of Chicago Press 1987 4. Evershed, R.P.: World Archaeol. 25, 74–93 (1993) 5. Heron, C., Evershed, R.P.: Archaeological Method and Theory, Vol. 5. Tucson: Arizona Press 1993 6. Passi, S., Rothschild-Boros, M.C., Fasella, P., Nazarro… 
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Rises in egg androgens between early and late eggs within clutches could reflect a mechanism to assist nestlings from late-laid eggs that hatch one to several days after their siblings to better compete for resources within the nest or promote survival in the presence of larger siblings.
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  • Behav.20, 313
  • 1986
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
  • Behav.43, 361
  • 1992
  • Behav. 60, 589
  • 1996
  • Natl. Acad. Sci. USA 90, 11466
  • 1993
Perspectives in Avian Endocrinology (S
  • Harvey, R. Etches, eds.). J. Endocrinol
  • 1997
  • Behav.18, 101
  • 1984
  • Biophys. Res. Comm. 162, 1167
  • 1989
  • Behav.20, 294
  • 1986
  • Comp. Endocrinol.69, 99
  • 1988