A FACTOR ANALYSIS OF SEASONAL, BEHAVIORAL, HORMONAL AND BODY WEIGHT CHANGES IN ADULT MALE BARHEADED GEESE, ANSER INDICUS by JOHN P. DITTAMI and HEINZ-ULLRICH REYER (Max-Planck-Institut für Verhaltensphysiologie, Seewiesen and Andechs, F.R.G.) (With 3 Figures) (Acc. 28-XII-1983) Correlations between the circulating levels of hormones and the frequen- cies of behavior have been used to study behavioral hormonal inter- actions by a number of authors with both positive and negative results (BALTHAZART, 1976; BALTHAZART & HENDRICK, 1976; GORMAN, 1977; H?,RDING & FEDER, 1976; LESHNER, 1978, for a review; PRÖVE, 1978; TSUTSUI & ISHII, 1981). One of the most important aspects of these experiments is that they produce a framework within which many other experiments manipulating the peripheral levels of hormones and behavior can be interpreted. In this paper, results of a previous study on adult male barheaded geese (DITTAMI, 1981) have been taken and subjected to statistical analysis to determine if the circulating levels of various hormones and the frequencies of behavior were related on an annual or seasonal basis. The calculations of correlation coefficients were augmented by a factor analysis to reduce several mutually dependent correlations to a small number of independent factors. This method also allows one
Behaviour – Brill
Published: Jan 1, 1984
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