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In Defense of the "Sexy Son" Hypothesis

The critical analyses of the "sexy son" hypothesis (Weatherhead and Robertson 1979) by Searcy and Yasukawa (1981) and Wittenberger (1981) have focused attention on some weaknesses of the model and on some gaps in knowledge about the factors which affect mate choice by females in polygynous mating systems. We accept some of their arguments as valid. Those arguments that we do not accept fall into two main areas: (1) the calculation of x and the interpretation of data used to estimate x; (2) the application of the hypothesis to red-winged blackbirds (Agelaius phoeniceus; Weatherhead and Robertson 1977a, 1977b).